Arid
DOI10.1029/2007JG000588
Hot spots and hot moments of carbon and nitrogen dynamics in a semiarid riparian zone
Harms, Tamara K.; Grimm, Nancy B.
通讯作者Harms, Tamara K.
来源期刊JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
ISSN0148-0227
出版年2008
卷号113期号:G1
英文摘要

Riparian ecosystems are characterized by spatial and temporal heterogeneity in physical and biological attributes, with consequences for nutrient cycling. We investigated the responses of carbon (C) and nitrogen (N) cycling processes to the hydrogeomorphic template in the riparian zone of the San Pedro River, Arizona, a large (catchment area similar to 11,500 km(2)), free-flowing, semiarid river. Over an annual period we documented spatial and temporal patterns in soil, shallow groundwater, and stream nutrient chemistry as well as rates of N-transforming processes in soils of the surface (0-17 cm) and region of seasonal saturation (RoSS). A hot moment of N retention and removal was indicated by elevated rates of microbial processes during the summer monsoon season. At the same time, elevated C was observed in soil microbial biomass for both surface soils and soils in the RoSS. Analyses of C-use profiles for soil microbes, coupled with trends in stream and shallow-groundwater chemistry, further suggest that this hot moment of N removal was fueled by newly available, labile organic material. In a spatial context, patchiness in soil resources, microbial biomass, and potential denitrification were best explained by variation in microtopography; low-elevation landscape positions were hot spots of resource availability and microbial activity. Vertical heterogeneity also corresponded with variation in the factors influencing N transformation rates. Organic matter was more frequently a significant factor explaining N transformation rates in RoSS soils whereas soil water content was more often important in surface soils. Together, these patterns suggest that understanding the points on the hydrogeomorphic template, both in space and in time, that bring together water and labile organic matter will lead to greater predictive capability regarding C and N cycling in semiarid river-riparian corridors.


类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000254166100002
WOS关键词DISSOLVED ORGANIC-CARBON ; SAN-PEDRO RIVER ; NITRATE DYNAMICS ; DESERT STREAM ; FLOODPLAIN FOREST ; LANDSCAPE ECOLOGY ; FLASH FLOODS ; ECOSYSTEM ; SOIL ; DENITRIFICATION
WOS类目Environmental Sciences ; Geosciences, Multidisciplinary
WOS研究方向Environmental Sciences & Ecology ; Geology
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/2XILL650/158223
作者单位Arizona State Univ, Sch Life Sci, Tempe, AZ 85287 USA
推荐引用方式
GB/T 7714
Harms, Tamara K.,Grimm, Nancy B.. Hot spots and hot moments of carbon and nitrogen dynamics in a semiarid riparian zone[J]. Arizona State University,2008,113(G1).
APA Harms, Tamara K.,&Grimm, Nancy B..(2008).Hot spots and hot moments of carbon and nitrogen dynamics in a semiarid riparian zone.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,113(G1).
MLA Harms, Tamara K.,et al."Hot spots and hot moments of carbon and nitrogen dynamics in a semiarid riparian zone".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 113.G1(2008).
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