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	Soil biophysical controls over rice straw decomposition and sequestration in soil: The effects of drying intensity and frequency of drying and wetting cycles
	Yao, Shui-Hong1,3; Zhang, Bin1,2; Hu, Feng3
刊名	SOIL BIOLOGY & BIOCHEMISTRY
	2011-03-01
卷号	43期号:3页码:590-599
关键词	Wetting and drying cycles Microbial biomass Microbial community Organic matter decomposition Soil pore-size distribution Soil aggregation Soil water repellency
ISSN号	0038-0717
DOI	10.1016/j.soilbio.2010.11.027
通讯作者	Zhang, Bin(bzhang@caas.ac.cn)
英文摘要	Although it is well known that fluctuations in soil moisture affect the decomposition of organic matter, few studies have provided direct evidence of the underlying biophysical mechanisms. Cycles of wetting and drying (W/D) may not only alter soil pore structure, but also stimulate a proliferation of fungi, since these organisms are typically less affected by drought stress than bacteria, and hence the development of fungal-induced soil water repellency. The biophysical interaction between these processes is likely to influence the decomposition of organic matter amendments to soil and carbon sequestration. By using soil cores amended with rice straw, the objectives of this study were to determine the effects of drying intensity and frequency of W/D cycles on decomposition rate after rewetting, soil pore-size distribution, soil microbial biomass (SMB) and soil water repellency, and to assess their biophysical interaction. One W/D cycle consisted of wetting a soil core from the bottom for 1.5-days at -0.03 kPa followed by 1.5, 3.5 or 6.5 days of drying in open air at 25 +/- 2.5 degrees C. This resulted in different intensities of drying and frequencies of W/D cycles over a 120-d incubation period. The decomposition rate decreased with repeated W/D cycles and increasing drying intensity, particularly between the 3rd and 9th W/D cycles. The SMB-C concentration and soil water repellency peaked at the 3rd W/D cycle. The peak size of the SMB-C concentration was larger in the drier soils and soil water repellency was significantly related to SMB-C concentration (R = 0.57, P = 0.025). The soil with the strongest drying treatment had a greater concentration of particulate organic carbon (POC) and the lowest C:N ratio in POC. Although the decomposition rate was significantly correlated to the concentration of soil organic carbon (SOC) (P < 0.01), POC (P < 0.01) and SMB-C (P < 0.05), stepwise regression analysis further identified that it was largely correlated to soil pore characteristics. The decrease in the decomposition rate in the drier soil was largely explained by the increase in macropores >300 mu m in diameter (R = 0.98). The results suggest that an increased drying intensity or a longer duration of drying after rainfall or irrigation may favour SOC sequestration through inhibiting decomposition of amended residue. This may be due to the formation of macropores and their subsequent stabilization via fungal growth and fungal-induced soil water repellency. (C) 2010 Elsevier Ltd. All rights reserved.
收录类别	SCI
WOS关键词	DISSOLVED ORGANIC-MATTER ; MICROBIAL BIOMASS ; AGGREGATE STABILITY ; PHYSICAL-PROPERTIES ; NITROGEN MINERALIZATION ; WATER REPELLENCE ; N-MINERALIZATION ; CARBON ; DYNAMICS ; STABILIZATION
WOS研究方向	Agriculture
WOS类目	Soil Science
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000287435300014
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2558936
专题	南京土壤研究所
通讯作者	Zhang, Bin
作者单位	1.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China 2.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Key Lab Plant Nutr & Nutrient Cycling, Minist Agr China, Beijing 100081, Peoples R China 3.Nanjing Agr Univ, Coll Nat Resource & Environm, Inst Soil Ecol, Nanjing 210079, Peoples R China
推荐引用方式 GB/T 7714	Yao, Shui-Hong,Zhang, Bin,Hu, Feng. Soil biophysical controls over rice straw decomposition and sequestration in soil: The effects of drying intensity and frequency of drying and wetting cycles[J]. SOIL BIOLOGY & BIOCHEMISTRY,2011,43(3):590-599.
APA	Yao, Shui-Hong,Zhang, Bin,&Hu, Feng.(2011).Soil biophysical controls over rice straw decomposition and sequestration in soil: The effects of drying intensity and frequency of drying and wetting cycles.SOIL BIOLOGY & BIOCHEMISTRY,43(3),590-599.
MLA	Yao, Shui-Hong,et al."Soil biophysical controls over rice straw decomposition and sequestration in soil: The effects of drying intensity and frequency of drying and wetting cycles".SOIL BIOLOGY & BIOCHEMISTRY 43.3(2011):590-599.

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