基于典范对应分析的苏北滩涂土壤春季盐渍化特征研究

CHARACTERISTICS OF SOIL SALINIZATION IN MUDFLAT OF NORTH JIANGSU PROVINCE BASED ON CANONICAL CORRESPONDENCE ANALYSIS

运用常规统计学和典范对应分析方法,对苏北滩涂土壤全盐量(TS)、盐分离子组成、碱化度(ESP)、pH的空间分布特征进行了分析。结果表明,该区土壤为轻度至中度盐化,不同层次土壤中,Na+与Cl-、K+与Mg2+始终保持较好的关联性。TS的空间分布,在0～120 cm全剖面上主要受控于Cl-、SO24-、Na+因子,分层与全剖面的情况有所不同,但Na+均为主要因子之一;ESP在全剖面上主要受CO32-和HCO3-因子制约,其中在0～10 cm和20～40 cm土层主要受CO32-因子制约,10～20 cm土层内主要受HCO3-因子制约,40～100 cm土层则主要受Na+因子制约;pH受盐分离子的影响较小,在全剖面上分布较为均匀。

Spatial distribution characteristics of total salt content （TS）, ion components, exchangeable sodium percentage （ESP） and pH in the mudflat of North Jiangsu Province were investigated using conventional statistics and canonical correspondence analysis. Results show 1 ） the soil is slight to moderate in alkalization, e.g. moderate in topsoil （0 -40 cm） and slight in subsoil （40 - 120 cm） ; 2） Na＋ and Cl- , K＋ and Mg2＋ are well correlated in all soil layers; 3） Cl- , SO4^2- and Na ＋ are the main factors controlling spatial distribution of soil total salt throughout the profile, which though varies slightly from layer to layer, Na＋ remains to be one of the main factors; 4） the spatial distribution of ESP in the whole profile is restricted by CO3^2--and HCO3 , with the former affecting ESP mainly in the soil layers of 0 - 10 cm and 20 -40 em and the latter in the soil layer of 10 -20 cm. However, in the soil layer of 40 - 100 cm Na＋ is still the dominant one; 5） In the whole profile pH is more evenly distributed and slightly affected by salt ions.