黄土丘陵区林草景观界面雨后土壤水分空间变异规律

应用生态学报 ›› 2005, Vol. 16 ›› Issue (9): 1591-1596.

黄土丘陵区林草景观界面雨后土壤水分空间变异规律

尤文忠^1,2, 曾德慧¹, 刘明国², 宋西德³, 叶彦辉³, 张永³

1. 中国科学院沈阳应用生态研究所, 沈阳 110016;
2. 沈阳农业大学林学院, 沈阳 110161;
3. 西北农林科技大学林学院, 杨凌 712100

收稿日期:2005-04-23 修回日期:2005-05-25 出版日期:2005-09-15 发布日期:2005-09-15
通讯作者: 曾德慧
基金资助:
国家重点基础研究发展规划资助项目(2002CB111506).

Spatial heterogeneity of soil moisture after raining at forest-grassland landscape boundary in hilly area of Loess Plateau

YOU Wenzhong^1,2, ZENG Dehui¹, LIU Mingguo², SONG Xide³, YE Yanhui³, ZHANG Yong ³

1. Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China;
2. College of Forestry, Shenyang Agricultural University, Shenyang 110161, China;
3. College of Forestry, Northwest Sci-Tech University of Agriculture and Forestry, Yangling 712100, China

Received:2005-04-23 Revised:2005-05-25 Online:2005-09-15 Published:2005-09-15

摘要/Abstract

摘要： 对黄土丘陵区刺槐林-草地景观界面上雨后土壤表层(0～10 cm)和亚表层(10～20 cm)水分的空间变异规律进行了研究.经典统计学分析表明,草地两层的土壤含水量分别高于林地;林草界面两层的土壤含水量均为弱变异程度,并具有明显的生态梯度.移动窗口法分析表明,林草界面对土壤表层和亚表层的水分影响范围为边界两侧4 m、3 m,影响域分别为8 m、6m.地统计学分析表明,草地两层土壤含水量空间分布均表现为纯块金效应,林地两层均可拟合成线性模型,而林草界面两层均可拟合成球状模型;林草界面土壤表层、亚表层水分空间依赖性和空间自相关较强,其空间结构异质性明显高于林地和草地.克立格制图描述的林草界面土壤水分的空间分布格局为从边界处向两侧的一定距离范围内,土壤含水量呈条带状分布,而在较远的距离,水分的空间分布呈现出几个明显的斑块状.

关键词: 森林-草地界面, 土壤水分, 地统计学, 分布格局

Abstract: Soil moisture is a main factor limiting vegetation restoration in semi-arid region.In this paper,the spatial variability of different layers soil moisture after raining at the forest-grassland boundary in hilly area of Loess Plateau were studied by traditional and geostatistical analysis methods.The results showed that the moisture content in surface (0～10 cm) and subsurface soil layer (10～20 cm) of grassland was higher than that of forestland.The two layers soil moisture content at forest-grassland boundary showed a small variation but an obvious ecological distribution.By using moving split-window techniques,it was obtained that the width of edge influence in surface and subsurface layer was 8 and 6 m,respectively.Geostatistical analyses showed that the spatial distribution of two layers soil moisture had a pure nugget effect in grassland,linear model in forestland,and spherical model in forest-grassland boundary.The spatial heterogeneity of two layers soil moisture was higher at forest-grassland boundary than at forestland and grassland,which had a stronger spatial dependence and autorelation.Kriging maps expressed the spatial structural characters.The distribution of soil moisture in two layers showed a strip shape near forest edge,and a patch shape far from the edge.

Key words: Forest-grassland boundary, Soil moisture content, Geostatistics, Spatial distribution

中图分类号:

S152.7

尤文忠, 曾德慧, 刘明国, 宋西德, 叶彦辉, 张永. 黄土丘陵区林草景观界面雨后土壤水分空间变异规律[J]. 应用生态学报, 2005, 16(9): 1591-1596.

YOU Wenzhong, ZENG Dehui, LIU Mingguo, SONG Xide, YE Yanhui, ZHANG Yong . Spatial heterogeneity of soil moisture after raining at forest-grassland landscape boundary in hilly area of Loess Plateau[J]. Chinese Journal of Applied Ecology, 2005, 16(9): 1591-1596.

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