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| Growth process of soil and water conservation forest and dynamic change of its carbon intensity |
| Zhang Jianjun， Xu Jiajia， Li Huimin |
| College of Soil and Water Conservation, Beijing Forestry University, 100083, Beijing, China |
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Abstract Robinia pseudoacacia is one of the main tree species to conserve soil and water in China. There are large areas of Robinia pseudoacacia forests for soil and water conservation in the Loess Plateau. The growth and the dynamics of carbon storage of these plantations are the key to evaluate the ecosystem service function of soil and water conservation forests in this region. In this paper, taken the Robinia pseudoacacia forests for soil and water conservation constructed in Maliantan as object, simple investigation and stem analysis were employed to study its growth process. Height-age Models, Diameter at breast height (DBH) Increment Model and the relationship of biomass and DBH were determined. The growth process and the dynamic change of carbon intensity were simulated based on these models. The results showed that the tree height and DBH of Robinia pseudoacacia grew very fast during the first 12 years, and the average growth rate of tree height and DBH was 0.63m/a and 0.53cm/a, respectively. At the age of 20 year, the current annual increment of biomass of Robinia pseudoacacia forests reached the maximum, 2.99t/hm2. At the age of 35 year, the current annual increment curve intersects the average increment curve of biomass of Robinia pseudoacacia forest, which means the mature forest, and total biomass and the carbon density were 72.79 and 35.52t/hm2, respectively.
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Received: 21 September 2011
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