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应用生态学报 ›› 2012, Vol. 23 ›› Issue (09): 2325-2331.

• 研究报告 • 上一篇    下一篇

油松辽东栎混交林地表凋落物与氮添加对土壤微生物生物量碳、氮及其活性的影响

涂玉1,尤业明1,孙建新1,2**   

  1. (1北京林业大学森林培育与保护教育部重点实验室, 北京 100083; 2北京林业大学林业应对气候变化研究所, 北京 100083)
  • 出版日期:2012-09-18 发布日期:2012-09-18

Effects of forest floor litter and nitrogen addition on soil microbial biomass C and N and microbial activity in a mixed Pinus tabulaeformis and Quercus liaotungensis forest stand in Shanxi Province of China.

TU Yu1, YOU Ye-ming1, SUN Jian-xin1,2   

  1. (1Ministry of Education Key Laboratory for Silviculture and Conservation, Beijing Forestry University, Beijing 100083, China; 2Institute of Forestry and Climate Change Research, Beijing Forestry University, Beijing 100083, China)
  • Online:2012-09-18 Published:2012-09-18

摘要: 2010年9月—2011年10月,在山西省灵空山油松和辽东栎混交林样地采取随机区组设计,研究了地表凋落物和氮添加处理对土壤微生物生物量碳、氮和微生物活性的影响.凋落物处理包括: 剔除凋落物(N)、叶凋落物加倍(L)、枝果凋落物加倍(B)和混合凋落物加倍(LB);氮添加量分别为0(N0)、5 g·m-2·a-1(N1)和10 g·m-2·a-1(N2).结果表明: 剔除地表凋落物且无氮添加时,油松和辽东栎混交林地的土壤有机碳(SOC)含量显著降低,其他试验处理间对SOC的影响无显著差异.土壤微生物生物量碳(MBC)、氮(MBN)及其活性(MR)的变化范围依次为: 262.42~873.16 mg·kg-1、73.55~173.85 mg·kg-1和2.38~3.68mg·kg-1·d-1.MBC、MBN和MR两两间呈极显著正相关.氮添加对MBC、MBN和MR均无显著影响;凋落物处理对MR影响显著,表现为混合凋落物加倍处理的MR最高,叶凋落物加倍处理次之,剔除凋落物处理最低,而对MBC和MBN无显著影响.凋落物和氮添加处理在整个试验过程中未表现出交互作用.短期的氮添加处理和森林地表凋落物变化对土壤微生物过程的影响有限.  

Abstract: From September 2010 to October 2011, a field experiment with randomized block design was conducted in a mixed Pinus tabulaeformis and Quercus liaotungensis forest stand in Lingkong Mountain of Shanxi Province to study the effects of forest floor litter and nitrogen addition on the soil microbial carbon (MBC) and nitrogen (MBN) and microbial activity (MR). The litter treatments included complete litter removal, doubling of leaf litter (L), doubling of woody litter (B), and doubling of mixed leaf and woody litter (LB), and the nitrogen addition rates were 0 (N0), 5 g·m-2·yr-1 (N1), and 10 g·m-2·yr-1 (N2). Except that the treatment of complete litter removal without nitrogen addition decreased the soil organic carbon content significantly, all the other treatments had no significant differences in the effects on soil organic carbon. The soil MBC, MBN, and MR varied in the ranges of 262.42-873.16 mg·kg-1, 73.55-173.85 mg·kg-1, and 2.38-3.68 mg·kg-1·d-1, respectively, and the MBC and MBN had significant positive correlations with the MR. Nitrogen addition did not show any effect on the MBC, MBN, and MR, whereas litter treatments affected the MR significantly, with the highest MR in treatment LB, followed by  treatments L and B, and the lowest in treatment of complete litter removal. There were no interactive effects between litter and nitrogen addition treatments on any of the variables studied. It was suggested that shortterm nitrogen addition and forest floor litter change could have limited effects on soil microbial processes.