地理科学 ›› 2001, Vol. 21 ›› Issue (2): 118-122.doi: 10.13249/j.cnki.sgs.2001.02.118

• 论文 • 上一篇    下一篇

黄土丘陵区小流域土壤表面特性变化规律研究

张光辉1, 刘国彬2   

  1. 1. 北京师范大学资源与环境科学系, 北京 100875;
    2. 中国科学院水利部水保所, 陕西 杨陵 712100
  • 收稿日期:2000-01-20 修回日期:2000-06-04 出版日期:2001-03-20 发布日期:2001-03-20
  • 基金资助:
    国家杰出青年科学基金资助项目(49725103)、国家自然科学青年基金(40001014)资助。

Spatial and Temporal Variability of Soil Surface Properties in DanangouCatchment in Loess Hill and Hilly Region

ZHANG Guang-hui1, LIU Guo-bin2   

  1. 1. Department of Resource and Environmental Sciences, Beijing Normal University, Beijing 100875;
    2. Institute of Soil and Water Conservation, Chinese Academy of Sciences, Yangling, Shaanxi 712100
  • Received:2000-01-20 Revised:2000-06-04 Online:2001-03-20 Published:2001-03-20

摘要: 土壤表面特性是建立流域土壤侵蚀模型的重要参数,为建立适合黄土高原的流域侵蚀模型,采用随机糙率仪、微型粘结力仪及常水头滴定法,系统研究了黄土丘陵区大南沟小流域不同土地利用条件下,地面随机糙率、土壤粘结力和土壤团粒稳定性的时空变化规律。结果表明受农事活动、植物及其根系分布、有机质含量等因素的影响,流域内土壤表面特性变化显著,在流域水土保持措施配置时应予以充分考虑。

Abstract: In order to establish the suitable soil erosion model for the loess hilly region of Loess Plateau, one typical catchment is selected, and a lot of experiments are carried out in this catchment. Soil surface properties are the basic input information and have very significance for establishing soil erosion model at catchment level. The spatial and temporal variability of soil surface properties of different land use system were analyzed by means of roughness meter, micro cohesion meter, and constant pressure head method. The results indicate that the random roughness (RR) change very largely due to the effect of tillage, fertilizing, plant, harvest and so on. The RR of farmland is the highest among 5 kinds of land use and is 1.05, 2.10, 1.70, 1.95 times to orchard, woodland, shrub and wasteland respectively. The soil cohesion of wasteland and shrub varied very sharply and had no significant change in woodland, farmland, and orchard. Wasteland had the highest cohesion and then is shrub, woodland, orchard and farmland, and the measured data are 0.222, 0.144, 0.097, 0.084, and 0.068 kg/cm2. Organic matter content is the main factor, which influence soil aggregated stability. The organic content is different in different land use and due to its impact, the variability of aggregated stability changed widely. From high to low, the turn was woodland, shrub, orchard, farmland and wasteland respectively. The average measured data were 6.38, 4.01, 3.64, 3.62 and 3.06. The measured results indicated that because the farmland had low soil cohesion and aggregated stability, the serious soil erosion is very easy happening when heavy storm takes place. Therefore, more attention should be paid to farmland for soil conservation purpose. Meanwhile, the wasteland also has low aggregated stability, when runoff covers waste ground, the soil is very easy to be disposed. So a great of attention need be paid to the wasteland at the same time when soil and water comprehensive control measure is designed.

中图分类号: 

  • S157.1