膜炭共作对控灌稻田土壤水热和无机氮分布及产量的影响OA

In order to explore the impact mechanisms of mulching and biochar on soil hydrothermal and inorganic distribution,as well as yield in controlled irrigation paddy fields,four treatments were set up:no mulching and no biochar application(CK),film mulching(CF),application of 2.5 t/hm2 biochar(CB),and combined film mulching with application of 2.5 t/hm2 biochar(CBF).The spatio-temporal variation trends of soil hydrothermal,inorganic nitrogen,crop yield,and their components in different soil layers of paddy fields under mulching and biochar conditions were analyzed.The correla-tion characteristics of soil hydrothermal,inorganic nitrogen,and yield under the combined application of mulching and biochar co-cultivation conditions were quantified.The results demonstrate that,com-pared with the control(CK),different mulching and biochar treatments significantly enhance soil moisture content,ammonium nitrogen,and nitrate nitrogen levels.The CBF treatment shows the most pronounced improvement,with increases of 7.2%-22.3%in soil moisture,8.9%-27.8%in ammonium nitrogen,and 11.0%-22.1%in nitrate nitrogen.The combined treatment of mulching and biochar application(CF and CBF)can increase soil temperature,while the single application of 2.5 t/hm2 biochar has no significant effect on increasing soil temperature.Rice yield significantly correlates positively with soil water content,soil ammonium nitrogen,and nitrate nitrogen content(P＜0.05).The CBF treatment achieves maximum economic benefits with 26.8%yield increase and 15.1%net in-come enhancement.Comprehensive evaluation reveals that the combined film mulching and biochar ap-plication represents the optimal management practice for irrigation paddy fields in this study.This re-search provides theoretical references for establishing appropriate film mulching and biochar application strategies in Heilongjiang paddy fields.