Chinese Journal of Plant Ecology >
Nonlinear responses of productivity and diversity of alpine meadow communities to degradation
Online published: 2018-03-08
Supported by
Supported by the National Key Research and Development Project of China(2016YFC0501802);Supported by the National Key Research and Development Project of China(2017YFA0604802);the National Natural Science Foundation of China(41571195);the National Natural Science Foundation of China(41501103)
Aims The alpine meadow degradation could have profound effects on the grassland productivity. The aim of our study is to clarify the dynamic response of community productivity and species diversity in the process of alpine meadow degradation.
Methods In the Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Northern Tibetan Grassland Ecosystem Research Station (Nagqu station), we conducted stages experiments with multiple degradation levels: control, mild degraded meadow, moderate degraded meadow, severe degraded meadow and serious sandy meadow.
Important findings The response of aboveground biomass to alpine meadow degradation showed a linear or nonlinear increased response patterns, but the belowground biomass and total biomass decreased nonlinearly. As observed in measurement of aboveground biomass, Margalef index, Simpson index, Shannon-Wiener index and Pielou evenness index also exhibit a nonlinear increased response to degradation. The results of structural equation models showed that belowground biomass has a positive relationship with soil carbon content (p < 0.05) and volume water content (p < 0.1). However, soil nutrient and soil physical properties had no significant impact on aboveground biomass (p < 0.1). Compared with soil physical properties, soil nutrition is an important factor influencing the diversity index. In our study, the nonlinear responses of productivity and diversity of alpine meadow were described by using the multiple levels of degradation in space. The results suggested that aboveground productivity cannot interpret the degree of degradation of alpine meadow, and by contrast, alpine meadow degradation should be measured by the change of plant functional groups, such as edible grasses and poisonouups, such as edible grasses and poisonous forbs.
CHEN Ning, ZHANG Yang-Jian, ZHU Jun-Tao, LI Jun-Xiang, LIU Yao-Jie, ZU Jia-Xing, CONG Nan, HUANG Ke, WANG Li . Nonlinear responses of productivity and diversity of alpine meadow communities to degradation[J]. Chinese Journal of Plant Ecology, 2018 , 42(1) : 50 -65 . DOI: 10.17521/cjpe.2017.0252
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