基于Albedo-NDVI特征空间的康保县荒漠化时空动态监测
投稿时间:2023-08-20  修订日期:2023-11-29  点此下载全文
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李状 中国地质调查局天津地质调查中心(华北地质科技创新中心) 300170
刘宏伟 中国地质调查局天津地质调查中心(华北地质科技创新中心) 
白耀楠* 中国地质调查局天津地质调查中心(华北地质科技创新中心) 
韩博 中国地质调查局天津地质调查中心(华北地质科技创新中心) 
苗晋杰 中国地质调查局天津地质调查中心(华北地质科技创新中心) 
杜东 中国地质调查局天津地质调查中心(华北地质科技创新中心) 
徐丹虹 中国地质调查局天津地质调查中心(华北地质科技创新中心) 
中文摘要:荒漠化是威胁人类生存和发展的重要生态环境问题之一。我国荒漠化土地面积占比相对较高,因此持续开展荒漠化监测、治理和防治始终是我国生态保护修复工作中的一项重要任务。本文通过构建康保县1990~2022年Albedo-NDVI特征空间得到各期荒漠化指数,进而对研究区近32年来的荒漠化空间分布特征和演化规律进行时空动态监测研究;此外,本研究还通过收集分析相关数据变化趋势进一步探究自然和人为条件等驱动因素对荒漠化演化的影响机制。结论如下:(1)各期Albedo-NDVI特征空间“干边”的Albedo-NDVI线性回归方程,R2均大于0.7,表明Albedo与NDVI呈现出较强的相关性。(2)1990~2022年,研究区极重度和重度的荒漠化面积占比逐年降低,荒漠化状况得到了有效改善。(3)1990~2022年,研究区荒漠化减轻的面积逐渐增加,荒漠化加重的面积逐渐降低。(4)研究区自然因素(气温、相对湿度、干旱指数和风速等)、人为因素(土地利用和人口变化)以及生态治理(三北防护林和京津风沙源治理等工程、退耕还林、地下水超采综合治理)相关国家管理政策等都是荒漠化发展变化的重要驱动因素。
中文关键词:荒漠化差值指数  荒漠化  演化规律  驱动因素  康保县
 
Spatiotemporal dynamic monitoring of desertification in Kangbao County based on Albedo-NDVI feature space
Abstract:Desertification is one of the important ecological and environmental problems that threaten human existence and development. China's desertification land area accounts for a relatively high proportion, so the continuous monitoring, control and prevention of desertification has always been an important task in China's ecological protection and restoration work. By constructing the Albedo-NDVI characteristic space of Kangbao County from 1990 to 2022, the desertification index of each period was obtained, and then the spatial distribution characteristics and evolution law of desertification in the study area in recent 32 years were dynamically monitored and studied. In addition, this study further explored the influence mechanism of natural and man-made driving factors on the evolution of desertification by collecting and analyzing the change trend of relevant data. The conclusions are as follows: (1) construct the Albedo-NDVI linear regression equation of the "dry edge" of Albedo-NDVI feature space, R2 is greater than 0.7, indicating that the Albedo and the NDVI show a strong correlation. (2) From 1990 to 2022, the proportion of extremely severe and severe desertification in the study areas decreased year by year, and the desertification situation was effectively improved. (3) From 1990 to 2022, the area of desertification reduction in the study area gradually increased, and the area of desertification aggravation gradually decreased. (4) Natural factors (temperature, sunshine number, evaporation amount and wind speed, etc), human factors (land use and population change), and policies related to ecological management (3-North Shelter Forest Program, the Beijing-Tianjin sandstorm source control project, the Taihang Mountain afforestation project, the conversion of farmland to forest, and the comprehensive treatment of groundwater over-extraction) in the study area are all important driving factors for the development and change of desertification.
keywords:desertification difference index  desertification  evolution law  driving factors  Kangbao County
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