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生态学杂志 ›› 2009, Vol. 28 ›› Issue (10): 2014-2019.

• 研究报告 • 上一篇    下一篇

雨强和土地利用对黄土丘陵区径流系数及蓄积系数的影响

李 广1;黄高宝2**   

  1. 1甘肃农业大学信息科学技术学院,兰州 730070;2甘肃农业大学农学院,兰州 730070
  • 出版日期:2009-11-10 发布日期:2009-11-10

Effects of rainfall intensity and land use on rainfall runoff and storage in Loess hilly region.

LI Guang1|HUANG Gao-bao2   

  1. 1College of Information Science and Technology, Gansu Agricultural University, Lanzhou, 730070, China;2College of Agronomy, Gansu Agricultural University,Lanzhou, 730070, China
  • Online:2009-11-10 Published:2009-11-10

摘要: 利用人工降雨模拟器,设计不同降雨强度和土地利用方式的区组实验,定量研究了黄土丘陵区雨强和土地利用对降雨产流和蓄积的影响。结果表明:不同雨强对土地利用平均径流系数呈极显著的正效应,雨强与径流系数呈负指数函数关系;不同雨强对土地利用平均蓄积系数也有显著的影响,雨强为1.97、2.14、2.46、2.94和3.75 mm·min-1条件下,土地利用平均蓄积系数分别为0.73、0.62、0.58、0.55和0.44;不同雨强平均径流系数为林地>耕地>栽培草地>天然草地;林地、天然草地、栽培草地和耕地的降雨蓄积系数分别为0.44、0.68、0.66和0.55。在黄土丘陵生态脆弱区草地具有良好的降雨蓄积效果,同时表明林冠层、灌木层和枯枝落叶层对降雨的截留、阻滞和削弱具有显著功效。

关键词: 土地利用/覆被变化, 土壤养分, 土壤质量, 植被恢复, 生态重建

Abstract: By using rainfall simulator, an experiment was conducted to quantitatively study the rainfall runoff and storage in Loess Hilly region under effects of different rainfall intensity and land use. Rainfall intensity had significant effects on the rainfall runoff, and there was a negative exponential relationship between rainfall intensity and runoff coefficient. Rainfall intensity also hadsignificant effects on rainfall storage. When the rainfall intensity was 1.97, 2.14, 2.46, 2.94, and 3.75 mm·min-1, the average storage coefficientof land use was 0.73, 0.62, 0.58, 0.55, and 0.44, respectively. The average runoff coefficient of different rainfall intensities was in the order of forestland>cultivated land>artificial grassland>natural grassland, and the runoff storage coefficient of forestland, natural grassland, artificial grassland, and cultivated land was 0.44, 0.68, 0.66, and 0.55, respectively. In the ecologically fragile Loess hilly region, grassland showed good effects in water and soil conservation, and the canopy, shrub, and litter layers on forestland had significant effects in intercepting, retarding, and reducing rainfall.

Key words: Land use/cover change, Soil nutrients, Soil quality, Vegetation restoration, Ecological reconstruction