Arid
DOI10.1016/j.soilbio.2007.03.015
Heterogeneity of soil nutrients and subsurface biota in a dryland ecosystem
Housman, David C.; Yeager, Chris M.; Darby, Brian J.; Sanford, Robert L., Jr.; Kuske, Cheryl R.; Neher, Deborah A.; Belnap, Jayne
通讯作者Housman, David C.
来源期刊SOIL BIOLOGY & BIOCHEMISTRY
ISSN0038-0717
出版年2007
卷号39期号:8页码:2138-2149
英文摘要

Dryland ecosystems have long been considered to have a highly heterogeneous distribution of nutrients and soil biota, with greater concentrations of both in soils under plants relative to interspace soils. We examined the distribution of soil resources in two plant communities (dominated by either the shrub Coleogyne ramosissima or the grass Stipa hymenoides) at two locations. Interspace soils were covered either by early successional biological soil crusts (BSCs) or by later successional BSCs (dominated by nitrogen (N)-fixing cyanobacteria and lichens). For each of the 8 plant type x crust type x locations, we sampled the stem, dripline, and 3 interspace distances around each of 3 plants. Soil analyses revealed that only available potassium (K(av)) and ammonium concentrations were consistently greater under plants (7 of 8 sites and 6 of 8 sites, respectively). Nitrate and iron (Fe) were greater under plants at 4 sites, while all other nutrients were greater under plants at less than 50% of the sites. In contrast, calcium, copper, clay, phosphorus (P), and zinc were often greater in the interspace than under the plants. Soil microbial biomass was always greater under the plant compared to the interspace. The community composition of N-fixing bacteria was highly variable, with no distinguishable patterns among microsites. Bacterivorous nematodes and rotifers were consistently more abundant under plants (8 and 7 sites, respectively), and fungivorous and omnivorous nematodes were greater under plants at 5 of the 8 sites. Abundance of other soil biota was greater under plants at less than 50% of the sites, but highly correlated with the availability of N, P, K(av), and Fe. Unlike other ecosystems, the soil biota was only infrequently correlated with organic matter. Lack of plant-driven heterogeneity in soils of this ecosystem is likely due to (1) interspace soils covered with BSCs, (2) little incorporation of above-ground plant litter into soils, and/or (3) root deployment patterns. (C) 2007 Elsevier Ltd. All rights reserved.


英文关键词biological soil crust islands of fertility soil chemistry soil fauna soil food webs
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000247295800030
WOS关键词SHRUB-STEPPE ECOSYSTEM ; DESERT ECOSYSTEMS ; MICROBIAL BIOMASS ; CHIHUAHUAN DESERT ; CHEMICAL-PATTERNS ; RESOURCE ISLANDS ; NITROGEN ; DIVERSITY ; SAGEBRUSH ; BACTERIAL
WOS类目Soil Science
WOS研究方向Agriculture
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/2XILL650/156034
作者单位(1)US Geol Survey, Canyonlands Res Stn, Moab, UT 84532 USA;(2)Los Alamos Natl Lab, Biosci Div, Los Alamos, NM 87545 USA;(3)Univ Toledo, Dept Earth Ecol & Environm Sci, Toledo, OH 43606 USA;(4)Univ Denver, Dept Biol Sci, Denver, CO 80208 USA;(5)Savannah River Natl Lab, Environm Biotechnol Sect, Aiken, SC 29808 USA;(6)Univ Vermont, Dept Plant & Soil Sci, Burlington, VT 05405 USA
推荐引用方式
GB/T 7714
Housman, David C.,Yeager, Chris M.,Darby, Brian J.,et al. Heterogeneity of soil nutrients and subsurface biota in a dryland ecosystem[J]. United States Geological Survey,2007,39(8):2138-2149.
APA Housman, David C..,Yeager, Chris M..,Darby, Brian J..,Sanford, Robert L., Jr..,Kuske, Cheryl R..,...&Belnap, Jayne.(2007).Heterogeneity of soil nutrients and subsurface biota in a dryland ecosystem.SOIL BIOLOGY & BIOCHEMISTRY,39(8),2138-2149.
MLA Housman, David C.,et al."Heterogeneity of soil nutrients and subsurface biota in a dryland ecosystem".SOIL BIOLOGY & BIOCHEMISTRY 39.8(2007):2138-2149.
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