作 者：
王朋飞;杨思存;陈英;王成宝;霍琳;姜万礼
单 位：
甘肃省农业科学院土壤肥料与节水农业研究所;甘肃农业大学资源与环境学院
关键词：
盐碱地;盐渍化特征;典范对应分析;河西绿洲灌区
摘 要：
【目的】探讨河西绿洲灌区盐渍化土壤全盐(TS)、pH值与盐分离子的数量关系及其对盐碱地类型、分布的影响.【方法】在河西绿洲灌区的甘州区和临泽县选择典型区域取样,运用常规统计学和典范对应分析方法,研究了土壤TS、pH值、盐分离子的剖面分布、数量关系和影响因子.【结果】剖面中的阳离子以Ca2+和Na+为主,阴离子以SO42-为主,土壤pH介于8.55~8.63.不同土层内,K+与Mg2+、Ca2+与SO42-始终有较好的关联性,Na+与Cl-在0~20cm和40~100cm土层、SO42-与Na+在20~40cm土层、K+与Na+在40~80cm土层有较好的关联性.在0~100cm全剖面上,pH的空间分布受HCO3-和Na+的影响较大,TS受SO42-、Cl-和Ca2+的影响较大.分层与全剖面的情况有所不同,0~20cm土层内TS和pH的空间分布主要受控于SO42-含量,20~40cm土层内受Cl-、Na+-、Ca2+和SO42-共同影响,40~60cm和60~80cm土层内K+是主要影响因素,80~100cm土层内主要受控于K+和Mg2+含量.CCA第1排序轴反映了TS的变化情况,第2轴反映了pH的变化情况,第1轴特征值在0.57~0.74,解释方差在41.5%~52.4%;第2轴特征值在0.35~0.62,解释方差在36.2%~45.7%,TS是决定项目区盐碱地类型和分布的主要因素.【结论】该区土壤为轻度至重度盐化,剖面土壤盐分呈"T"型分布,具有明显的表聚特征.
译 名：
Characteritics of soil salinization based on canonical correspondence analysis method in the Hexi oasis irrigation district of Gansu Province
作 者：
WANG Peng-fei;YANG Si-cun;CHEN Ying;WANG Cheng-bao;HUO Lin;JIANG Wan-li;College of Resources and Environment,Gansu Agricultural University;Institute of Soil,Fertilizer and Water-saving Agriculture,Gansu Academy of Agricultural Sciences;
关键词：
saline-alkali land;;salinization characteristics;;canonical correspondence analysis;;Hexi oasis irrigation district
摘 要：
【Objective】To study the quantitative relationship between distribution of TS,pH value and salt ion in soil profile in the Hexi oasis irrigation district,and the effects of them on types and distribution of saline-alkali soil.【Method】The soil samples were collected from the typical area of Ganzhou District and Linze County in the Hexi oasis irrigation district,conventional statistics and canonical correspondence analysis were used to research the distribution of TS,pH and salt ion in soil profile,quantitative relationship among them and impacting factors.【Result】The cation and anion in soil profile were Ca2+,Na+and SO42-respectively,with pH value varying between 8.55 and 8.63.K+and Mg2+,Ca2+and SO42-were well correlated in all soil layers,the correlation between Na+and Cl-in the layers 0~20cm and 40~100cm,SO42-and Na+in 20~ 40 cm soil layer,K+and Na+in 40~ 80 cm soil layer were all well linked.In 0~100cm soil profile,the spatial distribution of pH was mainly controlled by HCO3-and Na+,TS was mainly controlled by SO42-,Cl-and Ca2+,respectively.In different soil layers,The spatial distribution of pH,TS and salt ion were different from that in the whole soil profile,the distribution of pH and TS were mainly controlled by SO42-in 0~20cm soil layer,by Cl-、Na+、Ca2+and SO42-together in 20~40cm layer,by K+in40~60cm and 60~80cm layers,by K+and Mg2+in 80~100cm soil layer.Axis1 and axis 2of CCA reflected the changes of TS and pH value,respectively.The eigenvalues and cumulative percentage varied from0.57 to 0.74 and 41.5%to 52.4% of axis 1,respectively,and they varied from 0.35 to 0.62 and 36.2%to45.7% of axis 2correspondingly.TS was the main factor determining the type and distribution of saline-alkali land in the Hexi oasis irrigation district.【Conclusion】The soils in the region were lightly to severely salinized,the salt content showed T-shaped distribution pattern and obviously accumulated in surface soil.
