非常规月份、单次降水过程后林木对降水金属养分元素浓度的影响

IRROUTINE MONTH,AFTER SINGLE PROCESSOF RAINF ALL,THEEFFECT OF DAHURIAN LARCHON METALLIC NUTRIENT ELEMENT INPRECIPITAT1ON

１９９２年春夏，大兴安岭北部出现了长期无雨天气本文重点研究林木在无雨期后首次和第二次降水过程中对降雨金属养分元素浓度的影响。结果表明：兴安落叶松林系统对Ｃａ、Ｋ、Ｎａ、Ｍｇ、Ｚｎ的吸收量大，使得降雨后输出系统的养分处于积累状态，另外，该地区空气尘埃含量少，不同时间降水金属养分元素含量变化不大，但林内雨的金属养分元素浓度却有着明显变化。从再分配降水金属养分元素浓度变化情况来看，兴安岭落叶松林除了对Ｃａ具有明显的吸收作用和能迅速脱溶较多的Ｋ和Ｎａ外，林分能大量提供Ｚｎ，但对其它微量元素影响不大，可以说林木是降水金属养分元素的分布、循环、集累、亏损、输入、输出的支柱。

The weather of non-rain in long time was appared during1992 of spring and summer in North of DAXINGANLING Mountains,This papcr is reported the effect of the Dahurian larch(Larix gmelini )on metallic nutrient element in precipitation of first and second in thewerther. The conclusions were as follows:The assimilation of larch forest system on Ca、K、Na、Zn is verybig; The metallic nutrient element of content in precipitation is notheen changed in diffent time。 But metallic nutrient elen1ent of contentin through fall is diffent. In addition,The large number of Zn wasprovided by the larch foret system。So the larch forest system is mainstayon distribution,cycling,accumulation, loss, importation and exportationin metallic nutrient element in precipitation。