Contrasting responses of gross primary productivity to precipitation events in a water-limited and a temperature-limited grassland ecosystem

doi:10.1016/jagrformet.2015.08.251

NWIPB OpenIR

	Contrasting responses of gross primary productivity to precipitation events in a water-limited and a temperature-limited grassland ecosystem
	Guo, Qun 1; Hu, Zhongmin 1; Li, Shenggong 1; Yu, Guirui 1; Sun, Xiaomin 1; Zhang, Leiming 1; Mu, Songlin 2; Zhu, Xianjin 1; Wang, Yanfen 3; Li, Yingnian 4; Zhao, Wei 1,3
	2015-12-15
发表期刊	AGRICULTURAL AND FOREST METEOROLOGY
卷号	214 页码:169-177
文章类型	Article
摘要	The impact of global climate change on precipitation regimes may bring about significant consequences to the productivity of grassland ecosystems. This study reports the effects of the characteristics of precipitation events (PEC, e.g., size, frequency, interval, and seasonal distribution of precipitation events) on gross primary productivity (GPP) based on long-term measurements of net ecosystem CO2 exchange and evapotranspiration by the eddy covariance technique in a water-limited temperate steppe in Inner Mongolia and a humid but temperature-limited alpine meadow in Tibet, China. We determined that the predominant characteristics of precipitation events that affected GPP differed remarkably between these two ecosystems. The number of heavy precipitation events (>10 mm day(-1)) was the most important PEC to impact GPP in the temperate steppe. Years with more frequent heavy precipitation events favored higher GPP. However, in contrast with the case in the temperate steppe, precipitation interval was the factor that affected GPP most in the alpine meadow. GPP was higher as the precipitation intervals lengthened or their distribution shifted to fewer but longer intervals (concentrated distribution). Additionally, the mechanisms for the effects of PEC on GPP also differed between these two ecosystems. Compared with small events, heavy precipitation events recharged deeper soil layers in the temperate steppe, which was biologically more meaningful for plant transpiration (i.e., an increase in the ratio of transpiration to evapotranspiration), relief from drought stress (an increase in the duration of high soil water content), and thereby higher GPP. In contrast, mean air temperature was higher in the alpine meadow when the precipitation intervals increased or their distribution was more concentrated, leading to a longer period of higher temperature that was favorable to higher GPP. Our results imply that soil water is not the exclusive means of revealing the mechanism of precipitation affecting productivity; the corresponding changes in temperature along with precipitation events may also play a substantial role in temperature-limited grasslands. (C) 2015 Elsevier B.V. All rights reserved.; The impact of global climate change on precipitation regimes may bring about significant consequences to the productivity of grassland ecosystems. This study reports the effects of the characteristics of precipitation events (PEC, e.g., size, frequency, interval, and seasonal distribution of precipitation events) on gross primary productivity (GPP) based on long-term measurements of net ecosystem CO2 exchange and evapotranspiration by the eddy covariance technique in a water-limited temperate steppe in Inner Mongolia and a humid but temperature-limited alpine meadow in Tibet, China. We determined that the predominant characteristics of precipitation events that affected GPP differed remarkably between these two ecosystems. The number of heavy precipitation events (>10 mm day(-1)) was the most important PEC to impact GPP in the temperate steppe. Years with more frequent heavy precipitation events favored higher GPP. However, in contrast with the case in the temperate steppe, precipitation interval was the factor that affected GPP most in the alpine meadow. GPP was higher as the precipitation intervals lengthened or their distribution shifted to fewer but longer intervals (concentrated distribution). Additionally, the mechanisms for the effects of PEC on GPP also differed between these two ecosystems. Compared with small events, heavy precipitation events recharged deeper soil layers in the temperate steppe, which was biologically more meaningful for plant transpiration (i.e., an increase in the ratio of transpiration to evapotranspiration), relief from drought stress (an increase in the duration of high soil water content), and thereby higher GPP. In contrast, mean air temperature was higher in the alpine meadow when the precipitation intervals increased or their distribution was more concentrated, leading to a longer period of higher temperature that was favorable to higher GPP. Our results imply that soil water is not the exclusive means of revealing the mechanism of precipitation affecting productivity; the corresponding changes in temperature along with precipitation events may also play a substantial role in temperature-limited grasslands. (C) 2015 Elsevier B.V. All rights reserved.
关键词	Precipitation Event Gross Primary Productivity Grassland Ecosystem Global Climate Change Temperate Steppe In Inner Mongolia AlpIne Meadow In Tibet
WOS标题词	Science & Technology ; Life Sciences & Biomedicine ; Physical Sciences
DOI	10.1016/jagrformet.2015.08.251
关键词[WOS]	LEYMUS-CHINENSIS STEPPE ; NET PRIMARY PRODUCTION ; SEMIARID GRASSLAND ; SHORTGRASS STEPPE ; MODELING ANALYSIS ; RAINFALL REGIMES ; INNER-MONGOLIA ; USE EFFICIENCY ; CO2 EXCHANGE ; VARIABILITY
收录类别	SCI
语种	英语
项目资助者	National Natural Science Foundation of China(31400425 ; Youth Innovation Promotion Association, CAS(2015037) ; Funding for talented young scientists of IGSNRR(2013RC203) ; National Key Project of Scientific and Technical Supporting Program(2013BAC03B03) ; Beijing Social Foundation of China(15JGC193) ; 31570437 ; 41301043 ; 31420103917)
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
WOS类目	Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000364730000016
引用统计	被引频次：78[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/5485
专题	中国科学院西北高原生物研究所
作者单位	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Synth Res Ctr Chinese Ecosyst Res Network, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China 2.Beijing Acad Social Sci, Beijing 100120, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Chinese Acad Sci, Northwest Plateau Inst Biol, Xining 810001, Peoples R China
推荐引用方式 GB/T 7714	Guo, Qun,Hu, Zhongmin,Li, Shenggong,et al. Contrasting responses of gross primary productivity to precipitation events in a water-limited and a temperature-limited grassland ecosystem[J]. AGRICULTURAL AND FOREST METEOROLOGY,2015,214:169-177.
APA	Guo, Qun.,Hu, Zhongmin.,Li, Shenggong.,Yu, Guirui.,Sun, Xiaomin.,...&Zhao, Wei.(2015).Contrasting responses of gross primary productivity to precipitation events in a water-limited and a temperature-limited grassland ecosystem.AGRICULTURAL AND FOREST METEOROLOGY,214,169-177.
MLA	Guo, Qun,et al."Contrasting responses of gross primary productivity to precipitation events in a water-limited and a temperature-limited grassland ecosystem".AGRICULTURAL AND FOREST METEOROLOGY 214(2015):169-177.