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Citation:

Biomass, Carbon Storage and Distribution Patterns of Fallen Trees in Mid-subtropical Forests

  • Received Date: 2015-09-29
  • [Objective] The study aims at investigating the biomass, carbon storage and the quantity distribution of fallen tree within different forest types or stands in Jiangxi Province of mid-subtropics.[Method] The field survey was carried out, the central diameter and length were measured, and the decay class and species composition of fallen tree (diameter ≧1 cm,length ≧1 m) within 133 plots in subtropical typical forests were recorded.[Result] The biomass and carbon storage in Cunninghamia lanceolata forests were 0.684 t·hm-2 and 0.279 tc·hm-2, while that in Pinus massoniana forests were 0.553 t·hm-2 and 0.207 tc·hm-2. However, the biomass and carbon storage in evergreen broadleaf forests were 1.248 t·hm-2 and 0.521 tc·hm-2, and in secondary evergreen broadleaf forests were 1.888 t·hm-2 and 0.812 tc·hm-2. The biomass and carbon storage in P. massoniana-broadleaf mixed forests were 1.248 t·hm-2 and 0.521 tc·hm-2, while in C. lanceolata-broadleaf forests were 1.280 t·hm-2 and 0.432 tc·hm-2; the fallen tree biomass of diameter classⅡand Ⅲ were relatively larger than the others, which were significantly different from other diameter class in coniferous forests, there were significant differences between fallen tree biomass of diameter Ⅱ andⅠ, Ⅲ in coniferous-broadleaf mixed forests, while the fallen tree biomass of diameter class Ⅰwas significantly different fromⅡ, Ⅲ, Ⅳ and Ⅴ. The moderate decays of fallen tree of C. lanceolata and P. massoniana were at 0.332 t·hm-2 and 0.321 t·hm-2, which was higher than those in mild and severe decay of fallen tree. The decay of fallen tree in evergreen broadleaf forest was similar to C. lanceolata and P. massoniana.[Conclusion] These indicated that the biomass of fallen tree within different coniferous and evergreen broadleaf forests was significantly varied, while no significant difference was found with different coniferous-broadleaf forests in mid-subtropics. The carbon storage of fallen tree within different coniferous, evergreen broadleaf and coniferous-broadleaf forests were significantly different. The fallen trees in Jiangxi mainly dominated by diameter classⅡ(5~10 cm) and Ⅲ (10~15 cm), and most were in moderate decay. The fallen tree of coniferous-broadleaf forests was primary distributed below 700 m a.s.l, while the fallen tree of evergreen broadleaf forests was mainly distributed above 650 m a.s.l. The results suggested that the fallen tree may play a key role in mitigating global warming and carbon cycles because of the larger amount of biomass and carbon storage in evergreen broadleaf forests. It is necessary to pay more attention to the influence of fallen tree on sustainable development of forests in the future's operation and management.
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Biomass, Carbon Storage and Distribution Patterns of Fallen Trees in Mid-subtropical Forests

  • 1. College of Forestry, Jiangxi Agricultural University, Nanchang 330045, Jiangxi, China
  • 2. Earth and Environmental Science Department, University of British Columbia, Okanagan, Canada
  • 3. South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510520, Guangdong, China

Abstract: [Objective] The study aims at investigating the biomass, carbon storage and the quantity distribution of fallen tree within different forest types or stands in Jiangxi Province of mid-subtropics.[Method] The field survey was carried out, the central diameter and length were measured, and the decay class and species composition of fallen tree (diameter ≧1 cm,length ≧1 m) within 133 plots in subtropical typical forests were recorded.[Result] The biomass and carbon storage in Cunninghamia lanceolata forests were 0.684 t·hm-2 and 0.279 tc·hm-2, while that in Pinus massoniana forests were 0.553 t·hm-2 and 0.207 tc·hm-2. However, the biomass and carbon storage in evergreen broadleaf forests were 1.248 t·hm-2 and 0.521 tc·hm-2, and in secondary evergreen broadleaf forests were 1.888 t·hm-2 and 0.812 tc·hm-2. The biomass and carbon storage in P. massoniana-broadleaf mixed forests were 1.248 t·hm-2 and 0.521 tc·hm-2, while in C. lanceolata-broadleaf forests were 1.280 t·hm-2 and 0.432 tc·hm-2; the fallen tree biomass of diameter classⅡand Ⅲ were relatively larger than the others, which were significantly different from other diameter class in coniferous forests, there were significant differences between fallen tree biomass of diameter Ⅱ andⅠ, Ⅲ in coniferous-broadleaf mixed forests, while the fallen tree biomass of diameter class Ⅰwas significantly different fromⅡ, Ⅲ, Ⅳ and Ⅴ. The moderate decays of fallen tree of C. lanceolata and P. massoniana were at 0.332 t·hm-2 and 0.321 t·hm-2, which was higher than those in mild and severe decay of fallen tree. The decay of fallen tree in evergreen broadleaf forest was similar to C. lanceolata and P. massoniana.[Conclusion] These indicated that the biomass of fallen tree within different coniferous and evergreen broadleaf forests was significantly varied, while no significant difference was found with different coniferous-broadleaf forests in mid-subtropics. The carbon storage of fallen tree within different coniferous, evergreen broadleaf and coniferous-broadleaf forests were significantly different. The fallen trees in Jiangxi mainly dominated by diameter classⅡ(5~10 cm) and Ⅲ (10~15 cm), and most were in moderate decay. The fallen tree of coniferous-broadleaf forests was primary distributed below 700 m a.s.l, while the fallen tree of evergreen broadleaf forests was mainly distributed above 650 m a.s.l. The results suggested that the fallen tree may play a key role in mitigating global warming and carbon cycles because of the larger amount of biomass and carbon storage in evergreen broadleaf forests. It is necessary to pay more attention to the influence of fallen tree on sustainable development of forests in the future's operation and management.

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