ヤナガワ　アキ   AKI YANAGAWA   柳川　亜季    所属   理工学部 総合理工学科    データサイエンス学環    職種   准教授
言語種別	英語
発行・発表の年月	2025/09
形態種別	学術雑誌
査読	査読あり
標題	Desertification Assessment Based on Ecosystem Resistance Estimated from NDVI and SPEI during 2000–2019
執筆形態	共著
掲載誌名	Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)
掲載区分	国内
出版社・発行元	Japan Society of Civil Engineers
巻・号・頁	Impress
総ページ数	9
担当区分	筆頭著者,責任著者
著者・共著者	Aki YANAGAWA, Haruyuki FUJIMAKI, Ryo SASAKI
概要	esertification has predominantly been studied from meteorological and geographical perspectives as these disciplines significantly influence ecosystem functions in affected regions, resulting in alterations to vegetation cover and plant growth. However, desertification indicators that incorporate the perspective of ecosystem function assessment have not yet been proposed. Here, we assessed temporal changes in desertification using an ecosystem function index derived from the Moderate Resolution Imaging Spectroradiometer (MODIS)-based Normalized Difference Vegetation Index (NDVI). Specifically, we evaluated desertification in terms of ecosystem resistance during drought periods, inferred using the Standardized Precipitation Evapotranspiration Index (SPEI). Our findings indicate that the ecosystem function index declined across various land cover types worldwide. The decline in resistance may be primarily owing to globally enhanced NDVI. Furthermore, on a global scale, a pronounced shift in resistance was observed around the year 2012.