首页|Effect of Different Irrigation Methods on Dissolved Organic Carbon and Microbial Biomass Carbon in the Greenhouse Soil

Effect of Different Irrigation Methods on Dissolved Organic Carbon and Microbial Biomass Carbon in the Greenhouse Soil

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The objective of this study was to investigate the contents and distribution of dissolved organic carbon (DOC) and microbial biomass carbon (MBC) at 0-100 cm soil depth under three irrigation treatments,viz.,subsurface,drip and furrow irrigation in the greenhouse soil.The soil samples were collected at different depths (0-100 cm),and the contents of soil total organic carbon (TOC),DOC and MBC were analysed.The experiment was conducted for 10 yr,during which period the application of fertilizers and crop management practices were kept identical.The results showed that the contents of TOC,DOC and MBC were significantly affected by different irrigation regimes,decreased with the increase of soil depth.TOC at 0-10 and 80-1 00 cm soil depths followed the order of furrow irrigation ＞ subsurface irrigation ＞ drip irrigation,whereas at the depth of 10-80 cm followed the order of subsurface irrigation ＞ furrow irrigation ＞ drip irrigation.DOC and MBC contents at 0-100 cm soil depths followed the order of furrow irrigation ＞ drip irrigation ＞ subsurface irrigation,and drip irrigation ＞ furrow irrigation ＞ subsurface irrigation,respectively.The ratios of DOC and MBC to TOC accounted for 4.98-12.87% and 1.48-2.82%,respectively,which were the highest in the drip irrigation treatment,followed were in the furrow irrigation treatment,and the lowest in subsurface irrigation treatment.There were significant positive correlations among the contents of DOC,MBC and TOC in all irrigation treatments.The furrow irrigation facilitated the accumulation of TOC and DOC,while drip irrigation increased the MBC.The content of TOC and the ratios of DOC to TOC were the lowest in subsurface irrigation treatment.

greenhouseirrigation methodstotal organic carbondissolved organic carbonmicrobial biomass carbon

HAN Lin、ZHANG Yu-long、JIN Shuo、WANG Jiao、WEI Yan-yan、CUI Ning、WEI Wei

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College of Land and Environmental Sciences,Shenyang Agricultural University/Liaoning Key Laboratory of Agricultural Resources and Environment,Shenyang 110161,P.R.China

Agricultural Scientific Research Program,Liaoning Province,ChinaProvincial Innovative Team Program,Liaoning Province,China

20082120032007T 156

2010

农业科学学报(英文)
中国农业科学院农业信息研究所

农业科学学报(英文)

CSCD
影响因子：0.576
ISSN：2095-3119
年,卷(期)：2010.9(8)
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