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Scientia Silvae Sinicae ›› 2011, Vol. 47 ›› Issue (2): 15-24.doi: 10.11707/j.1001-7488.20110203

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Effects of Selective Cutting on Stand Growth and Structure for Natural Mixed Spruce (Picea koraiensis )-Fir (Abies nephrolepis) Forests

Hu Yunyun1,2, Min Zhiqiang1, Gao Yan3, Feng Qixiang3   

  1. 1. Key Laboratory for Silviculture and Conservation of Ministry of Education, Beijing Forestry University Beijing 100083;2. The Northwest Institute of Forest Inventory, Planning and Design, SFA Xi'an 710048;3. Wangqing Forestry Bureau,Jilin Province Wangqing 133200
  • Received:2010-01-29 Revised:2010-12-26 Online:2011-02-25 Published:2011-02-25

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Abstract:

Twenty plots in natural spruce-fir forests, after initial selective cutting with different intensity (control, 20%, 30%, 40%), were set to study effects of the different cuttings on stand growth and structure in a few year when the second cutting was conducted, and changes of stand growth and structure in different recovery periods with 2-4 more cuttings after the initial cutting were analyzed in this paper. Results showed that the annual growth rates of stand DBH and volume after the initial selective cutting were higher than that of un-cutting control stands. After the initial cutting they gradually increased, and then the rates began to decline in 4-6 years, until to the next cutting. The annual growth rate of stand volume in the plots with the initial cutting of 20 % was not significantly different from the plots with cutting intensities of 30 % and 40 % in 6 years, but the annual growth rate of DBH in plots with the cutting intensity of 40 % increased significantly. The annual growth rates of stand DBH and volume in plots with the cutting intensity above 30 % were relative high with maximum value of 2.6 % and 8.7 % respectively. The annual growth rates of stand DBH and volume were higher in plots carried out with 2-4 reasonable cuttings than that of plots with only one cutting or no cutting, and the annual growth rates of stand DBH and volume in 2009 reached to a maximum value of 3.6 % and 5.5 % respectively. The stand diameter class distribution in all the plots with the initial cutting changed from inverse J-shaped to asymmetric single or multi peak curve over the time. With reasonable cutting cycles (in about 8 years) and intensity (about 20 %), stands after 2-4 cuttings could keep a better diameter class structure. By fitted to a negative exponential model, the values of parameter K and a for all plots mainly presented a reduction trend over the time after selective cutting.

Key words: natural mixed spruce-fir forests, selective cutting, DBH, volume, diameter class structure, negative exponential model

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