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Long-term mowing regulates the responses of above- and below-ground net primary productivity stability to water and nitrogen addition in a temperate steppe
第一作者：Jun Sheng
刊物名称：Functional Ecology
发表年份：2025
文章摘要：
- Global change,including atmospheric nitrogen (N) deposition,shifts in precipitation patterns,and anthropogenic activities such as mowing,have great impacts on the structure and functions of grassland ecosystems. However,whether and how the N deposition,change in precipitation and long-term mowing influence the stability of above- and below-ground net primary productivity of grassland ecosystems remain unexplored.
- Here,we investigated the effects of N addition and water addition on the stability of above-ground net primary productivity (ANPP) and below-ground net primary productivity (BNPP),and explored the driving factors in a 19-year water addition and N addition experiment under the long-term-mowing and no-mowing regimes in a temperate steppe in Inner Mongolia.
- Long-term mowing weakened the positive effect of water addition on ANPP stability by dampening the effect of water addition on species asynchrony,and altered the effect of N addition on ANPP stability from neutral to negative by exacerbating the negative impact of N addition on species asynchrony. By contrast,long-term mowing enhanced the positive effects of water addition and N addition on BNPP stability by strengthening the effects of water addition and N addition on grass ANPP,which subsequently decreased the standard deviation (SD) of BNPP. Under the long-term-mowing regime, water addition directly enhanced ANPP stability, whereas N addition reduced ANPP stability by decreasing species asynchrony. Water addition and N addition enhanced grass ANPP, thereby leading to a decrease in the SD of BNPP and consequently an increase in BNPP stability. Under the no-mowing regime, water addition directly enhanced ANPP stability and indirectly increased ANPP stability by increasing species asynchrony. Water addition promoted species asynchrony,leading to a reduction in the SD of BNPP and an increase in BNPP stability,while N addition increased BNPP stability via enhancing grass ANPP.
- Our results reveal that the responses of grassland ANPP and BNPP stability to water addition and N addition depend upon long-term-mowing management. These findings highlight the necessity to take into account the grassland management regimes in evaluating ecosystem stability under the scenario of global change.
