中文摘要：

在马尾松林火烧迹地建立高强度、中强度、低强度火烧样地各12块（共36块）,9块火烧迹地附近的未烧样地,利用酒精溶液入渗法于2005年火灾后短期、灾后3个月和灾后12个月重复测定0～18 cm层土壤斥水性.结果表明：高强度和中强度火烧样地土壤表面土壤斥水性较强,土壤斥水性随着火强度的降低和土层深度的增加而下降;火灾后3个月内土壤斥水性有一个明显减弱的过程,火灾12个月后不同火强度火烧样地和未烧样地各土层深度土壤斥水性差异不显著,当土壤含水量达到一定值时无土壤斥水性;未烧样地、低强度火烧样地和中强度火烧样地土壤水分阈分别为10%、13%和28%.

英文摘要：

Soil＇s water repelleney is disadvantageous to sustainable development of forestry production and environment and thus causes disasters. The water repellency and soil moisture of 36 sites burned to high, mid and low severity and nine unburned sites nearby were periodically measured from December 2005 to December 2006. By quantifying the changes of water repellency immediately, three and twelve months after a fire with an ethanol droplet technique, the water repellency of all the sites was determined in field at the depths of 0 to 18 era. Results show that in sites burned to high and moderate severity, the water repellency is the strongest but decreasing with the increase of soil depth and the decrease of burned severity; that in three months after the fire it is apparently weakening and by 12 months it shows no statistically significant difference between burned and unburned sites at any depth; that there is no water repellency when soil moisture is high; and that the threshold of soil moisture is approximately 10% for unburned sites, 13% for sites burned to low severity and no less than 28% for sites burned to moderate severity.