长期保护性耕作对陇中旱农区小麦田土壤磷组分的影响  

Effects of long-term conservation tillage on soil phosphorus fraction in rainfed wheat field of Longzhong

作　　者：刘生忠 王林林 司佳昂 李玲玲 LIU Shengzhong;WANG Linlin;SI Jiaang;LI Lingling(State Key Laboratory of Ar idland Crop Science,Lanzhou 730070,China;College of Agriculture,Gansu Agricultural University,Lanzhou 730070,China)

机构地区：[1]干旱生境作物学国家重点实验室,甘肃兰州730070 [2]甘肃农业大学农学院,甘肃兰州730070

出　　处：《甘肃农业大学学报》2024年第4期82-90,共9页Journal of Gansu Agricultural University

基　　金：甘肃省自然科学基金项目(21JR7RA813);国家重点研发计划项目(2021YFD1900700)。

摘　　要：【目的】研究不同保护性耕作措施对土壤磷组分的影响,为旱农区磷素高效利用提供理论依据。【方法】于2022年研究四种耕作措施[免耕(NT);免耕秸秆覆盖(NTS);传统耕作秸秆覆盖(TS);传统耕作(T)]对小麦农田0~60 cm土层Resin-P、NaHCO_(3)-P、NaOH-P、HCl-P和Residual-P磷组分含量。【结果】随着土层加深,各处理磷组分含量均呈下降趋势,但残留磷含量变化不明显。0~20 cm土层NTS处理土壤总磷含量和有效磷含量较T分别显著增加了9.95%和22.14%,但在20~60 cm土层土壤总磷和有效磷含量变化不明显,相关分析表明土壤有效磷含量与土壤有机碳、土壤水分含量呈正相关,与土壤pH呈负相关。【结论】免耕+秸秆覆盖有利于土壤总磷和有效磷的积累与提高,秸秆覆盖还田可能通过影响土壤有机碳和土壤水分和pH,促进土壤磷的活化,提高作物对磷的利用效率。【Objective】To study the effects of different conservation tillage measures on soil phosphorus fractions and to provide a theoretical basis for efficient phosphorus use in dryland agriculture.【Method】Four tillage practices(no-tillage,NT;no-tillage straw mulch,NTS;conventional tillage straw mulch,TS;conventional tillage,T)were studied in 2022 on the phosphorus fractions of Resin-P,NaHCO_(3)-P,NaOH-P,HCl-P and Residual-P in the 0~60 cm soil layer of wheat fields.【Result】With the deepening of the soil layer,the phosphorus content of each treatment showed a decreasing trend,but the residual phosphorus content did not change significantly.In the 0~20 cm soil layer of the NTS treatment,the total phosphorus content and the effective phosphorus content increased significantly by 9.95%and 22.14%,respectively,compared with T.However,in the 20~60 cm soil layer,the total phosphorus content and the effective phosphorus content did not change significantly.Correlation analysis showed that the soil effective phosphorus content was positively correlated with soil organic carbon and soil moisture content,and negatively correlated with soil pH.【Conclusion】No-till+straw mulching is beneficial for the accumulation and improvement of total and effective phosphorus in the soil,and straw mulching may promote soil phosphorus activation and improve crop phosphorus use efficiency by affecting soil organic carbon,and soil moisture and pH.

关 键 词：保护性耕作 土壤磷组分 有机磷 无机磷 有效磷 

分 类 号：S143.2[农业科学—肥料学] S344[农业科学—农业基础科学]