皖南山区中部杉木林立地质量数量化评定的研究

<正>本文以皖南山区中部杉木林90块实测样地为资料,按照数量化理论(Ⅰ)的数学模型,用不带交互项与带交互项的反应表,以定型程序上机电算,分别编成立地质量数量化得分(评定)表。 通过对复相关系数、残差相对值分布及林分达标准年龄时的检验,认为在该地区采用立地质量数量化评定法对杉木丰产林进行宜林地选择、生产力预估及经营管理是可行的。 带交互项模型虽对复相关系数提高甚微,但预测值更接近于实际。梯形得分表便于使用单位根据当地的情况自行选定。

ASSESSMENT ON SITE QUALITY OF CHINESE FIR STAND IN SOUTHERN MOUNTAIN AREA OF ANHUI PROVINCE

In order to assess the site quality of Chinese fir (Cunninghamia lanceolata) stand quantitatively, data of 90 sample plots of Chinese fir stand in the middle of the southern mountain area of Anhui province were used to form a mathematical model according to the theory of quantification I, and then a scoring table for its site quality assessment is compiled by means of programed computation. Judging by the multiple correlation coefficient, the distribution of the relative value of residual error and the result of checking computation on the scoring table, this method of quantitative assessment on site quality of Chinese fir stand is cons sidered useful for land selection, prediction of forest productivity, and forest management. Though the multiple correlation coefficient of the model with interaction term is only a little higher than that of one without this term, yet the prediction value from the former is closer to the actual situation. The trapezoidal scoring table is convenient to the user to choose by himself according to the local conditions.