酸沉降下韶山森林DOC时空分布及环境影响因子研究

于2003年1月-2003年12月对酸沉降影响下韶山4个典型样地进行了林内降雨DOC的监测,并以此分析研究了韶山森林在酸沉降作用下DOC浓度、通量变化特征及环境影响因子,结果表明:韶山森林冠层穿透水、亚冠层穿透水以及枯枝落叶层淋滤液中DOC月均浓度分别为8.52 mg C/L,10.43 mg C/L和23.38 mg C/L,最大值均出现在8月;冠层穿透水和枯枝落叶层淋滤液中DOC浓度随着海拔高度的增加而增加,而亚冠层穿透水DOC浓度受海拔高度的影响较小;环境因子对DOC浓度分布有一定的影响,但降雨酸度对其影响不明显;冠层、亚冠层和枯枝落叶层中DOC通量月变化范围分别为81.37 ～808.18 mg/m2,97.04 ～398.73 mg/m2和329.31～2 789.1 mg/m2.从全年来看,枯枝落叶层淋滤液中DOC通量均为最大,表明韶山森林DOC的积累主要出现在枯枝落叶层.

Study on the Space-time Distribution of DOC and Environmental Effect Factors under Acid Deposition in Shaoshan Forests

From January to December 2003, a total of four standard sampling plots in Shaoshan forest were chosen, and the concentrations, fluxes and environmental factors of DOC in forest inner rainwater were studied. The study results showed that the average month concentrations of DOC in canopy, sub-canopy and litterfall layer were 8.52 mg C/L, 10.43 mg C/Land 23.38 mg C/L respectively, and the maximal value was almost presented in August. The concentrations of DOC in canopy throughfall and litterfall leaching increased with the rise of altitude, but less influence for sub-canopy throughfall. There were some relations between environmental factors and the concentration distribution of DOC, but no evident influence by bulk precipitation acidity. Monthly ranges of DOC fluxes was 81.37 mg/m~2 to 808.18 mg/m~2,97.04 mg/m~2 to 398.73 mg/m~2 and 329.31 mg/m~2 to 2 789.1 mg/m~2 for canopy, sub-canopy and litterfall layer, respectively, and the accumulation of DOC mainly occurred in the litterfall layer of Shaoshan forests.