江苏农业学报2025，Vol.41Issue(10)：1954-1961,8.DOI:10.3969/j.issn.1000-4440.2025.10.009
秸秆还田替代部分化肥对红壤稻田土壤活性有机碳、有机氮含量及相关酶活性的影响
Effects of straw incorporation as a partial substitute for chemical fertilizers on labile organic carbon,organic nitrogen content,and relevant enzyme activities in red paddy soils
摘要
Abstract
Long-term application of large amounts of chemical fertilizers in red paddy soils inhibits microbial activity,disrupts carbon and nitrogen cycling,and ulti-mately compromises soil health and paddy field productivi-ty.To optimize the sustainable fertilization strategies for red paddy soils,this study explored the effects of chemical fertilizer reduction combined with straw returning on soil labile organic carbon,organic nitrogen content,and rele-vant enzyme activities based on the long-term field experi-ment for 17 consecutive years.We set up three treatments:no fertilizer(CK),high-rate nitrogen,phosphorus and potassi-um fertilizer(NPK)and reduced chemical fertilizer combined with straw incorporation(OF).The results showed that com-pared with CK and NPK treatment,OF treatment significantly increased the content of microbial biomass carbon,soluble organic nitrogen and microbial biomass nitrogen in red paddy soils(P<0.05).The overall trend of soil β-glucosidase(BG)and N-acetyl-β-D-glucosaminidase(NAG)activities was OF treatment>NPK treatment>CK.Soil microbial biomass carbon,microbial biomass nitrogen,and soluble organic nitrogen(SON)content all exhibited significant or highly significant posi-tive correlations with BG and NAG activities.Based on the above findings,the 17-year continuous practice of reducing chemical fertilizer combined with straw incorporation comprehensively enhanced soil labile organic carbon and organic nitro-gen content,increased BG and NAG activities,and thereby improved soil fertility and quality in red paddy soils.Reduced chemical fertilizer application combined with straw incorporation is a superior management strategy for enhancing soil quality in red paddy soils,which also indirectly improves the agricultural ecological enviroment through optimized nitrogen,phos-phorus and potassium fertilizer formulation.关键词
化肥减施/秸秆还田/可溶性有机碳/可溶性有机氮/微生物生物量碳/微生物生物量氮/土壤酶活性Key words
fertilizer reduction/straw incorporation/soluble organic carbon/soluble organic nitrogen/microbial biomass carbon/microbial biomass nitrogen/soil enzyme activities分类
农业科技引用本文复制引用
刘蓉,陈春兰,傅心赣,秦红灵,方成..秸秆还田替代部分化肥对红壤稻田土壤活性有机碳、有机氮含量及相关酶活性的影响[J].江苏农业学报,2025,41(10):1954-1961,8.基金项目
科技基础资源调查专项(2021FY100504) （2021FY100504）
国家生态系统观测研究网络(CNERN)湖南桃源农田生态系统国家野外科学观测研究站运行服务项目 （CNERN）
中国生态系统研究网络(CERN)桃源农业生态试验站运行项目 （CERN）
