Arid
DOI10.1890/06-1580.1
Climatic/edaphic controls on soil carbon/nitrogen response to shrub encroachment in desert grassland
Wheeler, C. Winston; Archer, Steven R.; Asner, Gregory P.; McMurtry, Chad R.
通讯作者Archer, Steven R.
来源期刊ECOLOGICAL APPLICATIONS
ISSN1051-0761
出版年2007
卷号17期号:7页码:1911-1928
英文摘要

The proliferation of woody plants in grasslands over the past 100+ years can alter carbon, nitrogen, and water cycles and influence land surface-atmosphere interactions. Although the majority of organic carbon in these ecosystems resides belowground, there is no consensus on how this change in land cover has affected soil organic carbon (SOC) and total nitrogen (TN) pools. The degree to which duration of woody plant occupation, climate, and edaphic conditions have mediated SOC and TN responses to changes in life-form composition are poorly understood. We addressed these issues at a desert grassland site in Arizona, USA, where the leguminous shrub velvet mesquite (Prosopis velutina) has proliferated along an elevation/precipitation/temperature gradient and on contrasting soil morphologic surfaces.


On sandy loam complexes of mid-Holocene origin, mean SOC and TN of soils in the grassland matrix increased similar to 68% and similar to 45%, respectively, with increasing elevation. Soil organic carbon pools were comparable and TN pools were similar to 23% higher in Pleistocene-aged clay loam complexes co-occurring with Holocene-aged soils at the upper elevation/climatic zone. Across the site, belowground resources associated with large Prosopis plants were 21-154% (SOC) and 18-127% (TN) higher than those in the grassy matrix.


The variance in SOC and TN pools accounted for by Prosopis stem size (a rough surrogate for time of site occupation) was highest at the low- and mid-elevation sites (69-74%) and lowest at the upper elevation site (32-38%). Soil delta(15)N values ranged from 5.5 parts per thousand to 6.7 parts per thousand across the soil/elevation zones but were comparable in herbaceous and shrub-impacted soils and exhibited a weak relationship with Prosopis basal stem diameter (r(2) < 0. 1) and TN (r(2) < 0.08). The SOC delta(13)C values decreased linearly with increasing Prosopis basal diameter, suggesting that size and isotopic composition of the SOC pool is a function of time of Prosopis site occupation. Isotopic mixture models indicate that encroachment Of C(3) woody plants has also promoted. SOC additions from C(4) plant sources, indicative of long-term herbaceous facilitation. Grassy sites in contrasting soil/elevation combinations, initially highly distinctive in their SOC pool size and delta(13)C, appear to be converging on similar values following similar to 100 years of woody plant proliferation.


英文关键词carbon cycle carbon isotopes carbon sequestration mesquite Prosopis velutina Santa Rita Experimental Range Arizona USA soil nitrogen soil organic carbon Sonoran Desert (13)C woody plant encroachment
类型Review
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000250142500006
WOS关键词SUBTROPICAL SAVANNA ECOSYSTEM ; MESQUITE PROSOPIS-GLANDULOSA ; WOODY PLANT ENCROACHMENT ; SOUTHERN NEW-MEXICO ; LAND-USE CHANGE ; ORGANIC-MATTER ; CARBON STORAGE ; NATURAL-ABUNDANCE ; UNITED-STATES ; UNDERSTOREY VEGETATION
WOS类目Ecology ; Environmental Sciences
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/2XILL650/153977
作者单位(1)Univ Arizona, Sch Nat Resources, Tucson, AZ 85721 USA;(2)Stanford Univ, Dept Geol & Environm Sci, Stanford, CA 94305 USA;(3)Carnegie Inst Washington, Dept Global Ecol, Stanford, CA 94305 USA
推荐引用方式
GB/T 7714
Wheeler, C. Winston,Archer, Steven R.,Asner, Gregory P.,et al. Climatic/edaphic controls on soil carbon/nitrogen response to shrub encroachment in desert grassland[J]. University of Arizona,2007,17(7):1911-1928.
APA Wheeler, C. Winston,Archer, Steven R.,Asner, Gregory P.,&McMurtry, Chad R..(2007).Climatic/edaphic controls on soil carbon/nitrogen response to shrub encroachment in desert grassland.ECOLOGICAL APPLICATIONS,17(7),1911-1928.
MLA Wheeler, C. Winston,et al."Climatic/edaphic controls on soil carbon/nitrogen response to shrub encroachment in desert grassland".ECOLOGICAL APPLICATIONS 17.7(2007):1911-1928.
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