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Ethnobotanical study on wild plants used by Lhoba people in Milin County, Tibet
Journal of Ethnobiology and Ethnomedicine volume 11, Article number: 23 (2015)
The Lhoba are a small ethnic group, located in the Tibet Autonomous Region of China. Until 1960, their livelihood was predominantly based on swidden agriculture, hunting, and gathering. To investigate and document the plant species used by the Lhoba, ethnobotanical surveys were conducted in three villages of Nanyi Township in Milin County, Tibet, China.
Ethnobotanical surveys were conducted in three Lhoba villages using key informant interviews and semi-structured interviews. Plants traditionally used by the Lhoba were documented. Data obtained were analyzed through informant consensus factor analysis (FIC) to determine the homogeneity of the informants’ knowledge of medicinal plants.
Fifty-nine plant species belonging to 49 genera and 28 families were recorded and collected. Twenty-eight species are ethnomedicinal plants, 29 are local edible plants, and 23 are used for other purposes in Lhoba daily life. The medicinal plant species are used for treating eight categories of illness. Most medicinal plants are herbs (71.4%) or roots (39.2%). Nutrition adjustment (FIC = 0.76) and dermatological infections (FIC = 0.56) showed the highest FIC, indicating that the Lhoba had the highest level of agreement about the use of plants for these two illness categories. Fruit is the most frequently used part of the edible plants. Nine edible plant species are used as herbal medicine. Plant species used for other purposes include, six species for fuel, five for dye material, six for religious use, four for timber, two for tobacco substitutes, and one for fodder.
Some traditional technologies and customs of Lhoba, such as dyeing and bamboo weaving, have remained the same for centuries. In contrast, the Lhoba’s knowledge of ethnomedicine has been recently influenced by traditional Tibetan and Chinese medicine, resulting in the loss of traditional knowledge in this sector. In addition, the development of tourism has influenced a change in the Lhoba lifestyle and their production of traditional products. These events signal the need to invest in mechanisms that can enable the Lhoba to benefit from the use of their traditional plant-derived culture and therefore support the continued conservation and use of these important plant resources.
The southeast area of Tibet is one of the 25 biodiversity hotspots in the world . The area is rich in biological resources due to its subtropical humid and semi-humid climate, which extend over extreme elevational differences. Rich medicinal plant resources are distributed in different geographical areas of the region. The region that Nanyi Village is located in has been regarded as a sacred site, and called “Medicinal Lord’s Valley” by healers . The people living in Milin consist primarily of three ethnic groups: the Tibetan, the Monpa (or Moinba or Menba), and the Lhoba (or Luoba). The Lhoba are distributed in three counties of the Nyingchi (Linzhi) Prefecture: Milin, Medog, and Zayü, and in Lhünzê County of the Shannan Prefecture . Researchers have speculated that the Lhoba might be from the integration of several ancient tribes of the southeastern Qinghai-Tibet Plateau [4,5]. Before the Chinese government recognized and decided on “Lhoba” as their unified name in 1965 , each tribe had an independent name and a different dialect, “Bo’gaer”, “Bengni”, and “Miguba” [5,7]. “Lhoba” is derived from pronunciation of which means “southerner” in the Tibetan language”, and has been used to refer to the people living in Lhoyü, Tibet . According to the 2010 census, there are only 3,682 Lhoba in the modern-day Tibet Autonomous Region in China, and Milin County contains the largest population of Lhoba (Bo’gaer tribal group) that lacks a mixed inhabitation with other ethnic groups [8,9]. Before the 1960s, the Lhoba mainly lived on the abundant plant resources in the Tibetan mountain valleys. They practiced swidden agriculture, in addition to hunting and gathering activities. For centuries, these plant resources have provided the Lhoba’s most important source for medicine and food supplements [10,11]. The Lhoba have a rich information base of ethnobotanical knowledge for describing and using these species.
