华北高产农田生态系统中蚯蚓种群次生演替规律

通过对山东省桓台县不同土壤肥力的农田生态系统中蚯蚓种群的调查发现 ,该地区农田生态系统中有 7种蚯蚓 ,高肥力土壤中蚯蚓相对较丰富 ,种群密度可达 83.83条 / m2 ,梯形流蚓为优势种 ;低肥力土壤中蚯蚓种群密度 4 0 .18条 / m2 ,优势种是天锡杜拉蚓。梯形流蚓和湖北远盲蚓在高肥力土壤中的种群密度要明显高于低肥力土壤 ;而其他几种蚯蚓种群数量变化不大 ,随着土壤肥力的演变 ,低肥力土壤中天锡杜拉蚓的优势地位随着土壤肥力的提高逐渐被梯形流蚓所代替。合理的投入特别是农田有机物投入可以加速农田生态系统中生态演替 ;试验中不同处理间蚯蚓的种群生物量有以下趋势 :化肥投入 <化肥与麦秸还田 <化肥与玉米麦秸全还田 <化肥与玉米麦秸全还田以及有机肥的施用。无论在高肥力还是低肥力的土壤上都表现出相同的规律 ,但蚯蚓种群组成并没有明显差异

Secondary succession of earthworm population in high production agro-ecosystem in North China

The study was conducted in Huantai County Shandong Province in North China to study the secondary succession of earthworm population under low and high soil fertility in agro-ecosystem. The result shows that seven species were found both in two agro-ecosystems, but the earthworm population density and composition are different, the average earthworm population in the high fertility soil is relatively abundance, the population density is 83.83 in./m~2. Among the seven earthworm species, Aporrectae trapezoids is the dominant species. While in the low fertility soil, the population density is 40.18 ind./m~2 and Drawida gisti is the dominant species. Comparing the density of each earthworm species in the two kinds of soil fertility agro-ecosystems, the density of Aporrectae trapezoids and Amynthas hupeiensis is significantly higher in the high fertility soil than that in the low fertility soil, while the difference of other five species is not obvious. This result shows that with the succession of the soil fertility, the earthworm also has a process of succession; the abundance species in the low fertility agro-ecosystem Drawida gisti is gradually substituted by Aporrectae trapezoids in the high fertility agro-ecosystem. One-year experiment was also conducted to study the impact of the organic input on earthworm population and succession. The result shows that with the increase of the organic input, the earthworm population density is increasing, the earthworm density of the treatments has the following ascending trend: Chemical fertilizer