摘要
果园生草提高土壤肥力,减少水土流失,具有良好的生态环境效益.但生草对土壤氮素的供应影响是果农关注的问题之一.本研究通过室内培养试验,研究了不同时期采集的果园生草作物（鼠茅草）的降解特性及其对氮素固持的影响.结果表明,鼠茅草枯萎后,地上部易降解有机碳占51%,鼠茅草难降解部分残留在土壤当中每年增加1t/hm^2 的土壤碳固持;施氮肥加快鼠茅草的降解,同时增加其稳定有机碳的相对含量,对土壤固碳量影响不大;鼠茅草枯萎还田后对土壤氮素的固持量为39～65 mg/kg,因此在中低肥力土壤施肥时应适当地补充60～100kg/hm^2氮素,避免微生物和果树争肥,同时提高土壤肥力.
Cover cropping in orchard is an efficient soil management technique for improving soil fertility and re-ducing soil erosion.However,the effect of cover crops on nutrient supply is not well understood and a concern for growers.An experiment was conducted to investigate the decomposition characteristics of a cover crop (Vulpia myuros )and its effect on N supply in orchard soil.The decomposable organic C in straw ofV .myu-ros accounted for 51% of organic C;the remainder increased soil C sequestration by 1 t/ha per year.Applica-tion of exogenous N fertilizer had no effect on annual net C sequestration,although it increased the decomposi-tion rate ofV .myuros straw.During decomposition,immobilized N ranged from 39-65 mg/kg.Consequent-ly an additional 60-100 kg N/ha should be applied duringV .myuros decomposition in low fertility soils in the first few years to avoid competition between soil microbes and crop trees,and to improve soil fertility.
出处
《草业学报》
CSCD
北大核心
2016年第3期245-250,共6页
Acta Prataculturae Sinica
基金
山东省自然科学基金(ZR2013DQ014)
公益性行业(农业)科研专项项目(201103005)资助
关键词
苹果园
固持
施氮
二氧化碳释放
apple orchard
immobilization
nitrogen application
carbon dioxide emission
作者简介
梁斌（1983-）,男,山东昌乐人,博士.E-mail：liangbin306＠163.com
