Effects of close-to-nature transformation on structure characteristics 
of Pinus massoniana and Cunninghamia lanceolata plantations

doi:10.3969/j.issn.1000-2006.201606040

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2017, Vol. 41 ›› Issue (04): 101-107.doi: 10.3969/j.issn.1000-2006.201606040

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Effects of close-to-nature transformation on structure characteristics of Pinus massoniana and Cunninghamia lanceolata plantations

LIU Zhilong^1,2, MING Angang¹, JIA Hongyan^1*, CAI Daoxiong¹, MA Yue¹, WANG Yanan¹, SUN Dongjing¹

1. Experimental Center of Tropical Forestry, CAF, Pingxiang 532600,China;
2. Guangxi Youyiguan Forest Ecosystem Research Station, Pingxiang 532600,China

Online:2017-08-18 Published:2017-08-18

Abstract

Abstract: 【Objective】The close-to-nature transformation changes the forest composition and stand structure and thus, affects the tree growth and stand stability. Therefore, a study on the effects of close-to-nature transformation on stand structure has important significance in improving the quality of degrading plantations and producing large-diameter timber. 【Method】This study focused on Pinus massoniana and Cunninghamia lanceolata plantations, afforested in 1993 and close-to-nature transformated in 2008. Three parameters(mingling, uniform angle index, and neighborhood comparison)were considered to compare the changes in stand spatial structure before and after close-to-nature transformation. 【Results】① The diameter of control stands followed normal distribution, while the close-to-nature transformation stands showed the reversal “J” type. The tree height of control stands was a single peak type, whereas that of close-to-nature transformation plantations showed a double peak. ② The close-to-nature transformation improved stand mingling significantly, the average mingling increased from 0.00 and 0.16 to 0.82 and 0.89 in the P. massoniana and C. lanceolata control stands and their close-to-nature stands respectively. ③ Close-to-nature transformation has little effect on the uniform angle index, it changed from uniform distribution to reunion distribution in C. lanceolata stands; however, it has been in a random distribution state in P. massoniana stands. ④ The number of dominant and sub-dominant individuals were increased after close-to-nature transformation. The average neighborhood comparison of P. massoniana and C. lanceolata close-to-nature stands was 0.40 and 0.46 respectively, whereas there were generally medium individuals in the control stands. 【Conclusion】 In the perspective of non-spatial structure, close-to-nature transformation improves the composition of forest species, and the diameter of trees is transferred to an inverted “J” type as uneven aged forest. In terms of the stand spatial structure, the characteristic of artificial pure forests which were zero or less mixed with uniformly and evenly distributed tree species has been weakened by the transformation. In the close-to-nature forests, interplanted and natural regenerated species are growing well to increase the stand mingling, biodiversity, and optimize the forest spatial structure, where could become different-aged multilayer compound forests.

CLC Number:

S725

LIU Zhilong, MING Angang, JIA Hongyan, CAI Daoxiong, MA Yue, WANG Yanan, SUN Dongjing. Effects of close-to-nature transformation on structure characteristics of Pinus massoniana and Cunninghamia lanceolata plantations[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2017, 41(04): 101-107.

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Effects of close-to-nature transformation on structure characteristics of Pinus massoniana and Cunninghamia lanceolata plantations

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