生态环境学报2018，Vol.27Issue(2)：224-231,8.DOI:10.16258/j.cnki.1674-5906.2018.02.004
亚热带地区不同人工林配置下土壤微生物量碳及微生物墒的年际动态
Interannual Dynamics of Soil Microbial Biomass Carbon under Different Plantations in Subtropical China
摘要
Abstract
The interannual dynamics of soil microbial biomass carbon were investigated under five different plantations including Acacia crassicarpa monoculture,Castanopsis hystrix monoculture,Eucalyptus urophylla monoculture,10-species mixed plantation and 30-species mixed plantation at their ages of 1-year, 6-year and 11-year-old in subtropical China. The naturally recovered shrub land was used as a reference for the five different plantations. The results showed that the soil microbial biomass carbon (MBC) increased at the early developmental stages of the plantations but decreased at 11-year-old except for Eucalyptus urophylla monoculture and had no siginificant different. The peak value of MBC occurred at the age of 6-year-old with the highest of 255.81 mg·kg-1for Acacia crassicarpa monoculture.There were differences of MBC among different plantations at the same age,and the most significant differences were detected at the age of 11-year-old (P=0.001). The MBC under both mixed species plantations were the highest,followed by monocultural plantations of Acacia crassicarpa and Castanopsis hystrix,and the lowest MBC occurred at Eucalyptus urophylla monocultural plantation and a naturally recovered shrub land. The temporal change patterns of soil organic carbon (SOC) and total nitrogen (TN) were consistent with that of MBC, i.e. the peak value occurred at 6-year-old. The differences in contributions of MBC to SOC among different plantations showed similar pattern to that of MBC, but this varied with plantation age. Spearman correlations analysis showed positive correlations between MBC and SOC, TN, but negative correlation was detected between the ratio of MBC to SOC and SOC. In conclusion, the interannual change of MBC under different plantations may be related to the instability of early developmental stages of plantations because the vegetation has not yet reached the level of maturity. Our results can provide useful data and theoretical basis for the ecological restoration and management of degraded hilly land in subtropical China.关键词
土壤微生物量碳/林龄/年际动态Key words
soil microbial biomass/forest age/temporal change分类
农业科技引用本文复制引用
易桂田,王晓丽,刘占锋,蔡锡安,傅声雷,周丽霞..亚热带地区不同人工林配置下土壤微生物量碳及微生物墒的年际动态[J].生态环境学报,2018,27(2):224-231,8.基金项目
国家重点研发计划项目(2017YFC0505403-04) （2017YFC0505403-04）
国家自然科学基金项目(31210103920) （31210103920）
广东省自然科学基金项目(2017A030313128) （2017A030313128）
