干旱区生态环境知识资源中心(Arid): Fire changes the spatial distribution and sources of soil organic carbon in a grassland-shrubland transition zone

Arid

DOI	10.1007/s11104-018-3895-z
	Fire changes the spatial distribution and sources of soil organic carbon in a grassland-shrubland transition zone
	Wang, Guan 1; Li, Junran 1; Ravi, Sujith 2; Theiling, Bethany P.1; Sankey, Joel B.3
通讯作者	Wang, Guan
来源期刊	PLANT AND SOIL
ISSN	0032-079X
EISSN	1573-5036
出版年	2019
卷号	435 期号:1-2 页码:309-321
英文摘要	AimsIn many mixed grass-shrub ecosystems, increased shrub biomass tends to promote overall carbon storage, but the distribution of carbon pools may be complicated by disturbances such as wildfires. We investigated the spatial distribution of surface soil organic carbon (SOC) and its relative contribution from grasses and shrubs after fires in a grass-shrub transition zone in the northern Chihuahuan Desert, USA.MethodsWe used a prescribed fire to create a burned treatment, then collected soil and plant samples. The biogeochemical approaches, geostatistical analyses, and carbon partitioning analyses were used to quantify the SOC and soil C-13 spatial patterns.ResultsBefore the prescribed fire, up to 98% of the spatial dependence of SOC was autocorrelated at a distance of 1.91m, corresponding to the approximate average shrub canopy diameter, but the spatial dependence dropped to 81% at a larger autocorrelation distance (3.74m) two windy seasons after the fire. C-4 grasses and C-3 shrubs contributed approximately equal amounts of carbon to the surface SOC pool before the prescribed fire. However, C-4 grasses became the dominant source of SOC two windy seasons following the fire. For individual microsites, a substantially increased proportion of SOC was derived from C-4 grasses at the shrub microsites following the fire.ConclusionsThe higher proportion of C-4 grasses-derived SOC at the shrub microsites post-fire suggests that SOC may have preferred pathways to move among different microsites following fire disturbance. The distinct spatial distribution patterns of C-13, and the increased contribution of SOC from grasses may be explained by the rapid recovery of grasses following the fire. Overall, our results provide insights into how fire might be used as a management tool to alter soil carbon pools in the context of shrub encroachment.
英文关键词	Prescribed fire Soil organic carbon Soil C-13 Carbon source partitioning Microsite
类型	Article
语种	英语
国家	USA
收录类别	SCI-E
WOS记录号	WOS:000458878100021
WOS关键词	WOODY PLANT ENCROACHMENT ; DELTA-C-13 VALUES ; VEGETATION CHANGE ; SAGEBRUSH STEPPE ; PYROGENIC CARBON ; DESERT ; HETEROGENEITY ; ISOTOPES ; WILDFIRE ; NITROGEN
WOS类目	Agronomy ; Plant Sciences ; Soil Science
WOS研究方向	Agriculture ; Plant Sciences
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/2XILL650/217994
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, Southwest Biol Sci Ctr, Grand Canyon Monitoring & Res Ctr, Flagstaff, AZ 86001 USA
推荐引用方式 GB/T 7714	Wang, Guan,Li, Junran,Ravi, Sujith,et al. Fire changes the spatial distribution and sources of soil organic carbon in a grassland-shrubland transition zone[J]. United States Geological Survey,2019,435(1-2):309-321.
APA	Wang, Guan,Li, Junran,Ravi, Sujith,Theiling, Bethany P.,&Sankey, Joel B..(2019).Fire changes the spatial distribution and sources of soil organic carbon in a grassland-shrubland transition zone.PLANT AND SOIL,435(1-2),309-321.
MLA	Wang, Guan,et al."Fire changes the spatial distribution and sources of soil organic carbon in a grassland-shrubland transition zone".PLANT AND SOIL 435.1-2(2019):309-321.