科尔沁沙质草地不同恢复年限草本层群落结构及其与土壤理化性质的关系

草本植物在沙地植被恢复过程中具有重要作用,研究自然恢复沙质草地草本层植物群落组成变化规律及其与土壤因子之间的关系,对植被与土壤恢复具有重要的意义.本研究对科尔沁严重退化沙地封育12、17年和20年的自然恢复沙质草地植物组成和土壤理化性质进行研究,同时分析了植物组成与土壤因子的相关关系.结果表明:随着恢复年限的增加,土壤...

Vegetation structure and its relationship with soil physicochemical properties in restoring sandy grassland in Horqin Sandy Land

Herbs play an important role in the process of vegetation restoration in sandy land ecosystem. It is very important to study the vegetation changes and its relationship with soil factors in natural sandy land restoration. This study focused on the vegetation composition and its relationship with soil physicochemical properties along 12-year， 17-year and 20-year restoration gradient in Horqin sandy grassland. The results showed that： with the restoration processing， soil organic matter， total nitrogen， available nitrogen， available potassium and slow-acting potassium increased significantly； plant species richness increased gradually； the proportion of Gramineae increased， while the proportions of Compositae and Chenopodiaceae decreased； The proportion of annual and biannual plant species decreased， while the proportion of perennial plant species increased； the vegetation height， coverage and above-ground biomass of herbaceous plants increased significantly； the species richness， dominance and diversity indices increased by 30.16%， 10.86% and 21.81% from 12-year to 20-year restoration， respectively； The plant community composition were mainly affected by soil water content （contribution rate of 30.77%） and soil available nutrients （contribution rates of available nitrogen， available phosphorus， and available potassium are 16.67%， 13.74%， and 7.69%， respectively） along sandy grassland restoration gradient. The results indicated that soil water content and soil available nutrients are the main factors affecting the restoration procedure of degraded sandy grassland in Horqin Sandy Land.