衡阳地区杉木立地评价及其应用

对湖南衡阳市三个不同地貌区域的山区、孤山区及丘陵区，分别进行了立地质量评价调查研究，共取样地３６２块，优势木、解析木３６２株，并应用多元统计分析，对影响杉木生长的主导立地因子作了筛选，结果认为影响衡阳市杉木生长主导立地因子是中地貌、坡位、坡形、开阔度（ｍ）及土壤腐殖质层厚度与土层厚度。并以中地貌为依据划分了三个立地类型区；以坡位划分立地类型组；以坡形与土壤划分立地类型，同时编制了地位指数表，用以预测立地生产力。从评价立地质量得出，发展杉木以重山区生产力为最高，地位指数１４以上的立地占３５％以上；孤山及丘陵区只占３％～１５％。孤山及丘陵区不宜大面积发展杉木，只宜局部地方种植。

Site Evaluation of Chinese Fir and Its Application in Hengyang Area

Study and research on the site quality evaluation of three different geomor-phologie areas:mountainous are ,isolated area and hilly area,in Henyang of Hunan Provincewere condueted,totally 362 plots,362 dominant trees and sample trees for stem analysis.Screening through multivariate statistical analysis the guiding factors are: middle geomor-phy,form of slope,orientation of slope,open degree and thickness of soil humus and soil layerwhich impact the growth of Chinese fir.According to mid-eomorphy three different sitetype regions are divided,according to the position of slope three site type groups are differen-tinted as well as according to the form of slope and soil site types are determined.Site indext table is also produced to predict site productivity.Site quality productivity of overlap moun-tainous area is the highest,among which 35%of the area is covered by 14 and above 14 siteindex region,while isolated and hilly region only take up 3%~15%.Chinesefir should be lo-eally but not widely developed in hilly and isolated region.