不同生境下砂蓝刺头(Echinops gmelini)形态结构及生物量分配特征

doi:10.7522/j.issn.1000-694X.2017.00043

摘要/Abstract

摘要： 砂蓝刺头（Echinops gmelini）是沙区常见一年生草本，具有繁殖比例高、密度高和生长速度快等特征，是研究区春季和早夏季节植物群落组成中最重要的草本植物。沙区人工植被演替过程中，群落中砂蓝刺头个体构件形态和生物量分配特征及其对土壤生境恢复的指示意义是本研究目的。分析了不同植被恢复阶段的沙地中（2010年铺设草方格、始植花棒、始植油蒿和1989年始植柠条与油蒿的固沙区，分别为生境1、2、3和4）砂蓝刺头构件形态及生物量分配特征。结果表明：（1）人工植被建立早期，初步稳定的沙面条件有利于砂蓝刺头的生长，而随着人工植被建立时间的增长呈现出种群衰退的趋势。4个生境间砂蓝刺头在株高、基径、根长、花序数及各器官生物量方面均差异显著（P<0.05），其大小关系是生境2 > 3 > 1 > 4。（2）不同生境地上-地下生物量间均为等速生长关系，且存在共同相关生长指数1.036，支持等速生长假说；地上-叶生物量间具有共同异速生长指数（0.874，异速生长关系）；营养体-繁殖生物量间均表现出α>1异速生长关系，即繁殖生长资源的积累速率快于营养体生长。（3）株高、花序数与地上部分生物量间具有显著或极显著的正相关关系，表现出较好的协同变化趋势。总之，不同生境间砂蓝刺头形态结构及生物量特征具有明显差异，而构件生物量间相关生长关系的一致规律性及较稳定的繁殖生物量分配，有利于其适应异质生境并完成生长发育。

关键词: 砂蓝刺头(Echinops gmelini), 一年生植物, 形态结构, 生物量分配, 人工固沙植被区

Abstract: Annual species are a major component of sand ecosystem herbaceous vegetation. Echinops gmelini is widely distributed in desert regions, which contains characteristics of germination early, high density, fast growth and reproduction ratio higher. And it is the most important component of desert communities at late spring and early summer. This paper aims are with the evolution of the sand habitats restoration and vegetation that morphology and biomass allocation characteristics of E.gmelini will change and it has instruction significance for soil habitat restoration? This study analyzes E. gmelini morphology and biomass allocation characteristics in the different stages of vegetation restoration of desert. The results showed that:(1) The preliminary stability of sand surface conditions are conducive to the growth of E. gmelini and then present a trend of population decline after a long succession. (2) The relationships between aboveground biomass and belowground biomass were isometric in all habitats, which did support isometric scaling hypothesis.In addition, aboveground biomass and leaf biomass, aboveground biomass and leaf biomass were all allometric in four habitats. (3)Plant height, inflorescence number and the ground biomass had significant or extremely significant positive correlation that showed a good synergy change trend.

Key words: Echinops gmelini, annual plants, morphological structure, biomass allocation, artificial sand-fixation region

中图分类号:

Q948.11

王艳莉, 齐欣宇, 杨昊天, 宋光, 都军. 不同生境下砂蓝刺头(Echinops gmelini)形态结构及生物量分配特征[J]. 中国沙漠, 2018, 38(4): 756-764.

Wang Yanli, Qi Xinyu, Yang Haotian, Song Guang, Du Jun. Morphological Structure and Biomass Allocation of Echinops gmelini in Different Habitats[J]. Journal of Desert Research, 2018, 38(4): 756-764.

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