肯尼亚山森林保护区和国家公园植被状况指数(VCI)时空变异性与火灾发生、烧毁面积的关系评价

IF 3 3区 农林科学 Q2 ECOLOGY
Kevin W. Nyongesa, Christoph Pucher, Claudio Poletti, H. Vacik
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引用次数: 0

摘要

气候变化、植被动态、人类活动和森林管理都会影响火灾的发生。研究了肯尼亚山森林保护区和国家公园(MKFRNP) 3种不同土地利用类型:国家公园(NP)、森林站(FS)和农田(FL)植被条件指数(VCI)的时空变异及其对火灾发生的影响。本研究利用MODIS卫星数据获得归一化植被指数(NDVI)、VCI、火灾次数和燃烧面积。本研究的具体目的是:(1)研究2003 - 2018年MKFRNP不同区域(NP、FS和FL) VCI、火灾发生和烧毁面积的时空变化;(2)探索MKFRNP不同区域(NP、FS和FL) VCI、火灾发生和烧毁面积的关系。研究结果表明,尽管MKFRNP全年都发生火灾,但大多数火灾发生在旱季。不同土地利用类型的火灾发生与VCI分布的时空关系不同。在FL,由于传统上使用火作为土地管理工具,因此无论VCI如何,每月起火的概率和火灾数量都大致相同。而当VCI低于50%时(干旱),特别是在干旱季节,气象条件和气候的影响远大于人类活动的影响,NP和FS的火灾发生概率和月火灾数量较高。除了社区、KFS和KWS在消防和监测系统方面已经做出的努力外,卫星数据可以帮助获取准确和及时的VCI信息和火灾可能发生的时空信息,以便在最容易发生火灾的时期做好准备,并改善MKFRNP的火灾管理、资源规划和灭火活动。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evaluation of the Relationship between Spatio-Temporal Variability of Vegetation Condition Index (VCI), Fire Occurrence and Burnt Area in Mount Kenya Forest Reserve and National Park
Climate change, vegetation dynamics, human activities and forest management influence the occurrence of fires. This study investigated the spatio-temporal variability of the Vegetation Condition Index (VCI) and its influence on fire occurrence in three different land use types in Mount Kenya Forest Reserve and National Park (MKFRNP): National Park (NP), Forest Stations (FS) and Farmlands (FL). The study used MODIS satellite data to obtain the Normalized Difference Vegetation Index (NDVI), the VCI, the number of fires and the burnt area. The specific objectives of this research were (i) to examine the spatio-temporal variability of VCI, fire occurrence and burnt area in MKFRNP from 2003 to 2018 and (ii) to explore the relationship between VCI, fire occurrence and burnt area in different areas of the MKFRNP (NP, FS and FL). The findings show that even though fires occur throughout the year in MKFRNP, most of the fires occur during dry seasons. The relationship between spatio-temporal fire occurrence and VCI distribution is different for each land use type. In the FL, the probability of fire ignition and the number of fires per month was more or less the same irrespective of the VCI because of the traditional use of fire as a land management tool. However, the probability of fire ignition and the number of fires per month is high in the NP and FS when the VCI is below 50% (drought), especially in the dry seasons, when and where the impact of meteorological conditions and climate have much more impact than human activities. In addition to the efforts already made by communities, KFS and KWS in the fire fighting and monitoring system, satellite data can be useful to acquire accurate and timely information on the VCI and the likely spatio-temporal occurrence of fires in order to be prepared in the most fire-prone periods and improve fire management, the planning of resources and fire suppression activities in MKFRNP.
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来源期刊
Fire-Switzerland
Fire-Switzerland Multiple-
CiteScore
3.10
自引率
15.60%
发文量
182
审稿时长
11 weeks
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