沙地樟子松天然更新影响因素探讨

摘要

Based on the meteorological data and many research achievements, the factors influencing natural regen- eration of Pinus sylvestris var. mongolica in sandy land have been analyzed on the aspects of the process of natural regeneration and the features of meteorological factors in origin. The results show that the naturally falling seeds from April to May are the material base for realizing the natural regeneration of Pinus sylvestris var. mongolica. The snowfall days, the snow cover days, the relative humidity fi'om May to July and the average temperature from May to July are the main factors influencing the natural regeneration of Pinus sylvestris var. mongolica. Among them, the relative humidity from May to July and the average temperature from May to July are the key factors influencing the germination of the naturally falling seeds and the growth of seedlins of Pinus sylvestris var. mongolica. The snowfall days and snow cover days can influence the current year seedlings to overwinter safely.%根据气象资料和诸多研究结果,从沙地樟子松自然更新过程以及原产地气象因子的特征等方面进一步分析了沙地樟子松天然更新的影响因素,结果表明：沙地樟子松当年4～5月自然落种的种子是实现自然更新的物质基础;降雪日数、积雪日数、5～7月相对湿度、5～7月平均温度等是影响沙地樟子松自然更新的主要因素。其中,5～7月相对湿度、5～7月平均温度变化特征是影响沙地樟子松自然落种的种子萌发及其幼苗生长的关键因素,而降雪日数、积雪日数是影响并决定当年幼苗安全越冬的保证。