江苏省海涂土壤的盐渍生态特征

ECOLOGICAL SALINIZATION CHARACTERS OF SEA BEACH SOIL IN JIANGSU

本文根据全省岸线不同季节采取的395个土壤剖面,经化验得到2089个盐分数据,分别进行不同土壤类型、不同季节和不同海涂生态类型的盐分剖面统计,揭示了海涂土壤的盐分剖面特征及盐分动态规律,并联系海涂土壤生态环境归纳为五种海涂土壤盐渍生态类型,以此论证了海涂土壤的盐渍地带规律。

In this paper, 395 soil profiles collected from coastal region of Jiangsu at different seasons were studied, on the basis of the analysed data of 2089 samples of different horizons, dynamic regime of salts in soils were revealed as fofollows: (1) The features of sea beach soil salinization process are that the salt distributed in profile are in the shape of cylinder, 'T' or 'Y'、with an average salt content of>0.7%; and in a state of salinization that water and salt move upward in whole year. The features of desalinization process are that the salts distributed in profiles are in the shape of pagoda, or sometimes of 'T' during dry season, with an average salt content of≤ 0.6%, and main dynamic regime of salts is going downwards with water. (2) It has been found there is a singnificant line between beach of meadow and that of Suaeda salsa, above which the desalinization process oceurs and below which the salinization process is going on. (3) Due to strict sequential development of eco-environment of tidal belt varying with topography and frequency of tidal intrusion, sea beach soils have significant regularity of distribution in belts.