OALib Journal期刊
ISSN: 2333-9721
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贵州土地石漠化类型时空演变过程及其评价
DOI: 10.11821/xb200905010, PP. 609-618
Keywords: 石漠化,时空演变,贵
Abstract:
构建了贵州20世纪80年代、90年代和21世纪初等3期历史石漠化数据,利用其空间变换和数学模型详细探讨和评价了石漠化的时空演变过程,研究发现(1)研究时段内贵州省石漠化总面积变化不明显,但石漠化内部类型之间的相互演变非常显著,各类型之间的演变具有转移、多变、“此消彼长”的特点。(2)石漠化的时空演变过程可分为单变方式、层变方式、返变方式等3种基本类型,其中以层变方式为主,单变方式为辅,返变方式较少。(3)石漠化正向演变与逆向演变并存,治理速度赶不上恶化速度,两者的比值为82.29%,局部治理,整体恶化。(4)各石漠化类型总的演变速率是398.31km2·a-1,石漠化等级越高,演变速率越慢。(5)石漠化演变频率最快的是中度石漠化和潜在石漠化,轻度石漠化的演变频率明显低于中度石漠化。对石漠化的空间演变区域特征和影响因子做了宏观的定性分析、并根据石漠化演变特点对综合治理提出了相应的建议。
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