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Scientia Silvae Sinicae ›› 2014, Vol. 50 ›› Issue (4): 47-54.doi: 10.11707/j.1001-7488.20140407

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Establishment of a Site Index Table for Quercus variabilis Natural Secondary Stand in Qinling Mountains

Zhang Yu, Jia Liming, Zheng Conghui, Zhang Xi   

  1. Key Laboratory for Silviculture and Conservation of Ministry of Education, Beijing Forestry University Beijing 100083
  • Received:2013-08-16 Revised:2013-11-07 Online:2014-04-25 Published:2014-05-06

Abstract:

This paper aims to build a site index table through mathematical models established with the relationships of age and height of the dominant individuals, so as to evaluate the site quality of the whole Qinling region. Totally 104 sample plots in a Quercus variabilis natural secondary stand on southern and northern slope in Qinling Mountains were selected, and 498 pairs of height-age relations data of 75 analytic and average dominant individuals were collected. Statistical software of ForStat 2.0 and SPSS 18.0 were used. The height-age curve model, lgH=-0.014 6 + 0.743 8lgA, was selected out of 12 mathematical models, with the reference age of 35 years and exponential distance of 2 meters. Six site index curves (10-20 m) of the Q. variabilis natural secondary stand were developed through the method of standard deviation adjustment. Eventually, the site index table for the Q. variabilis natural secondary stand was established. The table has high accuracy validated by the following four methods: correlation coefficient, X2 test, test of falling point and test of height growth increment. Thus, this method could be used on Q. variabilis natural secondary stand site evaluation in Qinling region.

Key words: Quercus variabilis, natural secondary stand, site index table, site quality evalucation

CLC Number: