广西主要作物秸秆腐解特征研究-土壤学专业论文.docxVIP

II II 剂进一步增加秸秆腐解和养分释放。 关键词：水稻秸秆；蔗叶；木薯茎秆；养分释放；微生物；酶活性 PAGE PAGE IV Decomposing characteristics of main crop straws in Guangxi Luo Wenli (College of Agriculture, Guangxi University, Nanning 530004, China) Abstract In order to provide a scientific basis for the rational utilization of straw and nutrient resource management, this study has investigated the decomposition rate, nutrient release characteristic, microbial quantity and enzyme activity in the decomposing process for different straw treatments. There were two kinds of rice straw (low N and high N), sugarcane leaf and cassava stalk, treated with original, chopped, chopped with decomposer and chopped with farm manure using the nylon net~bag method under the outdoor condition. Dry matter mass, nutrient content, microbial quantity and enzyme activity were determinated at 0, 10, 28, 35, 51, 74 and 91 d after treatment for rice straw experiment, and at 0, 27, 60, 102, 141, 195, 233, 269 and 304 d after treatment for the experiments of sugarcane leaf and cassava stalk, respectively. The main results are outlined as follows: Decomposing and nutrient releasing strength of rice straw were the largest at the first 10 days, at 91d after the decomposition, the decomposing rate of rice straw was 60.2-73.8%, the order of nutrient release rate was KPN. The treatments of chopped straw, chopped straw with decomposer or farm manure could promote the quantity of bacteria, and improved the activities of phosphatase and catalase, thereby promoted the straw decomposing and nutrient release, the treatment of chopped rice straw with farm manure was the best. The difference of decomposing and nutrient releasing rate in low N and high N straws was not significant, but the decomposing strength and nutrient releasing strength in high N straw were higher than those of low N straw. The decomposing strength in sugarcane leaves was the largest at 27-60 d, and the releasing strength of K was the largest at 0-27 d. The decomposing rate and