An ethnobotanical study on medicinal food plants used by the Kazakh people in Altay, Xinjiang, China.

Background: The Kazakh people of Altay, Xinjiang, possess rich traditional knowledge associated with medicinal food plants (MFPs), shaped by their nomadic pastoralist heritage and the unique mountain-grassland ecosystems of the region. However, this biocultural heritage remains insufficiently documented and is increasingly threatened by human's economic activities, rapid globalization, climate change, and generational knowledge loss. This study aimed to record MFPs, evaluate their cultural and ecological relevance, and assess their conservation challenges.

Methods: Ethnobotanical fieldwork was conducted in 2012 and 2017 across Altay Prefecture. Data were obtained through semi-structured interviews with 100 key informants, including traditional healers, herders, and merchants, complemented by focal group discussions, field observations, and voucher specimen collection. Voucher specimens were deposited at the Herbarium of the Xinjiang Uygur Autonomous Region Institute of Traditional Chinese Medicine and Ethnomedicine (XJNM). Use-value (UV) index was calculated to assess the relative importance of each species. Traditional knowledge, edible applications, and sustainability concerns were systematically documented.

Results: A total of 118 MFP species were identified, belonging to 37 families and 85 genera. Rosaceae (12.7%), Asteraceae (7.6%), Polygonaceae (7.6%) and Fabaceae (7.6%) were the most represented families. Herbaceous plants dominated (69.5%), with fruits (33.9%) and roots (20.3%) being the primary edible parts. Species with the highest medicinal UV included Glycyrrhiza uralensis (UV = 0.56), Taraxacum officinale (UV = 0.41), and Codonopsis pilosula (UV = 0.34). MFPs were primarily used to treat digestive (26.1%) and respiratory (17.7%) ailments, reflecting the health challenges associated with a nomadic lifestyle. These plants are also deeply embedded in cultural practices, including seasonal dietary customs (e.g., sea buckthorn jam), spiritual rituals, and ecological taboos such as phenology-based harvest timing. Key threats to MFPs sustainability include overharvesting (30.5% of species are now cultivated to mitigate pressure), climate change impacts on alpine habitats, and the erosion of traditional knowledge, as only 9% of informants with rich knowledge of MFPs were under the age of 30.

Conclusions: Kazakh MFPs represent a culturally integrated "medicine-food continuum" intricately adapted to local ecological conditions. Sustainable utilization requires the incorporation of traditional knowledge-such as phenology-informed harvesting practices-into conservation strategies, the promotion of community-led cultivation of vulnerable species, and the documentation of associated cultural practices. Given accelerating environmental and sociocultural shifts, urgent efforts are needed to preserve this fragile biocultural heritage.