接种蚯蚓对盐碱土养分、土壤生物及植被的影响

在施用牛粪的盐碱土中分别接种15和30条蚯蚓,以不接种蚯蚓为对照,进行了6个月的温室培养,旨在研究接种蚯蚓对盐碱土养分、土壤生物及植被的影响.结果表明:接种蚯蚓增加了土壤中速效磷、速效钾的含量,土壤有机质的含量则显著降低.接种蚯蚓并未显著增加植被的生物量,但增加了土壤微生物量碳、线虫丰富度及螨虫丰富度.接种蚯蚓改变了线虫各营养类群的相对丰富度和螨虫各亚目的相对丰富度,但未显著影响土壤中细菌、线虫及螨虫的多样性指数和均一度指数.在盐碱地中接种蚯蚓能够改善土壤的理化性质及生物特性,是巩固盐碱地改良效果、促进盐碱地持续利用的有效方法之一.

Effects of earthworm inoculation on saline-alkali soil nutrient, soil organisms and plant cultivation

Over a period of six months,at the China Agricultural University greenhouse,15 and 30 individual earthworms were introduced into saline-alkali soil,to study the effect of earthworm inoculation on saline-alkali soil nutrient,soil organisms and plant cultivation.The results showed that earthworm inoculation increased the contents of soil available phosphorus and potassium,while soil organic matter content significantly decreased.Although plant biomass was not increased after earthworm inoculation,microbial biomass carbon,nematodes and mite abundance were increased.Earthworm inoculation changed the relative abundance of nematode trophic groups and mite suborder,but did not significantly affect soil bacteria,nematodes and mites Shannon Wiener diversity index and Evenness index.Earthworm inoculation improved the biological,chemical and physical processes of the soil ecosystem,which may play important roles on saline-alkali soil improvement.