免耕轮作对旱作区土壤水热动态及速效养分含量的影响

发布时间：2018-03-20 12:14

  本文选题：耕作方式　切入点：轮作方式　出处：《中国土壤与肥料》2016年06期 　论文类型：期刊论文

【摘要】：免耕轮作对土壤性质有明显改善作用。在免耕秸秆覆盖基础上进行燕麦、玉米、大豆3种作物轮作2个周期的试验研究。结果表明,免耕秸秆覆盖结合不同作物轮作能调节土壤水热环境,增加土壤速效养分含量。土壤贮水量在不同处理间总体表现为免耕留高茬覆盖(NHS)免耕留低茬覆盖(NLS)免耕留高茬(NH)免耕留低茬(NL)常规翻耕(T),3种轮作方式中均以燕麦-大豆-玉米方式最高。轮作2个周期后NHS、NLS、NH、NL分别较T土壤贮水量在作物苗期增加了16.24%、12.16%、8.75%、5.56%,可见免耕覆盖能明显提高土壤水分蓄储能力。土壤温度在0~5 cm土层受外界环境影响最大;免耕覆盖在低温时起"保温作用",能提高土壤温度1.4~2.4℃;高温时起"降温作用",能降低土壤温度1.8~3.4℃;秸秆覆盖后土壤温度日变化平缓。同时免耕结合轮作处理能不同程度增加土壤有机质及速效养分含量,说明免耕轮作在该地区能较大程度的改善土壤性质,为提高作物产量提供了基础和有效保证。
[Abstract]:On the basis of no-tillage straw mulch, three crop rotation periods of oat, corn and soybean were studied. No tillage straw mulching combined with different crop rotation can regulate soil water and heat environment. Soil water storage in different treatments showed that no tillage with high stubble mulching (NLSs) no-tillage with low stubble mulch (no tillage with high stubble and low stubble with NLL) with no tillage with low stubble (NLL) with conventional tillage and three rotation cropping methods of oat were used. NHSN NLSN NH N N N + N N N. The no-tillage mulch can increase the soil temperature by 1.4 ~ 2.4 鈩，

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