摘要
根据近年作者及相关研究成果,提出一般茶园(非F污染区,非高F地质背景区)生态系统F的生物地球化学循环模型,估算茶园生态系统各子系统F的库容和库之间的F流量,分析茶园生态系统F的生物地球化学特征.结果表明:1)茶园生态系统F的惰性库∶调节库∶活动库为239∶4∶1,活动库占总库容的比例高达0.41%,其比例是非常高的;2)该生态系统F的外循环是一个正平衡循环,F的收入与支出比为2∶1,同时地表径流的F支出大于地下径流的F支出;3)由于茶树具有很强的从土壤摄取F的能力,摄取的F绝大部分(98%)汇集于叶上,特别是老叶上,且部分易被雨水淋出,因而通过透冠流和枯枝落叶形成很大的F流量,分别达10.5 kg.hm-2.a-1和8.5 kg.hm-2.a-1,内循环流量达19.95kg.hm-2.a-1,为活动库库容的3.6倍,使活动库具有很高的更新速率;4)茶园生态系统F的生物地球化学循环伴随着系统中F的活化、有机化和生物积累过程.
Based on the data from recent researches, a model on the biogeochemical cycle of F in tea garden ecosystem was conceptualized, and the capacity of F pools, the flows of F between the components and characteristics of the ecosystem were analyzed. Results indicated： 1 ） The capacity proportions of the inert pool, regulate pool and active pool of F in the ecosystem are 239 ：4 ： 1. The active pool occupies a great proportion of 0. 41% in total F of the system; 2） The outside cycle of F shows a positive balance, the proportion of receipts to expenditures of F amounts to 2 ： 1, and the expenditure of F is more through surface water than through groundwater; 3 ） There is a strong inner cycle of F （19.95 kg. hm-2 .a-1） in the tea garden ecosystem, because F is absorbed largely from soil by tea plant （18.62 kg .hm-2 . a-1） and stored mainly in the leaves （98%）, especially in old leaves, but largely returns to soil by leaching rainwater （ 10. 49 kg . hm-2 . a-1 ） , and by dead branches and leaves （8.54 kg . hm -2 . a-1 ） , the amount of F in inner cycle capacity of active pool, leading equals to a fast replacement rate of F in the chemical cycle of F is accompanied by processes such as F activation, compound form and F biological accumulation in tea garden ecosystem. 3.6 times as much as the F- active pool; 4） The biogeo- F transformation into organic
出处
《亚热带资源与环境学报》
2011年第3期1-8,共8页
Journal of Subtropical Resources and Environment
基金
国家自然科学基金(No.41001064)
