不同土壤培肥措施对华北高产农田生态系统蚯蚓种群的影响

通过在华北高产农田生态系统进行的土壤培肥试验 ,研究了不同秸秆还田方式和施肥措施对土壤大型动物——蚯蚓的影响。研究结果表明 :该区域高肥力土壤共有 7种蚯蚓 ,其中以正蚓科梯形流蚓为主 ,并同时分布巨蚓科的远盲蚓属、腔蚓属和链胃蚓科的杜拉蚓属的一些广布种。全年平均种群密度为 83.83条 /m2 ,最高种群数量出现在 1998年 8月份 ,其季节变化趋势为夏季 >春季 >秋冬季。在投入同量化肥条件下 ,有机物投入越多 ,蚯蚓越丰富 ,其生物量有以下趋势 :化肥投入 <化肥与麦秸还田 <化肥与玉米秸麦秸全还田 <化肥与玉米秸麦秸还田加施有机肥处理。在有有机物投入的条件下 ,化肥对土壤生物的负面效应不明显 ,不会对土壤中的蚯蚓有较大影响 ;而单施化肥 ,对蚯蚓负面影响较为显著。有机肥的施入可以增加蚯蚓的种群数量 ,随着时间的增加这种趋势越明显

Impact of soil fertility maintaining practice on earthworm population in high production agro-ecosystem in North China

The study was conducted in high production agro-ecosystem in Huantai County Shandong Province of China North plain to study the impact of organic input and chemical fertilizer application on earthworm population. The result shows that there were seven species in Huantai high production agro-ecosystem, Among the seven earthworm species, Aporrectae trapezoids is the dominant species. The average earthworm population is 83.83 indiv./m~2. The highest population density was found in August 1998 among the five surveys of the study, the seasonal variation of the earthworm population is: summer>spring>autumn and winter. The impact of chemical fertilizer on the earthworm population depends on the organic input and the earthworm population density increases accordingly. The earthworm density of the treatments has the following ascending trend: Chemical fertilizer