松嫩平原西部土壤盐渍化逆向演替的影响因子与调控系统

Study on influencing factors and control system of reversal evolvement in Western Songnen Plain

松嫩平原西部属草甸-草原苏打盐渍土生态区,由于自然及人为因素的影响,形成了大面积的盐渍土.利用自然条件及人工调控方法可以使盐生植被得以恢复,利用植物根系与土壤的相互作用改善土壤的理化性质,可以使一些中等耐盐植物能入侵进来.在环境逐渐好转的过程中,入侵植物的种类也不断增加,使盐渍化前的大部分优势种逐渐恢复,使生境得到改善,实现土壤盐渍化的逆向演替.旨在建立松嫩平原西部土壤盐渍化的逆向演替调控系统,找出促进逆向演替的影响因子,提高盐碱地的生产力,进而使区域环境逐渐向良性转化.

The Western Songnen Plain belongs to bedding-grassland ecological region.Because of natural and artificial factors,it is becoming a large alkili-saline area.Firstly, create conditions to help salt-endured plants grow on it.The soil physical-chemical quality can be improved by the interaction between soil and the roots of plants.Secondly,some slightly salt-endured plants inbreak.With the improvement of soil quality,the kinds of inbreaking plants will increase constantly.At last,most of the predominant species growing on tbe soil before alkili-salinization can restore here.This time the soil is almost restoring to its normal condition,so call this phenomenon reversal evolvement.It's important to study the controlling system of reversal evolvement and find out the main influencing factors to increase the productivity of alkili-saline land and promote regional environment into a better condition.