【摘要】 <正> 1 引言 在林地里,树木的叶子、枝条、树皮、果实,有时甚至整株树木都周期性地归还土壤,这种凋落物养分归还是森林生态系统的一个重要特点。但林木吸收的大部分养分,除由凋落物归还土壤外,还能由树冠淋洗归还土壤,在我国东北地区森林生态系统研究工作中,红更多还原

【Abstract】 Nutrient elements in precipitation and throughfall are studied in a pine-spruce-fir forest of Changbai Mountain Natural Reserve. The amount of nutrient elements in throughfall is higher than that in precipitation, and their leached amount from canopy is in an order of K>Mg>Ca>N. From the viewpoint of nutrient return, throughfall plays a more important role in comparison to litterfall.更多还原