保护性耕作对黄土高原塬区作物轮作系统磷动态的影响  

Dynamic of phosphorus with wheat-soybean rotation systems under conservation tillage in the western Loess Plateau

作　　者：郑丽娜[1] 王先之[1] 沈禹颖[1] 

机构地区：[1]兰州大学草地农业科技学院农业部草地农业生态系统学重点开放实验室,甘肃兰州730020

出　　处：《草业学报》2011年第4期19-26,共8页Acta Prataculturae Sinica

基　　金：国家重点基础研究发展规划(2007CB106804和G2000018602);澳大利亚国际农业研究中心项目(LWR21999/094);教育部2003年重点科技项目(103164)资助

摘　　要：在黄土高原塬区,对保护性耕作下小麦-大豆轮作系统的土壤全磷（total phosphorus）、速效磷（availablephosphorus）和作物吸磷量进行了动态观测。保护性耕作处理为传统耕作＋秸秆覆盖（ts）,免耕（nt）,免耕＋秸秆覆盖（nts）,以传统耕作（t）为对照,结果表明,实施保护性耕作10年对轮作系统冬小麦产量没有显著影响,夏播大豆产量对秸秆覆盖有积极响应;免耕处理提高了土壤全磷和速效磷含量,使土壤磷在0~5 cm层次表聚化,土壤磷含量随着保护性耕作时间的延长呈增加趋势,nts和ts处理下大豆籽粒吸磷量比对照显著提高111%和82%,秸秆覆盖提高了作物对磷的吸收;小麦-大豆轮作有助于提高土壤速效磷含量。结果揭示了黄土高原雨养农业区保护性耕作对土壤-作物系统磷动态的影响,为该系统的磷管理提供了一定的理论指导。The research presented crop yield,phosphorus dynamic for a wheat-soybean rotation systems affected by tillage management： conventional tillage（t）,tillage＋stubble retention（ts）,no-till（nt）,no-till＋stubble retention（nts） in the Loess Plateau.Results showed that ten years tillage management implementation did not carry a yield penalty for winter wheat,soybean yield had a positive response to conservation tillage.Soil phosphorus content increased with the increasing of rotation sequences.Both total phosphorus and available phosphorus contents were increased at top 0-5 cm.Stubble retention increase crop phosphorus uptake,P contents in soybean grain under nts and ts treatnment were 111% and 82% higher than that under t treatment.The results provide a local agricultural implement provides certain theoretical guidance.

关 键 词：保护性耕作 全磷 速效磷 磷吸收量 轮作系统 

分 类 号：S345[农业科学—作物栽培与耕作技术]