摘要
松嫩平原地处半湿润半干旱内陆季风气候,干湿分明,春季增温迅速,风力强劲,土壤蒸发强烈.冻融时期,盐渍土壤水热盐分布格局与非冻融性盐渍土存在显著差异.研究冻融土壤的水盐分布格局表明土壤饱和含水量线呈现“>”形分布结构,总盐分含量和碱化度(ESP)的等值线呈“∧”形分布结构.消融期季节,地温梯度具有多向性和双似冻层的土体热力构型.冻融季节,水分分布场、地热格局和盐分分布场有密切相关.根据系统统动力学原理,建立水热盐复合模型,寻求春季盐渍土积盐机理,为松嫩平原盐渍土壤资源开发利用提供理论基础.
Songnen plain is located in Northeast of China, which belongs to the semiarid monsoon climate,with the entirely difference between draught and wet seasons. The temperature ascends abruptly in spring,together with the strong wind,which causes the vast evaporation of soil water. The distribution pattern of the soil water, geothermal and soil salt presents a distinct difference to the region without the effect of frozen and thawing during the thawing season. The distribution pattern was studied scientifically. It reveal that the structure of contour of saturated soil water presents like＂〉＂and that of total salt amount and ESP looks like ＂∧ ＂. The gradient of geothermal appears the bi-directional feature. There are double frozen fringes in the geothermal structure during thawing season. The geothermal pattern combines the soil water field and soil ion field with closely correlations. Based on the system dynamic theory,a combined model between soil water,geothermal and salt was built up to seek the mechanism of salt built-up in spring. The study will supply a theory foundation to develop the saline soil resource in songnen plain.
出处
《内蒙古大学学报（自然科学版）》
CAS
CSCD
北大核心
2007年第2期209-215,共7页
Journal of Inner Mongolia University：Natural Science Edition
基金
国家自然基金资助课题"松嫩平原洪水资源利用与湿地生态环境管理"(50139020)
关键词
松嫩平原
冻融作用
盐渍土
分布格局
积盐机理
Songnen plain
the effect of frozen and thawing
saline soil
distribution pattern
the mechanism of salt accumulation
