中文摘要：

通过引入聚集系数、变异系数和分形维数等参数揭示了不同围垦年限下的沿海滩涂土壤剖面盐分和粒径的分布特征,并且运用灰色关联度方法计算了土壤盐分与土壤粒径的相关联程度,结果发现：①随着围垦年限和人类活动强度的增加,沿海滩涂土壤中总体盐分含量逐渐下降,且表现出有农作物生长的田间的脱盐效果明显快于、好于无农作物生长的田边土壤。同时沿海滩涂土壤经历了＂均匀型-表聚型-震荡型-底聚型-震荡型-均匀型＂的变化趋势;②围垦20～60a的无盐土盐分处于临界轻度盐化土的状态,土壤次生盐碱化风险较高;③沿海滩涂土壤各层盐分表现出＂临层相关-隔层相关-上层相关＂的变化过程,各层与平均含盐量的相关性体现了土壤剖面含盐量向均匀型转变的特征;④土壤粒径逐渐变小,土壤肥力逐渐增加,并且有作物生长的田中央增加速度大于田边。土壤盐分与土壤粒径的关联度总体不强,粒径对土壤盐分的影响弱于人类活动。

英文摘要：

Tidal flats are an extremely basic reserve land resource, especially in countries where there is a large population but relatively limited land. The coastal area of Jiangsu province in China is a typical deposit where the analysis of the change in salt content in soil can reveal the evolution of soil salinity under different human activities. Here, parameters such as clustering coefficient, coefficient of variance and fractal dimension were used to reveal the distribution characteristics of the soil profile salt and particle size in tidal flats under different reclamation years. We found that as the number of reclamation years increased the total soil salt content in tidal flats decreased. The desalination effect of inner farmland is apparently better and faster than the edge of farmlands absent of plants. There is a process of‘even distribution profiles - surface accumulation profiles - oscillation profiles - bottom accumulation profiles - oscillation profiles - even distribution profiles＇ in tidal flats under the different reclamation years The non-saline soil of tidal flats reclaimed 20-60 years is in the situation of critical mild salinization, and the risk of soil secondary salinization is high. There is a process of‘adjacent layer correlation - compartment layer correlation - upper layer correlation＇in the different soil layers of the tidal flats. The particle size of soil has become finer, and the fertility of soil gradually increased.