摘要
在黄淮海平原小麦-玉米一年两熟地区,试验设置了5个处理,分别为玉米小麦每年均翻耕(CTWT)、玉米免耕+小麦每年翻耕(CNTWT)、玉米免耕+小麦每2年翻耕(CNTW2T)、玉米免耕+小麦每4年翻耕(CNTW4T)、玉米小麦每年均免耕(CNTWNT),所有处理的农作物地上秸秆全部移出。调查结果显示,中小型土壤动物在数量上占总数的比例为83%～91%,土壤动物主要分布在表层,占有其总量的71.9%～73.2%。土壤动物存在显著的季节性动态,其丰富度在玉米季高于小麦季。土壤动物Shannon多样性指数在整体上表现为翻耕高于免耕处理,玉米季翻耕处理下有更高的均匀度指数,但小麦季均匀度指数差异不显著。多元典范冗余分析表明,耕作方式主要是对土壤动物的时间动态和垂直分布产生影响,从而间接地影响了土壤动物的数量和组成。
An experiment was conducted to study the effects of tillage practices on soil fauna in areas of two crops a year of wheat-corn rotation in Huang-Huai-Hai Plain. Five treatments included： corn tillage annually ＋ wheat tillage annually （CTWT）, corn no-tillage annually ＋ wheat tillage annually （CNTWT）, corn no-tillage annually ＋ wheat tillage every other year （CNTW2T）, com no-tillage annually ＋ wheat tillage every four years （CNTW4T）, corn no-tillage annually ＋ wheat no-tillage annually （CNTWNT）. The results showed that： mesofanna and microfauna together accounted of 83% - 91% of total soil fauna, and macrofanna accounted for 9% - 17%. More soil fauna distributed at 0 - 10 cm soil layer which accounted of 71.9% - 73.2% of total soil fauna. Significant seasonal dynamics was observed for soil fauna, the richness of soil fauna was higher in corn season than in wheat season. The evenness of soil fauna was higher in tillage plots than in no-tillage plots in corn season but Shannon diversity index was contrary. By redundancy analysis, it suggests that tillage practices primarily influence seasonal dynamics and vertical distribution pattern of soil fauna, thus cause the changes in richness and diversity of soil fauna.
出处
《土壤》
CAS
CSCD
北大核心
2010年第2期236-242,共7页
Soils
基金
中国科学院知识创新工程重大项目(KSCX1-YW-09-05)
国家重点基础研究发展计划项目(2005CB121103)资助
关键词
小麦-玉米轮作
免耕
土壤动物
冗余分析
Wheat-corn rotation, No-tillage, Soil fauna, Redundancy analysis
