水土保持学报2017，Vol.31Issue(3)：283-290,8.DOI:10.13870/j.cnki.stbcxb.2017.03.047
肥料减施条件下水稻土壤有机碳组分对紫云英-稻草协同利用的响应
Responses of Contents of Soil Organic Carbon Fractions to Chinese Milk Vetch-rice Straw Synergistic Dispatching Under the Condition of Reducing Fertilizer Application
摘要
Abstract
Effects of different utilization models of Chinese milk vetch and rice straw on characteristics of paddy soil organic carbon fractions under chemical fertilizer reduction were studied in order to provide a reference for rational utilization of organic materials for soil fertility control.A field experiment for five consecutive years (during 2011-2015) was designed to study the responses of the contents of purple soil total organic carbon (TOC),microbial biomass carbon (MBC),dissolved organic carbon (DOC),easily-oxidized organic carbon (EOC) and light fraction organic carbon (LFOC) to different utilization models of Chinese milk vetch and rice straw in double-rice cropping field of the Dongting Lake region in Nan Country of Hunan Province.The results indicated that F100 significantly increased the contents of soil TOC,MBC,DOC,EOC and LFOC,which was 12.2％,19.5％,18.6％,11.3％ and 100.9％ greater than that of the unfertilized control,respectively.Compared with F100,different utilization models of Chinese milk vetch and rice straw could be more suitable for the accumulation of TOC,MBC,DOC,EOC and LFOC under chemical fertilizer reduction.Wherein the optimal was F80+HR+A,which was 18.3％,47.2％,24.1％,20.0％ and 204.0％ greater than that of the unfertilized control,respectively.Applying Chinese milk vetch alone under chemical fertilizer reduction favored the buildup of MBC,DOC and EOC,which was 9.8％,4.0％ and 0.6％ greater than that of rice straw alone,respectively,but the LFOC was the opposite,being 34.8％ lower.Sensitive index showed that the LFOC and MBC had high activity,LFOC was more labile than MBC,and they could be used to evaluate soil quality.The sensitive indices of all organic carbon fractions in F80+ HR+A were significantly higher than those of F100.Correlation analysis showed that there was a significant relationship among rice yield,TOC and its labile organic carbon fractions (p ＜ 0.01).In conclusion,there were significant differences in TOC,labile organic carbon fractions among treatments amended with Chinese milk vetch and rice straw under chemical fertilizer reduction in purple soil.Returning rice straw could be prone to increase TOC and LFOC pool,and application of Chinese milk vetch was favorable to promote MBC,DOC and EOC.The pattern of Chinese milk vetch-rice straw synergistic dispatching,especially returning high pile of straw and winter planting Chinese milk vetch,could be prone to increase TOC and labile organic carbon fractions.关键词
减量施肥/紫云英/稻草/协同利用/土壤有机碳组分Key words
fertilizer reduction/Chinese milk vetch/rice straw, synergistic dispatching/organic carbon fractions分类
农业科技引用本文复制引用
周兴,廖育林,鲁艳红,谢坚,杨曾平,聂军,曹卫东..肥料减施条件下水稻土壤有机碳组分对紫云英-稻草协同利用的响应[J].水土保持学报,2017,31(3):283-290,8.基金项目
农业公益性行业科研专项(201103005-08) （201103005-08）
国家“十二五”科技支撑计划项目(2012BAD05B05-3) （2012BAD05B05-3）
国际植物营养研究所科研项目(Hunan-16) （Hunan-16）
