不同腐熟剂对玉米秸秆腐解及养分释放动态的影响

利用尼龙网袋法模拟玉米秸秆还田,研究不同腐熟剂对玉米秸秆腐解速率及有机碳、氮、磷、钾养分释放特征。结果表明:(1)玉米秸秆应用不同腐熟剂的腐解速率均表现为:快速腐解期(前10天)中速腐解期(10~50天)缓慢腐解期(50~100天)。经过100天的分解,玉米秸秆生物量有72.46%~76.09%被分解,应用腐熟剂的累积腐解率均高于未施用腐熟剂处理。(2)玉米秸秆养分释放表现为:KPCN。100天结束时玉米秸秆有机碳、氮、磷、钾养分释放率平均分别为:58.66%、57.3%、88.68%、94.88%。秸秆腐熟剂有益于玉米秸秆中难分解物的分解,可加速秸秆中有机碳、氮、磷的释放。综合比较,有机废物发酵菌曲的效果最佳,更适宜推广。

Decomposition Rate and Nutrient Release of Corn Stalk Treated with Different Decomposition Maturing Agents

Using nylon net to simulate stalk return to soil, the decomposition rate and nutrient release of organic C, N, P and K of corn stalk treated with different decomposition maturing agents were studied. The results showed that: (1) the decomposition rate of corn stalk was: fast decomposition period (first 10 days)>medium decomposition period (10-50 days)>slow decomposition period (50-100 days); after 100 days, 72.46%-76.09% of the corn stalk biomass was decomposed; the accumulated decomposition rate under decomposition maturing agent was higher than that of CK; (2) the sequence of nutrient release rate of corn stalk was: K>P>C>N, after 100 days, the average nutrient release rate of organic C, N, P and K of corn stalk was 58.66%, 57.3%, 88.68% and 94.88%, respectively; the decomposition maturing agent was beneficial to difficult destructive materials in corn stalk and could accelerate nutrient release of organic C, N and P. It was demonstrated that zymogeneous bacteria of organic waste had the best effect and could be promoted in production.