摘要
研究了不同施氮量及灌溉方式下玉米地土壤的微生物量碳及硝化潜势。结果表明：未施氮肥条件下,喷灌比漫灌土壤平均硝化潜势低0.57-4.77 mg/（kg.d）;不同时期喷灌施肥土壤平均硝化潜势变化量为2.18-4.77 mg/（kg.d）,幅度较小;而漫灌施肥土壤硝化潜势的变化量为-0.57-28.4 mg/（kg.d）,幅度较大。土壤微生物量碳的变化受施肥与灌溉方式的影响,9月份土壤微生物量碳均低于7月份,未施氮肥条件下,喷灌下降9.05 mg/kg,变化幅度较小;而漫灌下降176.52 mg/kg,变化幅度较大。施氮肥均降低土壤微生物碳量;不同时期漫灌施肥与漫灌未施肥、喷灌施肥与喷灌未施肥相比分别降低土壤平均微生物量碳108.78-0.57 mg/kg,58.82-86.71 mg/kg。
The soil microbial biomass carbon and potential nitrification rate were analysed in different treat-ments designed in typical irrigation agricultural North China. The result showed that. the average of poten- tial nitrification rate of sprinkling irrigation was less than that of flood irrigation by 0. 57-4. 77 mg/（kg·d） in un--fertilizer conditions, and the average change of optimized fertilization at different stages was 2.18- 4, 77 mg/（kg·d） which scope was small, on the other way, traditional was --0.57-28.4 mg/（kg·d） which scope was large. The change of microbial biomass carbon was effected by fertilization and irrigation, the amount of microbial biomass carbon in September was less than that in July, under the conditions of no fertilizer, the change of optimized fertilization was 9.05 mg/kg which was small sprinkler smaller decline in the rate change 9.05 mg/kg; on the other way, traditional was 176.52 mg/kg which was large. The microbial biomass carbon was decreased by N--Fertilizer. The microbial carbon respectively decreased 108.78-0.57 mg/kg and 58.82-86.71 mg/kg by traditional and non-traditional fertilization, optimization and optimization of fertilization in different periods. Optimized fertilization of soil nitrification potential changes in the average amount of 2.18-4.77 mg/kg less; and traditional soil fertilization changes in nitrification potential of --0.57-28.4 mg/kg larger . Changes in soil microbial biomass carbon by means of the impact of soil micro- bial biomass carbon in September were lower than in July, under the conditions of no fertilizer, sprinkler smaller decline in the rate change 9.05 mg/kg; 176.52 mg/kg the decline in flood irrigation larger changes; different periods of time with the did not reduce soil fertilization, respectively, compared to the average microbial biomass C.
出处
《水土保持学报》
CSCD
北大核心
2009年第4期218-220,226,共4页
Journal of Soil and Water Conservation
基金
中国科学院知识创新工程重要方向项目(kzcx2-yw-204-2)
国家自然科学基金(40711130636)
关键词
施氮肥
灌溉方式
硝化潜势
土壤微生物量碳
fertilizer
irrigation method
potential nitrification rate
soil microbial biomass carbon
