Map scale effects on soil organic carbon stock estimation in north China

Yongcun Zhao, Xuezheng Shi, David C. Weindorf, Dongsheng Yu, Weixia Sun, Hongjie Wang

Research output: Contribution to journalArticlepeer-review

59 Scopus citations

Abstract

Digital soil maps of different scales have been compiled in China, but exactly how map scale affects the estimation of regional SOC (soil organic carbon) stocks remains unclear. To test the effect, median, mean, and a pedological professional knowledge based method (PKB) were used to ink soil profiles to soil maps at five scales ranging from 1:500 000 to 1:10 000 000 for the Hebei Province. Excluding the 1:4 000 800 soil map, SOC stocks decreased as the map scale decreased. The estimated SOC stocks obtained using the mean were always higher than those using the median or PKB method. The changes in estimation due to different map scales and linking methods affected the process of assigning SOCD (soil organic carbon density) values to digital soil surveys. The differences in SOCD values resulted from the change in the total nonurban land area of each soil type as a result of the different methods and scales of maps used in the regional SOC stock estimation process.

Original languageEnglish
Pages (from-to)1377-1386
Number of pages10
JournalSoil Science Society of America Journal
Volume70
Issue number4
DOIs
StatePublished - Jul 2006

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