基于植被指数开展汉江流域生态恢复力评估研究

张志苗; 刘孝富; 邱文婷; 罗镭; 刘柏音; 王莹

doi:10.12153/j.issn.1674-991X.20210686

基于植被指数开展汉江流域生态恢复力评估研究

doi: 10.12153/j.issn.1674-991X.20210686

中国环境科学研究院环境信息研究所

基金项目: 长江生态环境保护修复联合研究项目（第一期）（2019-LHYJ-01）

详细信息

作者简介:
张志苗(1988—)，女，硕士，主要研究方向为环境数据挖掘，zhangzm@craes.org.cn

通讯作者:
刘孝富(1983—)，男，副研究员，博士，主要研究方向为环境数据挖掘、生态环境规划，liuxf@craes.org.cn

中图分类号: X522
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- 被引次数: 0
出版历程
- 收稿日期: 2021-11-15
- 网络出版日期: 2022-04-02

Evaluation of ecological resilience of Hanjiang River Basin based on vegetation index

Institute of Environmental Information Sciences, Chinese Research Academy of Environmental Sciences

摘要

摘要: 基于2001—2020年各年度增强型植被指数（enhanced vegetation index, EVI）数据，分析汉江流域植被覆盖变化情况，并计算汉江流域15万个1 km×1 km基本单元的2001—2010年、2001—2011年、2001—2012年直至2001—2020年的EVI变化斜率，采用指数衰减方法拟合EVI变化斜率维持正、负趋势的时间，分析汉江全流域以及564个子流域的系统恢复力，评估生态系统稳定性以及可持续发展程度。结果表明：2001—2020年，汉江流域EVI增长了12.3%，流域植被覆盖情况在逐渐变好；汉江流域整体生态恢复力较好，拟合得出维持正趋势的基本单元与维持负趋势的基本单元衰减时间差为65.3年；汉江流域生态恢复力总体上呈现上游高、中下游低的分布特征。
- 汉江流域 /
- 生态恢复力 /
- 指数衰减 /
- 植被覆盖
Abstract: Based on the Enhanced Vegetation Index (EVI) data of each year from 2001 to 2020, the change of vegetation cover in the Hanjiang River Basin was analyzed, and the slope of EVI change of 150000 1 km×1 km basic units was calculated in 2001-2010, 2001-2011, 2001-2012 and 2001-2020 in the Han River Basin. The exponential decay method was used to fit the time when the change slope of EVI maintained a positive and negative trend, and the ecological resilience of the whole Hanjiang River Basin and 564 sub-basins was analyzed to evaluate the stability and sustainable development level of the ecosystem. The results showed that the EVI value of Hanjiang River Basin increased by 12.3% from 2001 to 2020, and the vegetation coverage of Hanjiang River Basin was getting better year by year. The overall ecological resilience of Hanjiang River Basin was good, and the decay time difference between the grid with a positive trend and the grid with a negative trend was 65.3 years. The ecological resilience of Hanjiang River Basin generally presented the distribution characteristics of high in the upper reaches and low in the middle and lower reaches.
- Hanjiang River Basin /
- ecological resilience /
- exponential decay /
- vegetation coverage

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图 1 汉江子流域划分

Figure 1. Sub-watershed map of the Hanjiang River

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图 2 2001—2020年汉江流域平均EVI变化

Figure 2. Mean EVI change of Hanjiang River Basin from 2001 to 2020

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图 3 2001—2020年汉江流域EVI空间分布

Figure 3. Spatial distribution of EVI in Hanjiang River Basin from 2001 to 2020

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图 4 各年度EVI维持正、负趋势的栅格空间分布

Figure 4. Spatial distribution of EVI maintained grid with positive and negative trends in each year

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图 5 栅格维持趋势的时间比

Figure 5. Ratio of time for grid to maintain trend

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图 6 汉江流域正负趋势衰减拟合图

Figure 6. Fitting diagram of positive and negative trend attenuation in Hanjiang River basin

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图 7 汉江子流域生态恢复力空间分布

Figure 7. Spatial distribution of ecological resilience of sub-watershed in the Hanjiang River

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图 8 汉江子流域生态恢复力分级

Figure 8. Hierarchical map of ecological resilience in sub-watershed of the Hanjiang River

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表 1 汉江流域EVI维持性栅格数量统计

Table 1. Quantity statistics of EVI maintained grid in Hanjiang River Basin

年份	维持正趋势		维持负趋势
年份	栅格数量	占比/%	栅格数量	占比/%
2010	136958	100	12288	100
2011	132387	96.66	9476	77.12
2012	129843	94.80	7632	62.11
2013	128058	93.50	6420	52.25
2014	125092	91.34	5867	47.75
2015	123332	90.05	5573	45.35
2016	122195	89.22	5097	41.48
2017	121379	88.62	4783	38.92
2018	120649	88.09	4512	36.72
2019	119809	87.48	4355	35.44
2020	118690	86.66	4259	34.66

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表 2 汉江子流域生态恢复力等级统计

Table 2. Grade statistics of ecological resilience of sub-watershed of the Hanjiang River

生态恢复力排名	生态恢复力等级	面积/km²
1~150	极好	36 221.52
151~300	较好	49 204.85
301~467	一般	46 081.00
468~510	较差	9 322.57
511~564	极差	9 513.04
合计		150342.97

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