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| Biomass carbon stocks and dynamics of forests in Heilongjiang Province from 1973 to 2013 |
| ZHANG Chun-hua1,2, WANG Li-yuan1, SONG Qian-wei1, CHEN Xiao-feng3, GAO Hui1, WANG Xi-qun4 |
1. School of Resources and Environmental Engineering, Ludong University, Yantai 264025, China;
2. International Institute for Earth System Science, Nanjing University, Nanjing 210023, China;
3. Beijing Key Laboratory of Precision Forestry, Beijing Forestry University, Beijing 100083, China;
4. Planning and Design Institute of Forest Products Industry, State Forestry Administration of China, Beijing 100010, China |
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Abstract Based on the data from eight consecutive provincial forest inventories for the period of 1973~2013, and the updated biomass-volume relationship retrieved from field measurements, the dynamics of forest biomass carbon stocks were systematically analyzed using the newly refined continuous biomass expansion factor model in Heilongjiang Province over the past four decades. The results showed that the provincial total biomass carbon stocks decreased from 1159.35 to 833.99 TgC between 1973~1976 and 2009~2013. Natural forests completely contributed to such stock reduction of 387.51TgC, while planted forests increased by 62.15TgC. Forests functioned as a biomass carbon source of -10.88TgC/a, primarily caused by the decrease in the area for natural forests. Different types of forests exhibited substantial temporal variations of the biomass carbon stocks. Betula, Larix, and mixed coniferous and broadleaf forests were the major contributors to the total biomass carbon stocks. The biomass carbon density for most types of forests increased from 1973 to 2013. Currently, forests were dominantly young and middle-aged forest stands in Heilongjiang. Middle-aged forests had the largest proportion ranging from 27.9% to 46.6% of the total biomass carbon stocks during 1973~2013. The biomass carbon stocks decreased in all forest age groups but middle-aged forests, with the largest decrease of 201.17 TgC for mature forests. The biomass carbon density for young, middle-aged and premature forests significantly increased by 2.20, 3.21 and 3.43 MgC/hm2 during the entire study period, respectively. However, the biomass carbon density for mature and overmature forests showed a downward trend. The dynamics of biomass carbon stocks for different age groups were mainly driven by the changes in forest area and biomass carbon density.
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Received: 23 May 2018
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