气候变化领域集成服务门户(CCPortal): Drying and rewetting effects on C and N mineralization and microbial activity in surface and subsurface California grassland soils

CCPortal

DOI	10.1016/j.soilbio.2008.05.004
	Drying and rewetting effects on C and N mineralization and microbial activity in surface and subsurface California grassland soils
	Xiang, Shu-Rong; Doyle, Allen; Holden, Patricia A.; Schimel, Joshua P.
通讯作者	Schimel, JP (通讯作者)
发表日期	2008
ISSN	0038-0717
起始页码	2281
结束页码	2289
卷号	40 期号:9
英文摘要	Rewetting a dry soil has long been known to cause a burst of respiration (the Birch Effect). Hypothesized mechanisms for this involve: (1) release of cellular materials as a result of the rapid increase in water potential stress and (2) stimulating C-supply to microbes via physical processes. The balance of these factors is still not well understood, particularly in the contexts of multiple dry/wet cycles and of how resource and stress patterns vary through the soil profile. We evaluated the effects of multiple dry/wet cycles on surface and subsurface soils from a California annual grassland. Treatments included 4, 6, and 12 cycles that varied the length of the drying period between rewetting events. Respiration was monitored after each wetting event while extractable C and N, microbial biomass, and microbial activity were assayed initially, after the first rewetting event, and at the end of the experiment. Initially, microbial biomass and activity (respiration, dehydrogenase, and N mineralization) in subsurface soils were ca. 10% and 20% of surface soil levels. After multiple cycles, however, subsurface soil microbial biomass and activity were enhanced by up to 8-fold, even in comparison to the constantly moist treatment. By comparison, surface soil microbial biomass and activity were either moderately (i.e. 1.5 times increase) or not affected by wetting and drying. Drying and rewetting led to a cascade of responses (soluble C release, biomass growth, and enhanced activity) that mobilized and metabolized otherwise unavailable soil carbon, particularly in subsurface soils. (C) 2008 Elsevier Ltd. All rights reserved.
关键词	ORGANIC-MATTER CARBON NITROGEN BIOMASS RESPIRATION FOREST DENITRIFICATION NITRIFICATION STABILITY AGGREGATE
英文关键词	dry/wet cycles; subsurface; microbial biomass; respiration; stress; C and N mineralization; dehydrogenase activity
语种	英语
WOS研究方向	Agriculture
WOS类目	Soil Science
WOS记录号	WOS:000259341500029
来源期刊	SOIL BIOLOGY & BIOCHEMISTRY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/257565
推荐引用方式 GB/T 7714	Xiang, Shu-Rong,Doyle, Allen,Holden, Patricia A.,et al. Drying and rewetting effects on C and N mineralization and microbial activity in surface and subsurface California grassland soils[J]. 中国科学院青藏高原研究所,2008,40(9).
APA	Xiang, Shu-Rong,Doyle, Allen,Holden, Patricia A.,&Schimel, Joshua P..(2008).Drying and rewetting effects on C and N mineralization and microbial activity in surface and subsurface California grassland soils.SOIL BIOLOGY & BIOCHEMISTRY,40(9).
MLA	Xiang, Shu-Rong,et al."Drying and rewetting effects on C and N mineralization and microbial activity in surface and subsurface California grassland soils".SOIL BIOLOGY & BIOCHEMISTRY 40.9(2008).