浑善达克沙地多伦县流动沙地飞播成效调查

The Effectiveness Survey of Aerial Seeding for Mobile Sandy Land in Duolun County Otindag Desert Land Survey

长期连续定位调查结果对客观评价飞播固沙成效的动态变化具有重要意义。采用典型样地定位调查方法,连续测定了2004—2018年浑善达克沙地多伦县流动沙地飞播区植物生长的动态变化。结果表明,随着飞播后植物生长年限的增加,播区植物生长经历了一个缓慢并波动的过程,植物密度和植物种类均呈现多项式模型,植被盖度和生物量均为指数模型。典型样方内植物群落结构特征发生明显变化,植物种类从8种逐渐增加到19种,多年生乡土植物种从无到有,并逐渐增加到6种,植被平均盖度从21.65%增加到60.00%,生物量从22.30 g/m 2增加到56.70 g/m 2。植被盖度、生物量、植物种类和年度降雨具有显著相关性,而植物种密度和年降雨的相关性较差。飞播固沙后植物生长经历了一个缓慢并波动的过程,植被盖度、多年生乡土植物逐渐增加,群落结构逐渐发生实质性变化。

The results of long-term continuous positioning surveys have great significance for the objective evaluation of the dynamic changes in the effectiveness of aerial seeding sand fixation.A typical sample plot location survey method was used to be continuously measured the dynamic changes of plant growth in the mobile sandy aerial seeding area of Duolun County,Otindag Desert Land from 2004 to 2018.The results showed that plant growth experienced a slow and fluctuating process with the increase of plant growth years after aerial seeding.At the same time,the plant density and plant species were both the expressed the polynomial model,but the vegetation coverage and biomass were both the exponential models.Significant changes of plant community structure characteristics was led in typical plots,which the plant species gradually increased from 8 to 19 kinds,perennial native plant species was started from nothing to gradually increased to 6 species,the average vegetation coverage increased from 21.65%to 60.00%,and the biomass increased from 22.30 g/m 2 to 56.70 g/m 2.The correlations of the vegetation coverage,biomass,plant species and annual rainfall were significant,but the correlation between plant species density and annual rainfall was poor.The plant growth experienced a slow and fluctuating process after the aerial seeding and sand fixation,which the vegetation coverage and perennial native plants gradually increased,at the same time the community structure gradually changed substantially.