沼液和氮肥配施对菜田土壤微生物生物量和活性的影响

目的]探讨沼液和化肥配施改良土壤的机制。方法]在总施氮量相同的条件下,比较了沼液和氮肥以及沼液和氮肥配施处理对菜地土壤硝态氮、铵态氮、有效磷和速效钾等养分、微生物量和土壤酶活性的影响。结果]化肥、沼液、沼液和化肥配施可明显提高土壤中硝态氮、铵态氮、有效磷和速效钾养分含量,改善土壤养分状况。同时,这3种施肥方式也增加了微生物量C和N,并显著降低了微生物C/N。化肥增加了土壤多酚氧化酶和几丁质酶活性,但对纤维素酶活性无显著影响。沼液、沼液和化肥配施明显增加了多酚氧化酶、纤维素酶和几丁质酶的活性,尤其以沼液和化肥配施效果最明显。结论]沼液和化肥配施为微生物提供了适宜的碳氮源,不仅改善了养分状况,而且促进了微生物活性,其效果最佳。

Effects of Biogas Slurry Combinated with Nitrogen Fertilizer on Soil Microbial Biomass and Enzyme Activities

Objective] The aim of the study was to understand the mechanism of the effects of biogas slurry combinated with nitrogen fertilizer on soil quality.Method] An investigation was made on vegetable field to study the influences of chemical nitrogen fertilizer,biogas slurry and their combinations with nitrogen and slurry on soil chemical properties,microbial biomass and soil enzyme activities.Results]Compared to no fertilize treatment,the contents of NO3-,NH4+,available P and K in soil were clearly increased...