Arid
DOI10.1007/s10021-013-9675-y
Consequences of Cool-Season Drought-Induced Plant Mortality to Chihuahuan Desert Grassland Ecosystem and Soil Respiration Dynamics
Hamerlynck, Erik P.1; Scott, Russell L.1; Barron-Gafford, Greg A.2
通讯作者Hamerlynck, Erik P.
来源期刊ECOSYSTEMS
ISSN1432-9840
EISSN1435-0629
出版年2013
卷号16期号:7页码:1178-1191
英文摘要

Predicted reductions of cool-season rainfall may expand and accelerate drought-induced plant mortality currently unfolding across the Southwest US. To assess how repeated plant mortality affects ecosystem functional attributes, we quantified net ecosystem CO2 exchange (NEE), ecosystem respiration (R (eco)), and gross ecosystem photosynthesis (GEP) responses to precipitation (P) at a semidesert grassland over spring (Feb 1-Apr 30) and summer (June 15-Oct 1) plant-active periods across eight years, including two with distinct patterns of extensive species-specific mortality. In addition, we quantified daily soil respiration (R (soil)) in high- (56-88%) and low-mortality (8-27%) plots the summer following the most recent mortality event. Plant mortality coincided with severely dry cool-season conditions (Dec 1-Apr 30). We found a positive relationship between springtime P and GEP, and that springtime conditions influenced GEP response to summer rainfall. High springtime R (eco)/GEP ratios followed plant mortality, suggesting increased available carbon after mortality was rapidly decomposed. R (soil) in low-mortality plots exceeded high-mortality plots over drier summer periods, likely from more root respiration. However, total cumulative R (soil) did not differ between plots, as variation in surviving plant conditions resulted in high and low C-yielding plots within both plot types. Vegetation status in high C-yielding R (soil) plots was similar to that across the grassland, suggesting R (soil) from such areas underlay higher R (eco). This, coupled to springtime drought constraints to GEP, resulted in positive NEE under summer P accumulations that previously supported C-sink activity. These findings indicate that predicted lower cool-season precipitation may strongly and negatively affect summer season productivity in these semiarid grasslands.


英文关键词climate change ecosystem respiration gross ecosystem photosynthesis net ecosystem carbon dioxide exchange seasonal precipitation soil moisture southern oscillation/El Nino
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000325424500002
WOS关键词CARBON-DIOXIDE EXCHANGE ; NET PRIMARY PRODUCTION ; PRECIPITATION PULSES ; CO2 FLUX ; BIOMASS PRODUCTION ; SONORAN DESERT ; GAS-EXCHANGE ; CLIMATE ; WATER ; MOISTURE
WOS类目Ecology
WOS研究方向Environmental Sciences & Ecology
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/2XILL650/176800
作者单位1.ARS, USDA, Southwest Watershed Res Ctr, Tucson, AZ 85719 USA;
2.Univ Arizona, Earthsci B2, Tucson, AZ 85721 USA
推荐引用方式
GB/T 7714
Hamerlynck, Erik P.,Scott, Russell L.,Barron-Gafford, Greg A.. Consequences of Cool-Season Drought-Induced Plant Mortality to Chihuahuan Desert Grassland Ecosystem and Soil Respiration Dynamics[J]. University of Arizona,2013,16(7):1178-1191.
APA Hamerlynck, Erik P.,Scott, Russell L.,&Barron-Gafford, Greg A..(2013).Consequences of Cool-Season Drought-Induced Plant Mortality to Chihuahuan Desert Grassland Ecosystem and Soil Respiration Dynamics.ECOSYSTEMS,16(7),1178-1191.
MLA Hamerlynck, Erik P.,et al."Consequences of Cool-Season Drought-Induced Plant Mortality to Chihuahuan Desert Grassland Ecosystem and Soil Respiration Dynamics".ECOSYSTEMS 16.7(2013):1178-1191.
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