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    污水灌溉下土壤孔隙特征的CT定量分析

    郭晓明 马腾 陈柳竹 刘林

    郭晓明, 马腾, 陈柳竹, 刘林, 2015. 污水灌溉下土壤孔隙特征的CT定量分析. 地球科学, 40(11): 1896-1903. doi: 10.3799/dqkx.2015.170
    引用本文: 郭晓明, 马腾, 陈柳竹, 刘林, 2015. 污水灌溉下土壤孔隙特征的CT定量分析. 地球科学, 40(11): 1896-1903. doi: 10.3799/dqkx.2015.170
    Guo Xiaoming, Ma Teng, Chen Liuzhu, Liu Lin, 2015. Quantitative Analysis of Soil Pores under Sewage Irrigation Using Computerized Tomography. Earth Science, 40(11): 1896-1903. doi: 10.3799/dqkx.2015.170
    Citation: Guo Xiaoming, Ma Teng, Chen Liuzhu, Liu Lin, 2015. Quantitative Analysis of Soil Pores under Sewage Irrigation Using Computerized Tomography. Earth Science, 40(11): 1896-1903. doi: 10.3799/dqkx.2015.170

    污水灌溉下土壤孔隙特征的CT定量分析

    doi: 10.3799/dqkx.2015.170
    基金项目: 

    国家重点基础研究发展计划(973计划)项目 2010CB428802

    国家自然科学基金项目 40872157

    国家自然科学基金项目 40830748

    高等学校博士学科点专项科研基金项目 20110145110003

    河南省高校科技创新团队支持计划 15IRTSTHN027

    详细信息
      作者简介:

      郭晓明(1982-), 男, 讲师, 博士, 从事水文地质相关教学工作, 主要从事包气带水文地质学的研究.E-mail: guoxiaoming@hpu.edu.cn

      通讯作者:

      马腾, E-mail: mateng@cug.edu.cn

    • 中图分类号: P641.1

    Quantitative Analysis of Soil Pores under Sewage Irrigation Using Computerized Tomography

    • 摘要: 污水中的悬浮物、盐分和有机营养物对土壤孔隙状况产生了深刻的影响.通过室内模拟和CT(computed tomography)扫描的方法, 定量研究污水灌溉条件下土壤孔隙数、孔隙度及形态特征.结果表明: 与对照点相比, 污水灌溉区上层土壤总孔隙数和大孔隙数(当量直径≥1.00 mm)均显著升高, 而下层土壤总孔隙数、大孔隙数、粗孔隙数(当量直径为0.26~1.00 mm)、总孔隙度、大孔隙度和粗孔隙度均显著降低(p<0.05);在模拟悬浮液和盐液灌溉条件下, 土壤总孔隙数、粗孔隙数和粗孔隙度均有所升高, 而大孔隙数、总孔隙度、大孔隙度和孔隙成圆率均有所降低; 在模拟营养液灌溉条件下, 土壤总孔隙数、大孔隙数、粗孔隙数和粗孔隙度均有所增加, 而孔隙成圆率有所降低; 对于研究区土壤来说, 悬浮液灌溉对土壤孔隙的影响效应强于盐液灌溉; 对于同种性质的污水灌溉来说, 污灌对对照点土壤孔隙的影响效应强于污灌区土壤.

       

    • 图  1  图像分析过程

      Fig.  1.  Process of CT image analysis

      表  1  不同灌区土壤的基本理化性质

      Table  1.   Basic physical and chemical properties of soils irrigated with sewage and groundwater

      灌区 层位(cm) pH 电导(μS·cm-1) 有机质(g·kg-1) Na+(mg·kg-1) Ca2+(mg·kg-1) CEC(cmol·kg-1) 粘粒(g·kg-1)
      污灌区 0~20 8.13 286 24.58 36.23 13.22 14.65 405
      20~40 8.19 293 11.60 32.50 20.17 13.33 345
      对照点 0~20 8.16 173 19.10 11.09 23.09 14.79 349
      20~40 8.59 206 8.99 14.44 24.62 15.10 342
      注:CEC.阳离子交换量(cation exchange capacity).
      下载: 导出CSV

      表  2  灌溉污水和灌溉地下水的基本性质

      Table  2.   Characteristics of sewage effluents and groundwater used for irrigation of agricultural soils

      pH 电导(μS·cm-1) SS(mg·L-1) 有机碳(mg·L-1) Na+(mg·L-1) Ca2+(mg·L-1) Mg2+(mg·L-1) SAR
      污水 7.7 1 599 293 136.9 162.5 107.7 30.6 3.5
      地下水 7.2 1 347 ND 16.7 46.2 139.8 52.9 0.8
      注:SS.悬浮物(Suspended solids);SAR.钠吸附比(sodium adsorption ratio);ND.未检测(not detected).
      下载: 导出CSV

