祁连山区小流域青海云杉材积生长差异性

Diference in stem volume of Qinghai spruce(Picea crassifolia ) in catchments of Qilian Mountains

以祁连山区排露沟流域和天老池流域的青海云杉为研究对象,利用野外采集的树轮数据通过ForStat软件计算了青海云杉的5年连年材积生长量.首先分析了两个流域内的青海云杉材积生长量在海拔梯度上的差异,然后对比分析了两个流域相同海拔高度上材积生长量的差异.结果表明:青海云杉的5年连年材积生长量随着海拔梯度增加呈现出先增大后减少的趋势.在天老池和排露沟流域材积生长较好的青海云杉分别出现在2950～3050 m海拔带和2800～2900 m海拔带.除2850 m外的大多数海拔高度上,天老池流域的材积生长量要高于排露沟流域的.研究结果显示青海云杉的5年连年材积生长量具有显著的空间差异.

Pailougou catchment and Tianlaochi catchment in Qinlian Mountains were selected as study areas. Based on tree-ring samples, the stem volume of Qinghai spruce (Picea crassifolia ) within five years was calculated by Forestry Statistics (ForStat) software. Firstly, we compared the stem volume in two catchments on different elevations. Secondly, we compared the stem volume on the same elevation of the two catchments. The results showed that the stem volume within five years first increased and then decreased with the altitude increase. The bigger stem volume appeared in elevation zone of 2 950～3 050 m in Tianlaochi catchment and 2 800～2900 m in Pailougou catchment, respectively. Except for 2 850 m, the stem volume in Tianlaochi catchment was bigger than that of Pailougou catchment. We could draw conclusion that there was a significant spatial difference in the stem volume of Qinghai spruce within five years.