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Ethnobotany of wild edible plants in multiethnic areas of the Gansu–Ningxia–Inner Mongolia junction zone

Abstract

Introduction

In recent years, research on wild edible plant resources has become increasingly popular. The Hassan Nature Reserve is a multiethnic area mainly composed of people belonging to the Han, Hui, and Mongolian groups. The utilization of edible wild plant resources in this area is extremely high. However, with the advancement of urbanization and the development of modern agricultural technology, these resources have been seriously damaged, and related traditional knowledge, such as that related to national medicine, has been lost.

Methods

Based on a literature study, interviews with village and community organizations, participatory observation, and quantitative evaluation of ethnobotanical resources, wild edible plants in the Gansu–Ningxia–Inner Mongolia junction zone, were investigated.

Results

The survey results showed that there were 53 species (varieties) of wild edible plants belonging to 24 families in this area. The Compositae and Liliaceae families were the most abundant, with 8 and 7 species, respectively. The young stems and leaves were the most edible parts of the plants, as observed for 17 species, followed by fruits (including young fruits), which were considered the edible part of 16 species. Other edible parts included the roots or rhizomes (bulbs), seeds, whole plants, skins, etc. The edible plants were consumed in two forms: raw and cooked; raw plants, mainly fruit, were typically consumed as snacks. The cooked foods mainly consisted of vegetables, with tender stems and leaves as the main food source. These components were also used as seasoning, in medicinal diets, and as an emergency food source in times of famine. Important (CFSI > 500) wild edible plants used in health care in the region include Mulgedium tataricum (L.) DC., Nostoc commune Vaucher ex Bornet & Flahault, Sonchus arvensis L., Taraxacum mongolicum Hand.-Mazz., Allium schoenoprasum L., Robinia pseudoacacia L., Hemerocallis citrina Baroni, Elaeagnus angustifolia L., Medicago sativa L., Ulmus pumila L., Stachys sieboldii Miq., and Toona sinensis (Juss.) M. Roem., and these plants had high utilization values and rates locally.

Conclusion

In summary, the species of wild edible plants and their edible parts, categories, consumption forms and roles in health care in this area are diverse. The utilization of traditional knowledge is rich, and some wild plants have high development value.

Background

Wild edible plants have played a very important role in the history of human development [1], especially in times of famine. Wild edible plants provide not only life-saving foods but also life-saving medicines [2]. By providing abundant materials, wild edible plants are also an indispensable part of people's lives [3]. Because wild edible plants are derived from natural resources and play important roles in health care, they are respected in modern societies and have great market potential [4, 5]. Research on wild edible plant resources has been carried out both in China and abroad. In particular, plant resources have become a hot research topic in recent years. Many products derived from wild resource have become valued goods in the market and popular health foods [6,7,8,9,10]. Scholars in China have mainly focused on the investigation and study of rare or uncommon edible wild plant resources [11,12,13,14], and these studies have provided informational resources for the development and utilization of local wild edible plant resources.

The Hassan Nature Reserve is located in the arid area of the Loess Plateau, where Gansu, Ningxia and Inner Mongolia meet. The region is characterized by multiethnic groups, mainly composed of Han, Hui, and Mongolian people. Due to the relatively low precipitation and high evaporation in this area [15], plant resources are relatively scarce, both in the number of species and in abundance. Since ancient times, this has been a poverty-stricken area with a shortage of materials. However, exchanges and integration among the Hui, Han, and Mongolian ethnic groups, each of which has a long history with accumulated traditional experience with wild edible plants, has contributed to the extremely high degree of exploitation of the edible wild plant resources in the region. However, with the advancement of urbanization and the development of modern agricultural technology, such resources have been seriously damaged, and related traditional knowledge, such as indigenous medicine, has been lost. Therefore, this study explored, recorded, and summarized the traditional knowledge of edible wild plant resources in this area. This knowledge has been very beneficial in the protection of traditional cultures and the sustainable development and utilization of wild edible plant resources.

