蚯蚓处理猪粪与秸秆的最适碳氮比及混合物腐熟度评价  

Optimal C/N ratio of pig manure-rice straw mixture for its composting with earthworm and maturity assessment of the mixture compost

作　　者：高娟[1] 杨京平[1] 杨虎[1] 

机构地区：[1]浙江大学紫金港校区环境与资源学院环境保护研究所,杭州310058

出　　处：《应用生态学报》2012年第3期765-771,共7页Chinese Journal of Applied Ecology

基　　金：国家水体污染控制与治理科技重大项目(2008ZX07101-006-07)资助

摘　　要：以猪粪和水稻秸秆混合作饵料,通过90 d的室内培养试验,用平均体质量、日均质量增加倍数、日均产茧量和累计繁殖量等指标衡量4个处理(C/N 20、C/N 25、C/N 30和C/N35)中蚯蚓的生长繁殖状况,并通过35 d的混合物(C/N 25、C/N 30和C/N 35)腐熟试验,采用pH、C/N和水溶性有机碳(DOC)3个指标综合评定混合物腐熟度.结果表明:处理C/N 30的蚯蚓生长繁殖状况显著优于其他处理.35 d的混合物腐熟试验以21 d为拐点,pH和DOC均呈现先下降后上升的趋势,C/N则呈现持续下降趋势;但综合3个指标衡量,混合物至试验结束尚未完全腐熟.处理C/N 25在7～35 d时C/N<20,表明C/N<20不适宜作为衡量混合物腐熟与否的单一指标,应结合其他指标综合判定混合物的腐熟情况.Taking the pig manure-rice straw mixtures with different C/N ratios（20,25,30,and 35） as the feed of earthworm（Eisenia fetida）,a 90-day incubation test was conducted to study the growth and reproduction of E.fetida,with the average body mass,daily body mass increase,daily cocoon production,and accumulated cocoon production as the indicators.In the meantime,a 35-day composting experiment was arranged to assess the maturity of the same mixtures with C/N 25,30,and 35,using pH,dissolved organic carbon（DOC）,and C/N as the indicators.In the 90-day incubation test,the mixture with a C/N ratio 30 was most suitable for the growth and reproduction of E.fetida.In the 35-day composting experiment,the mixtures＇ pH and DOC decreased in the first 21 days and increased thereafter,while the C/N decreased persistently during the 35 days.With the comprehensive consideration of the three indicators,the mixtures were still not fully matured by the end of the experiment.For the mixture with a C/N ratio 25,its C/N ratio was 20 in the 7-35 days.Traditionally,the mixture was considered as composted matured when the C/N ratio was below 20,but based on the assessment of pH and DOC,the mixture was still under immature condition.Therefore,C/N20 alone was not a proper indicator for the maturity assessment on the composting of pig manure-rice straw mixture.

关 键 词：猪粪 水稻秸秆 蚯蚓 碳氮比 生长繁殖 腐熟度 

分 类 号：X71[环境科学与工程—环境工程]