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Remote sensing and evaluation of the wetland ecological degradation process of the Zoige Plateau Wetland in China

机译：中国Zoige Plateau湿地湿地生态降解过程的遥感与评价

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摘要

The Zoige Plateau Wetland is the largest high-altitude swamp wetland in China. It plays a key role in ecological balance and the global change. Climate change and improper utilization have consequently resulted in decreased wetland area, disrupted ecosystem structure, and wetland function degradation and function loss. The Zoige Plateau Wetland thus faces severe ecological degradation problems. In this study, selecting the Zoige Plateau Wetland as the study area, remote sensing was used to track the ecological degradation process during 2000-2015 from three aspects (area degradation, structure degradation and function degradation) and at three administrative levels (study area, county and key township). To assess the wetland degradation quantitatively, an analytic hierarchy process (AHP) was used to construct a composite wetland degradation index based on five indicators: wetland area change rate, landscape fractal dimension, landscape fragmentation, vegetation biomass and vegetation coverage. The results showed the following. (1) In terms of area change rate, the total wetland area had continuously decreased during 2000-2015 compared to that in the 1990s, and 2010 was the most significant. The frequency of negative change in the wetland area reached 87.5% in all four counties and across four time periods (2000, 2005, 2010 and 2015), and 85% at the township level. At the spatial scale, Hongyuan County had the smallest wetland area change rate. (2) In terms of structure change, the variations in landscape fractal dimension and landscape fragmentation generally exhibited similar trends at different levels. Specifically, the ecosystem structure was seriously affected in 2000, then gradually recovered in 2005 and 2010, and was again under aggravated interference in 2015. (3) In terms of function change, the above-ground biomass yield in the northeastern region was higher than that in the southern region. A low value was detected in 2000, and then the value increased and remained essentially the same in 2005 and 2010. However, the value decreased in 2015, indicating deteriorated vegetation condition. The vegetation coverage in the study area remained steady, without deterioration in a particular year. (4) In terms of the whole study area, the wetland degradation grades in the four periods were mild (2000), moderate (2005), mild (2010) and mild (2015). In brief, the wetland degradation was the most severe in 2005. Over the 2000-2015 period, the spatial degradation pattern of the Zoige Plateau Wetland progressed from the northeast to the southwest. The model built in this study could be widely applicable. And this study has also some reference value for monitoring and management of wetland degradation by remote sensing.
机译：Zoige Plateau湿地是中国最大的高空沼泽湿地。它在生态平衡和全球变革中起着关键作用。因此，气候变化和不当的利用率导致湿地面积减少，破坏生态系统结构和湿地功能降解和功能损失。 Zoige Plateau湿地面临着严重的生态降解问题。在这项研究中，选择Zoige Plateau湿地作为研究区域，遥感在2000-2015期间追踪生态降解过程从三个方面（区域降解，结构降解和功能降解）和三个行政水平（研究区域，县和主要乡镇）。为了评估湿地降解定量降解，使用分析层次（AHP）基于五个指标构建复合湿地降解指数：湿地区域变化率，景观分形维数，景观碎片，植被生物量和植被覆盖。结果表明以下。 （1）在面积变化率方面，与20世纪90年代相比，2000 - 2015年湿地面积持续下降，2010年是最重要的。湿地地区的负变化频率在所有四个县中达到87.5％，四个时间段（2000年，2005年，2010年和2015年），乡镇一级85％。在空间规模，宏源县有最小的湿地地区变化率。 （2）就结构变化而言，景观分形维数和景观片段的变化通常表现出不同水平的类似趋势。具体而言，2000年生态系统结构受到严重影响，然后在2005年和2010年逐渐恢复，并在2015年再次受加剧干扰。（3）在职能变化方面，东北地区的上述生物量产量高于在南部地区。在2000年检测到低值，然后在2005年和2010年增加并留下了基本相同。然而，2015年的价值下降，植被状况恶化。研究区域的植被覆盖率保持稳定，特定年份没有恶化。 （4）就整个研究领域而言，四个时期的湿地降解等级为Mild（2000），中度（2005），轻度（2010）和轻度（2015）。简而言之，湿地降解于2005年是最严重的。在2000 - 2015年期间，Zoige高原湿地的空间退化模式从东北进入西南。本研究中建立的模型可广泛适用。该研究还通过遥感来监测和管理湿地降解的一些参考价值。

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  • 来源
    《Ecological indicators》 |2019年第9期|48-58|共11页
  • 作者

    Shen Ge; Yang Xiuchun; Jin Yunxiang; Xu Bin; Zhou Qingbo;

  • 作者单位

    Chinese Acad Agr Sci Inst Agr Resources & Reg Planning Minist Agr Key Lab Agr Remote Sensing Beijing 100081 Peoples R China;

    Chinese Acad Agr Sci Inst Agr Resources & Reg Planning Minist Agr Key Lab Agr Remote Sensing Beijing 100081 Peoples R China;

    Chinese Acad Agr Sci Inst Agr Resources & Reg Planning Minist Agr Key Lab Agr Remote Sensing Beijing 100081 Peoples R China;

    Chinese Acad Agr Sci Inst Agr Resources & Reg Planning Minist Agr Key Lab Agr Remote Sensing Beijing 100081 Peoples R China;

    Chinese Acad Agr Sci Inst Agr Resources & Reg Planning Minist Agr Key Lab Agr Remote Sensing Beijing 100081 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Wetland degradation; Degradation process; Composite degradation index; Remote sensing; Zoige Plateau Wetland;

    机译：湿地降解;降解过程;复合降解指数;遥感;Zoige Plateau湿地;

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