Li Hong Yun, Xin Ying, Zhao Yu Sen
School of Forestry, Northeast Forestry University, Harbin 150040, China.
Ying Yong Sheng Tai Xue Bao. 2016 Sep;27(9):2747-2753. doi: 10.13287/j.1001-9332.201609.036.
The distribution characteristics of soil organic carbon (SOC), soil dissolved organic carbon (DOC) and soil microbial biomass carbon (MBC) under different restorations were studied in Larix gmelinii plantation, Pinus sylvestris var. mongolica plantation, artificial promotion poplar-birch forest and the natural secondary poplar-birch forest restored from burned area after the severe fire of Greater Xing' an Mountains in 1987. The results showed that the variations in SOC, DOC and MBC ranged from 9.63 to 79.72 g·kg, from 33.21 to 186.30 mg·kg and from 200.85 to 1755.63 mg·kg, respectively, which decreased with soil depth increasing. There was significant diffe-rence in SOC, DOC and MBC among different restorations, with the maximum carbon contents for artificial promotion poplar-birch forest, followed by L. gmelinii plantation, natural secondary poplar-birch forest and P. sylvestris var. mongolica plantation successively. The soil microbial quotient va-ried from 1.1% under P. sylvestris var. mongolica plantation to 2.3% under artificial promotion poplar-birch forest, and its vertical distributions were different in the four restoration forests. Correlation analysis indicated that MBC had a significant positive correlation with SOC and DOC, respectively. The activity of soil organic carbon in artificial promotion poplar-birch forest was higher than in other forest stands, suggesting a stronger capacity of the soil carbon cycle through natural regeneration with artificial promotion on burned area in Greater Xing'an Mountains.
对1987年大兴安岭特大火灾后火烧迹地恢复形成的兴安落叶松人工林、樟子松人工林、人工促进杨桦林和天然次生杨桦林不同恢复类型下土壤有机碳（SOC）、土壤溶解性有机碳（DOC）和土壤微生物量碳（MBC）的分布特征进行了研究。结果表明，SOC、DOC和MBC的变化范围分别为9.63～79.72 g·kg、33.21～186.30 mg·kg和200.85～1755.63 mg·kg，均随土壤深度增加而降低。不同恢复类型间SOC、DOC和MBC存在显著差异，人工促进杨桦林的碳含量最高，其次依次为兴安落叶松人工林、天然次生杨桦林和樟子松人工林。土壤微生物商在樟子松人工林为1.1%，在人工促进杨桦林为2.3%，在4种恢复林中其垂直分布不同。相关性分析表明，MBC分别与SOC和DOC呈显著正相关。人工促进杨桦林土壤有机碳活性高于其他林分，表明大兴安岭火烧迹地人工促进天然更新下土壤碳循环能力更强。