Methods

Study area

In this study, Jingyuan County, Pingchuan district, and Jingtai County in Baiyin city, Gansu Province (Fig. 1), with Hassan Mountain Nature Reserve as the center point, were investigated. The area spans the latitudes of 36 to 37 38' north and longitudes of 103 33' to 105 51' east. It is located in the transition zone of three major regions: the Loess Plateau in western Gansu Province, the Yanyu region of the Qilian Mountains in Shandong Province, and the Tengger Desert. It occurs in a transition zone, spanning semiarid, middle temperate, and arid zones. The annual average temperature is 6–9 °C, and the annual rainfall is 180–450 mm [16]. The area is home to multiple ethnic groups, and the main ethnic groups in the territory are the Han, Hui, and Mongolian. Additional ethnic groups in the area include the Tibetan, Manchu, and other ethnic groups [17]. The economy of the area is based on agriculture and industry, and the main crops are Triticum aestivum L., Zea mays L., Oryza sativa L., Chenopodium quinoa Willd., Solanum tuberosum L., Vicia faba L., Linum usitatissimum L., Allium cepa L., Brassica rapa L., Ziziphus jujuba Mill., Lycium chinense Mill., etc. [18,19,20]. In addition, the region is also an important post-station along the Silk Road; relying on the advantages provided by this resource, it is active in the development of characteristic industries and integrates multiple cultures, such as the Yellow River culture, the Silk Road culture, the farming culture, the folk culture, and the red culture, forming a unique local culture [21].

Fig. 1
figure 1

Survey area

Ethnobotanical information collection

During the field investigation, interviews with key individuals, semistructured interviews, and participatory rural evaluation methods were used. The basic format of the interviews followed the “5 W + 1H” structure [22] to cover the traditional knowledge of edible wild plants; in addition, basic information about the interviewee as well as the local common names, edible parts, categories, consumption methods, and health care functions of edible plants were recorded, organized, and analyzed. The participatory observation method [23] was also used to understand the types, uses, functions, edible parts, and consumption methods of wild plants collected and eaten by the local people in their daily life. Interviews were also conducted by telephone communication, and the format of these interview was the same as that of the field interviews.

Quantitative evaluation of ethnobotanical resources

The national plant cultural importance index (CFSI) was used to evaluate the wild edible plants in the investigated area.

$$\begin{aligned} {\text{CFSI}} = & {\text{FQI}} \times {\text{AI}} \times {\text{FUI}} \times {\text{PUI}} \\ \times & {\text{MFFI}} \times {\text{TSAI}} \times {\text{FMRI}} \times 10^{{ - 2}} \\ \end{aligned}$$

where FQI is the frequency index, AI is the commonness index, FUI is the frequency index, PUI is the utilization site index, MFFI is the multifunctional food utilization index, TSAI is the taste evaluation index, and FMRI is the medicinal diet function index [24].

Each index was graded and assigned a value according to the Research Methods of Ethnobotany [25]. The frequency of quotation index (FQI) is the number of people who mentioned a plant in all the informational reports. The availability index (AI) was divided into very common (4.0), common (3.0), general (2.0), and uncommon (1.0). The frequency of utilization index (FUI) was divided into more than once a week (5.0), once a week (4.0), once a month (3.0), more than once a year but less than once a month (2.0), once a year (1.0), and not used for nearly 30 years (0.5). The parts used index (PUI) was divided into whole plant (4.00), aboveground and belowground parts (3.00), tender leaves and tender stems and leaves (2.00), flowers, fruits (1.50), tender roots, stems, and stipules (1.00), and tender buds (0.75). The multifunctional food use index (MFFI) was divided into raw food and cold mix (1.5), boiling, stewing, and flavoring (1.0), special-purpose flavoring (0.75), and raw food as snack (0.50). The taste score evaluation index (TSAI) was used to classify plants as excellent (10.0), very good (9.0), good (7.5), average (6.5), poor (5.5), and very poor (4.5). The food and medicinal role index (FMRI) was divided into very high (5.0 as medicine and food), high (4.0 for treating certain diseases as medicine), medium–high (3.0 for very healthy food), medium–low (2.0 for healthy food, efficacy unknown), and unknown (1.0).

