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Response of soil respiration to short-term changes in precipitation and nitrogen addition in a desert steppe

Journal of Arid Land 2023年第9期15卷 1084-1106页

作者： MA Jinpeng PANG Danbo HE Wenqiang ZHANG Yaqi WU Mengyao LI Xuebin CHEN Lin College of Forestry and Prataculture Ningxia UniversityYinchuan 750021China College of Ecological Environment Ningxia UniversityYinchuan 750021China Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwest China Ningxia UniversityYinchuan 750021China

Changes in precipitation and nitrogen(N)addition may significantly affect the processes of soil carbon(C)cycle in terrestrial ecosystems,such as soil ***,relatively few studies have investigated the effects of changes in precipitation and N addition on soil respiration in the upper soil layer in desert *** this study,we conducted a control experiment that involved a field simulation from July 2020 to December 2021 in a desert steppe in Yanchi County,***,we measured soil parameters including soil temperature,soil moisture,total nitrogen(TN),soil organic carbon(SOC),soil microbial biomass carbon(SMBC),soil microbial biomass nitrogen(SMBN),and contents of soil microorganisms including bacteria,fungi,actinomyces,and protozoa,and determined the components of soil respiration including soil respiration with litter(RS+L),soil respiration without litter(RS),and litter respiration(RL)under short-term changes in precipitation(control,increased precipitation by 30%,and decreased precipitation by 30%)and N addition(0.0 and 10.0 g/(m^(2)·a))*** results indicated that short-term changes in precipitation and N addition had substantial positive effects on the contents of TN,SOC,and SMBC,as well as the contents of soil actinomyces and *** addition,N addition significantly enhanced the rates of RS+L and RS by 4.8%and 8.0%(P0.05).The mean RL/RS+L value observed under all treatments was 27.63%,which suggested that RL is an important component of soil respiration in the desert steppe *** results also showed that short-term changes in precipitation and N add

关键词： soil respiration litter respiration nitrogen deposition soil carbon soil microorganisms climate change desert steppe ecosystems

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