渭北果园生草生物量与土壤养分因子的关系

果园生草技术作为一种先进的果园管理模式,能够改善土壤的理化性状。采用Person相关性和通径分析方法,对苹果园清耕、苹果/白三叶(Trifoliurn repens L.)、苹果/红三叶(Trifolium pretense)、苹果/小冠花(Coronilla varia L.)、苹果/鸡脚草(Dactylis glomerata L.)、苹果/百脉根(Lotuscorniculatus)间作6种管理模式下生草生物量和土壤养分因子进行了研究,探讨了生草生物量与土壤养分因子的关系,以期为果园生草的合理选择与有效管理提供参考。结果表明:5种生草的总生物量都介于150~300 g·m-2,小冠花的总生物量最大,而白三叶最小,具体顺序为:小冠花百脉根鸡脚草红三叶白三叶。通径分析结果表明,土壤肥力因子对生草生物量的直接作用系数大小顺序为容重全氮速效钾有机碳硝态氮铵态氮速效磷,土壤容重和全氮的直接和间接通径系数较大(分别为0.847和0.917),是影响生草生物量最主要的因素,速效钾和有机碳是影响生草生物量的次要因子,而硝态氮、铵态氮和速效磷对生草生物量的作用很微弱。

Relationship between orchard herbage biomass and soil nutrient factors in Weibei

Interplanting herbage in orchard ,an advanced orchard management mode ,plays a significant role in im-proving orchard soil conditions .By using the methods of Person correlation and path analysis ,this paper studied herbage biomass and soil nutrient factors under six species of management mode in apple orchards ,including clear tillage mode , Trifoliurn repens L .mode ,Trifolium pretense mode ,Coronilla varia L .mode ,Dactylis glomerata L .mode and Lotus-corniculatus mode .The relationship between herbage biomass and soil nutrient factors was thereby explored ,providing a reference for the rational choice of orchard herbage planting and its effective management .The results showed that total biomass by five herbages was each between 150 ~ 300 g·m - 2 .Coronilla varia L .had the maximal total biomass .Howev-er ,Trifoliurn repens L .resulted in the minimum .The order for biomass from high to low by different modes was Coronil-la varia L .> Lotuscorniculatus > Dactylis glomerata L .> Trifolium pretense > Trifoliurn repens L .From the path analy-sis ,the sequence of soil properties based on their direct effect on herbage biomass was :Bulk density > Total N > Avail-able K > Organic carbon > Nitrate nitrogen > Ammonium nitrogen > Available P ,meaning that direct (0 .847 and 0 .917 , respectively) and indirect path coefficient of soil bulk density and total nitrogen were both the highest .These were the most important factors that affect herbage biomass .Available potassium and organic carbon were the secondly important factors that influence the herbage biomass ,whereas nitrate nitrogen ,ammonium nitrogen and available phosphorus had weak effects on herbage biomass .