The majority of plant-based chemical compounds, which now provide important components of medicines in the world market, come from traditional medicinal plants through the isolation and analysis of the active components . In many developing countries, up to 80% of the population continue to depend on traditional medicines for their primary health care needs . Many valuable nutritional foods came from traditional foods , while the value of wild food plants is very important for cultural and nutritional perspectives . Traditional plant-based knowledge and the plants themselves remain crucial for the development of new drugs, preparation of ethnic food, and other plant based product development [15-18].
The Tibetan region is a hot spot for ethnobotanical studies [19-21], particularly related to Tibetan medicine [22-25]. In recent years, wild edible plants used by Tibetan ethnic groups have become of interest to ethnobotanists. Ju and colleagues identified and recorded the use of over 168 wild edible plant species used by Tibetans in the Shangri-la region in Yunnan Province, China . Kang and colleagues surveyed 81 species of wild food plants used by the Tibetans of Gongba Valley in Zhouqu County, Gansu Province, China . However, to date, the knowledge of medicinal and wild edible plants in the Lhoba communities has been unexplored.
The purpose of this study was to document the traditional ethnobotanical knowledge of the Lhoba, to understand the relationships between the Lhoba and their living environment, and to review the impact of Tibetan culture on this knowledge. We also examined whether the ethnobotanical knowledge of the Lhoba was similar to published information on the Lhoba tribes in neighboring India.
This study was conducted in September 2012, and July to September 2013, in three villages of Nanyi Township in Milin County: Caizhao Village (N 29°11′,E 94°11′), Qionglin Village (N 29°12′, E 94°12′), and Nanyi Village (N 29°10′, E 94°12′) (Figure 1). Nanyi Township covers a total area of 648.4 km2, including 38.7 km2 of forest, 140 km2 of grassland, and 2.3 km2 of glaciers. There are 109 families living in the county with a total population of 515. Milin County lies in the middle river valley of the Yarlung Tsangpo River, with an average altitude of 2,940 m. The average temperature of the coldest month ranges from 0.1°C to 3.2°C, and the average temperature of the hottest month ranges from 12.3°C to 17.4°C. The annual average rainfall is 600 mm, and the average humidity is 66% . Mountain brown soil and dark brown soil are the major types of soil. The vegetation of the area is dominated by a temperate semi-humid monsoon forest.
In the study area, the Lhoba use the Bo’gaer dialect, which belongs to the Tani language branch of the Sino-Tibetan language family of the Tibeto-Burman language . The Lhoba traditional houses are built with bamboo and timber. Three stones lie in the center of the house, with a stone bowl on them, used for cooking food. Staple foods are finger millet (Eleusine coracana), rice, corn, and buckwheat. Clothes are usually made from bamboo shells, vines, bearskins, and palm fibers. The traditional belief of the Lhoba is animism; the ghost, god, demon, and elf are not distinguished, and all of them are called “Wuyou” . The Lhoba have two kinds of witches or wizards for divination and to sacrifice to. Recently, Lhoba traditional culture has been deeply affected by Tibetan culture; most young and mid-aged Lhoba speak the Tibetan language or Mandarin Chinese, and Tibetan New Year is their major festival .
Ethnobotanical survey and data collection
The traditional plant-based information was collected through participatory rural appraisal (PRA), direct observation, and semi-structured and key informant interviews [30-33]. Twenty-three respondents with ages ranging from 20 to 65 years were included in the interviews. Informants were asked to give the local names of plants, ailment treated, parts used, cooking or preparation method, and other uses of the plants. Interviews were conducted in the local language by visiting each respondent individually, with assistance from translators and field work guides from the township. Permissions were provided by all participants in this study, including the local Lhoba people. Consent was obtained from the participants prior to this study being carried out. Uses of the plants were grouped into three categories: medicinal, edible, and other uses. Specimens were collected and identified by the authors and deposited in the Herbarium of Minzu University of China (Beijing).
To estimate the consistency of informants and the extent that the informants agree on the use of certain plant species for the treatment of a given illness or illness category, an informant consensus factor (FIC) was calculated for testing homogeneity in informant responses . The formula is:
where Nur is the number of individual plant use-reports for each ailment category, and Nt is the total number of species used by all informants for this ailment category. FIC values range from 0 to 1, where higher values indicate higher consensus.
