摘要
在利用稻鸭互利共生的关系的基础上,将免耕技术引入稻田生态系统,形成稻田免耕养鸭技术新体系.从土壤生物学特性方面对免耕稻鸭复合系统生态学特性进行了研究,旨在为评价该系统的生态学功能提供科学依据.结果表明:1)各处理土壤中三大类微生物数量在剖面中有明显的上高下低的分布趋势,特别是0～5cm土层,NCD(免耕养鸭处理)量高于同层次的NCND(免耕不养鸭处理)和CCND(翻耕不养鸭处理).NCD的剖面分布也是呈现上高下低的格局,但5～15cm土层中各微生物数量和总数均大于NCND和CCND处理中同层次的微生物数.上下两层土壤中,NCD与CCND和NCND的差异均达到极显著水平.2)土壤微生物量生物量碳依土壤层次的深浅呈现从上到下渐减的趋势,与微生物的数量分布趋势相一致,各处理中微生物生物量碳从大到小的顺序依次为:NCD,NCND,CCND.由此可见,免耕养鸭有利于和土壤微生物数量和微生物生物量碳的增加,这与该处理较高的土壤肥力和水稻生产过程中实现农药、除草剂的'零输入'有关.
Based on the mutualistic symbiosis relationship of rice and duck,jointed with no-tillage technique,the new no-tillage system of raising duck in paddyfield was formed.In order to provide the scientific and theoretic foundation for ecological assessment and popularization of the system,soil microbe was studied.The results showed that:firstly,the amounts of three kinds of microbe in section has an obvious floristic distribution trend,the upper the more.Especially in 0~5 cm soil,each microbe amounts of the NCD(no-tillage cast-transplanted with duck treatment)was more than the same layer of the NCND(no-tillage cast-transplanted without duck treatment)and the CCND(conventional-tillage cast-tran- splanted without duck treatment).Although the section distribution was that the upper was higher and the nether was lower,among 5~15 cm dust,the amount of each microbe and total amount of all kinds of microbes were both greater than those of the same layer of the NCND and the CCND.Among two different soil horicons,the difference between NCD and NCND with CCND was significant.Secondly,microbe biomass had the same trend too.The sequence was NCD, NCND,CCND.Authors believed that the increase of soil microbe amounts and microbe biomass in NCD was the result of high fertilizer and “zero input” pesticides in this treatment.
出处
《湖南农业大学学报（自然科学版）》
CAS
CSCD
北大核心
2005年第1期35-38,共4页
Journal of Hunan Agricultural University(Natural Sciences)
基金
湖南省科技厅资助项目(00NYK1001)
