缺土的板寨原始森林区岩溶地下河系统的水—碳动态特征

利用水文水化学自动记录仪, 对缺土的板寨原始森林区岩溶地下河系统径流排泄点进行了3个水文年(2007-01—2010-06)的自动监测, 运用水均衡计算、岩溶水流量衰减分析和H、O稳定同位素等方法, 对该地下河系统径流排泄点的水—碳动态进行了研究.结果表明: (1)原始森林的蒸散发异常强烈, 入渗系数低, 地下河产流少; (2)在缺乏土壤盖层的条件下, 即使是原始森林, 其水文(Q)、水化学(HCO₃-浓度)调控能力仍然有限, 因而岩溶作用强度和碳汇能力较低.这些特征反映出土壤在水资源和碳循环调控中的重要作用. 

Characteristics of Water-Carbon Regime of Banzhai Karst Subterranean Stream System Covered by Virgin Forest in Soil Shortage Environment

Three hydrological years' automatic monitoring (from January, 2007 to June, 2010) was made in the discharge area of karst subterranean stream system covered by virgin forest in soil shortage environment with hydro-chemical auto-recordable instrument. In order to study the characteristics of water-carbon regime of discharge from this subterranean stream system, the methods of water balance calculation, karst water discharge recession analysis and H, O stable isotope analysis were used. The results show that: firstly, the evapotranspiration of virgin forest is unexpectedly high, indicated by low infiltration coefficient and low subterranean river runoff generation; secondly, under the conditions of shortage of soil cover, virgin forest has only moderate ability of regulation and control of hydrological (Q) and hydrochemical (HCO₃- concentration) processes, which results in the karstification intensity and the relevant carbon sink capacity decrease. These characteristics reflect that soil plays important roles in the regulation and control of water resources and carbon cycle.