【摘要】 文章以夏季、春季两个季节对黄土丘陵区林-草边界不同层次深度土壤温度的水平梯度分布特征作了比较分析,并应用DEI(5%)法对边界进行定量判定。结果表明:林地各层次土壤温度一般都低于草地;土壤温度的最高值一般出现在16:00左右;边界不同层次土壤温度水平分布在日变化不同时间上具有相似的形态特征;林-草边界土壤温度在夏季与春季具有不同形态的水平分布特征;林缘处土壤温度在夏季处于中等水平,而在春季处于最高水平;夏季林-草边界边缘效应的宽度为8～16m、边缘效应宽度的最大值一般出现在12:00～16:00,春季林-草边界边缘效应的宽度为6～12m、边缘效应宽度的最大值一般出现在10:00～12:00。更多还原

【Abstract】 In this paper,the distribution pattern of different depth of soil temperature along transect gradients across the boundary of forestland-grassland in hilly area of Loess Plateau was studied in summer of June 2004 and spring of April 2005.By methods of 5% DEI,quantitative determination of the width of edge effect was made.The results showed that the soil temperature at forestland was lower than that at grassland.The maximal value of soil temperature emerged at 16:00 pm.The similar horizontal distribution shapes of soil temperature across the boundary were observed at different times in a day.Across forest-grassland,soil temperature at forest edge was in middle degree in summer and in the most degree in spring.Across forest-grassland boundary,the width of edge effects of soil temperature was proved to be 8～16m in summer and 6～12m in spring respectively,which the most edge effect value emerged from 12:00 to 16:00 in summer and from 10:00 to 12:00 in spring.更多还原