秦岭林区天然次生林与人工林立地质量评价

doi:10.11707/j.1001-7488.20150410

Abstract

Abstract:

【Objective】 Site quality is essential for stand development. Stands established with natural or artificial regeneration methods requiring effective approaches to evaluate the site productivity in forestry practice. The purpose of this study was to evaluate the site quality for secondary forests and plantation using site index and site form models. 【Method】The permanent and temporary inventory data, and the stem analysis data, were collected from pine-oak stands in Qinling Mountains. Feasibility of applying site index models for secondary forests was validated by cumulative frequency curve and SW normality tests. Reference age and DBH were determined by analyzing of mean height increment and current annual height increment. Methods for formulating site index and site form tables, such as ratio method, standard deviation adjustment, and coefficient variation adjustment were applied by species after fitting dominant height growth equations. Chi-Square test, falling point test and correlation test were used for accuracy analysis of site index and site form for secondary forest and plantation. MRES, AMRES, MRES% were applied for error analysis of site class, site index and site form. 【Result】Chi-square values of each species were lower than critical values. Chi-square values of site index of Pinus tabulaedormis and Larix principis-rupprechtii were lower than that of site form. Chi-square value of site index of Quercus aliena var. acuteserrata was higher than that of site form. Little difference among site index and site form of Pinus armandii was observed. In general, site form appears superior for secondary forests, while site index is suitable for plantation. Site index and site form were more accurate than site class in evaluating the site quality. 【Conclusion】 Establishing site index tables and site form tables could be used for site evaluating in forest management. Further study of mixed and uneven-aged secondary forest site quality evaluation is required.

Key words: forest site evaluation, secondary forest, plantation, site index, site form, Qinling Mountains

CLC Number:

S757

Wu Heng, Dang Kunliang, Tian Xianglin, Sun Shuaichao, Chen Shujun, Zhao Pengxiang, Cao Tianjian. Evaluating Site Quality for Secondary Forests and Plantation in Qinling Mountains[J]. Scientia Silvae Sinicae, 2015, 51(4): 78-88.

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Evaluating Site Quality for Secondary Forests and Plantation in Qinling Mountains

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