论文部分内容阅读
对北京密云水库集水区板栗林水化学性质研究表明 :在研究期间 ,不同月份大气降水化学元素的含量变化范围较大 ,以加权平均值之和来计 ,6月份化学元素含量最高 ,观测时段内所测定元素加权平均值之和为 12 0 0 11mg L ,各元素含量按大小排序为Ca >N >K >Mg >Na >P >Fe>Zn >Cu >Mn ;大气降水经过林层后 ,林内穿透降水和树干茎流中各化学元素含量变化基本一致 ,大多数元素含量增加 ,林内穿透降水化学元素含量之和为 17 110 5mg L ,树干茎流为 35 5 0 74mg L ,比大气降水分别高出 5 10 94mg L和 2 3 5 0 6 3mg L .
The chemical properties of chestnut forest in Miyun Reservoir watershed in Beijing showed that during the study period, the content of chemical elements in the precipitation varied greatly in different months. The content of chemical elements in June was the highest in terms of the weighted average value. During the observation period The sum of the weighted average values of the elements in the samples was 12 0 11 mg L, and the content of each element was ordered as Ca> N> K> Mg> Na> P> Fe> Zn> Cu> Mn. The contents of chemical elements in the forest penetration and stem-stem flow were basically the same, most of the elements increased, the sum of the chemical elements in the forest penetration and precipitation was 17 110 5 mg L and 35 5 74 mg L in the trunk stem, Precipitation increased by 5 10 94 mg L and 2350 6 3 mg L, respectively.