沙地樟子松天然更新与降水因子的灰色关联度分析

沙地樟子松人工固沙林的天然更新在大部分引种地不能很好地进行，其天然更新存在着某些障碍因子。通过对辽宁省昌图县傅家林场樟子松天然更新情况的调查，采用灰色关联度分析的方法，对更新与降水因子的关系进行了分析。结果表明，更新产生的当年12月和翌年1，2月的降水量，即冬季降雪情况与天然更新关联最大。说明了冬季降雪是影响樟子松天然更新的一个关键因子。

The gray correlative analysis on the relationship between the natural regeneration and the precipitation for Pinus sylvestris var. mongolica plantation in sandy land

The natural regeneration of Pinus sylvestris var. mongolica plantation in sandy land couldn't be accomplished well in many introduction area, which have some barriers unknown. In this paper, based on the investigation of the situation of Pinus sylvestris var. mongolica in Fujia forest farm Liaoning province, using the methods of gray correlative analysis, the relationship between the natural regeneration and the precipitation was analysed. The result shows: the most relationship lies in between the natural regeneration and the precipitation of December present year, January, February the second year. So the snowfall in winter is an important fact for the natural regeneration of Pinus sylvestris var. mongolica.