地理学报 ›› 2000, Vol. 55 ›› Issue (1): 84-91.doi: 10.11821/xb200001009

• 论文 • 上一篇    下一篇

黄土丘陵小流域土地利用结构对土壤水分时空分布的影响

王军, 傅伯杰   

  1. 中国科学院生态环境研究中心,北京100085
  • 收稿日期:1999-03-10 修回日期:1999-04-12 出版日期:2000-01-15 发布日期:2000-01-15
  • 基金资助:
    国家杰出青年科学基金(49725101); 欧洲联盟资助 (ERBIC18CT970158)

The impact of land use on spatial and temporal distribution of soil moisture on the Loess Plateau

WANG Jun, FU Bo jie   

  1. Research Center for Eco Environmental Sciences, Chinese Academy of Sciences, Beijing 100085
  • Received:1999-03-10 Revised:1999-04-12 Online:2000-01-15 Published:2000-01-15
  • Supported by:
    the National Natural Science Foundation of China,No.49725101;INCO-DC of European Commission,No.ERBIC18CT970158

摘要: 本项研究选择黄土丘陵沟壑区5 种典型土地利用结构和7 种主要土地利用类型从1998年5 月到10 月每两周测定一次土壤水分,探讨了土地利用结构和类型对土壤水分时空分布的影响。研究结果表明,土壤水分年内季节变化呈现出三峰三谷; 林地和间作地对土壤水分有滞后作用; 垂直梯度变化可归纳为增长型、降低型和波动型。通过分析5 种土地利用结构对坡面土壤水分的影响,提出了调整土地利用结构与布局、发展农果间作和培育深根性植物是黄土丘陵区水土保持及提高土壤水分利用率的有效途径。

关键词: 黄土丘陵区, 土壤水分, 土地利用结构, 土地利用类型

Abstract: Soil moisture is a key factor for hydrological processes, plant growth and vegetation rehabitation in semi arid environments. A better understanding of the characteristics of soil moisture differentiation in space and time is important for improving hydrological processes and land management in both runoff and erosion control. However, the knowledge about spatial and temporal variability of soil moisture for different land use types and structures is rare in the hilly area of Loess Plateau of China. In order to analyze the relationships between land uses and soil moisture in space and time, five representative land use structures and seven land use types were selected to monitor soil moisture in Da Nangou catchment (3 5 km\+2) in Loess Plateau from May to October, 1998. The five land use structure combinations from top to foot of the hillslope were: cropland - cropland - cropland, cropland - woodland - orchard, fallow land - grassland - cropland, fallow land - shrubland - intercropping land - woodland and fallow land - shrubland - cropland - orchard. Soil moisture measurements have been performed biweekly at about 26 locations. The measurements were carried out on regular plot by using portable Time Domain Reflectometry (TDR) at five depths: 5 cm, 15 cm, 25 cm, 40 cm and 70cm. Based on above data, the spacial and temporal distribution of soil moisture are analyzed in seven land use types. The results showed that the changes of soil water content presented 3 peaks and 3 valleys during growing season and that the lag influence on soil moisture was found in woodland and intercropping land. Soil moisture changes of profile can be clustered into three groups, they are increasing, decreasing and fluctuant. The effect of five land use structures on soil moisture along hillslope were analyzed, two better land use structures for runoff and erosion control, were put forward, they were fallow land - shrubland - intercropping land (terrace)-woodland and fallow land - shrubland - cropland (terrace) - orchard. At the same time, benching terrace for crop-fruit tree intercropping system and breeding for deep-root plants were proven to be effective approaches in soil and water conservation in hilly area of loess.

Key words: hilly loess, soil moisture, land use structure, land use type

中图分类号: 

  • S152.7