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cje ›› 2012, Vol. 31 ›› Issue (07): 1626-1632.

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Biomass and carbon density of main forest ecosystems in Hubei Province.

HU Qing1,2,3, WANG Si-long1,2**, CHEN Long-chi1,2, ZHANG Wei-dong1,2, GONG Chao3   

  1. (1Huitong Experimental Station of Forest Ecology, Chinese Academy of Sciences, Shenyang 110016, China; 2 State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110164, China; 3Graduate University of Chinese Academy of Sciences, Beijing 100049, China)
  • Online:2012-07-10 Published:2012-07-10

Abstract: Based on the field investigation data, this paper analyzed the carbon storage and carbon density in the secondary forests under closing hillsides to facilitate afforestation, secondary forests, and plantation forests in Hubei Province. The mean carbon storage of the tree layers in the secondary forests under closing hillsides to facilitate afforestation, secondary forests, and plantation forests was 133.87, 73.42 and 111.62 t·hm-2, the mean carbon storage of shrub layers was 1.65, 1.40 and 1.52 t·hm-2, the mean carbon storage of herb layers was 0.13, 0.09 and 0.13 t·hm-2, and the mean carbon storage of litter layers was 0.47, 1.34 and 0.93t·hm-2, respectively. With the largest share in trunk, the carbon stored in tree layers was the main contributor to the ecosystem C storage, accounting for 98.35%, 96.29% and 97.74% of the total biomass C in the secondary forests under closing hillsides to facilitate afforestation, secondary forests, and plantation forests, while the carbon storage in understory vegetation (shrub + herb) and litters had the least share, accounting for 1.31%, 1.95%, 1.44% and 0.34%, 1.76% and 0.82%, respectively. The soil carbon storage decreased with depth, and 60% of the total was accumulated in 0-40 cm layer. The carbon density in 0-100 cm soil of the secondary forests under closing hillsides to facilitate afforestation, secondary forests, and plantation forests was averagely 57.04, 66.92 and 54.12 t·hm-2, respectively, and also decreased with increasing depth. The biomass and the soil carbon storage were larger in the secondary forests under closing hillsides to facilitate afforestation and the secondary forests than in the plantation forests, and the carbon density was in the order of soil (0-100 cm) > tree layer > shrub layer > herb layer > litter layer, indicating that secondary forests under closing hillsides to facilitate afforestation was more helpful to improve forest carbon sink, and the implement of near-nature forest management would be the main approach in promoting the carbon sequestration capacity of forest ecosystems in this region.

Key words: cotton, key time window, high temperature stress, fiber quality.