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火烧迹地不同恢复方式土壤有机碳分布特征

李红运,辛颖,赵雨森*   

  1. (东北林业大学林学院, 哈尔滨 150040)
  • 出版日期:2016-09-18

Distribution characteristics of soil organic carbon of burned area under different restorations.

LI Hong-yun, XIN Ying, ZHAO Yu-sen*   

  1. (School of Forestry, Northeast Forestry University, Harbin 150040, China).
  • Online:2016-09-18

摘要: 以大兴安岭1987年重度火烧后恢复的兴安落叶松人工林、樟子松人工林、人促杨桦林和天然次生杨桦林为对象,研究不同恢复方式林分土壤有机碳、土壤可溶性有机碳和土壤微生物生物量碳的分布特征.结果表明: 4种恢复方式林分的土壤有机碳、土壤可溶性有机碳和土壤微生物生物量碳分别为9.63~79.72 g·kg-1、33.21~186.30 mg·kg-1和200.85~1755.63 mg·kg-1,且随土层深度增加而降低.不同恢复方式间土壤有机碳、土壤可溶性有机碳和土壤微生物生物量碳差异显著,以人促杨桦林最高,兴安落叶松人工林和天然次生杨桦林次之,樟子松人工林最低.各恢复方式林分的土壤微生物熵为1.1%~2.3%,以人促杨桦林最高,樟子松人工林最低,不同林分土壤微生物熵的垂直分布特征不同.土壤微生物生物量碳与土壤有机碳、土壤可溶性有机碳含量均呈显著正相关.人促杨桦林土壤有机碳活性高于其他林分,火烧迹地采用人工促进天然恢复的方式较人工恢复和天然恢复的土壤碳循环能力更强.

关键词: 火烧迹地, 土壤有机碳, 土壤微生物生物量碳, 土壤可溶性有机碳

Abstract: 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-1, from 33.21 to 186.30 mg·kg-1 and from 200.85 to 1755.63 mg·kg-1, 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 varied 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.

Key words: burned area, soil dissolved organic carbon., soil organic carbon, soil microbial biomass carbon