一前言生态系统中的物质流积累与归还,是衡量生态系统动态变化的重要标志之一,也是生态系统研究最基本的组成部分。国外在这方面已做了大量研究,国内对针叶林的研究已开始。泡桐(Paulownia)是我国分布广泛的树种之一。由于其具有生长迅速、材质良好和繁殖容易等特点,因而在我国中部平原和丘陵地区大量栽植。其中河南栽植数量最多,目前现存株数已有三亿株。人工泡桐林树种单一,层次单一,是一种结构简单的人工栽培群落。同时不少地区实行农桐间作,大量泡桐引入农田。泡桐林物质流的循环,不仅对泡桐林本身有密切关 I. INTRODUCTION The accumulation and return of material flows in ecosystems is one of the most important indicators to measure the dynamic changes of ecosystems. It is also the most basic component of ecosystem research. Abroad has done a lot of research in this area, the domestic research on coniferous forest has begun. Paulownia (Paulownia) is one of the widely distributed species in our country. Because of its rapid growth, good material and easy reproduction and other characteristics, so in our central plains and hilly areas planted in large numbers. The largest number of planting in Henan, the current number of existing plants has 300 million strains. Artificial Paulownia tree species single, single level, is a simple structure of artificial cultivation community. At the same time in many areas to carry out Intercropping wheat, Paulownia introduced a large number of farmland. Paulownia forest material flow cycle, not only Paulownia itself is closely related