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该文以福建省为研究区域,基于“3S”技术与野外调查相结合,提取土地利用、植被覆盖度和坡度分级等信息,生成1995年、2000年和2007年水土流失现状图,并采用地统计模型计算三个年份水土流失强度。结果表明:福建省水土流失强度可用球状模型拟合,其方向大致呈北北东-南南西走向,与地形走向大致一致;水土流失强度的基台值不断减少,整体向轻度化和均质化方向发展。1995年福建省水土流失强度的结构方差所占比例为12.31%,块金方差所占比例为87.69%,2000年分别为3.51%和96.49%,2007年分别为2.94%和97.06%,块金方差占主导地位且呈上升趋势,表明水土流失强度受多种因素综合影响且影响不断加强,其中重要因素之一是人为活动;小尺度上人为活动等随机性因素为主导因素,中尺度上反之。
Based on the “3S” technology and field investigation in Fujian Province, this paper extracts information such as land use, vegetation coverage and slope classification to generate the status quo of soil and water loss in 1995, 2000 and 2007 Geostatistical model was used to calculate soil erosion intensity in three years. The results show that the intensity of soil and water erosion in Fujian Province can be fitted by the spherical model, and the direction of the soil erosion is roughly north-north east-south-south-west, which is roughly consistent with the terrain trend. The abutment value of soil erosion intensity decreases continuously, The direction of development. The structural variance of soil erosion intensity in Fujian Province was 12.31% in 1995, while the proportion of nugget variance was 87.69% in 2000, 3.51% and 96.49% in 2000 and 2.94% and 97.06% in 2007 respectively. The nugget variance Dominance and upward trend, indicating that the strength of soil and water loss is affected by the combination of many factors and their impacts are continuously strengthened. One of the important factors is man-made activities. The random factors such as man-made activities at the small scale are the dominant factors and the mesoscale ones are the contrary.