Review of drought impacts on carbon cycling in grassland ecosystems

doi:10.1007/s11707-019-0778-4

Front. Earth Sci.

2020, Vol. 14

Issue (2) : 462-478 https://doi.org/10.1007/s11707-019-0778-4

REVIEW ARTICLE

Review of drought impacts on carbon cycling in grassland ecosystems

Tianjie LEI^1,², Jie FENG^1,², Cuiying ZHENG^1,², Shuguang LI^1,², Yang WANG^1,², Zhitao WU³, Jingxuan LU^1,², Guangyuan KAN^1,², Changliang SHAO^4,⁵, Jinsheng JIA^1,²(

), Hui CHENG^1,^2,⁶(

)

¹. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, Beijing 100038, China
². China Institute of Water Resources and Hydropower Research (IWHR), Beijing 100038, China
³. Institute of Loess Plateau, Shanxi University, Taiyuan 030006, China
⁴. National Hulunber Grassland Ecosystem Observation and Research Station & Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
⁵. Department of Geography/CGCEO, Michigan State University, East Lansing, MI 48823, USA
⁶. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China

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Abstract

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.

Keywords drought carbon cycling grasslands conceptual model interactive mechanisms data fusion

Corresponding Author(s): Jinsheng JIA,Hui CHENG

Online First Date: 17 January 2020 Issue Date: 21 July 2020

Cite this article:

Tianjie LEI,Jie FENG,Cuiying ZHENG, et al. Review of drought impacts on carbon cycling in grassland ecosystems[J]. Front. Earth Sci., 2020, 14(2): 462-478.

URL:

https://academic.hep.com.cn/fesci/EN/10.1007/s11707-019-0778-4
https://academic.hep.com.cn/fesci/EN/Y2020/V14/I2/462

Fig.1 Schematic of the relation between grassland carbon cycling before, during and after a drought, with the timescales being relevant to the responses and impacts (Modified From Van der Molen et al., 2011).

Fig.2 Drought impacts on terrestrial ecosystem productivity (Note: “↑” and “↓” represent increases and decreases, respectively).

Fig.3 The effects of GPP, soil temperature, and soil moisture on soil respiration.

Fig.4 Schematic of interactive mechanisms between droughts and grassland ecosystems.

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