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免耕对土壤剖面孔隙分布特征的影响

杨永辉 武继承 毛永萍 何方 张洁梅 高翠民 潘晓莹 王越

杨永辉, 武继承, 毛永萍, 何方, 张洁梅, 高翠民, 潘晓莹, 王越. 免耕对土壤剖面孔隙分布特征的影响[J]. 中国生态农业学报(中英文), 2018, 26(7): 1019-1028. doi: 10.13930/j.cnki.cjea.171093
引用本文: 杨永辉, 武继承, 毛永萍, 何方, 张洁梅, 高翠民, 潘晓莹, 王越. 免耕对土壤剖面孔隙分布特征的影响[J]. 中国生态农业学报(中英文), 2018, 26(7): 1019-1028. doi: 10.13930/j.cnki.cjea.171093
YANG Yonghui, WU Jicheng, MAO Yongping, HE Fang, ZHANG Jiemei, GAO Cuimin, PAN Xiaoying, WANG Yue. Effect of no-tillage on pore distribution in soil profile[J]. Chinese Journal of Eco-Agriculture, 2018, 26(7): 1019-1028. doi: 10.13930/j.cnki.cjea.171093
Citation: YANG Yonghui, WU Jicheng, MAO Yongping, HE Fang, ZHANG Jiemei, GAO Cuimin, PAN Xiaoying, WANG Yue. Effect of no-tillage on pore distribution in soil profile[J]. Chinese Journal of Eco-Agriculture, 2018, 26(7): 1019-1028. doi: 10.13930/j.cnki.cjea.171093

免耕对土壤剖面孔隙分布特征的影响

doi: 10.13930/j.cnki.cjea.171093
基金项目: 

国家重点研发计划项目 2017YFD0301102

国家自然科学基金项目 U1404404

河南省农业科学院优秀青年科技基金项目 2016YQ12

河南省重点研发与推广专项 182102110060

详细信息
    作者简介:

    杨永辉, 主要研究方向为土壤物理与节水农业。E-mail:yangyongh@mails.gucas.ac.cn

  • 中图分类号: S152.5

Effect of no-tillage on pore distribution in soil profile

Funds: 

the National Key R&D Project of China 2017YFD0301102

the National Natural Science Foundation of China U1404404

the Excellent Youth Science and Technology Fund of Henan Academy of Agricultural Sciences 2016YQ12

Henan Province Key R&D and Extension Project 182102110060

More Information
  • 摘要: 探明长期免耕措施对土壤孔隙特征、土壤结构及土壤水分参数等影响,可为阐明在小麦、玉米轮作过程中,长期进行免耕对土壤剖面物理特征的改善及其作用机理提供科学依据。采用CT扫描法定量分析了免耕和常规耕作0~100 cm土层土壤孔隙(80~1 000 μm、 > 1 000 μm、 > 80 μm)的数目、孔隙度及孔隙在土壤剖面上的分布特征,同时采用常规方法测定了土壤大团聚体、土壤容重、有效水含量及饱和导水率等。结果表明:长期免耕不仅提高了土壤 > 1 000 μm、80~1 000 μm、 > 80 μm孔隙数,且其孔隙度也相应提高,较常规耕作孔隙数分别提高55.3%、58.2%、57.9%,孔隙度分别提高97.4%、39.4%、72.6%。同时土壤孔隙形态也得到了改善,孔隙成圆率提高。对不同土层而言,免耕更利于提高0~25 cm土层80~1 000 μm和 > 80 μm孔隙数以及0~45 cm土层 > 1 000 μm孔隙数,且显著提高了0~20 cm和25~40 cm土层 > 1 000 μm、 > 80 μm及0~20 cm土层80~1 000 μm的土壤孔隙度。说明长期免耕对土壤剖面孔隙的分布产生一定影响。此外,免耕提高了0~25 cm土层土壤的有效水含量、0~55 cm土层饱和导水率和 > 0.25 mm水稳性团聚体含量,降低了土壤容重,其作用深度在55 cm以上土层。通过CT扫描测得的土壤孔隙参数与常规方法测定的土壤物理参数之间存在极好的相关性,说明可从微观土壤孔隙特征来表征宏观的土壤物理性质。总之,长期免耕有利于改善土壤结构和土壤孔隙状况,提高土壤的渗透能力及土壤水分的有效性,促进作物的生长。
  • 图  1  CT扫描土壤示意图

    Figure  1.  Scheme of CT scanning soil

    图  2  不同耕作措施对0~100 cm土体 > 1 000 μm和80~1 000 μm孔隙数目、孔隙度及孔隙成圆率的影响

    不同小写字母表示不同耕作措施间差异显著。

    Figure  2.  Number, porosity and circularity of > 1 000 μm and 80-1 000 μm pores under different tillage treatments in 0-100 cm soil layer

    Different lowercase letters show significant differences between two tillage treatments.

    图  3  不同耕作措施下不同土层 > 80 μm、 > 1 000 mm和80~1 000 μm孔隙的数目

    Figure  3.  Numbers of > 80 μm, > 1 000 μm and 80-1 000 μm pores under different tillage treatments in different soil layers

    图  4  不同耕作措施不同土层 > 80 μm、 > 1 000 mm和80~1 000 μm孔隙的孔隙度

    Figure  4.  Porosities of > 80 μm, > 1 000 μm and 80-1 000 μm pores under different tillage treatments in different soil layers

    图  5  不同耕作措施对不同土层土壤 > 0.25 mm团聚体含量及容重的影响

    Figure  5.  Effects of different tillage treatments on > 0.25 aggregates content and soil bulk density in different soil layers

    图  6  不同耕作措施对不同土层土壤有效水含水量及饱和导水率的影响

    Figure  6.  Effects of different tillage treatments on available water content and saturated hydraulic conductivity in different soil layers

    表  1  土壤孔隙特征与土壤团聚体含量及容重和含水量间的相关性

    Table  1.   Correlation between soil pore characters and soil aggregates content, bulk density and water content

    孔隙度Porosity 孔隙数目Pore number
    > 80 μm > 1 000 μm 80~1 000 μm > 80 μm > 1 000 μm 80~1 000 μm
    > 0.25 mm水稳性团聚体含量
    > 0.25 mm water stable aggregate content
    0.63** 0.64** 0.58** 0.66** 0.67** 0.65**
    土壤容重Soil bulk density -0.82** -0.77** -0.80** -0.82** -0.77** -0.82**
    饱和导水率Saturated hydraulic conductivity 0.88** 0.83** 0.84** 0.86** 0.76** 0.85**
    有效水含量Available water content 0.86** 0.84** 0.78** 0.85** 0.83** 0.84**
      **表示相关性达显著水平P < 0.01。** indicates significant correlation at 0.01 level (LSD test).
    下载: 导出CSV
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出版历程
  • 收稿日期:  2017-11-27
  • 录用日期:  2018-02-22
  • 刊出日期:  2018-07-01

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