Relationship between spatio-temporal evolution of soil pH and geological environment/surface cover in the eastern Nenjiang River Basin of Northeast China during the past 30 years  

作　　者：Guo-dong Liu Ming-hui Wei Ze Yang Hong-ye Xiao Yi-he Zhang Na-na Fang 

机构地区：[1]Shenyang Center of China Geological Survey,Ministry of Natural Resources,Shenyang 110034,China [2]Key Laboratory of Black Soil Evolution and Ecological Effect,Ministry of Natural Resources,Shenyang 110034,China [3]Key Laboratory of Black Soil Evolution and Ecological Effect,Liaoning Province,Shenyang 110034,China [4]Northeast Geological S&T Innovation Center of China Geological Survey,Shenyang 110034,China

出　　处：《China Geology》2023年第3期369-382,共14页中国地质（英文）

基　　金：supported by China Geological Survey(DD20230554,DD20230089);the Strategic Priority Research Program of the Chinese Academy of Science(XDA28020302);the funding project of Northeast Geological S&T Innovation Center of China Geological Survey(QCJJ2022-40).

摘　　要：To illuminate the spatio-temporal variation characteristics and geochemical driving mechanism of soil pH in the Nenjiang River Basin,the National Multi-objective Regional Geochemical Survey data of topsoil,the Second National Soil Survey data and Normalized Difference Vegetation Index(NDVI)were analyzed.The areas of neutral and alkaline soil decreased by 21100 km^(2)and 30500 km^(2),respectively,while that of strongly alkaline,extremely alkaline,and strongly acidic soil increased by 19600 km^(2),18200 km^(2),and 15500 km^(2),respectively,during the past 30 years.NDVI decreased with the increase of soil pH when soil pH>8.0,and it was reversed when soil pH<5.0.There were significant differences in soil pH with various surface cover types,which showed an ascending order:Arbor<reed<maize<rice<high and medium-covered meadow<low-covered meadow<Puccinellia.The weathering products of minerals rich in K_(2)O,Na_(2)O,CaO,and MgO entered into the low plain and were enriched in different parts by water transportation and lake deposition,while Fe and Al remained in the low hilly areas,which was the geochemical driving mechanism.The results of this study will provide scientific basis for making scientific and rational decisions on soil acidification and salinization.

关 键 词：Soil pH Spatio-temporal variation Surface cover Soybean-maize-rice Woodland-grassland-wetland Saline-alkali land-sandy land Geological environment Land quality geochemical survey engineering Nenjiang River Basin 

分 类 号：S153.4[农业科学—土壤学]