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研究论文

摘要：建立了酸沉降—冠层反应模型,并计算冠层穿落水的化学特征。用广西马尾松和火力楠人工林一周年观测数据对模型进行初步检验.结果表明,模型与观测结果基本吻合,实测和模拟的穿落水量及各项离子的相对误差都在±7％之内,马尾松冠层过程强烈地受大气干沉降控制,穿落水加权pH值比同期降雨低0.61单位,火力楠受干沉降影响小,穿落水pH比降雨高0.28.参与冠层反应的各离子的主要来源不尽相同.

Abstract：A model of forest canopy reaction to acid precipitation was suggested to simulate the throughfall chemistry. Canopy reactions of Pinus massoniana and Michelia macclurei Var. sublanea in Liuzhou,Guangxi were measured during oneyear perjod. The result validated the accuracy of the model. The relative errors were less than 7% in simulated throughfall and ion fluxes compared to the field data. Ion concentrations in simulated throughfall matched measured ones. Dry deposition was the major source of acid substances in the studied area. Coniferous canopy process seemed to be dominated by dry deposition, while deciduous process was affected less by that. The weighted pH of coniferous throughfall was 0.61 less, and the pH of deciduous throughfall was 0.28 unit greater than that of synchronous rain. The main source of ions participated the canopy process appears to vary.