Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1007/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
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ISSN | 1432-9840 |
EISSN | 1435-0629 |
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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