摘要
以渭北黄土高原苹果园为对象,设置传统的果园清耕与间作白三叶(Trifolium repens L.)两处理,分别采集0～5、5～10、10～20cm及20～40 cm土层土样,探讨了间作白三叶对苹果/白三叶复合系统总土壤有机碳(TOC)、轻组有机碳(LOCF)、重组有机碳(HOCF)的影响。结果表明:与果园清耕相比,TOC含量及土壤有机碳密度(SOCD)显著增加,增幅随土壤深度的增加而迅速降低;0～5、5～10、10～20 cm土层LOCF含量分别比清耕处理增加了7.02、4.57倍和2.49倍,LOCF分配比例(LOCF/SOC)比清耕处理提高了7.01、4.57倍和2.51倍,说明间作白三叶较好地改善了果园SOC质量;与LOCF及SOC含量的增幅相比,HOCF含量增幅较低,说明HOCF受间作白三叶影响较小。LOCF对间作白三叶敏感,是指示果园生草土壤有机碳变化的良好指标。
Interplanting cover crops in orchards is one of soil managements for the sustainability of orchards.Herein,we examined dynamics of soil total organic carbon（TOC）and light organic carbon fraction（LOCF）in an apple-white clover system in Weibei Loess Plateau from 2005 to 2011.Soil samples were collected at depths of 0～5 cm,5～10 cm,10～20 cm and 20～40 cm in clear tillage and white cloverinterplanting orchards.Total organic carbon and soil organic carbon density（SOCD）in apple-white clover intercropping system were significantly increased in comparison with the clear tillage orchard.The increments,however,decreased rapidly with soil depth.Compared to the clear tillage apple orchard,the LOCF and the ratios of LOCF to TOC increased by 7.02,4.57 times,and 2.49 times and 7.01,4.57 times and2.51 times at 0～5 cm,5～10 cm,and 10～20 cm soil layer,respectively.This suggests that interplanting white clover in apple orchard could improve the quality of soil organic carbon.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2014年第4期810-818,共9页
Journal of Agro-Environment Science
基金
公益性行业(农业)科研专项(201103005-9)
国家科技支撑计划(2014BAD16B06
2014BAD16B02)
国家现代农业产业技术体系项目(CARS-28)
陕西省科技攻关项目(2010K01-04-2)
陕西省科技统筹创新工程计划(2011KTZB02-02-05)
西北农林科技大学推广专项资助(Z222021211)
陕西省农业专项(K332021313)
关键词
果园生草
土壤有机碳
土壤轻组有机碳
interplanting grasses in orchard
soil organic carbon
light organic carbon fraction