Specimen identification

The collected plants were identified to the species level by referencing the full-text electronic edition of Flora of China (http://www.iplant.cn/frps) [26], Atlas of Desert Plants in China [27], and Field Identification Manual of Common Plants in China (Qilian Mountain Volume) [28]. Various information materials were collected and analyzed for this research, and representative samples were drawn. Herbarium specimens are stored at the Life Science Museum of Zunyi Medical University (No.6 Xuefu West Road, Honghuagang district, Zunyi city, Guizhou Province, China).

The research was carried out following the code of ethics of the American Anthropological Association [29] and the International Society of Ethnobiology Code of Ethics [30]. Oral prior informed consent was acquired.

Results

Basic information from reports

The age distribution of 175 interviewees was segmented, and the results showed that all interviewees were between 18 and 85 years of age; 25 were between 18 and 25 years of age, 25 were between 25 and 30 years of age, 42 were between 30 and 35 years of age, 22 were between 36 and 45 years of age, 21 were between 46 and 55 years of age, 19 were between 56 and 65 years of age and 21 were over 65 years of age. Of those interviewed, 142 were of rural origin (i.e., they were born in rural areas and raised in rural areas during childhood and adolescence), accounting for 81.14 percent of all interviewees, and 33 were of urban origin (i.e., they were born and lived in urban areas), accounting for 18.86 percent of the total. There were 87 males and 33 females, with a male-to-female ratio close to 1:1. A total of 148 of the interviewees were of the Han nationality, 22 were of the Hui nationality, and 5 were of the Mongolian nationality (Fig. 2).

Fig. 2
figure 2

Basic information about the interviewees

The results of the survey showed that the number of species of wild plants eaten by the interviewee was positively correlated with age. Eleven wild plant species were consumed by each of the 25 reporters under 25 years of age, while up to 47 wild plant species were consumed by each of the 21 reporters over 65 years of age, 4.27 times the number of reported species consumed by respondents under 25 years of age. Most of the 11 wild plants eaten by people under the age of 25 are common wild vegetables (with tender stems and leaves), such as Sonchus wightianus DC., Mulgedium tataricum (L.) DC., Nostoc commune Vaucher ex Bornet & Flahault, Taraxacum mongolicum Hand.-Mazz., Allium mongolicum Regel, the flower of Robinia pseudoacacia L., the samara of Ulmus pumila L., and the bud of Toona sinensis (Juss.) M. Roem.. The number of species consumed by people over 65 years old was significantly higher than the number of species consumed by people in the other age groups, and the difference was mainly due to the consumption of dermatophytes and spermatophytes, such as the bark of U. pumila L., the seeds of Corispermum hyssopifolium L. and Chenopodium album L. These plants were eaten only in years with famine. With abundant material on resources and the fact that people are no longer lacking food, these plants are rarely eaten by people.

The consumption of edible wild plant species is also directly related to the growth environment of the interviewee. Individuals from rural areas consumed significantly higher numbers of edible wild plant species than individuals from urban areas. For example, among interviewees between the ages of 30 and 35, 37 wild plants had been consumed by all the interviewees from rural areas, while only 14 wild plants had been consumed by all the interviewees from urban areas. The 14 plants consumed by individuals from urban areas are also mainly wild vegetables, such as S. wightianus DC., N. commune Vaucher ex Bornet & Flahault, T. mongolicum Hand.-Mazz., A. mongolicum Regel, and the buds of T. sinensis (Juss.) M. Roem.. Furthermore, modern urban food and beverage items are often derived from the species A. mongolicum Regel, and the buds of T. sinensis (Juss.) M. Roem. have been artificially cultivated.