Results and discussion
Ethnobotanical information for 59 plant species belonging to 49 genera and 28 families were collected from the study area (Table 1). These species include angiosperms (54 spp.), gymnosperms (2), pteridophyte (1), algae (1), and lichen (1). Within these plant species, 36 are herbaceous (61%), 14 are shrubs (24%), and nine are trees (15%). According to our survey, 28 species are ethnomedicinal plants, 29 are local edible plants, and 23 are used for other purposes in Lhoba daily life, such as fuelwood (6), dye (5), religious (6), timber (4), tobacco substitutes (2), and fodder (1) (Figure 2).
Wild medicinal plants
The information for the ethnomedicinal species was recorded, including the botanical names, the local names, the part used, the method of preparation, and the ailments treated. Most medicinal plants are herbs (71.4%). Roots (39.2%) are the most predominantly used part of these medicinal plants, followed by fruits (28.6%), whole plant (28.6%), leaves (3.6%), branches (3.6%), and flowers (3.6%). Results are similar to other ethnobotanical studies of medicinal plants , in that the most frequently used part of the plant was the underground part, where higher amount of bioactive compounds than for the other parts are noted . The most commonly used method of preparation was decoction, in which the plant is boiled in water until the water is reduced to more than half its original volume.
Based on the information from the informants, the uses for all reported illnesses for wild medicinal plants are grouped into eight categories  (Table 2): dermatological infections/diseases, circulatory system, genito urinary ailments, hair disorders, gastro intestinal ailments, nutrition adjustment, respiratory system disorders, and skeleton muscular system disorders. FIC results for the eight illness categories ranged from 0.3 to 0.76, with the highest for nutrition adjustment (FIC = 0.76; 6 species, 22 use-reports) and dermatological infections (FIC = 0.56; 5 species, 10 use-reports) (Table 2). One of the Lhoba’s important avocations is hunting, which is associated with injuries from accidents. Dysosma tsayuensis and Sinopodophyllum hexandrum were the most commonly used species for treating gynecological diseases or as hematinics. According to the China Red Data Book, Dysosma tsayuensis and Sinopodophyllum hexandrum are vulnerable species, Coptis teeta is an endangered species, and Dysosma tsayuensis is endemic to Tibet [38,39].
Literature studies revealed that the same parts of 12 of the species (43%) collected in this study are also used in Tibetan medicine  (Table 3). Three of these species: Berberis pruinosa, Polygonum tortuosum, and Potentilla anserina, are used in Tibetan medicine to treat the same ailments. Seven other species (Angelica apaensis, Dysosma tsayuensis, Sinopodophyllum hexandrum, Cirsium eriophoroides, Erigeron breviscapus, Coptis teeta, Usnea spp.) had partial uses similar with Tibetan medicine. And the two remaining species (Rosa omeiensis and Sambucus adnata) are used for different uses by the Lhoba than in Tibetan medicine. Although some studies indicated more Lhoba living in adjacent Indian, only two speices, Litsea cubeba  and Coptis teeta [18,19,22] were used in the same ways by the Lhoba and these tribal peoples [11,41-44].
Wild edible plants
Twenty-nine wild plant species are commonly used as food in Lhoba society, including 12 herbs, 10 shrubs, and 7 trees. The most frequently used part is the fruit (19 species, 65.5%). This is similar to the percentage use of the fruit of wild edible plants in the Sikkim Himalaya . The Lhoba depended on wild fruit such as Rosa omeiensis, Rubus biflorus, Sorbus thibetica, or Ribes himalense for vitamines and nutrients nutrition. Reliance on fruit from wild edible species may be related to the low productivity of cultivated fruit trees of the Lhoba. The Lhoba reported that eating too much Sambucus adnata (Ong na nie na san dou ba) causes headaches. Most fruit are eaten directly, except Quercus aquifolioides (Sen nie ya ye), Litsea cubeba (De yi), Litsea pungens (Ta er), and Zanthoxylum bungeanum (Ye ma). Fruits of Quercus aquifolioides “Sen nie ya ye” are the Lhoba’s traditional food. The Lhoba remove the nutshell and astringency, crush the nuts, and bake the flower from the nuts as cakes. “De yi”, “Ta er,” and “Ye ma” are used as important spices or spice substitutes, and are boiled or stir-fried with other vegetables or meat. The Lhoba also mix spices with salts, yogurt, crushed vegetables, or mushrooms, and then dip steamed bread in this mixture. Bamboo shoots are usually collected and eaten from wild bamboo species, such as Fargesia macclureana, and are usually made as sour bamboo shoots for longer storage and a change in taste. Out of 29 wild edible species, nine are also used as herbal medicine. Veronica anagallis-aquatica, for example, is usually boiled as a vegetable and could be used for treating sore throats.
