暖温带两种针叶林生态系统中茎流和穿透雨的养分特征研究

通过对暖温带地区两种典型人工针叶林生态系统内树干茎流和穿透雨的收集，对其中Ｎ、Ｐ、Ｋ、Ｃａ、Ｍｇ、Ｓ和Ａｌ等７种元素进行了测定。研究发现这些养分元素在树干茎流和穿透雨中的含量在年内有明显的时间动态变化，这些变化主要受元素在水分中的含量和它们在植物生命活动中的活跃程度等影响，甚至在不同的针叶林生态系统之间都有一定的差异，其中表现为明显的是Ｎ、Ｋ和Ｓ。

NUTRIENT CHARACTERISTICS OF STEMFLOW AND THROUGHFALL IN TWO CONIFEROUS FOREST ECOSYSTEMS

Stemflow and throughfall were collected through the course of a single rainy season from two coniferous forest ecosystems and their nutrient content analysed. Significant changes were found in concentrations of the nutrient elements (total nitrogen, total phosphorus, potassium, calcium, magnesium, sulfur, and aluminum) through the ralny season. Most of those elements had higher concentrations in stem flow and throughfall at the beginning of the rainy season, and lower in the middle, but were highest at the end of the season. Seasonal patterns in stemflow varied significantly among indivldual elements, and in some instances patterns for particular nutrients also differed between forests. Significant variation in stemflow was especially noted for nitrogen, potassium and sulfur.