松嫩平原盐碱化反演及其动态变化过程

[目的]监测2000—2013年来松嫩平原盐碱地时空演变过程,为松嫩平原盐碱地防治提供理论依据。[方法]以MODIS影像为主要数据源,结合野外实测样点建立回归模型,对松嫩平原土壤含盐量进行定量反演。将整个研究时期分为3个时段:时段1(2000—2004年),时段2(2004—2008年),时段3(2008—2013年)。[结果]时段1和时段2盐碱地面积增加,增加速度为5 109.75和2 240.62km2/a,同时盐碱化程度加剧;以2008年为转折点,时段3盐碱地面积减少,主要是轻度盐碱地的减少,但是盐碱化程度仍在加剧。[结论]松嫩平原的盐碱化趋势不容乐观,应该采取紧急措施防止盐碱化程度进一步恶化,保护松嫩平原的生态环境健康发展。

Retrieval of Soil Salinization Process and Its Dynamic Change in Songnen Plain

[Objective] The objective of the study is to monitor the spatio-temporal evolution of saline soil in Songnen Plain and provide a theoretical basis for the prevention and treatment of saline soil in this region.[Methods] We established a regression model based on MODIS images and the field measured samples to retrieve soil salt content on Songnen Plain quantitatively.Study period can be divided into three sub-periods:period one(2000-2004),period two(2004-2008) and period three(2008-2013).[Results] The area of saline-alkali land increased and salinization was becoming worse in period one and two,and the rate of increase reached 5 109.75 km2/a and 2 240.62 km2/a respectively.After the turning point in 2008,the area of saline-alkali land(mainly the light saline-alkali land) decreased in period three,but the salinization degree was still growing.[Conclusion] Songnen Plain salinization is not optimistic,we should take emergent measures to prevent the further salinization and to ensure the healthy development of eco-environment of Songnen Plain.