低温雪灾对莽山保护区植被NPP影响的遥感评价

Evaluation on Effect of Snowstorm on Vegetation NPP in the Protected Area of Mangshan Based on Remote Sensing

低温雪灾对植被的影响不仅体现在对植被外在植株的损害上,还体现在对植物内在生理活动的破坏方面。因此,低温雪灾对植被影响的评价应立足植被恢复较长一段时间的植被变化。以2008年1月的低温雪灾为背景,选择反映植被生长特性的植被净初级生产力为研究对象,以受人类活动干扰程度较小、能较好体现植被自然恢复的莽山保护区为研究区,构建了光能利用率模型(CASA模型),对低温雨雪灾害发生前和发生两年后的植被净初级生产力进行了估算,通过其变化情况来衡量低温雨雪对植被的影响。还对不同地形条件下、不同林龄和树种的植被NPP受低温雪灾影响的差异进行分析,以期为整个莽山乃至南方受灾地区灾后评价和重建决策提供数据支持。

The effect of snowstorm on plants is expressed not only the external damage,but also the inherent physiological activities.Therefore,the evaluation of the impact of vegetation restoration should be based on a longer period of vegetation changes.Taking the snowstorm in January 2008 as the case,the paper chosed the vegetation net primary productivity（NPP） that reflected the ability of vegetation productivity as indicator and selected Mangshan protected area with less effect by human activities as study area.The paper built light use efficiency model based on the CASA model,estimated the NPP of the year before the snowstorm and two years after it,and elevated the effect of snowstorm on vegetation and changes of plant NPP.The paper also analyzed the effect of snowstorm on vegetation in the aspect of different terrain,different ages and different species,so as to provide data support for the decision-making of post-disaster assessment and reconstruction in Mangshan protected area and even the south disaster area.