摘要
利用气相色谱仪 (GC)对樟树林生态系统中植物体各器官和林地土壤的多环芳烃 (PAHs)进行定性和定量测定。结果表明 :乔木层樟树各器官中树皮的PAHs含量最高 ,为 86 4 1μg·kg- 1 ;树干最低 ,为 2 84 3μg·kg- 1 ;其他依次为籽实 (75 2 0 μg·kg- 1 ) >树根 (7115 μg·kg- 1 ) >树枝 (5 35 2 μg·kg- 1 ) >树叶 (4 4 81μg·kg- 1 )。樟树林生态系统中PAHs含量空间分布为 :枯枝落叶层 (92 35 μg·kg- 1 ) >乔木层 (5 995 μg·kg- 1 ) >草本层 (36 31μg·kg- 1 ) >土壤层(14 6 6 μg·kg- 1 ) >灌木层 (2 4 5 μg·kg- 1 )。与无林地土壤的PAHs含量 (3470 μg·kg- 1 )相比 ,樟树林土壤的PAHs含量低 5 0 %以上。同时 ,随大气降水进入樟树林的PAHs,经过林木的吸附和降解后 ,林内降水和地表径流的PAHs种类和含量明显减少 ,说明樟树林生态系统对PAHs具有吸附和降解作用。
This study investigated the categories and concentrations of PAHs in the plants and soil of a Cinnamomum camphora stand at the suburb of Zhuzhou City, Hunan Province, using GC instrument. The concentrations of PAHs in different organs of overstorey trees in the C. camphora stand could be ranked in the following order: bark (8 641 μg·kg -1) >fruit (7 520 μg·kg -1) >root (7 115 μg·kg -1) >branch (5 352 μg·kg -1) >leaf (4 481 μg·g -1) >stem (2 843 μg·g -1). In the whole C. camphora stand, the concentration of PAHs was 9 235 μg·kg -1 for litter, 5 995 μg·kg -1 for overstorey trees, 3 631 μg·kg -1 for understorey herbal plants, 1 466 μg·kg -1 for soil and 245 μg·kg -1 for understorey shrubs plants. The PAHs concentration in the soil of the C. camphora stand decreased by over 50 in contrast to that in the soil of a bare land. At the same time, the PAHs concentration in the throughfall and surface runoff was lower than that in the precipitation due to absorption and degradation of the C. camphora stand. The results that C. camphora stand had the functions of absorption and degradation of PAHs could provide a scientific basis for urban forest construction and environmental protection.
出处
《林业科学》
EI
CAS
CSCD
北大核心
2004年第6期2-7,共6页
Scientia Silvae Sinicae
基金
国家自然基金资助项目 ( 3 0 2 710 43 )
国家科技部平台建设项目 ( 2 0 0 2 12 2 0 )
国家重点野外台站项目 ( 2 0 0 0 -0 76)
国家林业局重点科研项目 ( 2 0 0 1-0 7)资助