Review of drought impacts on carbon cycling in grassland ecosystems

作者：Tianjie LEI,Jie FENG,Cuiying ZHENG,Shuguang LI,Yang WANG,Zhitao WU,Jingxuan LU,Guangyuan KAN,Changliang SHAO,Jinsheng JIA,Hui CHENG

摘要：Grasslands play a key role in both carbon and water cycles.In semi-arid and arid grassland areas,the frequency and intensity of droughts are increasing.However,the influence of a drought on grassland carbon cycling is still unclear.In this paper,the relationship between drought and grassland carbon cycling is described from the perspective of drought intensity,frequency,duration,and timing.Based on a large amount of literature,we determined that drought is one of the most prominent threats to grassland carbon cycling,although the impacts of different drought conditions are uncertain.The effects of a drought on grassland carbon cycling are more or less altered by drought-induced disturbances,whether individually or in combination.Additionally,a new conceptual model is proposed to better explain the mechanism of droughts on grassland carbon cycling.At present,evaluations of the effects of droughts on grassland carbon cycling are mainly qualitative.A data fusion model is indispensable for evaluating the fate of carbon cycling in a sustainable grassland system facing global change.In the future,multi-source data and models,based on the development of single and multiple disturbance experiments at the ecosystem level,can be utilized to systematically evaluate drought impacts on grassland carbon cycling at different timescales.Furthermore,more advanced models should be developed to address extreme drought events and their consequences on energy,water,and carbon cycling.

发文机构：State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of Water Resources and Hydropower Research（IWHR） Institute of Loess Plateau National Hulunber Grassland Ecosystem Observation and Research Station&Institute of Agricultural Resources and Regional Planning Department of Geography/CGCEO State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering

关键词：DROUGHTcarboncyclinggrasslandsconceptualmodelinteractivemechanismsdatafusion

分类号： S81[农业科学—畜牧学]