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中国农学通报 ›› 2017, Vol. 33 ›› Issue (7): 128-133.doi: 10.11924/j.issn.1000-6850.casb16050006

所属专题: 农业气象

• 资源 环境 生态 土壤 气象 • 上一篇    下一篇

岷江上游干旱河谷区林-农-草地土壤水分特征与数值模拟

唐香君,郭亚琳,樊敏,王青,赵丽   

  1. 西南科技大学环境与资源学院东7B-501,四川绵阳,621010,西南科技大学环境与资源学院东7B-501,四川绵阳,621010,西南科技大学环境与资源学院东7B-501,四川绵阳,621010,西南科技大学环境与资源学院东7B-501,四川绵阳,621010,西南科技大学环境与资源学院东7B-501,四川绵阳,621010
  • 收稿日期:2016-05-03 修回日期:2017-01-18 接受日期:2016-06-24 出版日期:2017-03-16 发布日期:2017-03-16
  • 通讯作者: 赵丽
  • 基金资助:
    四川省科技厅科技支撑项目“地震灾区生态恢复与灾害防治关键技术研究”(2014SZ0058);四川省科技厅科技支撑项目资助“岷江上游山 区农业生产区施肥对生态环境演变的响应特征”(15zx2104);四川省教育厅项目“岷江上游土壤环境质量对退耕还林驱动的林树下线下移的响应” (16ZB0139)。

Moisture Characteristics and Numerical Simulation of Forest-farmland-grassland Soil in Arid Valley Region in the Upper Reaches of Min River

  • Received:2016-05-03 Revised:2017-01-18 Accepted:2016-06-24 Online:2017-03-16 Published:2017-03-16

摘要: 岷江上游干旱河谷土壤水分是农业生产和生态修复的关键因子。以干旱河谷典型区生态林、经果林、农地和荒草地4类土壤含水量为研究对象,通过对4类土壤含水量的变化分析和数值模拟,揭示土壤水分与土层深度的关系。结果表明:1)土壤平均含水量依次为:农地(18.62%)>生态林(17.47%)>经果林(16.53%)>荒草地(11.25%);2)从干旱河谷(1500 m)到天然林下线(2500 m)的山地垂直方向上,林地土壤含水量呈浅U型分布;海拔2100~2500 m土壤含水量均值为19.77%,海拔1900~2100 m为13.72%,海拔1500~1900 m为16.00%;3)土壤水分随土层深度的增加而减少,生态林土壤水分垂直变化最为显著,农地土壤水分垂直变化则相对稳定;4)土壤水分多水平贝叶斯模型,能够较好地说明4种土地利用类型下土壤含水量的变化和剖面分布特征;5)林地与荒草地土壤含水量差异表明,土壤平均含水量14%是界定林-草地的分界值。研究结果可为岷江上游干旱河谷生态修复提供数据支撑。

关键词: 复合改良剂, 复合改良剂, 风成沙, 土壤稳定凋萎含水量

Abstract: Soil moisture content in arid valley region in the Upper Reaches of Min River is the key factor of agricultural production and ecological restoration.The soil moisture contents of four typical land use types (ecological forest,economic forest,cropland,wild grass ground) were investigated,and variation analysis and numerical simulation .of soil moisture content was carried to reveal relationship of soil moisture and soil depths. The results showed that: 1) The average content of soil moisture was ranked as follow:cropland(18.62%) > ecological forest(17.47%) > economic forest(16.53%) > wild grass ground(11.25%); 2) In vertical direction from the dry valley (1500 m) to timberline of the natural forest (2500 m), soil moisture content of forest land shows distribution characteristics of shallow U shape; Soil moisture average content was 19.77% at the altitudes 2100~2500 m area,13.72% at 1900~2100 m and 16.00% at 1700~1900 m; 3) In profile, soil water contents of the four land use types decreased with the increases of soil depth. The vertical changes of soil moisture content in ecological forest land and cropland partly were the most significant and relatively stable: 4) The soil moisture model for the research area was good to illuminate variation and profile distribution characteristics of soil moisture content; 5) Differences of forest land and wild grass ground show that average content of soil moisture with 14% was boundary value of forest land and wild grass ground.The research results can provide data support for ecological restoration in the upper reaches of Min River.