Remote sensing of land use/cover changes and its effect on wind erosion potential in southern Iran.
Remote sensing of land use/cover changes and its effect on wind erosion potential in southern Iran.
复制标题
DOI：
10.7717/peerj.1948
复制
发表时间：
2016
期刊：
影响因子：
2.7
通讯作者：
Bartholomeus H
中科院分区：
文献类型：
--
作者：
Rezaei M;Sameni A;Fallah Shamsi SR;Bartholomeus H
风蚀是一个受多种因素影响的复杂过程。大多数这些因素随着时间的推移是稳定的，但土地利用/覆盖和土地管理实践正在逐渐变化。因此，本研究调查了土地利用/覆盖和土地管理的变化对伊朗南部风蚀潜力的影响。我们使用遥感数据（2004 年和 2013 年的 Landsat ETM+ 和 Landsat 8 图像）进行土地利用/覆盖绘图，并采用伊朗森林和牧场研究所 (IRIFR) 方法来估计风蚀潜力的变化。为了获得最佳映射，测试了不同分类算法和输入层的性能。使用两年之间的交叉制表对风蚀和土地利用/覆盖的变化量进行量化。为了区分与风蚀相关的土地利用/覆盖，通过将原始光谱波段与合成波段相结合并使用最大似然分类算法（Landsat ETM+ 和 Landsat 8 的 Kappa 系数分别为 0.8 和 0.9）获得了最佳结果。 IRIFR 模拟结果表明，风蚀潜力在过去十年中有所增加。产沙潜力极高的地区有所增加，产沙潜力低、中、高的地区减少。产沙潜力极低的区域保持不变。当将侵蚀潜力的变化与土地利用/覆盖变化进行比较时，很明显，土壤侵蚀潜力主要随着农业耕作面积的增加而增加。牧场转变为农业用地是土地利用的重大变化，导致更多的农业实践和相关的土壤流失。此外，结果表明研究区域的沙化程度有所增加，这也是土壤侵蚀加剧的明显证据。
Wind erosion is a complex process influenced by different factors. Most of these factors are stable over time, but land use/cover and land management practices are changing gradually. Therefore, this research investigates the impact of changing land use/cover and land management on wind erosion potential in southern Iran. We used remote sensing data (Landsat ETM+ and Landsat 8 imagery of 2004 and 2013) for land use/cover mapping and employed the Iran Research Institute of Forest and Rangeland (IRIFR) method to estimate changes in wind erosion potential. For an optimal mapping, the performance of different classification algorithms and input layers was tested. The amount of changes in wind erosion and land use/cover were quantified using cross-tabulation between the two years. To discriminate land use/cover related to wind erosion, the best results were obtained by combining the original spectral bands with synthetic bands and using Maximum Likelihood classification algorithm (Kappa Coefficient of 0.8 and 0.9 for Landsat ETM+ and Landsat 8, respectively). The IRIFR modelling results indicate that the wind erosion potential has increased over the last decade. The areas with a very high sediment yield potential have increased, whereas the areas with a low, medium, and high sediment yield potential decreased. The area with a very low sediment yield potential have remained constant. When comparing the change in erosion potential with land use/cover change, it is evident that soil erosion potential has increased mostly in accordance with the increase of the area of agricultural practices. The conversion of rangeland to agricultural land was a major land-use change which lead to more agricultural practices and associated soil loss. Moreover, results indicate an increase in sandification in the study area which is also a clear evidence of increasing in soil erosion.