What is the pathway that determines the diurnal lag time between soil respiration and soil temperature?
What is the pathway that determines the diurnal lag time between soil respiration and soil temperature?
复制标题
决定土壤呼吸与土壤温度之间日滞后时间的途径是什么？
DOI：
10.1016/j.geoderma.2023.116344
复制
发表时间：
2023-03
期刊：
影响因子：
6.1
通讯作者：
Yuying Shen
中科院分区：
文献类型：
--
作者：
Houkun Chu;Hong Ni;Jingyong Ma;Yuying Shen
Soil respiration (Rs) is a critical component of the global carbon cycle in terrestrial ecosystems and is considered a function of soil temperature (Ts); however, Rs often shows a hysteresis effect with Ts. The mechanism causing this hysteresis pattern remains controversial, hindering our ability to accurately simulate and predict Rs in response to climate change. Here, a two-year field experiment was conducted to investigate the factors and pathways influencing the diurnal lag time between Rs and Ts (LTTs−Rs); we used an automatic chamber continuous measurement of Rs combined with 3 levels of precipitation manipulation: −30 % (P − 30), +0% (CK), +30 % (P + 30) of ambient precipitation in rain-fed winter wheat (Triticum aestivumL.) and alfalfa (Medicago sativaL.) agroecosystems on the Loess Plateau, China. The results indicated that the monthly average diurnal dynamic peak time of Rs always occurred prior to that of Ts. The LTTs−Rsranged from 1 h to 8 h in winter wheat under the three precipitation treatments over two years. The range was similar in alfalfa under the CK and P + 30 treatments; however, in alfalfa, the value ranged from 1 h to 10 h under the P − 30 treatment. The LTTs−Rsvalue is determined by the direct pathway of photosynthetic product transport (the lag time between Rs and photosynthetically active radiation (PAR), LTRs−PAR) and the indirect pathway of heat transfer (the lag time between Ts and PAR, LTTs−PAR); that is, the LTTs−Rsis equal to the sum of the LTRs−PARand LTTs−PAR. Moreover, the LTTs−PARis equal to the sum of the lag time between air temperature (Ta) and PAR (LTTa−PAR) and the lag time between Ta and Ts (LTTs−Ta) in both winter wheat and alfalfa under the three precipitation treatments. Soil volume water content (VWC) affects LTTs−Rsby influencing the process (i.e., the transport process of heat and photosynthate) that comprises the LTTs−Rs. This is the first attempt to quantify the pathway processes that determine the LTTs−Rsand clarify the mechanism of the LTTs−Rsresponse to VWC. The results have important implications for our understanding of the LTTs−Rsproduction mechanisms and the accurate prediction of soil carbon emissions by future models.
登录
查看更多内容
高寒草甸生态系统碳通量组分对实验降水梯度的差异响应
影响因子：
5.2
作者：
Zhang Fangyue;Quan Quan;Ma Fangfang;Tian Dashuan;Zhou Qingping;Niu Shuli
通讯作者：
Niu Shuli
影响因子：
4
作者：
J.-L. Zhang;Liyuan Meng;K. Cao
通讯作者：
J.-L. Zhang;Liyuan Meng;K. Cao
半干旱生态系统中以苔藓为主的生物结皮的呼吸速率及其与温度和水分的关系
影响因子：
6.2
作者：
Yao Xiaomeng;Xiao Bo;Kidron Giora J;Hu Kelin
通讯作者：
Hu Kelin
影响因子：
9.7
作者：
Weimin Song;Shiping Chen;Bo Wu;Yajuan Zhu;Yadan Zhou;Q. Lu;G. Lin
通讯作者：
Weimin Song;Shiping Chen;Bo Wu;Yajuan Zhu;Yadan Zhou;Q. Lu;G. Lin
影响因子：
3.7
作者：
Jia X;Zha T;Wu B;Zhang Y;Chen W;Wang X;Yu H;He G
通讯作者：
He G