摘要
为研究滨海滩涂盐碱耕地土壤肥力状况,结合围垦年限采集江苏盐城108个样点,采用地统计学方法分析土壤p H、含盐量(TS)和养分指标的空间分布特征,采用改进后的内梅罗指数法计算土壤综合肥力,阐明其关键影响因素。结果表明:(1)除土壤pH、TS、全磷(TP)呈中等的空间相关性外,其他土壤养分指标均有强烈的空间自相关性,说明土壤养分受自然条件约束更为显著;(2)土壤有机质(SOM)、全氮(TN)、碱解氮(AN)含量从西向东逐渐减少,而土壤p H、TS、全钾(TK)、速效钾(AK)则呈递增趋势;(3)滨海滩涂盐碱耕地土壤综合肥力较差,开垦年限、盐碱障碍和养分因素共同解释了93%的变异,其中SOM对土壤综合肥力指数(IFI)的影响最为显著。无论是短期、中期,还是长期围垦,SOM均与IFI呈显著正相关,说明SOM是滨海滩涂盐碱耕地土壤综合肥力的基础。因此,滨海盐碱耕地改良要注意有机调控,提高土壤有机质含量,最终增加土壤养分库容。
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.
作者
王志旺
王世航
徐灵颖
陈玉琪
许梦乾
孙佳蓓
罗越
赵旭
WANG Zhiwang;WANG Shihang;XU Lingying;CHEN Yuqi;XU Mengqian;SUN Jiabei;LUO Yue;ZHAO Xu(School of Spatial Information and Geomatics Engineering,Anhui University of Science and Technology,Huainan,Anhui 232001,China;Changshu National Agro-Ecosystem Observation and Research Station,Institute of Soil Science,Chinese Academy of Sciences,Nanjing 211135,China;School of Resources and Environment,Anqing Normal University,Anging,Anhui 246133,China)
出处
《土壤》
北大核心
2025年第2期265-274,共10页
Soils
基金
中国科学院战略性先导科技专项(XDA0440000)
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。
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
Coastal saline-alkali lands
Geostatistics
Nemerow composite index
Soil comprehensive fertility evaluation
