欢迎访问林业科学,今天是

林业科学 ›› 2003, Vol. 39 ›› Issue (6): 1-7.doi: 10.11707/j.1001-7488.20030601

• 论文及研究报告 •    下一篇

沙棘-杨树混交林生物量、林地土壤特性及其根系分布特征研究

崔浪军 梁宗锁 韩蕊莲 杨建伟   

  1. 中国科学院水利部水土保持研究所,杨凌712100;南阳师范学院生物系,南阳473061
  • 收稿日期:2002-02-27 修回日期:1900-01-01 出版日期:2003-11-25 发布日期:2003-11-25

BIOMASS,SOIL AND ROOT SYSTEM DISTRIBUTION CHARACTERISTICS OF SEABUCKTHORN×POPLAR MIXED FOREST

Cui Langjun,Liang Zongsuo,Han Ruilian,Yang Jianwei   

  1. Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources Yangling712100;Biology Department of Nanyang Normal College,Henan Province Nanyang473061
  • Received:2002-02-27 Revised:1900-01-01 Online:2003-11-25 Published:2003-11-25

摘要:

选择黄土高原的26a杨树纯林作为对照,对沙棘杨树混交林中的杨树生长、林地土壤特性及根系分布特征进行系统研究。结果表明:混交林平均株高比杨树纯林的高44.8% ,胸径平均大32.7% ,林分生物量高139.76% ;地上各部分生物量都明显高于杨树纯林;混交林地与杨树纯林地相比,土壤表层各层容重减小,孔隙度增大,两林地土壤含水量除8月份接近外,其他月份混交林地都要高;混交林土壤全N比杨树纯林地高5%~69.0% ,土壤全P含量没有明显的差别,但速效P高出22.4%~233.3 %。根系分布特征研究表明:杨树纯林中根径<3.5mm和3.5~10mm的根系主要集中分布在表层0~30cm ,而混交林主要分布在0~105cm的范围内,相对更深、更均匀;杨树纯林中根径>10mm的根系分布比混交林更深、更均匀。混交林的根径为<3.5mm和3.5~10mm的根系分布范围大体相同,根径>10mm根系的分布范围要小。

关键词: 沙棘, 杨树, 混交林, 生物量, 土壤特性, 根系分布

Abstract:

The biomass,soil characteristics and root distribution of 26-year-old pure poplar(Populus simonii)stand and poplar-seabuckthorn(Hippophae rhamnoides)mixed stand were measured in Ansai,Shaanxi,Loess Plateau.The results showed that mean height,DBH and stand biomass were 44.8%,32.7% and 139.76% higher in the mixed stand than in the pure stand respectively.Biomass allocation patterns of two forest stands were different remarkably.Total biomass,as well as each of the parts in the mixed stand,was higher than that in the pure stand.Compared with the pure stand,soil bulk density and porosity of each layers in the mixed stand were respectively reduced and increased;soil water content in the mixed stand is higher except in August;and the soil total N content and rapidly P were 5%~69.0% and 22.4%~233.3% higher in the mixed stand,with total P content almost unchanged.Poplars root system in the pure stand(diameter<3.5mm and 3.5~10mm)were mainly distributed over soil 0~30cm,yet those in the mixed stand were distributed deeper and evener.On the contrary,the distribution of the poplar root system(diameter>10mm)in the pure stand was deeper and evener than in the mixed one.Horizontal distribution extent of the poplar root(diameter<3.5mm and 3.5~10mm) in the mixed stand was close to this in the pure one,yet the other one(diameter>10mm)in the former was narrower than the latter.

Key words: Seabuckthorn, Poplar, Mixed stand, Biomass, Soil characteristic, Root distribution