摘 要 ：用生物量(指地上部份)作为灌木林评价立地质量的指标,选出影响评价立地质量生物量的主要立地因子(沙丘流动程度、沙丘部位、沙丘大小等)和非立地因子(年龄、密度、平茬等),将质的数据,通过处理转为“量的数据”作为自变量,生物量作为因变量,建立数量化(I)数学模型,编制出9个灌木种,柠条(Carag-ana intermedia Kuang et H.C.Fu)、毛条(Caragana korshinskii Kom)、花棒(Hedysarum scoparium Fisch et Mey.)、踏郎(Hedysarum laeve B.Fedts-ch.)、沙柳(Salix psammophila C.Wang et Ch.)、紫穗槐(Amorpha frticosaL.)、沙棘(Hippophae rhamnoides L.)、白沙蒿(Artemista sphaerocephala T-rasch)、黑沙蒿(Artemisia ordosica Frasch)数量化表,其相关系数、剩余标准差、各项指标都达到要求。以此表为基础,对同一立地类型上各个灌木种生物量进行综合评价,按生物量的高低进行排序,目的是做到适地适树,能在各个立地类型上栽植最适宜的灌木种。在有林地区冠幅、灌高能集中反映灌木地上部分生物产量,可以建立多元回归数学模型,为估计有林地灌木种生物量提供一个简便的方法。
Abstract:The main site factors which enfluence the evaluations of site quality,including flow degree, position and size of sandhill, and nonsite factorsincluding age, density and cuting, are selected out by taking biomass (aboveground) as the index of evaluating site quality of shrub forest. The quantitative mathematic model is establishedd by converting qualitative data to quantitative data as the independent variable, and biomass to be the dependentvariable, by which quantitative tables for 9 shrub species, such as Caraganaintermedia, C.korshinskii, Hedysarum scoparium, H. lacve, Salix psammophila, Amorpha fruticosa, Hippophae rhamnoides, Artemisia sphaerocephala, A.ordosica, are drawn up. The correlation coefficient, surplus standard error, aswell as other indexes are adequate to demands. On the bases of the tables,the biomass of various shrub growing in the same type of site can be evaluatedcomprehensively so that the shrub species can be matched with the sites. Thecrown breadth and height of shrub reflect the boimass yield above ground,the multiple regression mathematic model can be established, which providesa simple method for evaluating the shrub biomass in the forest land.