DOI: 10.1016/j.foreco.2014.05.037
Scopus记录号: 2-s2.0-84902244642
论文题名: Soil microbial biomass carbon and nitrogen in pure and mixed stands of Pinus massoniana and Cinnamomum camphora differing in stand age
作者: Wen L. ; Lei P. ; Xiang W. ; Yan W. ; Liu S.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2014
卷: 328 起始页码: 150
结束页码: 158
语种: 英语
英文关键词: Cinnamomum camphora
; Mixed species plantation
; Pinus massoniana
; Soil microbial biomass
; Soil quality
; Stand age
Scopus关键词: Bacteria
; Biomass
; Carbon
; Microbiology
; Nitrogen
; Soil testing
; Soils
; Sustainable development
; Cinnamomum camphora
; Mixed species
; Pinus massoniana
; Soil microbial biomass
; Soil quality
; Stand age
; Forestry
; biomass
; forest ecosystem
; mixed forest
; monoculture
; soil depth
; soil microorganism
; species diversity
; stand structure
; Bacteria
; Biomass
; Carbon
; Forestry
; Microbiology
; Nitrogen
; Pinus Massoniana
; Plantations
; Soil
英文摘要: Converting monocultures into mixed forests has become a common trend of forest management in recent decades owing to enhancement of ecosystem functioning and sustainability due to complementary resource use, environmental benefits and improved soil properties in mixed forests. These positive admixing effects are expected to be more pronounced over time since the above- and below-ground interactions become more intense as forest grows. Although soil microbes play pivotal roles herein, the interrelationship between tree species composition and soil microorganisms is not well understood, especially in the context of varying forest age. In this study, we compared soil microbial biomass carbon (Cmic), microbial biomass nitrogen (Nmic), soil organic carbon (Corg), and total soil nitrogen (Ntot) in Pinus massoniana and Cinnamomum camphora mixed plantations at 10-yr, 24-yr and 45-yr old stands with their monospecific counterparts in the soil depth of 0-10. cm, 10-20. cm and 20-30. cm. The results showed admixtures created age-dependent strong positive effects on soil microbial biomass and carbon sequestration. Firstly, the concentrations of Corg, Ntot, Cmic and Nmic were highest in the Pinus - Cinnamomum mixed stands in the whole soil profile at all development stages. These positive admixing effects were non-additive in the 10 and 45. years old stands, while additive in 24. years old mixed stands. Secondly, although the fraction of microbial carbon or nitrogen (i.e., Cmic/Corg or Nmic/Ntot ratio) in soil decreased with stand age, the positive effects of admixture on soil microorganisms became more pronounced in terms of Cmic concentrations as forests grew. We also found the Cmic/Corg and Nmic/Ntot ratios increased with increasing soil depth, likely indicating increasing efficiency of microbes in soil carbon decomposition along the profile, which has not yet been captured by conventional process models. The sensitivity of microbial parameters to tree species composition, stand age, and soil depth revealed in this study not only sheds light on the interpretation of the higher soil quality in mixed than in pure species plantations using the dynamic admixing effects but also highlights the need of further research to improve model representation of the soil processes in deep profile. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65854
Appears in Collections: 影响、适应和脆弱性
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作者单位: Faculty of Life Science and Technology, Central South University of Forestry and Technology, Changsha 410004, Hunan, China; National Engineering Laboratory for Applied Technology of Forestry and Ecology in South China, Central South University of Forestry and Technology, Changsha 410004, Hunan, China
Recommended Citation:
Wen L.,Lei P.,Xiang W.,et al. Soil microbial biomass carbon and nitrogen in pure and mixed stands of Pinus massoniana and Cinnamomum camphora differing in stand age[J]. Forest Ecology and Management,2014-01-01,328