Plants used for other purposes
Dye plants are significant in the Lhoba’s livelihoods. The Lhoba have rich experience in extracting dye from plants and in dye technology. The exchange of dye plants has an important position in trade between the Lhoba and the Tibetans, because dye plants are the main raw material for Tibetan Buddhists to dye their clothes. The investigation revealed that Berberis pruinosa (Sai mang), Hippophae rhamnoides subsp. yunnanensis (Da guo), Berberis temolaica (Si sen), Rubia cordifolia (Da min), and Polygonum hydropiper (A er) are common dyeing species. Boiling the fruits or roots of “Sai mang”, “Si sen”, or “Da guo” with thread for one hour produces a thread that can be dyed yellow. “Da min” can turn yellow thread to red. “A er” can be used for dyeing wools to black. The Lhoba people put mashed “A er” into a gourd cask with wool, then mix with hot water, and hang the sealed gourd cask over fireplace; after fermenting for 4–5 days, the dyed black wool is taken out and dried in the sunlight. Polygonum hydropiper and Rubia cordifolia are also used as dye plants called “Chhum-gon” in Monpa and “Tamen” in Adi, respectively .
Abies forrestii, Juniperus squamata, and Quercus aquifolioides are the main timber species that the Lhoba used for building their houses and are also used to make agricultural tools or daily-life utensils. For example, Abies forrestii can be used to make barrels and Quercus aquifolioides for “Da luo”, is used to make wooden shovels for digging. Bamboo weaving of the Lhoba in Nanyi is very famous. The common bamboo species is Fargesia macclureana. Bamboo canes are cut into thin ribbons and used for weaving baskets, mats, cages, bowls, rain gear, bows, arrows, and some other common livelihood items (Figure 3). The bamboo weaving handicraft skills of the Lhoba are similar to the Yak Pastoralists .
The Lhoba culture has been deeply impacted by Tibetan culture. The Lhoba have animistic beliefs, but they have adopted many religious rituals of Tibetan Buddhism, such as burning offerings . Potentilla anserina, Artemisia vestita, Ajania tenuifolia, Juniperus squamata, Rhododendron cephalanthum, and Rhododendron primulaeflorum are used as incense sources, which play an important role in the religious activities of the Lhoba. Plants used for fuelwood plants include three tree species: Quercus aquifolioides Juniperus squamata, and Abies forrestii, and three herbaceous species: Anaphalis nepalensis, Leontopodium dedekensii, and Fargesia macclureana. The three herbaceous species are used as good kindling. Most Lhoba, both male and female, have the habit of smoking, and use Anaphalis nepalensi and the fruits of Hypericum bellum as substitutes for tobacco.
The study revealed that the traditional uses of plant species of the Lhoba in Milin County are closely related to their living environment. For example, palms are mentioned in earlier studies of Lhoba culture in Medog County, a county adjacent to Minlin County, but at lower elevations with a tropical environment . Studies for Medog County mentioned that, in food shortage situations, the Lhoba in Medog County extracted starch from palm’s stems as an important wild food source, and used tropical fruits such as banana, citrus, and betel nuts [48,49]. Our investigation found no record of the Lhoba using palms or tropical fruits, which may be due to the differences in climate and thus available possible species to be exploited as food .
