青钱柳人工林在豫南地区冠积特征分析

The Crown Volume Characteristics of Cyclocarya paliurus Plantation in Southern Henan Province

通过分析豫南地区青钱柳人工林树冠、胸径、树高在不同海拔地带,不同密度样地发育情况,确定冠积和树木生长指标的定量关系.试验表明,青钱柳在豫南地区较低海拔地区生长较快,而林地海拔较高时,冠积生长变慢,林间空隙变大,不同海拔各分级木冠积差异明显;青钱柳在林木密度较大时,树高与冠积的相关性反而会更大,当林木密度较小时林间空地增多,杂树杂冠增加当密度较小时被压木减少,影响冠积生长的因子变多;7~9年生的青钱柳密度为1200株/hm^2冠积指标最高;不同海拔、不同密度样地青钱柳的胸径、树高与冠积均呈线性相关.

Based on analyses of the crown growth,DBH and height of Cyclocarya paliurus in different altitudes and densities,the quantitative relation ship of the crown volume and growth index of C.paliurus in southern Henan Province was determined.The results show that C.paliurus in southern Henan Province grows faster at lower altitudes,while the crown volume of C.paliurus at higher frost land altitudes grew slower and the forest gap was larger.There was significant difference in the average crown volume of classified stem at different altitudes.When the density of trees is larger,the correlation between tree height and crown volume was greater.When the density of trees is smaller,the forest gap and micellaneous will increase,the overtopped trees will decrease,and the factors affecting crown volume growth will increase.The highest crown volume density index is 1200 plants/hm^2 for 7-9 years C.paliurus.The DBH,tree height and crown volume of C.paliurus are linearly correlated in different altitudes and densities.