摘要
为揭示米老排生长过程中养分元素积累特点和分配规律,采用Monsic分层切割法,对广西高峰林场12年生(中龄林)米老排人工林的5种养分元素(N、P、K、Ca、Mg)的含量进行测量,分析其林分的积累量及分配特征。结果表明:(1)米老排不同器官养分元素含量依次为树叶>树皮>树枝>树根>树干;各器官养分元素含量表现为:树叶、树干和树根N>K>Ca>Mg>P;树枝为K>Ca>N>Mg>P;树皮为K>N>Ca>Mg>P。(2)米老排人工林养分总储量为1 310.36 kg/hm2,其中乔木层养分储量为1 177.74 kg/hm2,占总养分储量的89.88%;草本层、灌木层以及凋落物层的养分积累量分别为2.92 kg/hm2、3.93 kg/hm2和125.77 kg/hm2,分别占林分总积累量的0.20%、0.30%和9.60%。(3)乔木层养分元素年净积累量为98.15 kg/(hm2·a),各器官的年净积累量顺序为树干>树枝>树根>树叶>树皮。(4)米老排人工林乔木层每积累1 t干物质需要5种养分元素7.63 kg,其养分元素利用效率低于杉木,但明显高于马占相思、湿地松和灰木莲人工林。
Mytilaria laosensis is a broad-leaved tree species indigenous to subtropical areas of south China, and is widely planted in Guangxi and Gnangdong provinces due to its fast growing and high-quality timber. It has great ecological and economic value. In this paper, we analyze the nutrient elements （N, P, K, Ca and Mg） of a 12- year-old （middle-age） Mytilaria laosensis plantation in Gaofeng forest farm of Guangxi, China. The results are as follows ： （ 1 ） Changes in nutrient contents for different organs in the same M. laosensis in the order of leaves 〉 bark 〉 branch 〉 root 〉 trunk. The order of nutrient elements concentration was N 〉 K 〉 Ca 〉 Mg 〉 P in leaves, trunk and root; K〉Ca〉N〉Mg〉P in branch; K〉N 〉Ca〉Mg〉P in bark. （2） The total nutrient storage in the M. laosensis plantation was 1 310.36 kg/hm2. Of the total storage of nutrients, 89.88 % was distributed in arbor layer, 0.20 % in herb layer, 0.30 % in shrub layer and 9.60 % in litter layer. （3） The annual net accumula- tion of nutrient elements of M. laosensis plantation was 98.15 kg/ （hm2·a）. The net accumulation of nutrient el- ements of five organs was in the order of trunk 〉 branch 〉 root 〉 leaves 〉 bark. （4） The net production of organic matter per ton requires five nutrient elements totalling 7.63 kg, and the nutrient utilization efficiency of the M. laosensis plantation was lower than that of a Cunningharnia lanceolata plantation, but significantly higher than that of Acacia mangium, Pinus elliottii and Manglietia glauce plantations.
出处
《西部林业科学》
CAS
2015年第3期148-152,共5页
Journal of West China Forestry Science
基金
广西"十一五"林业科技项目(桂林科字2009[08])
国家自然科学基金项目(31160152)
关键词
米老排
中龄林
养分元素
积累
分配
Mytilaria laosensis
middle-aged plantation
nutrient elements
accumulation
distribution
