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Scientia Silvae Sinicae ›› 2014, Vol. 50 ›› Issue (12): 14-23.doi: 10.11707/j.1001-7488.20141203

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Energy Production Characteristics of Chinese Fir Plantations at Different Growth Stages

Zhang Gui1, Kang Wenxing1,2,3, He Jienan1, Wang Dong1, Yao Lihui1   

  1. 1. Central South University of Forestry and Technology Changsha 410004;
    2. National Engineering Laboratory for Applied Technology of Forestry & Ecology in South China Changsha 410004;
    3. National Field Station for Scientific Observation & Experiment in Huitong Huitong 418307
  • Received:2013-08-04 Revised:2014-11-05 Online:2014-12-25 Published:2015-01-08

Abstract:

Based on continuously measured biomass and calorific values of Chinese fir (Cunninghamia lanceolata) plantations in a national key scientific experimental station in Huitong, the energy productivity and energy storage and distribution in different components in a Chinese fir plantation at different ages were studied. The results showed that the calorific values of the stand components in Chinese fir plantations at the same age were ranked as tree layer > shrub layer > herb layer > litter layer. The different organs of C. lanceolata had different calorific values ranked as needle > bark > twig > trunk > root, and the calorific values of organs increased with the age. The energy storage in Chinese fir plantations in Huitong ranged from 8 340.1×108 to 33 318.3×108J ·hm-2. The order of proportion of energy storage in different plantation layers was as follows: tree layer (99.35%-99.62%) > understory vegetation layer (0.26%-0.53%) > litter layer (0.12%-0.19%). In the tree layer, energy was allocated mainly in the stem, followed by root, leaf, bark and twigs. The trunk energy distribution ratio increased with stand age, whereas the branches' and leaves' decreased over time, the roots' and barks' maintained relatively stable. The changes in, the average annual accumulation of the needle, twig ,trunk, bark, and root energy all showed a single peak-shaped curve, but the peaks occurred at different ages. The average annual energy productivity was 1 200.4 × 108-2 086.2 × 108J ·hm-2a-1, among which the tree layer produced 93.84% to 98.60%, understory vegetation layer produced only 0.53% to 2.46%, and the litter energy accounted for only 0.87% to 3.70%. Accordingly, the energy production of the dynamic characteristics can be divided into five stages: the energy production establishment, the energy production rapid rate increase, the largest energy productivity, the stable energy productivity, the decline energy productivity. Therefore, the Chinese fir forest energy production is mainly affected by the biological characteristics of Chinese fir at different growth stages of growth and development rhythm.

Key words: calorific values, energy, energy productivity, Chinese fir plantation, Huitong

CLC Number: