关键词: 资源枯竭型城市, 经济转型, 棚户区改造, 城市用地, SLEUTH模型, 模拟

Abstract: This paper measured the carbon density of the sawtooth oak (Quercus acutissima Carr.) plantations in Hongyashan Forestry Farm of Chuzhou City, Anhui Province of East China under different fertilization treatments (0, 0.15, 0.30, and 0.45 kg·tree-1), and determined the soil respiration components in dormant period by the method of trenching for separation. In the treatments 0, 0.15, 0.30, and 0.45 kg·tree-1, the total carbon density of the stands was 73.68, 84.49, 87.20, and 91.70 t·hm-2, respectively. As compared with t〖JP2〗reatment 0 kg·tree-1, the carbon densities of the stem, branch, and litter in the other three fertilization treatments increased significantly (P<0.01). The soil total and heterotrophic respiration rates increased with increasing fertilization rate, being 48.9% and 38.6% higher in treatment 0.45 kg·tree-1 than in treatment 0 kg·tree-1, respectively. Compared with root respiration, soil heterotrophic respiration had a far greater contribution to the soil total respiration. In the treatments 0, 0.15, 0.30, and 045 kg·tree-1, the contribution rate of soil heterotrophic respiration was 50, 38, 34, and 32 times of that of root respiration, respectively. The soil respiration was controlled by both abiltic and biotic factors, among which, soil moisture content and litter carbon content correlated significantly to the soil total respiration and heterotrophic respiration (P<005).

Key words: resource-exhausted city, economic transformation, renovating shantytowns, urban land, SLEUTH model, simulation.