Spatial analysis of forest cover and quality dynamics of Jalthal forest in the Jhapa district, Nepal

IF 1.8 3区农林科学 Q2 FORESTRY

Scandinavian Journal of Forest Research Pub Date : 2023-04-03 DOI:10.1080/02827581.2023.2210846

Arati Budhathoki, Ambika Prasad Gautam, Ram Asheshwar Mandal

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引用次数: 1

Abstract

ABSTRACT Efforts of community forest users show positive changes in forest cover and quality but there was limited study regarding this. Thus, this study was objectively conducted to assess dynamics of forest cover and quality between 1990 and 2021 in Jalthal Jhapa, Nepal. Supervised classification with a maximum likelihood algorithm was applied to classify forest cover to produce maps of 1990, 2005 and 2021. Forest quality change was assessed using Normalized Difference Vegetation Index (NDVI) and Soil Moisture Index (SVI). A total of 114.0 ha non-forest was converted into forest between 2005 and 2011. Overall accuracy of classified maps of 1990, 2005 and 2021 was 85.29%, 84.08% and 88.13%, respectively. Sparse forest was converted into dense forest by 0.06% between 1990 and 2021. Principal Component Analysis showed successful implementation of community forest program and control grazing were main factors positively affecting to increase forest cover and quality. Value of NDVI showed that high vegetation forest covers around 42.27% in 2021 and SMI was the highest. Kaiser-Meyer-Olk in (KMO) (0.474) and Bartlett Sphericity tests (p = 0.001) showed there was linear relationship between factors affecting forest cover and quality. This paper will be useful for academicians and policymakers to monitor forest.

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尼泊尔贾帕县Jalthal森林覆盖率和质量动态的空间分析

社区森林使用者的努力显示出森林覆盖率和质量的积极变化，但对此的研究有限。因此，本研究客观地评估了1990年至2021年间尼泊尔贾塔尔贾帕的森林覆盖率和质量动态。采用最大似然算法进行监督分类，对森林覆盖进行分类，生成1990年、2005年和2021年的地图。采用归一化植被指数（NDVI）和土壤水分指数（SVI）评价森林质量变化。2005年至2011年间，共有114.0公顷的非森林变为森林。1990年、2005年和2021年分类地图的总体准确率分别为85.29%、84.08%和88.13%。1990年至2021年间，稀疏森林转变为茂密森林的比例为0.06%。主成分分析表明，社区森林计划的成功实施和控制放牧是积极影响森林覆盖率和质量提高的主要因素。NDVI值显示，2021年高植被森林覆盖率约为42.27%，SMI最高。Kaiser-Meyer-Olk-in（KMO）（0.474）和Bartlett球度检验（p=0.001）表明，影响森林覆盖率和质量的因素之间存在线性关系。这篇论文将有助于学者和决策者监测森林。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Scandinavian Journal of Forest Research 农林科学-林学

CiteScore

3.00

自引率

5.60%

发文量

审稿时长

3.3 months

期刊介绍： The Scandinavian Journal of Forest Research is a leading international research journal with a focus on forests and forestry in boreal and temperate regions worldwide.