欢迎访问《生态学杂志》官方网站,今天是 分享到:

生态学杂志

• 研究报告 • 上一篇    下一篇

黄土丘陵沟壑区小流域土壤水分空间变异

王晓军,武江涛,王兵**,温奋翔   

  1. (山西大学环境与资源学院, 太原 030006)
  • 出版日期:2015-09-10 发布日期:2015-09-10

Spatial variability of soil moisture in hilly and gully Loess Plateau.

WANG Xiao-jun, WU Jiang-tao, WANG Bing**, WEN Fen-xiang   

  1. (College of Environmental Science and Resources, Shanxi University, Taiyuan 030006, China)
  • Online:2015-09-10 Published:2015-09-10

摘要: 采用经典统计学和地统计学相结合的方法探讨了黄土丘陵沟壑区小流域土壤水分(0~300 cm)水平和垂直方向的空间变异特征,以及土地利用和地形因子对其影响规律。结果表明:(1)土壤水分的垂直变化表现为先降低后增加;变异系数为11.22%~21.05%,具有中等程度变异,土壤水分平均值与变异系数之间呈显著负相关。(2)梯田的层状分布和微地形的存在削弱了土壤水分在水平方向上的空间相关性;水平方向变程范围在19~102 m,增加采样密度能增加土壤水分的空间结构信息;(3)土壤水分在垂直方向上存在强烈或中等程度的空间自相关;垂直方向的变程的范围为0.67~2.64 m;(4)不同环境因子基台值的变化格局与平均土壤含水量相反,水分的增加对基台值有一定的平滑效应;不同土地利用类型对土壤水分垂直变异影响程度依次为荒草地>林地>退耕地>耕地,而坡位则表现为梁>沟谷。

关键词: 季节动态, 非结构性碳水化合物, 林层, 季风常绿阔叶林

Abstract: By using the methods of classical statistics and geostatistics, the paper studied the spatial variation of soil moisture (0-300 cm) in horizontal and vertical direction, and the effects of land use and terrain factors in a small watershed in hilly and gully Loess Plateau. The results showed that: (1) Soil moisture content in vertical direction presented a trend of decrease to increase, and the coefficient of variation ranged from 11.22% to 21.05%. There was a significant negative correlation between soil moisture content and the coefficient of variation. (2) The layered distribution of terraces and the slope terrain weakened the spatial autocorrelation of soil moisture in horizontal direction. The variation range was from 19 to 102 m. Increasing sampling density could improve the spatial structure information of soil moisture. (3) There was a strong or moderate spatial autocorrelation of soil moisture in vertical direction, with the variation range from 0.67 to 2.64 m. (4) The sill values of different environmental factors showed an opposite variation trend with the average soil water content. The increase of moisture content had certain smoothing effect on the sill value. The impacts of different land use types on the vertical variation of soil moisture were in order of grassland > woodland > abandoned farmland > cultivated land, while ridge > valley for slope position.

Key words: monsoon broad-leaved evergreen forest, non-structural carbohydrate, seasonal dynamic, forest layer