不同节水稻作模式对土壤理化特性和土壤酶活性影响研究

针对南方丘陵区季节性干旱现状与目前稻田单一化的连作耕作制度对农田环境造成的不利影响因素,通过4a田间定位试验研究了节水稻作模式下土壤理化性状和土壤酶活性变化规律影响.结果表明,与该区常规稻作模式相比.在试验设计范围内,节水稻作模式下稻田的土壤理化性状明显改善,随着耕种年限增加,土壤容重下降,而孔隙度增加.土壤通透性增强,有效阻止土壤次生潜育化和土壤酸化.提高了土壤pH值;就土壤酶活性而言,节水稻作模式处理酶活性常规稻作模式相比.除转化酶外,其它酶活性均有不同程度的增加,尤其对磷酸酶与脲酶影响最大.

Effect of Water-saving Rice Cultivation Patterns on Soil Physical and Chemical Characteristics and Soil Microbial Activity

Environment of cultivated land has been influenced unfavorably by single continuous cropping in paddy field, and seasonal drought often seriously affects rice production due to water stress. The soil physical and chemical characteristics and soil enzyme activity of water-saving rice cultivation patterns were studied in the field experiment in this paper. The results showed that, water-saving rice cultivation patterns had improved soil physical and chemical characteristics apparently. Water-saving rice cultivation patterns could not only provide water indispensable to life, but also ameliorate the condition of soil water content and ventilation. The activities of catalase, phosphatase, urease, polyphenoloxidase were higher than those of the conventional double cropping rice pattern and especially for phosphatase and urease.