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滩涂围垦是沿海地区开拓土地资源和缓解人地矛盾的重要措施,土壤环境也因此发生剧烈变化。以江苏如东县沿海不同年限的垦区土壤为研究对象,探讨土壤pH值、有机质和氮、磷、钾速效养分的分布情况,pH值、有机质和速效养分之间的关系,以及这种相关性随垦区围垦年限而发生的变化。结果表明:如东滩涂围垦区土壤呈碱性,土壤养分较为缺乏;随着围垦年限的增加,垦区土壤pH值下降,土壤养分呈增加趋势,垦区围垦年限对土壤pH值、有机质与速效养分之间的相关性存在一定影响,其中10a围垦期是pH与有机质、速效磷之间相关性变化的转折点。围垦年限不仅对垦区土壤pH值、土壤有机质和速效养分的绝对含量有着明显影响,还影响土壤pH值、有机质与土壤速效养分之间的相关关系,随着垦区围垦年限的增加,人为活动影响程度加深,土壤逐渐从自然的滨海盐土向农业土壤演化,土壤要素间的相关关系逐渐向一般耕作土壤靠近。
Tidal flat reclamation is an important measure to open up land resources and alleviate the contradiction between people and land in the coastal areas. As a result, the soil environment changes drastically. Taking the reclaimed soil of different years along the coast of Rudong County of Jiangsu as the research object, the relationship between the distribution of soil available pH, organic matter, N, P and K available nutrients, pH value, organic matter and available nutrients was discussed, and the correlation Changes with reclamation area reclamation years. The results showed that the soil in the reclamation area of Rudong was alkaline and the soil nutrient was scarce. With the increase of reclamation years, the pH of reclaimed land decreased and the soil nutrients increased. The reclamation age of reclaimed area affected the soil pH, organic matter and available nutrients Among them, 10a reclamation period is the turning point of the correlation between pH and organic matter and available phosphorus. The years of reclamation not only have an obvious influence on the soil pH value, absolute content of soil organic matter and available nutrients, but also affect the relationship between soil pH, organic matter and soil available nutrients. With the reclamation age of reclamation area increasing, the impact of human activities Deeper, the soil gradually from the natural coastal saline soil to agricultural soil evolution, the correlation between soil elements gradually to the general farming soil close.