文献类型：期刊文献

英文题名：Ecological thresholds of toxic plants for sheep production and ecosystem multifunctionality and their trade-off in an alpine meadow

作者：Wang, Yingxin[1,2] Sun, Yi[1] Liu, Yang[1] Wang, Zhaofeng[1] Chang, Shenghua[1] Qian, Yongqiang[2] Chu, Jianmin[3] Hou, Fujiang[1]

第一作者：Wang, Yingxin

通信作者：Hou, FJ[1]

机构：[1]Lanzhou Univ, Key Lab Grassland Livestock Ind Innovat, State Key Lab Grassland Agroecosystems, Coll Pastoral Agr Sci & Technol,Minist Agr & Rural, Lanzhou 730020, Peoples R China;[2]Chinese Acad Forestry, Inst Ecol Conservat & Restorat, Grassland Res Ctr Natl Forestry & Grassland Adm, Beijing 100091, Peoples R China;[3]Chinese Acad Forestry, Res Inst Forestry, Beijing 100091, Peoples R China

年份：2022

卷号：323

外文期刊名：JOURNAL OF ENVIRONMENTAL MANAGEMENT

收录：;EI(收录号：20233314557952);Scopus(收录号：2-s2.0-85138014285);WOS:【SCI-EXPANDED(收录号:WOS:000861579900001)】；

基金：This study was jointly supported by the National Natural Science Foundation of China (32161143028) ; the Program of National Science and Technology Assistance (KY202002011) ; the Program for Innovative Research Team of Ministry of Education (IRT17R50) and the Basic Research Fund of National Non-profit Research Institutions (No. CAFYBB2019ZE001) . We thank Shuaijun Hou, Yuhui Tan and Zhe Wu for their substantial assistance. Special thanks Ken Hodgkinson and Roger Davies for providing valuable comments and fruitful help.

语种：英文

外文关键词：Toxic plants; Thresholds; Livestock production; Ecosystem function; Trade-off; Alpine meadow

摘要：Toxic plants are a natural component of alpine meadow which co-evolved with Tibetan sheep for thousands of years. One challenge for indigenous herders is to know the ecological thresholds of toxic plants and maintain their vital functions in ways that are compatible with economic income and ecological conservation. To achieve this, field trials with Tibetan sheep grazing in alpine meadow were conducted to examine the ecological thresholds of toxic plants for sheep production and ecosystem functions and their trade-offs. Our results demonstrated that the changing point values of biomass proportion of toxic plants for dry matter intake and liveweight gain of sheep were 17% and 22%, respectively. The changing point value of biomass (richness) proportion of toxic plants for soil carbon accumulation index was 31% (59%), for soil nutrient cycling index was 38% (42%), and for ecosystem multifunctionality index was 28% (50%). The trade-off between liveweight gain of sheep and ecosystem multifunctionality first decreased and then increased along the gradient of biomass proportion of toxic plants (the value of changing point was 37%), and had a significant negative correlation with richness of toxic plants. In addition, structural equation modeling indicated that toxic plants can affect the trade-off between liveweight gain of sheep and ecosystem multifunctionality though increasing acid detergent fiber of plant and decreasing plant species richness, belowground biomass and soil total phosphorus. Consequently, opinions towards toxic plants should shift from the conventional view that they are serious threat to grassland ecosystem health to an inclusive understanding that they are beneficial to livestock and ecosystem functions under certain ecological thresholds.