干旱区生态环境知识资源中心(Arid): Ecosystem hydrologic and metabolic flashiness are shaped by plant community traits and precipitation

Arid

DOI	10.1016/j.agrformet.2019.107674
	Ecosystem hydrologic and metabolic flashiness are shaped by plant community traits and precipitation
	Potts, Daniel L.1; Barron-Gafford, Greg A.2; Scott, Russell L.3
通讯作者	Potts, Daniel L.
来源期刊	AGRICULTURAL AND FOREST METEOROLOGY
ISSN	0168-1923
EISSN	1873-2240
出版年	2019
卷号	279
英文摘要	Understanding the hydrologic and carbon cycling consequences of precipitation variability in dryland ecosystems requires improved appreciation and accounting of how above- and belowground biophysical processes differ in their response to rainfall. Our objective was to contrast the sensitivity of dryland ecosystem evapotranspiration (ET), gross ecosystem productivity (GEP), and ecosystem respiration (R-e) in response to inter- and intra-annual precipitation variability in a nearby grassland, savanna, and shrubland ecosystems in southeastern Arizona. To do this, we modified the Richards-Baker index, which quantifies the flashiness of a stream's hydrograph, to calculate analogous indices of ecosystem hydrologic and metabolic flashiness. In this way, ecosystem flashiness describes the frequency and rapidity of short-term fluctuations in H2O and CO2 exchange in response to precipitation while preserving the sequence of day-to-day variation in fluxes using tower-based time-series of daily averaged ET, GEP and R-e. We calculated annual hydrologic, GEP, and R-e flashiness (f(ET), f(GEP) and f(Re) respectively) using 6 years of daily-averaged fluxes estimated from eddy covariance. In contrast to our prediction, annual f(GEP) was consistently greater than annual f(Re). Furthermore, we predicted that increasing rooting depth would correlate with a decline in annual f(ET) and f(GEP). In fact, annual f(GEP) was similar between the grassland, savanna, and shrubland. Whereas the response of annual f(ET) and f(GEP) to annual precipitation was plant community dependent and generally declined with increasing rainfall, annual f(Re) did not vary in response to precipitation. The effect of late summer storms on f(GEP) was plant community dependent such that shrubland f(GEP) and f(Re) strongly declined in response to rainfall whereas grassland and savanna f(GEP) was relatively unresponsive. Conceptually similar to hydrologic flashiness, ecosystem flashiness may provide an additional lens through which to observe the influence of resource availability, shifts in community composition, and disturbance on ecosystem hydrologic and carbon cycling.
英文关键词	Eddy covariance NEE Rainfall variability Semi-arid Ecohydrology
类型	Article
语种	英语
国家	USA
收录类别	SCI-E
WOS记录号	WOS:000500197400004
WOS关键词	SEMIARID ECOSYSTEMS ; INTERANNUAL VARIABILITY ; SEASONAL PRECIPITATION ; SOIL RESPIRATION ; CARBON-DIOXIDE ; SONORAN DESERT ; PULSE-RESERVE ; SCALE CARBON ; WATER-VAPOR ; CO2
WOS类目	Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
EI主题词	2019-12-15
来源机构	University of Arizona
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/311754
作者单位	1.SUNY Buffalo State, Biol Dept, 1300 Elmwood Ave, Buffalo, NY 14222 USA; 2.Univ Arizona, Sch Geog & Dev, Tucson, AZ 85721 USA; 3.USDA ARS, Southwest Watershed Res Ctr, Tucson, AZ 85719 USA
推荐引用方式 GB/T 7714	Potts, Daniel L.,Barron-Gafford, Greg A.,Scott, Russell L.. Ecosystem hydrologic and metabolic flashiness are shaped by plant community traits and precipitation[J]. University of Arizona,2019,279.
APA	Potts, Daniel L.,Barron-Gafford, Greg A.,&Scott, Russell L..(2019).Ecosystem hydrologic and metabolic flashiness are shaped by plant community traits and precipitation.AGRICULTURAL AND FOREST METEOROLOGY,279.
MLA	Potts, Daniel L.,et al."Ecosystem hydrologic and metabolic flashiness are shaped by plant community traits and precipitation".AGRICULTURAL AND FOREST METEOROLOGY 279(2019).