The Lhoba transfer their plant-based knowledge from one generation to the next through elders by oral tradition, without any written documents. The influence of tourism, socioeconomic development, the small group size, and a lack of interest shown by the young generation have seriously threatened this non-literate ethnic culture [11,51]. Recently, better accesses to markets have provided the younger generation with sufficient food and medicine, removing the need for wild plant harvest. In addition, our results show that increased publicity for and availability of Tibetan and Chinese medicines has affected the indigenous knowledge of the Lhoba, especially the youth who put more value on the medicines that pharmaceutical companies or medicine buyers are purchasing from the community, such as Ophiocordyceps sinensis. Recent tourism has also affected the passing on of Lhoba traditional culture. Lhoba run businesses often serve as guides in the adjacent tourism area. The influenced of tourism culture, used for attracting tourists has resulted in tourist guides providing incorrect or unreliable information on Lhoba culture. For example, Lhoba guides told tourists that Hippophae rhamnoides subsp. yunnanensis was the holy tree in traditional Lhoba culture, while other Lhoba, not in the tourist business, stated that this claim was incorrect.
This study documented traditional ethnobotanical knowledge of the Lhoba in Nanyi Township, Milin County, Tibet. Fifty-nine wild plant species were found to be used in traditional medicines, food, dyeing technologies, and religion. These species mainly came from the surrounding areas. Some of these materials are important trade items in local Tibetan and Lhoba markets. The Lhoba in Nanyi use the same plant species for dyes and had similar bamboo weaving handcraft as tribes in adjacent areas in India. In contrast the Lhoba’s use of ethnomedicinal species has been deeply influenced by traditional Tibetan medicine and Chinese medicine. This study reported less plant species compared to other ethnic communities in Tibet. This may be due to the small size of the Lhoba population. The improved access to imported goods from outside their community and the development of tourism has changed the Lhoba lifestyle and production structure. These events signal the need to invest in mechanisms that can enable the Lhoba to benefit from the use of their traditional plant-derived culture and therefore support the continued conservation and use of these important plant resources.
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We thank all the survey practitioners who generously shared their experiences and knowledge with us. Members of the Ethnobotanical Laboratory at Minzu University of China, and the Research Group of Ethnobotany at Kunming Institute of Botany, Chinese Academy of Sciences, participated in the field work and discussion. We are also grateful to the Lhoba people in Minlin County, local guides and translators. This research was funded by the National Natural Science Foundation of China (31400192), the General Financial Grant from the China Postdoctoral Science Foundation (2013 M530864), the National Natural Science Foundation of China (31161140345), and the Ministry of Education of China through its 111 and 985 projects (B08044, MUC985 & YLDX01013).
The authors declare that they have no competing interests.
FL, JZ, and CL participated in the field surveys and conceived the study. FL, CL, and BL identified all plants. FL coded all the data and wrote the first draft of the manuscript. DJ joined in the discussion and revised the paper. All authors contributed to interpretation of the results and contributed to the final manuscript. All authors read and approved the final manuscript.
Chunlin Long is a full professor at the College of Life and Environmental Sciences, Minzu University of China, Beijing, and research professor at the Kunming Institute of Botany, Chinese Academy of Sciences, Kunming. His research focuses on ethnobotany and ethnomedicine, biodiversity, and plant genetic resources. Feifei Li is a postdoctoral research fellow at the College of Life and Environmental Sciences, Minzu University of China, Beijing. Jingxian Zhuo is a master degree student at the College of Agronomy and Biotechnology, Yunnan Agricultural University, and the Kunming Institute of Botany, Chinese Academy of Sciences, Kunming. Devra Jarvis is a principal scientist for crop genetic diversity, productivity, and resilience at Bioversity International, Rome, and adjunct faculty at Washington State University, Pullman, WA, USA. Bo Liu is a lecturer at the College of Life and Environmental Sciences, Minzu University of China, Beijing.
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Li, F., Zhuo, J., Liu, B. et al. Ethnobotanical study on wild plants used by Lhoba people in Milin County, Tibet. J Ethnobiology Ethnomedicine 11, 23 (2015). https://doi.org/10.1186/s13002-015-0009-3
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