论文部分内容阅读
为探讨免耕玉米秸秆不同覆盖频率下大型土壤动物群落组成、结构和季节变化,于2015年4、7和10月,在中国科学院吉林省梨树县保护性耕作试验基地,对免耕玉米秸秆不同覆盖频率各样地进行大型土壤动物群落调查。结果获得大型土壤动物26类,隶属2门5纲13目,线蚓为优势类群,不同类群在各处理样地所占数量比例存在差异。免耕秸秆不同覆盖频率样地大型土壤动物个体密度、类群丰富度和多样性指数均高于常规耕作样地。各处理样地大型土壤动物群落个体密度的最高值均出现在10月,类群数量和多样性则以7月最高。不同土壤动物类群对免耕秸秆覆盖频率增加的响应存在差异。相对常规耕作,免耕秸秆覆盖频率的增加可显著提高腐食性类群密度。
In order to explore the composition, structure and seasonal variation of soil macro-animal community under different coverage frequency of no-tillage corn stalks, in April, July and October 2015, in the protection tillage test base of Lishu County, Jilin Province, Chinese Academy of Sciences, Large-scale soil fauna surveys were conducted with different coverage frequencies. Results 26 species of soil macrofauna were found, belonging to 2 orders, 5 classes and 13 orders, and the earthworm was the dominant group. The proportions of different groups in each sample were different. The individual density, richness and diversity index of macro soil fauna in no-till straw with different coverage frequency were higher than those in conventional tillage. The highest values of individual density of soil macrofaunal communities in all plots occurred in October, and the number and diversity of taxa were the highest in July. Different soil fauna showed different responses to the increasing frequency of no-till straw mulching. Compared with conventional tillage, the increase of no-tillage straw mulching frequency could significantly increase the density of the rotting population.