Department of Geographic Information Science, Nanjing University, Nanjing, Jiangsu Province 210046, PR China; Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, Nanjing University, Nanjing, Jiangsu Province 210046, PR China.
Department of Geographic Information Science, Nanjing University, Nanjing, Jiangsu Province 210046, PR China; Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, Nanjing University, Nanjing, Jiangsu Province 210046, PR China; Collaborative Innovation Center for the South Sea Studies, Nanjing University, Nanjing, Jiangsu Province 210023, PR China.
Sci Total Environ. 2015 Feb 15;506-507:259-71. doi: 10.1016/j.scitotenv.2014.11.004. Epub 2014 Nov 20.
Large-scale changes in land use and land cover over long timescales can induce significant variations in soil physicochemical properties, particularly in the riparian zones of arid regions. Frequent reclamation of wetlands and grasslands and intensive agricultural activity have induced significant changes in both land use/cover and soil physicochemical properties in the riparian zones of the middle Heihe River basin of China. The present study aims to explore whether land use/land cover change (LUCC) can well explain the variations in soil properties in the riparian zones of the middle Heihe River basin. To achieve this, we mapped LUCC and quantified the type of land use change using remote sensing images, topographic maps, and GIS analysis techniques. Forty-two sites were selected for soil and vegetation sampling. Then, physical and chemical experiments were employed to determine soil moisture, soil bulk density, soil pH, soil organic carbon, total nitrogen, total potassium, total phosphorous, available nitrogen, available potassium, and available phosphorous. The Independent-Samples Kruskal-Wallis Test, principal component analysis, and a scatter matrix were used to analyze the effects of LUCC on soil properties. The results indicate that the majority of the parameters investigated were affected significantly by LUCC. In particular, soil moisture and soil organic carbon can be explained well by land cover change and land use change, respectively. Furthermore, changes in soil moisture could be attributed primarily to land cover changes. Changes in soil organic carbon were correlated closely with the following land use change types: wetlands-arable, forest-grasslands, and grasslands-desert. Other parameters, including pH and total K, were also found to exhibit significant correlations with LUCC. However, changes in soil nutrients were shown to be induced most probably by human agricultural activity (i.e. fertilize, irrigation, tillage, etc.), rather than by simple conversions from one land use/cover types to the others.
大规模的土地利用和土地覆盖变化会导致土壤物理化学性质发生显著变化，特别是在干旱地区的河岸带。频繁开垦湿地和草地以及集约化农业活动导致中国黑河中上游流域河岸带的土地利用/土地覆盖和土壤物理化学性质发生了显著变化。本研究旨在探讨土地利用/土地覆盖变化（LUCC）是否能很好地解释黑河中上游流域河岸带土壤性质的变化。为此，我们利用遥感影像、地形图和 GIS 分析技术，绘制了 LUCC 图，并量化了土地利用变化的类型。选择了 42 个地点进行土壤和植被采样。然后，通过物理和化学实验来确定土壤水分、土壤容重、土壤 pH 值、土壤有机碳、全氮、全钾、总磷、有效氮、有效钾和有效磷。采用独立样本 Kruskal-Wallis 检验、主成分分析和散点矩阵分析 LUCC 对土壤性质的影响。结果表明，所研究的大多数参数都受到 LUCC 的显著影响。特别是，土壤水分和土壤有机碳可以分别很好地用地貌变化和土地利用变化来解释。此外，土壤水分的变化主要归因于土地覆盖变化。土壤有机碳的变化与湿地-耕地、森林-草地和草地-沙漠等土地利用变化类型密切相关。其他参数，包括 pH 值和全钾，也与 LUCC 呈显著相关。然而，土壤养分的变化很可能是由人类农业活动（如施肥、灌溉、耕作等）引起的，而不是简单地从一种土地利用/土地覆盖类型转换为另一种类型。
