毛乌素沙地立地质量的综合评价

用生物量（指地上部份）作为灌木林评价产地质量的指标，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，毛条，花棒，踏郎，沙柳，紫穗槐，黑沙蒿数量化表，其相关系数，剩余标准进行综合评价，按生物量的高低进行排序，目的是到...

COMPREHENSIVE EVALUATION OF SITE QUALITY OF MAOWUSU SAND LAND

The main site factors which enfluence the evaluations of site quality,including flow degree, position and size of sand-hill, and non-site factorsincluding age, density and cuting, are selected out by taking biomass (aboveground) as the index of evaluating site quality of shrub forest. The quantita-tive mathematic model is establishedd by converting qualitative data to quanti-tative 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 psammop-hila, 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.