生态环境学报2024，Vol.33Issue(12)：1849-1861,13.DOI:10.16258/j.cnki.1674-5906.2024.12.003
2016年以来广东省不同土地利用类型土壤pH和有机质时空变化及其影响因素分析
Temporal and Spatial Changes in pH and Organic Matter and Their Influencing Factors in Soils with Various Land Use Types in Guangdong Province since 2016
摘要
Abstract
Soil pH and organic matter content are important indicators for evaluating soil physicochemical properties and fertilizer retention capacity.To date,it remains poorly understood the temporal and spatial changes in pH and organic matter in the soils of Guangdong Province since 2016.In this study,changes in soil pH,organic matter content,and their influencing factors since 2016 were analyzed using fixed-point monitoring data from the entire Guangdong province.The results showed that the average value of soil pH was 5.41 for the whole province in 2016‒2018,with the average value of different land use types being ranked as follows:dry land>paddy field>garden land≈forest land.The average value of soil pH increased to 5.46 for the whole province during 2021‒2022,with the order of average values of different land use types being unchanged.Compared with the 2016‒2018 period,the average soil pH value of paddy field increased by 0.12 units while that of forest land decreased by 0.14 units during the 2021‒2022 period,with the most obvious fluctuations being observed in the mountainous areas of Northern Guangdong and some areas of the Pearl River Delta region.However,the average soil pH values did not change significantly in the dry or garden lands.The average soil organic matter was 24.07 g∙kg-1 for the whole province in 2016‒2018,with the average value of different land use types ranked as follows:paddy field≈forest land>garden land≈dry land.The average value of soil organic matter decreased to 23.23 g∙kg-1 for the entire province during 2021‒2022,with the order of average values of different land use types changing to paddy fields>forest land>dry land.There were no significant differences between garden and forest lands,or between garden and dry lands.Compared with the 2016‒2018 period,the average values of paddy field and forest land decreased by 0.93 g∙kg-1 and 3.84 g∙kg-1,respectively during the 2021‒2022 period,with the decreases being observed mainly in the mountainous areas of Northern Guangdong.However,the average values of soil organic matter did not change significantly in the dry and garden lands.Meteorological conditions,land use type,and fertilizer application are important factors that affect soil pH and organic matter content.Suitable and stable temperature and moisture conditions are conducive to slowing down soil acidification and promoting organic matter accumulation.The maintenance of paddy fields was conducive to improving the soil pH and maintaining a relatively high organic matter content.Compared to paddy fields and dry land,forest soils are more prone to acidification and are unfavorable for the accumulation of organic matter.The effect of chemical fertilizer application on soil pH was higher in dry land than in paddy fields,and the effects of phosphate and potassium fertilizers may be greater than those of nitrogen fertilizers.关键词
广东/土壤/pH/有机质/时空变化/影响因素Key words
Guangdong/soil/pH/organic matter/temporal and spatial changes/influencing factors分类
农业科技引用本文复制引用
罗小玲,刘军,王琦,刘同旭,梁耀杰,谢志宜,王中伟,陈多宏..2016年以来广东省不同土地利用类型土壤pH和有机质时空变化及其影响因素分析[J].生态环境学报,2024,33(12):1849-1861,13.基金项目
广东省重点领域研发计划项目(2020B1111370001) （2020B1111370001）
广东省生态环境保护专项资金资助 （）
