【摘要】 20 0 0— 2 0 0 1年在西藏色季拉山对急尖长苞冷杉林生态系统进行了大气降水的连续观测 ,并对降水的元素和离子含量进行了常规分析。结果表明 :急尖长苞冷杉林生态系统的大气降水中化学元素输入量的大小顺序为 :Zn >N >Mg >Fe >Ca >P >Na >K ,各元素的输入量分别为 2 5 1、2 3 3、8 1、4 1、1 9、0 4、0 0 2 6、0 0 0 7kg·hm- 2a- 1 ;SO42 - 、HCO3- 和Cl- 的输入量分别为 74 2 6、74 3和 5 1 6kg·hm- 2 a- 1 ;养分的输入以降雨为主。林冠淋溶是以Na元素为主 ,而树干淋溶则是以P元素为主。林冠对Fe、Zn、HCO3- 、Cl- 、N、SO42 - 等元素和离子有吸收作用。更多还原

【Abstract】 A study on precipitation in the Abies smithii forest ecosystem of Mountain Sejila in Tibet has been done in the year of 2000—2001. Contents of the nutrient elements and ions of precipitation have been analysed. The results showed: the content and input of nutrients from precipitation in the Abies smithii forest ecosystem of Mountain Sejila in Tibet were Zn >N >Mg >Fe >Ca >P >Na >K. The input quantities were 25.1、23.3、8.1、4.1、1.9、0.4、0.026、0.007 kg·hm -2a -1 respectively, and the input quantities of SO 4 2-、HCO 3- and Cl- were 742.6、74.3 and 51.6 kg·hm -2a -1 respectively. The main nutrient inputs were from rainfall. The main element in eluviations from forest canopy was the element Na, but that from tree trunks was the element P. The forest canopy possessed absorption capabilities upon the elements and/or ions of Fe, Zn, HCO 3-, Cl-, N, SO 4 2- and so on.更多还原