Precipitation manipulation and terrestrial carbon cycling: The roles of treatment magnitude, experimental duration and local climate
Precipitation manipulation and terrestrial carbon cycling: The roles of treatment magnitude, experimental duration and local climate
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DOI：
10.1111/geb.13356
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发表时间：
2021-07
影响因子：
6.4
通讯作者：
Jinsong Wang;Dashuan Tian;A. Knapp;Han Y. H. Chen;Yiqi Luo;Zhaolei Li;E. Hou;Xin Huang;
中科院分区：
文献类型：
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作者：
Jinsong Wang;Dashuan Tian;A. Knapp;Han Y. H. Chen;Yiqi Luo;Zhaolei Li;E. Hou;Xin Huang;
降水调控实验表明，当生态系统受到不同程度的降水变化、不同的实验持续时间或当地气候的异质性影响时，陆地碳（C）循环的响应是多样的。然而，这些因素如何结合联合收割机来影响C循环对降水变化的响应仍不清楚。LocationGlobal.Time period 1990 -2019.Major taxa studied Terrestrial ecosystem.MethodsUsing observations from 230 published studies in the precipitation was manipulated and terrestrial C cycling variables were measured，we conducted a global Meta‐analysis to investigate responses of different C cycling processes to altered precipitation，包括生态系统总生产力、生态系统呼吸、生态系统净生产力、生态系统碳利用效率、净初级生产力（NPP）、地上和地下NPP、地上和地下生物量、冠根比、土壤呼吸和土壤微生物生物量C。我们还发现，NPP及其地上部分（ANPP）的响应减弱与实验时间的降水变化。此外，总生态系统生产力，生态系统呼吸和净生态系统生产力表现出较大的响应，降水量较大的治疗在较短的时间内。土壤呼吸是大多数陆地生态系统碳收支的一个关键组成部分，其响应尤其取决于当地气候。当地温度和降水不仅影响了土壤呼吸对降水变化的响应幅度，而且影响了其对降水处理幅度的敏感性，在干燥和寒冷的站点，土壤呼吸对处理幅度的响应具有更高的敏感性。它们的持续时间和当地气候在生态系统C循环对降水变化的响应，这是至关重要的，以更好地了解生态系统C的过程和功能，并预测他们在不断变化的降水制度。
AimPrecipitation manipulation experiments have shown diverse terrestrial carbon (C) cycling responses when the ecosystem is subjected to different magnitudes of altered precipitation, various experimental durations or heterogeneity in local climate. However, how these factors combine to affect C cycle responses to changes in precipitation remains unclear.LocationGlobal.Time period1990–2019.Major taxa studiedTerrestrial ecosystems.MethodsUsing observations from 230 published studies in which precipitation was manipulated and terrestrial C cycling variables were measured, we conducted a global meta‐analysis to investigate responses of diverse C cycle processes to altered precipitation, including gross ecosystem productivity, ecosystem respiration, net ecosystem productivity, ecosystem carbon use efficiency, net primary productivity (NPP), aboveground and belowground NPP, aboveground and belowground biomass, shoot‐to‐root ratio, soil respiration and soil microbial biomass C.ResultsWe found that C cycling responses were correlated linearly and positively with the magnitude of precipitation treatments. We also detected that the responses of NPP and its aboveground component (ANPP) to altered precipitation weakened with experimental duration. Furthermore, gross ecosystem productivity, ecosystem respiration and net ecosystem productivity showed larger responses to precipitation treatments of greater magnitude over shorter time periods. The response of soil respiration, a key component of the C budget in most terrestrial ecosystems, depended in particular on the local climate. Local temperature and precipitation not only influenced the magnitude of the response of soil respiration to altered precipitation but also affected its sensitivity to the magnitude of the precipitation treatments, with higher sensitivities in the response of soil respiration to treatment magnitude at drier and colder sites.Main conclusionsOur findings highlight the importance of the interactions between the magnitude of precipitation treatments, their duration and the local climate in the response of ecosystem C cycling to altered precipitation, which is crucial to a better understanding of ecosystem C processes and functioning and projecting them under changing precipitation regimes.