干旱区生态环境知识资源中心(Arid): Post-fire Redistribution of Soil Carbon and Nitrogen at a Grassland-Shrubland Ecotone

Arid

DOI	10.1007/s10021-018-0260-2
	Post-fire Redistribution of Soil Carbon and Nitrogen at a Grassland-Shrubland Ecotone
	Wang, Guan 1; Li, Junran 1; Ravi, Sujith 2; Dukes, David 2; Gonzales, Howell B.2; Sankey, Joel B.3
通讯作者	Wang, Guan
来源期刊	ECOSYSTEMS
ISSN	1432-9840
EISSN	1435-0629
出版年	2019
卷号	22 期号:1 页码:174-188
英文摘要	The rapid conversion of grasslands into shrublands has been observed in many arid and semiarid regions worldwide. Studies have shown that fire can negatively affect shrub communities and promote resource homogenization, thereby providing some reversibility to the resource heterogeneity induced by shrub encroachment, especially in the early stages of encroachment. Here, we used prescribed fire in a grassland-shrubland transition zone in the northern Chihuahuan Desert to test the hypothesis that fire facilitates the remobilization of nutrient-enriched soil from shrub microsites to grass and bare microsites and thereby reduces the spatial heterogeneity of soil resources. Results show that the shrub microsites had the lowest water content compared to grass and bare microsites after fire, even when rain events occurred. Significant differences of total soil carbon (TC) and total soil nitrogen (TN) among the three microsites were not detected 1year after the fire. The spatial autocorrelation distance increased from 1 to 2m, approximately the mean diameter of an individual shrub canopy, to over 5m 1year after the fire for TC and TN. Patches of high soil C and N decomposed 1year after the prescribed fire. Overall, fire stimulates the redistribution of soil C and N from shrub microsites to nutrient-depleted grass and bare microsites, leading to a decrease in spatial heterogeneity of these elements. The redistribution of soil C and N from shrub to grass and bare microsites, coupled with the reduced soil water content under the shrub canopies but not in grass and bare microsites, suggests that fire might influence the competition between shrubs and grasses, leading to a higher grass, compared to shrub, coverage in this ecotone.
英文关键词	shrub encroachment wildfire spatial heterogeneity soil redistribution microsites geostatistics
类型	Article
语种	英语
国家	USA
收录类别	SCI-E
WOS记录号	WOS:000458503300013
WOS关键词	SOUTHERN NEW-MEXICO ; DESERT GRASSLAND ; AEOLIAN SEDIMENT ; WIND EROSION ; FIRE ; VEGETATION ; TRANSPORT ; HETEROGENEITY ; ENCROACHMENT ; NUTRIENTS
WOS类目	Ecology
WOS研究方向	Environmental Sciences & Ecology
来源机构	United States Geological Survey
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/215324
作者单位	1.Univ Tulsa, Dept Geosci, Tulsa, OK 74104 USA; 2.Temple Univ, Dept Earth & Environm Sci, Philadelphia, PA 19122 USA; 3.US Geol Survey, Grand Canyon Monitoring & Res Ctr, Southwest Biol Sci Ctr, Flagstaff, AZ 86001 USA
推荐引用方式 GB/T 7714	Wang, Guan,Li, Junran,Ravi, Sujith,et al. Post-fire Redistribution of Soil Carbon and Nitrogen at a Grassland-Shrubland Ecotone[J]. United States Geological Survey,2019,22(1):174-188.
APA	Wang, Guan,Li, Junran,Ravi, Sujith,Dukes, David,Gonzales, Howell B.,&Sankey, Joel B..(2019).Post-fire Redistribution of Soil Carbon and Nitrogen at a Grassland-Shrubland Ecotone.ECOSYSTEMS,22(1),174-188.
MLA	Wang, Guan,et al."Post-fire Redistribution of Soil Carbon and Nitrogen at a Grassland-Shrubland Ecotone".ECOSYSTEMS 22.1(2019):174-188.