Herbaceous layer determines the relationship between soil respiration and photosynthesis in a shrub-dominated desert plant community
Herbaceous layer determines the relationship between soil respiration and photosynthesis in a shrub-dominated desert plant community
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草本层决定了灌木为主的荒漠植物群落土壤呼吸与光合作用之间的关系
DOI：
10.1007/s11104-020-04484-6
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发表时间：
2020-03
期刊：
影响因子：
4.9
通讯作者：
Yan Li
中科院分区：
文献类型：
--
作者：
Jie Ma;Ran Liu;Chenhua Li;Lianlian Fan;Guiqing Xu;Yan Li
目的尽管地上光合产物产生和地下呼吸过程之间的联系已经得到了很好的研究，但对于光合产物调节土壤呼吸（Rsoil）的程度及其在给定生态系统整个生长季节的普遍性仍然存在疑问。本研究旨在测试光合作用是否影响Rsoilat日尺度，并评估它们之间的关系如何改变植被composition.MethodsWe测量Rsoiland毛初级生产力（GPP使用涡度协方差）在连续两个生长季节（2013-2014）在中国西部的沙漠生态系统。我们比较了两个不同植被组成时期（草本-灌木共存期（HSP）和纯灌木主导期（SDP））晴天和阴天的Rsoil，以确定光合作用如何影响Rsoil.ResultsGPP显著调节Rsoil的日变化，尽管土壤温度（Tsoil）和Rsoil之间存在很强的相关性，但这种调节在HSP中是有限的。48.3%的晴天和阴天间Rsoil的变化是由Tsoil的变化和HSP的GPP的变化共同解释的。当春季一年生植物死亡时，晴天和阴天的Rsoil日振幅和平均值无差异，发现。ConclusionsOur结果表明，光合作用对Rsoil的影响在整个生长季节不是恒定的。在草本植物存在下，Rsoil与光合作用直接相关。这些发现强调了光合作用在Rsoil调节中的重要作用，以及群落组成在决定光合作用影响Rsoil的程度方面的重要性。
AimsAlthough the linkages between aboveground photosynthates production and belowground respiration processes have been well studied, doubts remain as to the extent that photosynthate regulates soil respiration (Rsoil) and its generality throughout the growing season in a given ecosystem. This study aimed to test whether photosynthesis affected Rsoilat the diurnal scale and assess how the relation between them changed with changing vegetation composition.MethodsWe measured Rsoiland gross primary productivity (GPP using eddy covariance) in two consecutive growing seasons (2013–2014) in a desert ecosystem, western China. We compared Rsoilon sunny days with that on adjacent cloudy days in two periods with different vegetation compositions [herbs-shrub coexistence period (HSP) and purely shrubs dominated period (SDP)] to identify how photosynthesis affect Rsoil.ResultsGPP regulated diurnal variations of Rsoilconspicuously in spite of the strong correlation between soil temperature (Tsoil) and Rsoil, but such regulation was limited in HSP. 48.3% of the changes in daytime Rsoilbetween sunny and cloudy days was explained by changes in Tsoiltogether with changes of GPP in HSP. When spring annuals died, no differences in daily amplitude and average of Rsoilbetween sunny and cloudy days were found.ConclusionsOur results suggested that effect of photosynthesis on Rsoilwas not constant throughout the growing season. In the presence of herbaceous plants, Rsoilwas directly related to photosynthesis. These findings highlighted the important role of photosynthesis played in Rsoilregulation and the importance of community composition in determining the extent that photosynthesis affects Rsoil.
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影响因子：
9.4
作者：
Vargas, Rodrigo;Allen, Michael F.
通讯作者：
Allen, Michael F.
三种中亚沙漠灌木的水分利用策略及其对降雨脉冲事件的响应
影响因子：
4.9
作者：
通讯作者：
--
水分利用效率随季节和年份的变化：草本植物在沙漠生态系统中的不同作用
影响因子：
9.8
作者：
Liu Ran;Li Yan;Wang Yugang;Ma Jie;Cieraad Ellen
通讯作者：
Cieraad Ellen
影响因子：
4.9
作者：
F. Warembourg;E. Paul
通讯作者：
F. Warembourg;E. Paul
影响因子：
3.7
作者：
Breecker, D. O.;McFadden, L. D.;Litvak, M. E.
通讯作者：
Litvak, M. E.