Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1007/s10533-008-9195-6 |
Effects of wind erosion on the spatial heterogeneity of soil nutrients in two desert grassland communities | |
Li, Junran1; Okin, Gregory S.2; Alvarez, Lorelei1; Epstein, Howard1 | |
通讯作者 | Li, Junran |
来源期刊 | BIOGEOCHEMISTRY |
ISSN | 0168-2563 |
EISSN | 1573-515X |
出版年 | 2008 |
卷号 | 88期号:1页码:73-88 |
英文摘要 | Wind is known to affect the spatial heterogeneity of soil resources in arid and semiarid systems, but multi-year, quantified observations are largely absent. We studied the effects of wind erosion on the spatial distribution of soil organic carbon (SOC) and other soil nutrients at the Jornada Experimental Range, in southern New Mexico. Enhanced wind erosion was encouraged by grass cover reduction in a Sporobolus-mesquite dominated site (SM) and a Bouteloua-mesquite dominated site (BM). The scale and magnitude of spatial dependence for the soil analytes were quantified using geostatistical analyses. Results of this study show that soil organic matter related analytes such as SOC, TN, N-avail, and SO42 are among the first to be eroded and redistributed; cations such as Ca2+ and Mg2+ may not be removed and redistributed significantly; and other ions such as K+, Na+ and Cl- showed no discernible pattern of change. Geostatistics show that wind appeared to increase the scale of spatial autocorrelation, but decrease the scale of spatial dependence of most soil analytes over 2-3 windy seasons. In the wind enhanced plot of the SM site, up to 99% of the spatial dependence of SOC was autocorrelated at the distance of 1.45 m before the initiation of wind erosion, but the spatial dependence dropped significantly to only 60% at a larger autocorrelation distance of 2.76 m after three windy seasons. Similar but less significant changes were observed for SOC in the BM site. Despite the differential effects of wind on the soil analytes, we conclude that the overall results of wind on the grass cover reduction plots are the disappearance of small, strong fertile islands, which may be related to grasses; and the reinforcement of large fertile islands, which are likely related to mesquite shrubs. In addition, the change of the spatial patterns of SOC and other soil nutrients induced by enhanced wind erosion may persist and reinforce soil islands associated with shrubs, thus allowing a positive feedback for further desertification in this arid grassland. |
英文关键词 | spatial heterogeneity soil nutrients soil carbon soil nitrogen wind erosion geostatistics |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000256263600006 |
WOS关键词 | CATION-EXCHANGE CAPACITY ; SAGEBRUSH STEPPE LANDSCAPE ; SOUTHERN NEW-MEXICO ; TEMPORAL VARIATION ; SONORAN DESERT ; NITROGEN ; ECOSYSTEMS ; MICROTOPOGRAPHY ; AVAILABILITY ; VEGETATION |
WOS类目 | Environmental Sciences ; Geosciences, Multidisciplinary |
WOS研究方向 | Environmental Sciences & Ecology ; Geology |
来源机构 | University of California, Los Angeles |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/156663 |
作者单位 | 1.Univ Virginia, Dept Environm Sci, Charlottesville, VA 22904 USA; 2.Univ Calif Los Angeles, Dept Geog, Los Angeles, CA 90095 USA |
推荐引用方式 GB/T 7714 | Li, Junran,Okin, Gregory S.,Alvarez, Lorelei,et al. Effects of wind erosion on the spatial heterogeneity of soil nutrients in two desert grassland communities[J]. University of California, Los Angeles,2008,88(1):73-88. |
APA | Li, Junran,Okin, Gregory S.,Alvarez, Lorelei,&Epstein, Howard.(2008).Effects of wind erosion on the spatial heterogeneity of soil nutrients in two desert grassland communities.BIOGEOCHEMISTRY,88(1),73-88. |
MLA | Li, Junran,et al."Effects of wind erosion on the spatial heterogeneity of soil nutrients in two desert grassland communities".BIOGEOCHEMISTRY 88.1(2008):73-88. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。