干旱区生态环境知识资源中心(Arid): Spatio-Temporal Effect on Soil Respiration in Fine-Scale Patches in a Desert Ecosystem

Arid

DOI	10.1016/S1002-0160(06)60019-2
	Spatio-Temporal Effect on Soil Respiration in Fine-Scale Patches in a Desert Ecosystem
	S.PEN-MOURATOV; M.RAKHIMBAEV; Y.STEINBERGER
来源期刊	Pedosphere
ISSN	1002-0160
出版年	2006
卷号	16 期号:1 页码:1-9
英文摘要	Soil organisms in terrestrial systems are unevenly distributed in time and space, and often aggregated. Spatiotemporal patchiness in the soil environment is thought to be crucial for the maintenance of soil biodiversity, providing diverse microhabitats tightly interweaving with resource partitioning. Determination of a ＂scale unit＂ to help understand ecological processes has become one of the important and most debatable problems in recent years. A fieldwork was carried out in the northern Negev Desert highland, Israel to determine the influence of fine-scale landscape patch moisture heterogeneity on biogeochemical variables and microbial activity linkage in a desert ecosystem. The results showed that the spatio-temporal patchiness of soil moisture to which we attribute influential properties, was found to become more heterogenic with the decrease in soil moisture availability （from 8.2 to 0.4 g kg^-1） toward the hot, dry seasons, with coefficient of variation （CV） change amounting to 66.9%. Spatio-temporal distribution of organic matter （OM） and total soluble nitrogen （TSN） was found to be relatively uniformly distributed throughout the wet seasons （winter and spring）, with increase of relatively high heterogeneity toward the dry seasons （from 0.25% to 2.17% for OM, and from 0 to 10.2 mg kg^-1 for TSN） with CV of 47.4% and 99.7% for OM and TSN, respectively. Different spatio-temporal landscape patterns were obtained for Ca （CV = 44.6%）, K （CV = 34.4%）, and Na （CV = 92%） ions throughout the study period. CO2 evolution （CV = 48.6%） was found to be of lower heterogeneity （varying between 2 and 39 g CO2-C g^-1 dry soil h^-1） in the moist seasons, e.g., winter and spring, with lower values of respiration coupled with high heterogeneity of Na^＋ and low levels of TSN and organic matter content, and with more homogeneity in the dry seasons （varying between 1 and 50 g CO2-C g^-1 dry soil h^-1）. Our results elucidate the heterogeneity and complexity of desert system habitats affecting soil biota activity.
英文关键词	desert microbial respiration patchiness small-scale habitat soil
类型	Article
语种	英语
收录类别	CSCD
WOS研究方向	Agriculture
CSCD记录号	CSCD:2621165
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/334924
作者单位	S.PEN-MOURATOV, Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan.; M.RAKHIMBAEV, Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan.; Y.STEINBERGER, Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan.
推荐引用方式 GB/T 7714	S.PEN-MOURATOV,M.RAKHIMBAEV,Y.STEINBERGER. Spatio-Temporal Effect on Soil Respiration in Fine-Scale Patches in a Desert Ecosystem[J],2006,16(1):1-9.
APA	S.PEN-MOURATOV,M.RAKHIMBAEV,&Y.STEINBERGER.(2006).Spatio-Temporal Effect on Soil Respiration in Fine-Scale Patches in a Desert Ecosystem.Pedosphere,16(1),1-9.
MLA	S.PEN-MOURATOV,et al."Spatio-Temporal Effect on Soil Respiration in Fine-Scale Patches in a Desert Ecosystem".Pedosphere 16.1(2006):1-9.