保护性耕作对黄土高原塬区作物轮作系统磷动态的影响

摘要/Abstract

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(available phosphorus)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。

Abstract: 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.

中图分类号:

S344.1

郑丽娜,王先之,沈禹颖. 保护性耕作对黄土高原塬区作物轮作系统磷动态的影响[J]. 草业学报, 2011, 20(4): 19-26.

ZHENG Li-na, WANG Xian-zhi, SHEN Yu-ying. Dynamic of phosphorus with wheat-soybean rotation systems under conservation tillage in the western Loess Plateau[J]. Acta Prataculturae Sinica, 2011, 20(4): 19-26.

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