摘要
为掌握不同土地利用方式下坡面土壤含水率的空间分布特征及其变异规律,利用经典统计学方法对黄土高原水蚀风蚀交错带草地和农地坡面土壤含水率的空间变异性进行了对比研究。结果表明:草地和农地的土壤含水率均值在同一土层深度下差异极显著,但二者在垂直方向、坡长方向的变异程度均为中等变异程度;草地和农地坡面土壤含水率的垂直变化特征不同,前者为降低型,后者在100 cm以上为波动型,以下为稳定型;草地和农地坡面土壤含水率均随坡长的增加呈波浪式变化规律,整体上有增加趋势;将坡面划分为5个坡长或将土层划分为4层以后,草地和农地坡面土壤含水率沿垂直方向、坡长方向的总体变化趋势均没有改变,但由于尺度的扩展获得了一些较大尺度上的水分信息。
To understand the spatial patterns of soil moisture in different land uses, spatial variability of soil moisture of grassland and cropland slope were comparatively studied by means of statistics in the wind-water erosion crisscross region on the Loess Plateau. Results show that the differences of average soil moisture in the same layers between grassland and cropland are significant at the 0. 01 level, but they have the same variable extent in profile and slope length direction, respectively. The profile change of soil moisture of grassland is different from that of cropland, the former was decreasing, while the latter was fluctuant（0～100 cm） and stable（100 ～200 cm）, respectively. The soil moisture strongly fluctuated with the increase of slope length for grassland and cropland. At different slope lengths and soil layers, the soil moisture has the same change trend at profile and slope length direction, and the increase of scale could obtain more information about soil moisture at larger scale.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2006年第12期65-71,共7页
Transactions of the Chinese Society of Agricultural Engineering
基金
西北农林科技大学科研创新团队
青年学术骨干和研究生教育创新支持计划项目
国家自然科学基金(40371076)
