Arid
DOI10.1890/06-1933.1
The influence of drainage networks on patterns of soil respiration in a desert catchment
Sponseller, Ryan A.; Fisher, Stuart G.
通讯作者Sponseller, Ryan A.
来源期刊ECOLOGY
ISSN0012-9658
EISSN1939-9170
出版年2008
卷号89期号:4页码:1089-1100
英文摘要

Hydrologic flow and connectivity act as important determinants of ecological pattern and process in heterogeneous landscapes. Here we examine how the routing of water through the drainage network of an upper Sonoran Desert basin influences landscape patterns of soil respiration (SR) at both seasonal and event-based timescales. At seasonal timescales, SR varied up to 13-fold with downstream position in the drainage network, and annual estimates of CO2 efflux ranged from 185 g C.m(-2).yr(-1) to 1190 g C.m(-2).yr(-1) for sites arrayed along the same flow path. Spatial patterns of SR were unrelated to the carbon and water content of surface soils, but rather tracked changes in plant size and productivity, which in turn reflect downstream increases in groundwater availability. The relative importance of precipitation and temperature as drivers of SR also changed with landscape position, with the latter becoming more important in downstream locations. At the scale of individual precipitation events, SR increased up to 30-fold upon rewetting but typically returned to background levels within 24 h, even when soil moisture remained elevated. Unlike patterns observed at seasonal scales, event-based losses of CO2 varied across the landscape as a function of the organic-matter content in surface soils. Results from labile carbon amendments confirm that CO2 losses following precipitation pulses are initially constrained by substrate availability, not soil drying. By mediating spatial patterns of vegetation structure and soil resource availability, drainage networks represent an important physical template upon which belowground processes are organized in desert basins.


英文关键词hydrologic flow paths landscape position pulse dynamics soil respiration Sonoran Desert stream networks
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000255580200023
WOS关键词PRECIPITATION PULSES ; SEMIARID ECOSYSTEMS ; MICROBIAL BIOMASS ; SPATIAL VARIATION ; CO2 EFFLUX ; CARBON ; WATER ; LANDSCAPE ; FOREST ; STREAM
WOS类目Ecology
WOS研究方向Environmental Sciences & Ecology
来源机构Arizona State University
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/157085
作者单位Arizona State Univ, Sch Life Sci, Tempe, AZ 85287 USA
推荐引用方式
GB/T 7714
Sponseller, Ryan A.,Fisher, Stuart G.. The influence of drainage networks on patterns of soil respiration in a desert catchment[J]. Arizona State University,2008,89(4):1089-1100.
APA Sponseller, Ryan A.,&Fisher, Stuart G..(2008).The influence of drainage networks on patterns of soil respiration in a desert catchment.ECOLOGY,89(4),1089-1100.
MLA Sponseller, Ryan A.,et al."The influence of drainage networks on patterns of soil respiration in a desert catchment".ECOLOGY 89.4(2008):1089-1100.
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