Sources of wild edible plants in the Hassan area

A statistical analysis was performed on wild edible plants in the Hassan region. There were 53 species (based on incomplete statistics) of wild edible plants belonging to 24 families in the Hassan region. Compositae and Liliaceae were the most prevalent families, with 8 wild edible plants belonging to Compositae and 7 wild edible plants belonging to Liliaceae, most of which were eaten as wild vegetables. The 8 wild edible plants belonging to Compositae had a relatively wide distribution range and were generally distributed throughout the investigation area; among these 8 plants, S. wightianus DC., M. tataricum (L.) DC., and T. mongolicum Hand.-Mazz. were the most common wild vegetables in the region. The distribution of edible wild plants of Liliaceae is relatively regional, and communities of this species are relatively concentrated. There were four, four, and three species of wild edible plants belonging to Solanaceae Juss., Chenopodiaceae Vent. and Rosaceae Juss., respectively. Most of the wild edible plants belonging to these three families were consumed as snacks.

Edible parts of the wild edible plants in the Hassan area

Among the 53 wild edible plants identified, the tender stems and leaves (including tender buds) were the most commonly used parts of the plants, with 17 species, followed by the fruits (including tender fruits), with 16 species. In addition, the edible plant parts included the roots or rhizomes (bulbs), seeds, and whole plants (Table 1). Plants were consumed in two forms: raw and cooked. Raw food, typically fruit, was mainly used as snacks. Cooked food mainly consisted of vegetables, and some wild edible plants have multiple edible parts or multiple forms of consumption (Fig. 3). In addition, there are plants that are mainly used as flavoring and in medicinal diets, such as Thymus quinquecostatus Celak., Cistanche deserticola Ma, and Cynomorium songaricum Rupr.. The edible parts of herbs mainly consisted of young stems and leaves, which were typically eaten as vegetables, while tall woody plants mainly provided fresh and tender fruits or mature fruit seeds, which were typically eaten as snacks. The wild edible plants whose edible parts were tender stems and leaves and tender buds were generally eaten as vegetables after being mixed with cold elements or pickled, and the fruits, roots, and rhizomes were mainly eaten fresh as snacks. The seeds and skins of fruits were typically used as an emergency resource and supplementary food in times of famine. Currently, given the abundance of resources, seeds, such as those of C. hyssopifolium L. and C. album L., are rarely eaten by people.

Table 1 Catalogue of wild edible plants in mixed area of Hui and Han in Northwest China
Fig. 3
figure 3

Steamed stuffed bun with ground ear and shallot salad

Quantitative evaluation of edible wild plants in the Hassan area

The results of the comparison of the CFSI values of wild edible plants near Mount Hassan are shown in Table 2 and Fig. 4. The edible wild plants in the region were clustered based on their CFSI values to screen out the wild edible plants that were widely used in the region (i.e., those with high values) and played an important role in the traditional diet of local people. The plants with the highest importance values (CFSI > 500) are M. tataricum (L.) DC., N. commune Vaucher ex Bornet & Flahault, S. wightianus DC., T. mongolicum Hand.-Mazz., Allium schoenoprasum L., Hemerocallis citrina Baroni, Elaeagnus angustifolia L., Medicago sativa L., U. pumila L., Stachys sieboldii Miq., and T. sinensis (Juss.) M. Roem., consisting mainly of wild vegetables. These group of wild edible plants play an important role in the lives of local people; for example, M. tataricum (L.) DC., S. wightianus DC., A. schoenoprasum L., M. sativa L., and N. commune Vaucher ex Bornet & Flahault have been used in dishes prepared by local people since ancient times. Prior to the widespread use of greenhouses, S. wightianus DC., A. schoenoprasum L., and M. sativa L. were the main vegetables consumed by local people in spring. Currently, these vegetables are the most representative wild vegetable varieties for the catering organizations in the region. The plants with the second highest importance values (500 > CFSI ≥ 100) included mainly wild vegetables and plants used as snacks, such as Z. jujuba Mill. and Hippophae rhamnoides L., and these edible wild plants also had good development value. The reason for their lower CFSI values was mainly related to their narrow distribution range and limited edible parts. Most plants with the third highest importance values (100 > CFSI ≥ 10) were consumed typically as snacks, and some of them had high medicinal value, such as C. songaricum Rupr., Isatis indigotica Fortune ex Lindl., and C. deserticola Ma. The plants with the fourth highest importance values (10 > CFSI) were mainly distributed in only certain areas or had poor taste; these plants were mostly collected and eaten in times of famine. The interviewees who reported eating these species were mainly elderly individuals, and currently the species in this group, such as C. hyssopifolium L. and Populus davidiana Dode, are rarely eaten by people.

