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Forests 2016, 7(8), 177; doi:10.3390/f7080177

Diameter Growth, Biological Rotation Age and Biomass of Chinese Fir in Burning and Clearing Site Preparations in Subtropical China

Forestry College, Beijing Forestry University, No. 35 Tsinghua East Road Haidian District, Beijing 100083, China
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Author to whom correspondence should be addressed.
Academic Editors: Jesus Julio Camarero, Raúl Sánchez-Salguero and Juan Carlos Linares
Received: 9 July 2016 / Revised: 5 August 2016 / Accepted: 11 August 2016 / Published: 18 August 2016
(This article belongs to the Special Issue Forest Growth Response to Environmental Stress)
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Abstract

Sustained forest management of Cunninghamia lanceolata (Chinese fir) plantations in subtropical China is restricted by the limited availability of quantitative data. This study combines inventory data and tree-ring analysis of Chinese fir from natural and plantation forests that were subjected to controlled burning or brush clearing site preparations. Inter-annual variation of Chinese fir tree-ring widths were measured for the controlled burning, brush clearing and natural forest sites. The mean annual diametric growth of Chinese fir was 0.56 cm·year−1 for the natural forest, 0.80 cm·year−1 for the brush clearing site and 1.10 cm·year−1 for the controlled burning site. The time needed to reach the minimum cutting/logging diameter of 15 cm was 14 years in the controlled burning site, 19 years in the brush clearing site and >40 years in the natural forest. The biological rotation ages for the burning, cutting and natural forest sites were 15, 26 and >100 years, respectively. The total aboveground biomasses for the burning and clearing sites were 269.8 t·ha−1 and 252 t·ha−1, respectively. These results suggest that the current 25-year cutting cycle greatly underestimates the growth rate of Chinese fir plantations. View Full-Text
Keywords: biomass; Chinese fir; rotation age; site preparation; subtropical forests biomass; Chinese fir; rotation age; site preparation; subtropical forests
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Zhou, H.; Meng, S.; Liu, Q. Diameter Growth, Biological Rotation Age and Biomass of Chinese Fir in Burning and Clearing Site Preparations in Subtropical China. Forests 2016, 7, 177.

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