泾河上游固原县景观变化地形梯度特征分析
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国家基础研究重大(973)规划项目“农林复合景观的生态耦合关系及水土资源优化配置”(2002CB111506)


Terrain Gradient Characteristic Analysis of Landscape Change in Guyuan County in the Upper Reaches of Jinghe River
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    摘要:

    以泾河上游固原县为研究区,采用1986年和2000年景观格局数据,利用地形位梯度指数和景观类型转移概率矩阵,对该县20世纪末景观格局的地形梯度特征及其变化规律进行了定量分析和探讨。结果表明,研究期内景观类型在地形位梯度上整体分布格局保持高低二段式结构,草地和林地景观以高地形位为优势区域,其它景观类型主要占据低地形位。由于该期间景观类型相互转化,各种景观类型在不同地形位区间上分布指数呈现出规律性变化,主要表现在低地形位上建设用地优势程度上升而耕地相对下降,高地形位上草地优势程度增加而林地相对降低,反映了人类活动主要限于低地形位地段上,对景观改造和影响程度较低,且该区不合理的景观结构状况得到一定程度的改观。

    Abstract:

    Based on landscape pattern data in 1986 and 2000,terrain gradient characteristics of landscape pattern change in Guyuan County in the upper reaches of Jinghe River were quantitatively analyzed and discussed by using terrain niche index and transformation probability among the landscape types.Results showed that the whole landscape spatial pattern along terrain gradient was subject to little change during the late 20th century.Grassland and forest mainly occupied high terrain niches and other landscape types occupied low terrain niches.Meanwhile,there was regular variation in their distribution index values in different terrain niche zones because of the conversion and competition among the landscape types to a certain extent.The dominance degree of construction land on low terrain niches increased and the dominance degree of farmland decreased reversely,while the dominance degree of grassland on high terrain niches ascended and the dominance degree of forest descended correspondingly.Conclusively,human' s reconstruction on landscape patterns in Guyuan County focuses on low terrain niche areas so that the effects are not obvious and the unreasonable landscape structure being formed previously does not change significantly.

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董有福,汤国安,赵永华.泾河上游固原县景观变化地形梯度特征分析[J].水土保持通报,2010,(1):222-226

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  • 收稿日期:2009-06-04
  • 最后修改日期:2009-10-18
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  • 在线发布日期: 2014-11-26
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