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

机译：中国若尔盖高原湿地湿地生态退化过程的遥感与评价。

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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：若尔盖高原湿地是中国最大的高海拔沼泽湿地。它在生态平衡和全球变化中起着关键作用。因此，气候变化和利用不当导致了湿地面积减少，生态系统结构破坏以及湿地功能退化和功能丧失。佐伊格高原湿地因此面临严重的生态退化问题。在这项研究中，选择Zoige高原湿地作为研究区域，利用遥感技术从三个方面（区域退化，结构退化和功能退化）和三个行政级别（研究区域，县和重点乡镇）。为了定量评估湿地退化，使用层次分析法（AHP）基于五个指标构建复合湿地退化指数：湿地面积变化率，景观分形维数，景观破碎化，植被生物量和植被覆盖率。结果显示如下。 （1）从面积变化率来看，与1990年代相比，2000-2015年湿地总面积持续减少，而2010年是最重要的。在所有四个县和四个时期（2000年，2005年，2010年和2015年），湿地面积负变化的频率达到87.5％，而在乡镇水平达到85％。在空间尺度上，洪源县湿地面积变化率最小。 （2）就结构变化而言，景观分形维数和景观破碎化程度的变化一般表现出不同水平的相似趋势。具体来说，生态系统结构在2000年受到严重影响，然后在2005年和2010年逐渐恢复，并在2015年再次受到严重干扰。（3）就功能变化而言，东北地区的地上生物量产量高于在南部地区。在2000年检测到一个较低的值，然后该值增加并在2005年和2010年基本保持不变。但是，在2015年该值下降，表明植被状况恶化。研究区域的植被覆盖率保持稳定，在特定年份没有恶化。 （4）就整个研究区域而言，四个时期的湿地退化等级分别为温和（2000），温和（2005），温和（2010）和温和（2015）。简而言之，2005年湿地退化最严重。在2000-2015年期间，若尔盖高原湿地的空间退化格局从东北向西南发展。在这项研究中建立的模型可能是广泛适用的。这项研究对遥感监测和管理湿地退化具有一定的参考价值。

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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：湿地退化;退化过程;综合退化指数;遥感;若尔盖高原湿地;

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