30-year changes of natural forests under human activities in the Indochina peninsula - case studies in Cambodia, Laos and Vietnam

IF 2.4 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Duong Nguyen Dinh, Cam Lai Vinh
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引用次数: 1

Abstract

Natural forests are a basic component of the earth's ecology. It is essential for biodiversity, hydrological cycle regulation, and environmental protection. Natural forests are gradually degraded and reduced due to timber logging, conversion to cropland, production forests, commodity trees, and infrastructure development. Decreasing natural forests results in loss of valuable habitats, land degradation, soil erosion, and imbalance of water cycle on the regional scale. Thus, operational monitoring of natural forest cover change has been in the interest of scientists for a long time. Current forest mapping methods using remotely sensed data provide limited capability to separate natural forests and planted forests. Natural forest statistics are often generated using official forestry national reports that have different bias levels due to different methodologies applied in different countries in forest inventory. Over the last couple of decades, natural forests have been over-exploited for various reasons. This led to forest cover degradation and water regulation capability, which results in extreme floods and drought of a watershed in general. This situation demands an urgent need to develop a fast, reliable, and automated method for mapping natural forests. In this study, by applying a new method for mapping natural forests by Landsat time series, the authors succeeded in mapping changes of natural forests of Cambodia, Laos, and Vietnam from 1989 to 2018. As a focused study area, three provinces: Ratanakiri of Cambodia, Attapeu of Laos, and Kon Tum of Vietnam were selected. The study reveals that after 30 years, 51.3% of natural forests in Ratanakiri, 27.8% of natural forests in Attapeu, and 50% of natural forests in Kon Tum were lost. Classification results were validated using high spatial resolution imagery of Google Earth. The overall accuracy of 99.3% for the year 2018 was achieved.
中南半岛人类活动下的30年天然林变化——以柬埔寨、老挝和越南为例
天然林是地球生态的基本组成部分。它对生物多样性、水循环调节和环境保护至关重要。天然林由于木材采伐、转为耕地、生产林、商品树和基础设施发展而逐渐退化和减少。天然林的减少导致宝贵栖息地的丧失、土地退化、土壤侵蚀和区域尺度上水循环的不平衡。因此,长期以来,对自然森林覆盖变化的操作监测一直是科学家们感兴趣的问题。目前使用遥感数据的森林制图方法在区分天然林和人工林方面能力有限。天然林统计数据通常是利用官方林业国家报告编制的,由于不同国家在森林清查中采用不同的方法,这些报告的偏差程度不同。在过去的几十年里,由于各种原因,天然林被过度开发。这导致森林覆盖退化和水调节能力下降,从而导致流域一般出现极端洪涝和干旱。这种情况迫切需要开发一种快速、可靠、自动化的天然林测绘方法。本研究采用一种新的Landsat时间序列天然林制图方法,成功绘制了1989 - 2018年柬埔寨、老挝和越南的天然林变化图。选取柬埔寨腊塔纳基里省、老挝阿达坡省和越南昆土省作为重点研究区域。研究表明,30年后,Ratanakiri天然林的51.3%、Attapeu天然林的27.8%和Kon Tum天然林的50%消失了。利用谷歌地球高空间分辨率影像对分类结果进行验证。2018年总体准确率达到99.3%。
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来源期刊
VIETNAM JOURNAL OF EARTH SCIENCES
VIETNAM JOURNAL OF EARTH SCIENCES GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.60
自引率
20.00%
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