摘要
小山蒜(Allium pallasii)是中国新疆特有的类短命植物。调查了准噶尔荒漠16个20m×20m样地内小山蒜种群的分布概况,研究了小山蒜盛花期的生物学特征、器官生物量分配及其相互关系。结果表明:①小山蒜多生于沙丘中下部,密度为0.187株.m–2;平均株高为(22.93±5.15)cm,多为3片叶;花序近球形,平均半径(2.44±0.37)cm,纵断面角度211.39°±60.4°,表面积和体积分别为(50.95±34.19)cm2和(43.37±29.45)cm3。②其形态指标(平均叶长、4个花球指标及鳞茎直径)间、生物量指标(根生物量除外)间,及二者之间多为显著(P<0.05)或极显著(P<0.01)正相关,协同生长关系较强。③小山蒜生物量分配呈鳞茎>花葶>花球>叶片>根的格局,根冠比为0.873,生殖分配占49.66%。④形态指标与生物量间均呈α<1的异速生长关系,而生物量指标间多为等速关系,其中地上、地下生物量间符合α=3/4的异速关系。⑤生物量估测表明,小山蒜单株地上生物量平均为0.312g,单株地下生物量平均为0.264g,种群总生物量密度仅为0.106g.m-2,其生物量在整个荒漠生态系统中可忽略不计,但它作为准噶尔荒漠重要而独特的种质资源,应从多个方面深入研究,同时进行适当保护。
Allium pallasii, an ephemeroid species, is widely distributed in Junggar Basin, China, and it plays a certain role in synusiae communities of the herbaceous plants in spring. The distribution of A. pal- lasig population in sixteen 20 m × 20 m plots were surveyed by the method of whole plant excavation, and the biological characteristics, biomass allocation and their relationships were studied in this paper. Results indicate that （1） A. pallasii population is mostly distributed at the lower parts of sand dunes, and the popu- lation density is 0. 187 individual per square meter; The mean shoot height is 22.93-5.15 cm, most of the individuals have 3 sheets of leaves; The inflorescence is nearly spherical, and the mean radius of the flowers is 2. 4440.37 cm, the mean angle of vertical section of the flowers is 211.39-60.4, and the surface area and volume of the flowers are 50.95 - 34.19 cm2 and 43.37 -29.45 cm3, respectively. （2） There are markedly （P〈0.05） or very markedly （P〈0.01） positive correlations among morphological indices （mean leaf length, the four flower morphology indicators and the bulb diameter）, among organ biomasses （except root biomass）, and between morphological indices and organ biomasses of A. pallasii, indicating there existed evident cooperative growth relationships between the indices. （3） The organ biomass distribution or- der of A. pallasii is bulb〉scape〉flower〉leaf〉root, and the root/shoot ratio is 0. 873, and the reproduc- tive allocation ratio is 49.66 %. （4） There are obviously allometric relationships between morphological in- dicators and organ biomasses with allometric exponents less then 1.0. The allometric exponents among or- gan biomasses are mostly close to 1.0, only the allometric exponent between aboveground and belowground biomass is 3/4. （5） The biomass measurement of A. pallasii samples showed that mean aboveground bio- mass of A. pallasii population is 0. 312 g per individual, mean belowground biomass is 0. 264 g per individu-
出处
《中国沙漠》
CSCD
北大核心
2012年第5期1328-1334,共7页
Journal of Desert Research
基金
国家重点基础研究发展计划项目(2009CB825104)资助
关键词
小山蒜
形态特征
生物量
异速生长
类短命植物
准噶尔荒漠
Allium pallasii
morphological character
biomass
allometric growth
ephemeroid plant
the Junggar Desert
