免耕和秸秆覆盖对黑垆土磷素形态组分的影响
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教育部重大科技项目"黄土高原雨养农业区粮草轮作系统调控有害生物的关键机理研究"(313028);甘肃省重大科技专项"庆阳黄土高原生态治理和水资源高效利用的技术体系研究与示范"(1203FKDA035);教育部创新团队"草地农业系统耦合与管理"(IRT13019)


Effects of No-till and Stubble Retention on Phosphorus Fractions of Heilu Soil
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    [目的] 探究免耕及添加秸秆条件下黑垆土土壤磷组分特征及其与AM真菌侵染的关系,了解雨养农业区农业系统磷素利用效率。[方法] 在陇东黄土高原黑垆土区域,测定传统耕作、传统耕作+秸秆覆盖、免耕和免耕+秸秆覆盖4种处理小麦-玉米-大豆轮作系统中玉米阶段土壤全磷、速效磷组分及AM真菌菌根侵染率。[结果] 水土保持耕作处理实施9 a后,免耕和秸秆覆盖处理下0-5 cm土壤磷素含量显著提高,活性磷组分H2O-Pi,NaHCO3-Pi,NaOH-Pi分别比对照提高84.6%,85.2%和56.6%;活性无机磷(H2O-Pi, NaHCO3-Pi之和)和潜在活性磷(NaOH-Pi)分别占总无机磷的11.4%和4.5%,全磷含量与磷组分、速效磷与磷组分呈显著正相关,2个免耕处理菌根侵染率分别比对照增加20.8%和16.5%。[结论] 免耕和秸秆覆盖显著提高了土壤磷含量,免耕对AM真菌菌根侵染率有积极影响。

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    [Objective] The objectives of the study are to investigate the characteristics of soil phosphorus fractions on Heilu soil and its relationships with AM fungi colonization under no-till and stubble retention, in order to understand the phosphate use efficiency in rain feed agricultural system.[Methods] Total phosphorus, available phosphorus and phosphorus fraction and arbuscular mycorrhizal(AM) fungi colonization were determined using classical methods for maize crop under 4 tillage managements:conventional tillage, tillage +stubble retention, no-till, no-till +stubble retention in the Loess Plateau.[Results] After nine-year conservation tillage implementation, the content of P in soil layer of 0-5 cm increased. Compared to conventional tillage, the fraction of H2O-P, NaHCO3-Pi and NaOH-Pi was increased by 84.6%, 85.2% and 56.6%, respectively, under conservation tillage. Labile phosphorus(H2O-Pi, NaHCO3-Pi) and potential labile phosphorus(NaOH-Pi) accounted for 11.4% and 4.5% of total inorganic phosphorus. The total phosphorus showed a significantly positive correlation with available phosphorus and phosphorus fraction. Compared to conventional tillage, the AM fungi colonization increased by 20.8% and 16.5% under no-till manage ment.[Conclusion] The content of soil phosphorus was significantly improved under no-till and stubble retention, and the AM fungi colonization had a positive response to no-till.

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王玉平,郑丽娜,沈禹颖.免耕和秸秆覆盖对黑垆土磷素形态组分的影响[J].水土保持通报,2015,35(5):149-154

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  • 收稿日期:2014-08-19
  • 最后修改日期:2014-09-03
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  • 在线发布日期: 2016-04-05
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