土壤2025，Vol.57Issue(2)：265-274,10.DOI:10.13758/j.cnki.tr.2025.02.003
江苏东台盐碱耕地综合肥力特征及其影响因素
Comprehensive Fertility Characteristics and Influencing Factors of Saline-alkali Cultivated Land in Dongtai,Jiangsu Province
摘要
Abstract
To investigate soil fertility status of coastal tidal flat saline-alkali farmlands in Yancheng City,Jiangsu Province,a total of 108(0-20 cm)soil samples were collected based on the duration of reclamation,soil pH,total salinity(TS)and nutrients were measured,their spatial distribution characteristics were analyzed using geostatistical methods,soil integrated fertility indexes(IFI)were calculated with the modified Nemerow index method,and the primary factors influencing IFI were elucidated.The results showed that:1)The spatial correlations of soil pH,TS and total phosphorus(TP)were moderate,while the block-base ratio of soil nutrients exhibited strong spatial autocorrelation,which suggested that soil nutrients were more significantly constrained by natural conditions.2)The contents of soil organic matter(SOM),total nitrogen(TN)and alkaline-hydrolyzable nitrogen(AN)gradually decreased from west to east,which were contrary to that of soil pH,TS,total potassium(TK)and available potassium(AK).3)Soil IFI was lower,with reclamation duration,salinity-alkalinity barriers,and nutrient factors accounting for 93%of IFI variation.SOM had the most significant impact on soil IFI.SOM was significantly positively correlated with soil IFI in all short,medium and long-term reclamation years,indicating that SOM acted as the fundamental factor for soil IFI.Hence,the enhancement of coastal saline-alkali farmland should be focused on the organic regulation in order to elevate the content of soil organic matter,and ultimately promote the capacity of soil nutrient reservoir.关键词
滨海盐碱地/地统计学/内梅罗综合指数/土壤综合肥力评价Key words
Coastal saline-alkali lands/Geostatistics/Nemerow composite index/Soil comprehensive fertility evaluation分类
农业科技引用本文复制引用
王志旺,王世航,徐灵颖,陈玉琪,许梦乾,孙佳蓓,罗越,赵旭..江苏东台盐碱耕地综合肥力特征及其影响因素[J].土壤,2025,57(2):265-274,10.基金项目
中国科学院战略性先导科技专项(XDA0440000)和江苏省基础研究专项资金(自然科学基金)面上基金项目(BK20242107)资助. （XDA0440000）