Table 2 Quantitative evaluation index of edible wild plants in Hassan area
Fig. 4
figure 4

Heatmap of edible wild plants in the Hassan area

Discussion

The wild edible healthy plants collected in this investigation have obvious regional characteristics. Except for a few plants that are widely distributed in China and eaten as wild vegetables in most areas, such as S. wightianus DC., C. album L., and T. mongolicum Hand.-Mazz., the vast majority of plants are typical drought-tolerant plants, and C. deserticola Ma, C. songaricum Rupr., N. flagelliforme Born. et Flah., Z. fabago L., R. nanum Siev. ex Pall. are the representative plants in arid areas or desert areas. We also found that some plants were eaten and widely distributed in other areas of Gansu but were not in the investigated area; for example, Plantago asiatica L. and Urtica fissa E.Pritz. were eaten in Zhouqu, Gansu [31]. This indicated that there were differences in the understanding of wild edible healthy plant resources among regions.

Although the survey area is inhabited by multiple ethnic groups, such as the Han, Hui, and Mongolian groups, almost all ethnic groups have basically Sinicized, and no significant difference has been found in the knowledge of wild edible healthy plants among the groups. The use of local names for the collected plants makes it difficult to determine their extent nationally; however, these names often have a direct relationship with the taste, edible parts, and categories of the plants. For example, Kucai(M. tataricum (L.) DC., S. wightianus DC.), Suanliuliu(B. diaphana Maxim.), Lala(L. apetalum Willd.), Suanqiuzi(S. tuberosum L.) are named for their taste, and Youpingping(R. omeiensis Rolfe), Yangnaizi(T. pratensis L.), Huanggouluanzi(R. nanum Siev. ex Pall.) are named for their shapes. Youpingping refers to the similarity of the food resource to a bottle of oil, Yangnaizi is named for its resemblance to sheep nipples, and Huanggouluanzi is yellow and shape like a dog's testicles, while Toufacai(N. flagelliforme Born. et Flah.) is a kind of edible vegetable with an appearance like hair. Plants from a wide range of edible groups, such as vegetables, often contain “cai” (Chinese pronunciation) in their local names, which suggests that researchers have paid attention to this unique phenomenon [32]. In addition, onion and garlic are traditionally used for flavoring in China, and wild edible onion and garlic have similar functions, being used for flavoring, with the plant forms (or species) being close to the traditionally planted onions and garlic.

Knowledge about edible wild plants in the survey area gradually decreased with time (calculated based on the age of the interviewees). This result may be directly related to the social and economic development in China. In years of scarcity, wild edible plants are not only a supplement to daily food but also life-saving food and medicine in many cases. Currently, except a few wild edible plants that can be used as tonics, many of these plants, such as C. deserticola Ma, C. songaricum Rupr., and N. flagelliforme Born. et Flah., will be collected and stored for consumption in other seasons.

