秦岭火地塘天然次生油松林倒木密度与含水量变化特征研究

Characteristics of fallen wood density and water content dynamics of Pinus tabulaeformis natural secondary forests in Huoditang region in Qinling mountains

以秦岭火地塘天然次生油松林内的油松和漆树倒木为研究对象,测定了2个树种不同腐烂等级的倒木密度和含水量的年变化。结果表明:油松和漆树的倒木密度达到极显著差异,同一树种五个腐烂等级间的倒木密度差异同样达极显著。对油松和漆树倒木的密度-腐烂等级间的关系进行拟合结果表明,倒木随腐烂等级的增加,密度呈直线下降。油松和漆树倒木含水量与腐烂等级间存在显著的线性关系,随腐烂等级的增加,倒木含水量呈直线上升。对秦岭火地塘林区降雨量和相对湿度与油松和漆树不同腐烂等级倒木含水量间进行相关分析表明,油松和漆树不同腐烂等级的倒木含水量与降雨量间存在显著相关性,而与空气相对湿度间相关性不显著。

The annual change of different tree species and decay classes of fallen wood density and water content swere measured in a Pinus tabulaeformis natural secondary forest in Huoditang forest region in Qinling Mountains. There were significant differences between the density of P tabulaeformis and Toxicodendron vernicifluum, the same differences also existed among the density of the same tree at five different decay classes. With the decomposition of P tabulaeformis and T. vernicifluum, the density of fallen wood decreased at linear trend, the water content of fallen wood increased at linear trend. There was significant correlation between the water content of different decay classes ofP tabulaeformis and T. vernicifluum fallen wood and the precipitation in Huoditang forest region in the Qinling Mountains, but no significant correlation with relative humidity.