变化检测、森林冠层密度和森林破碎化的估算与分析——以印度孙德尔本斯为例

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2022-03-30 DOI:10.1080/10549811.2022.2059515

K. Kundu, P. Halder, J. K. Mandal

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引用次数: 0

摘要

本文根据印度孙德尔本斯森林密度的变化，利用模糊c均值算法将卫星影像分为4类。分类为茂密森林、疏林、水体和湿地。研究表明，净森林面积从1975年的932平方公里减少到2018年的847平方公里，减少了3.75%，森林砍伐率为每年1.96平方公里。相关统计结果表明，森林被砍伐地区向湿地和水体转化。森林冠层密度(FCD)模型结果显示，森林冠层密度为60-100%的区域从1975年的42% (939 km2)逐渐下降到2018年的36% (814 km2)。1990年和1975年的冠层密度最大值分别为80 ~ 80%和60 ~ 80%。森林破碎化模型的结果表明，森林斑块和边缘面积分别增加了253%和28%，而孔洞林面积缓慢减少，减少了11%。森林破碎化主要发生在斑块林、边缘林、孔洞林和核心林，面积约为40km2。因此，本研究对监测印度孙德尔本斯红树林土地覆盖变化具有一定的指导意义。

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Estimation and Analysis of Change Detection, Forest Canopy Density, and Forest Fragmentation: A Case Study of the Indian Sundarbans

ABSTRACT In this paper, satellite imagery is classified into four categories using the fuzzy c-means algorithm of the Indian Sundarbans due to its forest density changes. The categories are dense forest, sparse forest, water bodies, and wetlands. The study reveals that net forest areas declined by 3.75% from 932 km2 in 1975 to 847 km2 in 2018 and the rate of deforestation was 1.96 km2 year−1. The correlation statistic shows that the deforested areas were converted to wetland and water bodies. The results of the forest canopy density (FCD) model show that areas, with canopy density of 60–100% gradually declined from 42% (939 km2) in 1975 to 36% (814 km2) in 2018. Moreover, we also observed that maximum canopy density was >80% in 1990 and 60–80% in 1975. The results of the forest fragmentation model show that forest patch and edge areas progressively increased by 253% and 28%, respectively, while perforated forest areas slowly decreased with 11%. We find that most forest fragmentation happened in patch, edge, perforated, and core forest with an area >4 km2. Therefore, this study may be helpful in monitoring land cover changes of the Indian Sundarbans for sustainable mangrove forests.

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.