原始红松林积雪与融雪径流水化学特征分析

于2009年4月初～5月中旬，对凉水自然保护区内原始红松林积雪与融雪径流的pH值、电导率及SO4^2-、Cl^-、NH4^＋、NO3^-、总氮（TN）、总磷（TP）的浓度进行了测定，结合积雪厚度的变化，初步探讨了原始红松林积雪与融雪径流水化学特征及其变化规律。结果表明：1）不同郁闭度的原始红松林中各化学成分所表现的规律...

Characteristics of snowpack and snowmelt runoff chemistry in virgin Pinus koraiensis forest

We measured the pH, EC and concentrations of SO2-4, Cl-, NH+4, NO-3, total nitrogen (TN) and total phosphorus (TP) in snowpack and snowmelt runoffs in the virgin Pinus koraiensis forest in Liangshui Nature Reserve from March to May 2009. Combining with the thickness of snowpack, we discussed the characteristics and variations of snowpack and snowmelt runoff chemistry. The results were shown as the followings. 1) The chemical compositions varied among stands with different canopy closures, in which EC, Cl-, NO-3, SO2-4 and TN were highest in stands with a canopy closure of 0.5 or 0.6. It illustrated that the P. koraiensis forest with a canopy density of 0.5-0.6 was the most effective in retaining nutrients. The correlation analysis showed a significantly negative correlation between snowpack thickness and EC. The concentrations of SO2-4, Cl-, TN and NO- 3had extremely negative correlation with the thickness of snowpack as well. 2) During the snow melting period, the fluctuation ranges of the chemical constituents in the tributaries of the virgin Pinus koraiensis forest were smaller than those in the mainstream outlet except for pH. Both the tributaries and mainstream exhibited a phenomenon of “ionic pulse”, which appeared later in the tributaries with a lower peak. 3) The pH, EC and the concentrations of SO2-4 in the mainstream and tributaries were lower in the early snow melting period than in the snowpack, while the others showed an opposite tendency.