      表  3  不同灌区土壤中孔隙参数统计均值

      Table  3.   Average numbers of soil pores attributes in the different irrigated fields

      下载: 导出CSV

      表  4  悬浮液灌溉条件下污灌区土壤中孔隙参数统计均值

      Table  4.   Average numbers of pores attributes in sewage irrigated soils under the condition of irrigation with suspension

      灌区 层位(cm) 孔隙数 孔隙度(%) 成圆率
      总孔隙数 大孔隙数 粗孔隙数 总孔隙度 大孔隙度 粗孔隙度
      污灌区 0~20 120b 61a 59b 3.17a 2.96a 0.21b 0.659b
      20~40 41c 18b 23d 0.60c 0.51c 0.08c 0.672a
      对照点 0~20 161a 54a 107a 2.14b 1.79b 0.34a 0.638c
      20~40 54c 16b 37c 0.48c 0.36c 0.12c 0.648bc
      下载: 导出CSV

      表  5  悬浮液灌溉条件下对照点土壤中孔隙参数统计均值

      Table  5.   Average numbers of pores attributes in groundwater irrigated soils under the condition of irrigation with suspension

      灌区 层位(cm) 孔隙数 孔隙度(%) 成圆率
      总孔隙数 大孔隙数 粗孔隙数 总孔隙度 大孔隙度 粗孔隙度
      污灌区 0~20 94b 41a 53c 2.70a 2.51a 0.18b 0.636ab
      20~40 94b 39a 54c 1.97b 1.78b 0.20b 0.645a
      对照点 0~20 136a 42a 95a 2.00b 1.69b 0.31a 0.625b
      20~40 95b 23b 73b 1.08c 0.84c 0.24b 0.630b
      下载: 导出CSV

      表  6  盐液灌溉条件下污灌区土壤中孔隙参数统计均值

      Table  6.   Average numbers of pores attributes in sewage irrigated soils under the condition of irrigation with salt solution

      灌区 层位(cm) 孔隙数 孔隙度(%) 成圆率
      总孔隙数 大孔隙数 粗孔隙数 总孔隙度 大孔隙度 粗孔隙度
      污灌区 0~20 88b 37a 51b 1.96a 1.78a 0.18b 0.654a
      20~40 26c 9b 17c 0.33b 0.26b 0.06c 0.656a
      对照点 0~20 129a 36a 93a 1.65a 1.37a 0.28a 0.626b
      20~40 33c 7b 26c 0.24b 0.16b 0.08c 0.638b
      下载: 导出CSV

      表  7  盐液灌溉条件下对照点土壤中孔隙参数统计均值

      Table  7.   Average numbers of pores attributes in groundwater irrigated soils under the condition of irrigation with salt solution

      灌区 层位(cm) 孔隙数 孔隙度(%) 成圆率
      总孔隙数 大孔隙数 粗孔隙数 总孔隙度 大孔隙度 粗孔隙度
      污灌区 0~20 91bc 36a 55b 2.02a 1.82a 0.20bc 0.641b
      20~40 80c 31ab 50b 1.54ab 1.36a 0.17c 0.658a
      对照点 0~20 119a 36a 83a 1.85a 1.59a 0.26a 0.621c
      20~40 101ab 27b 74a 1.03b 0.80b 0.23ab 0.633b
      下载: 导出CSV

      表  8  营养液灌溉条件下污灌区土壤中孔隙参数统计均值

      Table  8.   Average numbers of soil pores attributes in sewage irrigated soils under the condition of irrigation with nutrient solution

      灌区 层位(cm) 孔隙数 孔隙度(%) 成圆率
      总孔隙数 大孔隙数 粗孔隙数 总孔隙度 大孔隙度 粗孔隙度
      污灌区 0~20 112b 47b 65b 3.05a 2.81a 0.23b 0.661a
      20~40 48c 16c 32c 0.60b 0.49b 0.11c 0.651ab
      对照点 0~20 175a 59a 116a 2.93a 2.55a 0.37a 0.627c
      20~40 57c 19c 39c 0.80b 0.67b 0.13c 0.642b
      下载: 导出CSV

      表  9  营养液灌溉条件下对照点土壤中孔隙参数统计均值

      Table  9.   Average numbers of soil pores attributes in groundwater irrigated soils under the condition of irrigation with nutrient solution

      灌区 层位(cm) 孔隙数 孔隙度(%) 成圆率
      总孔隙数 大孔隙数 粗孔隙数 总孔隙度 大孔隙度 粗孔隙度
      污灌区 0~20 93b 40b 53b 2.30a 2.12a 0.19b 0.660a
      20~40 36d 15c 22c 0.53b 0.46b 0.07c 0.666a
      对照点 0~20 177a 57a 120a 2.70a 2.30a 0.40a 0.630b
      20~40 66c 18c 48b 0.79b 0.64b 0.15b 0.639b
      下载: 导出CSV
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