Another finding that needs to be explained is that there are certain kinds of mushrooms in this area (the local people refer to similar fungi collectively as mushrooms), but they are rarely eaten. The reason for their lack of consumption is that local people think that mushrooms are prone to attracting maggots, which represent unclean conditions. This may be the reason why local people seldom eat mushrooms, which differs completely from the understanding of the edibility and value of mushrooms in other areas of Gansu [33]. Of course, there have been no incidences of mushroom poisoning in this area. In addition, the residents of this area also have knowledge about other poisonous plants. The roots of Aconitum L. and the Anisodus Link et Otto are not edible. A local legend states that a shepherd and a young child died because they accidentally ate Aconitum szechenyianum Gáyer and the roots of Anisodus Link et Otto. These two plants are explicitly listed in the local list of plants not suitable for consumption, and this knowledge has been passed down from generation to generation, in contrast to the habit of eating Aconitum carmichaeli Debx. in other parts of China [34].

With the development of the economy, there has been a gradual increase in the desire for wild edible plant resources among consumers. Developing tourism is an important means of economic development in western China [35]. Wild and healthy natural vegetables have become an important publicity point for attracting tourists; this publicity causes consumers to have a “curiosity” mentality about wild edible plants, and they regard the consumption of these plants as a fashionable behavior [36]. Due to these psychological and behavioral factors, the demand for wild edible plant resources has greatly increased. However, the study region is in the arid area of the Loess Plateau in northern Gansu Province, and its ecological environment is extremely fragile. A large number of wild edible plants are collected in this area, especially wild plants with edible parts that include roots, rhizomes, and whole plants. In the investigated area, C. deserticola Ma, C. songaricum Rupr., and N. flagelliforme Born. et Flah. are often targeted for collection.

The total number of wild edible and healthy plant resources collected in the study area is small, mainly due to the low species richness in the area caused by the ecological environment. Nevertheless, the extent of exploitation of edible plants and plant resources throughout the region is actually quite high. There were no differences in the information provided by consumers from the Han, Hui, and Mongolian groups about the healthy wild edible plants collected. The species investigated included mainly herbaceous plants, which were mostly consumed as vegetables, while a small number of woody plants provided snacks, and mushrooms (fungi) were generally ignored. Wild plant resources are used by residents in this region for medicine and food as well as the production of various tools (such as basket weaving with Achnatherum splendens (Trin.) Nevski and broom binding with Achnatherum inebrians (Hance) Keng). Some plants can be used for multiple purposes, although this pattern requires further investigation.

Availability of data and materials

All data, materials, and information are collected from the study sites.

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Acknowledgements

We are very grateful to the local people in Hassan area, who provided valuable information about wild edible plants and hospitality.

Funding

The study was funded by the National Natural Science Foundation of China (81760679), Young Talents Growth Project of the Education Department of Guizhou Province (Qianjiaohe KY Zi [2017] 196), Science and Technology planning project of Guizhou Province (Guizhou Science and Technology Foundation [2019] No.1332), Doctor foundation of Zunyi Medical University (F-941), Science and Technology Fund of Guizhou Provincial Health Commission (gzwkj2021-539), Innovation and Entrepreneurship Training program for Students of Zunyi Medical University (ZYDC2022040).

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Contributions

FMW organized the study team and provided technical support. XHJ and JX executed the research plan. FMW, XHJ, and JX identified the specimen and wrote the manuscript. YXZ and XHL collected the data. FMW and JX reviewed the manuscript. All authors took part in the field works. All authors were involved in the drafting and revision of the manuscript and approved the final revision. All authors read and approved the final manuscript.

Corresponding authors

Correspondence to Jian Xie or Faming Wu.

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The authors asked for permission from the local authorities and the people interviewed to carry out the study.

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Jia, X., Zhao, Y., Zhu, Y. et al. Ethnobotany of wild edible plants in multiethnic areas of the Gansu–Ningxia–Inner Mongolia junction zone. J Ethnobiology Ethnomedicine 18, 53 (2022). https://doi.org/10.1186/s13002-022-00549-1

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Keyword

  • Ethnobotany
  • Wild plants
  • Healthy plants