摘要
【目的】以江西省泰和县为研究区域,揭示县域尺度耕地土壤有机质(SOM)的空间分布规律。【方法】设计覆盖整个泰和县耕地的采样网络,采集361个表层(0~20 cm)土壤样品。使用普通克里格插值法探究研究区耕地土壤有机质含量的空间分布特征,利用随机森林模型结合经典统计方法探究泰和县耕地土壤有机质空间分异的主要影响因素。【结果】研究区耕地土壤有机质含量均值为31.05 g kg^(-1),处于较丰富水平,表明泰和县耕地土壤肥力水平较好。泰和县耕地土壤有机质具有中等程度的空间自相关性,具有中部低、东西高的空间分布特征。秸秆还田和海拔是耕地土壤有机质含量的主要影响因子,解释率为56.37%和18.73%。土壤pH、成土母质、施肥量和灌溉能力对土壤有机质含量也具有显著影响,解释率分别为9.66%、9.47%、6.76%和5.45%。【结论】采取秸秆还田、合理施用石灰和完善排水设施等田间管理措施可以有效提高耕地土壤有机质含量,改善土壤保肥固碳能力,对促进农业可持续发展,助力实施国家“碳达峰”和“碳中和”战略具有重要价值和意义。
[Objective]The Taihe County of Jiangxi Province was taken as the research area to reveal the spatial pattern of soil organic matter(SOM)content and its influencing mechanism at the county scale.[Method]In this study,361 surface(0-20 cm)soil samples were collected in Taihe County.Then the ordinary kriging,random forest and classical statistical methods were used to analyze the spatial pattern of SOM contents as well as to calculate the importance of different natural and anthropogenic factors on SOM variation.[Result]The average SOM content in the study area was 31.05 g kg^(-1),which indicates a good fertile of farmland soil in Taihe County.The SOM content showed obvious spatial autocorrelation,which has the spatial distribution characteristics of low in the central region and high in the east and west.The main driving factors of SOM content in the study area were returning straw,and altitude with relative importance of 56.37%and 18.73%,respectively.The pH,parent materials,chemical fertilizer application and irrigation also clearly contributed to SOM,with relative importance of 9.66%,9.47%,6.76%and 5.45%,respectively.[Conclusion]Reasonable soil management measures such as straw returning and good drainage conditions can effectively improve the soil organic matter content of cultivated land,as well as carbon sequestration ability,and thus contribute to promote the sustainable development of agriculture and achieving carbon peaking and carbon neutrality strategies.
作者
李洪义
贺任彬
谢模典
习梦琴
刘玉婷
邓婉茗
王俊婕
胡碧峰
陈颂超
史舟
LI Hong-yi;HE Ren-bin;XIE Mo-dian;XI Meng-qin;LIU Yu-ting;DENG Wan-ming;WANG Jun-jie;HU Bi-feng;CHEN Song-chao;SHI Zhou(Department of Land Resource Management,School of Tourism and Urban Management,Jiangxi University of Finance and Economics,Nanchang 330013,China;Institute of Agricultural Remote Sensing and Information Technology Application,Zhejiang University,Hangzhou 310058,China;ZJU-Hangzhou Global Scientific and Technological Innovation Center,Hangzhou 311200,China)
出处
《土壤通报》
CAS
CSCD
北大核心
2023年第5期1050-1059,共10页
Chinese Journal of Soil Science
基金
国家自然科学基金项目(42201073、42071068)
江西省社会科学基金项目(21YJ43D)
江西省教育厅科技项目(GJJ210541)
江西省“双千计划”创新领军人才长期(青年)项目(jxsq202301091)
江西省自然科学基金(20232BAB213058)资助。
关键词
土壤有机质
人为及自然因素
普通克里格
随机森林
土壤管理措施
Soil organic matter
Anthropogenic and environmental factors
Ordinary kriging
Random Forest
Soil management measure
