基于GEE的粤北典型石漠化地区耕地NPP年际时空演变研究  

Spatiotemporal Variability of Cropland Net Primary Production in Typical Karst Rocky Desertification Areas of Northern Guangdong Based on GEE

作　　者：唐梁博 张宇鹏 孔德庸 张妤琳 王卫[1,2] TANG Liang-bo;ZHANG Yu-peng;KONG De-yong;ZHANG Yu-lin;WANG Wei(Shaoguan University,Shaoguan 512005,China;Guangzhou South China Natural Resources Science and Technology Research Institute,Guangzhou 510610,China)

机构地区：[1]韶关学院,韶关512005 [2]广州市华南自然资源科学技术研究院,广州510610

出　　处：《价值工程》2024年第14期152-155,共4页Value Engineering

基　　金：韶关市科技计划项目(编号:220531134531827);韶关学院科研项目(编号:432-990066012301)。

摘　　要：耕地是保障粮食安全和国民经济高质量发展的宝贵资源。喀斯特地区的耕地变化监测对促进耕地资源可持续利用,评估石漠化治理成效与区域生态安全具有重要意义。研究基于Google Earth Engine,调用土地覆被、NPP数据集与地形高程数据,分析2018-2022年耕地面积、NPP的时空演变。研究表明:①2018~2022年粤北典型石漠化地区耕地面积总体略有缩减,集中于研究区南北两侧及缓坡与中坡地带;②总体NPP在镇域尺度与所有坡型均呈现递增趋势,表明生态环境的整体改善;③耕地NPP在不同坡型均体现为递增趋势,但在镇域尺度呈现出现南北两侧递减与中南部递增的差异化趋势。表明在退耕还林、封山育林等石漠化综合治理措施取得成效,且尽管耕地面积有所缩减仍保证了现有耕地的生产能力,部分地区呈现出的递减趋势可能是治理过程中产生的暂时性下降。表明韶关典型石漠化地区综合治理取得成效,有效改善了区域生态和耕作条件。Cropland is a precious resource to ensure food security and the high-quality development of the national economy.The monitoring of cultivated land change in karst area is of great significance to promoting the sustainable utilization of cultivated land resources and evaluating the effect of r karst rocky desertification control and regional ecological security.Based on Google Earth Engine,land cover,NPP data set and topographic elevation data were used to analyze the spatial and temporal evolution of cropland area and NPP from 2018 to 2022.The study shows that:①from 2018 to 2022,the cropland area in the typical rocky desertification areas in northern Guangdong was slightly reduced,focusing on the north and south sides of the research area and the gentle slope and mesoslope zones;②the overall NPP showed an increasing trend in the town scale and all slope types,indicating the overall improvement of ecological environment;③NPP of cropland is reflected as an increasing trend in different slope types,but it shows the differentiation trend of decreasing on the north and south sides and the increasing central and south at the town scale.It shows that the comprehensive measures to control karst rocky desertification such as returning farmland to forests and closing mountains for forest cultivation have achieved results,and although the reduction of the cropland area has guaranteed the production capacity of the existing cropland,the decreasing trend in some areas may be the temporary decline in the process of governance.It shows that the comprehensive control of typical karst rocky desertification areas in Shaoguan has achieved results and effectively improved the regional ecology and farming conditions.

关 键 词：石漠化 耕地植被净初级生产力 时空演变 Google Earth Engine 

分 类 号：F301.24[经济管理—产业经济]