杉木火力楠混交林营养元素积累、分布和生物循环的研究

本文研究了6年生杉木火力楠混交林营养元素的积累、分布和生物循环,并与杉木和火力楠纯林进行了比较分析。结果表明;不同林分不同树种的营养元素吸收、归还、积累、分布和生物循环不同,其中杉木纯林归还吸收的比值仅为1.86％,火力楠纯林的归还吸收比值为23.13％,是杉木纯林的12倍。混交林归还吸收比值为14.12％,是杉木纯林的7.6倍。混交林能明显地提高营养元素归还量和归还吸收比值,对于防止杉木纯林地力衰退具有十分重要的作用。

A Study on Accumulation, Distribution and Biological Cycling of Nutrient inMixed Forest of Cvnninhgamia Landeolata and Michelia Macclvrei

In this paper, through comparing with pure Cunninghamiv Ianceolata stand and Micheeia macclurei stand , accumulation, distribution and biological cycling of nutrient in the mixed forest ( Cunnmghamia lanceolate, Michelia macclurei ) of six-year have been studied.The results showed the absorption,returning, accumulation, distribution and biological cycling of nutrient in different stands and Kinds of trees were not the same,in which ratio of returning and absorption in pure Cunninghamia lanceolata stand was only 1.86 percent, ratio of returning and absorption in pure Machelia macclurei stand was 23.13 percentand was twelve times as much as that in pure Cunninghamia lanceolata stand, ratio of returning and absorption in mixed forest was 14.12 percentand was six point seven times as much as that in pure C. lanceolata stand, So the mixed forest can increase returning quantity and ratio of returning and absorption of nutrient obviously, and it was very important for pure C. lanceolata stand to prevent soil fertility from declining.