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鼎湖山站揭示草地和森林两类生态系统土壤呼吸对降水量变化的不对称响应
作者: 鼎湖山站 更新时间: 2020-07-31
    气候变暖导致水循环过程增强,使得全球范围内极端降水事件引起的旱涝灾害发生频率大幅提高,这将对陆地生态系统碳循环产生显著影响。研究表明,地上净初级生产力对极端降水量变化的响应为非线性,且显著区别于其对中强度降水量变化的响应。然而,作为碳循环关键过程的土壤呼吸对极端降水变化的响应并不清楚。

 

                                       土壤呼吸与降水量变化百分比的相关关系(

 

 

Intensification of the Earth’s hydrological cycle amplifies the interannual variability of precipitation, which will significantly impact on terrestrial carbon cycle. However, it is still unknown whether previously observed relationship between soil respiration and precipitation remains applicable under extreme precipitation change.

The response of soil respiration to precipitation change was highly nonlinear or asymmetric, and differed significantly between grasslands and forests, between moderate and extreme precipitation changes. Soil respiration response was negatively asymmetric (concave-down) in grasslands, and double-asymmetric in forests with a positive asymmetry (concave-up) under moderate precipitation changes and a negative asymmetry (concave-down) under extreme precipitation changes (Figure 1). The different asymmetric responses of soil respiration between grasslands and forests will greatly improve our ability to forecast the carbon cycle consequences of increased precipitation variability. Specifically, the negative asymmetry of soil respiration response under extreme precipitation change suggests that the soil carbon efflux will decrease across grasslands and forests under future precipitation regime with more wet and dry extremes.

This study entitled “The response of soil respiration to precipitation change is asymmetric and differs between grasslands and forests” was published in Global Change Biology. For further reading, please refer to:  

 

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