民勤天然梭梭种群特征初步研究

摘要/Abstract

摘要： 对民勤荒漠区新发现的天然梭梭种群进行了调查,并分析了沙地梭梭和盐碱地梭梭种群生长及其与土壤水分的关系,种群结构及其分布格局。结果表明,沙地梭梭种群生长优势明显,种群密度大,盖度高,平均为47株丛·hm-2和2.1%,盐碱地梭梭种群生长缓慢,密度、盖度较小,为24株丛·hm2和1.2%,这与土壤水分条件具有较好的一致性。沙地梭梭和盐碱地梭梭种群均属于衰退型种群,需要采取适宜的措施进行保护,否则将可能被其他更新力较强的伴生种所取代。沙地梭梭种群呈集群分布格局,盐碱地梭梭种群则为均匀分布,这不仅与梭梭种群密度不同出现种内或种间竞争的结果,也与生态环境存在着密切的关系。

关键词: 民勤, 天然梭梭, 种群生长, 种群结构, 分布格局

Abstract: Based on the investigation into natural Haloxylon ammodendron in Minqin desert area, the population growth of Haloxylon ammodendron on the sandlot and alkali-saline soil, the relation between population growth and soil moisture, as well as its population structure and spatial distribution, were analyzed. The result indicated that population growth of natural Haloxylon ammodendron on the sandlot is obviously superior to that in alkali-saline soil, with density and coverage of population at the sandlot being 47 individuals per hectare and 2.1%, while that in alkali-saline soil being 24 individuals per hectare and 1.2%. This result is well compatible to soil moisture. The age structure of Haloxylon ammodendron population either on sandlot or on alkali-saline soil took a declining trend. So it is imperative to adopt favorable measures to protect Haloxylon ammodendron population, otherwise it will be replaced by other concomitance species with better regeneration power. Haloxylon ammodendron population is distributed in a clustered pattern on the sandlot while distributed evenly on the alkali-saline soil. This is closely related not only to inter-species and intra-species competition caused by different density of Haloxylon ammodendron population, but also to habitat environment.

Key words: Minqin, natural Haloxylon ammoderon, population growth, population structure, spatial distribution

中图分类号:

Q498.15

张锦春;王继和;安富博;孙涛;刘有军;李银科;肖斌. 民勤天然梭梭种群特征初步研究[J]. 中国沙漠, 2009, 29(6): 1124-1128.

ZHANG Jin-chun;WANG Ji-he;AN Fu-bo;SUN Tao;LIU You-jun;LI Yin-ke;XIAO Bin. Population Characteristics of Natural Haloxylon ammoderon in Minqin, Gansu of China[J]. JOURNAL OF DESERT RESEARCH, 2009, 29(6): 1124-1128.

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