期刊论文

Effects of stand density on the biomass and distribution of roots in Pinus elliottii plantations

中文

森林与环境学报

Journal of Forest and Environment

2096-0018

2015

28

1

45-52

10.13324/j.cnki.jfcf.2015.01.008

“十二五”农村领域国家科技计划专题“湿地松高世代及脂用种质创制、新品种选育及示范”(2012BAD01B0203)；

本校为其他机构

为了确定湿地松中龄林的施肥位置和准确估测根系生物量,以湘北11年生5种造林密度湿地松为研究对象,采用全根分层挖掘法,对其根系生物量及其空间分布规律进行了研究。结果表明:湿地松根系发达,单株根系生物量随林分密度的增大而减小,林分根系生物量基本随林分密度的增大而增大。根桩和大根是构成根系的主体,合计占总根量的85.8%-89.4%。不同密度林分根系生物量随土层深度的增加而明显减小,63.1%以上的根系生物量集中分布在0-40 cm土层内,81.4%以上的根系(含根桩)生物量集中分布在距树干0-50 cm范围内,因此应在1/2株行距、20 cm深度的位置施肥最好;根系与树干相关性最大;建立的单株各径级根系生物...

In order to determine the position of the fertilization of middle-aged Pinus elliottii and estimate the root biomass accurately , root biomass and root spatial distribution were investigated using layered total root excavation method in 5 different densities （1 667, 2 000, 2 400, 3 330, and 3 900 trees· hm-2） on 11 year-old P.elliottii plantations in the north Hunan, China.The results showed that the roots of P.elliottii developed well , the root biomass of individual tree decreased , but root biomass of the stand increased with the increase...