Mapping soil organic matter content using Sentinel-2 syntheticimages at different time intervals in Northeast China  

作　　者：Chong Luo Wenqi Zhang Xinle Zhang Huanjun Liu 

机构地区：[1]State Key Laboratory of Black Soils Conservation and Utilization,Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences,Changchun,People’s Republic of China [2]School of economics and management,Jilin Agricultural University,Changchun,People’s Republic of China [3]College of Information Technology,Jilin Agricultural University,Changchun,People’s Republic of China

出　　处：《International Journal of Digital Earth》2023年第1期1094-1107,共14页国际数字地球学报（英文）

基　　金：supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA28100000);the K.C.Wong Education Foundation,Jilin Provincial Development and Reform Commission Innovation Capacity Building Project(grant number 2021C044-10);the Special fund project for high-tech indus-trialization of science and technology cooperation between Jilin Province and the Chinese Academy of Sciences(2021SYHZ0013).

摘　　要：Mapping soil organic matter(SOM)content has become an important application of digital soil mapping.In this study,we processed all Sentinel-2 images covering the bare-soil period(March to June)in Northeast China from 2019 to 2022 and integrated the observation results into synthetic materials with four defined time intervals(10,15,20,and 30 d).Then,we used synthetic images corresponding to different time periods to conduct SOM mapping and determine the optimal time interval and time period beforefinally assessing the impacts of adding environmental covariates.The results showed the following:(1)in SOM mapping,the highest accuracy was obtained using day-of-year(DOY)120 to 140 synthetic images with 20 d time intervals,as well as with different time intervals,ranked as follows:20 d>30 d>15 d>10 d;(2)when using synthetic images at different time intervals to predict SOM,the best time period for predicting SOM was always within May;and(3)adding environmental covariates effectively improved the SOM mapping performance,and the multiyear average temperature was the most important factor.In general,our results demonstrated the valuable potential of SOM mapping using multiyear synthetic imagery,thereby allowing detailed mapping of large areas of cultivated soil.

关 键 词：Sentinel-2 environmental covariates baresoilperiod synthetic images different time intervals soilorganic matter 

分 类 号：P237[天文地球—摄影测量与遥感]