青藏高原东部植物种子萌发能力与其在群落中相对多度的关系  

The Relationship between Seed Germinability and Species Abundance in Communities on Eastern Qinghai-Tibet Plateau

作　　者：张佳宁[1,2] 刘坤[2] 王桔红[3] 

机构地区：[1]甘肃省科技情报研究所,甘肃兰州730000 [2]兰州大学生命科学学院,甘肃兰州730000 [3]韩山师范学院生物系,广东潮州521041

出　　处：《植物分类与资源学报》2013年第3期317-326,共10页Plant Diversity

基　　金：科技部科技基础性工作专项重点项目(2007FY110100);中央高校自由探索面上项目(lzujbky-2012-118)

摘　　要：不同演替阶段的群落中植物幼苗建植特性以及幼苗建植时所处的环境都会有所不同。这些差异可能会导致种子萌发率与物种多度之间的关系随着群落的演替阶段而发生改变。目前关于不同类型群落中以及同一类型群落的不同演替阶段物种多度和种子萌发能力之间的关系的研究较少。本研究以全面收集的青藏高原东缘3种常见次生植被(鼢鼠土丘群落、人工草地群落和弃耕地群落)中植物种子为基础,沿着群落演替梯度来探明种子萌发和物种多度之间的关系。通过对结果的线性回归分析发现:在鼢鼠土丘群落和人工草地群落中,种子萌发率和物种多度之间无显著相关性;而在弃耕地群落中,种子萌发率和物种多度之间的关系有随着群落的演替呈现由正相关向负相关转变的趋势。We haven＇t found any studies on the relationship between seed germinability and species abundance at community level. And the relationship between seed germinability and species abundance may differ in communities of different successional stages and vegetation types. This is because communities usually have different biotic and abiotic environmental factors, consequently, the possibility for seedling establishment in them may be different. Yet, no research has tested the relationship between germinability and species abundance along successional gradients in different types of vegetation. We extracted sampling data of the successional gradients in three types of secondary vegetation （zokor mounds, artificial grassland and abandoned arable land）, and tested the germination of species appeared in these successional gradients. Then, we tested the relationship between seed germination and species a- bundance along the successional gradients. Linear regressions showed no significant relationships between seed ger- mination and species abundance in the various successional stages on zokor （a burrowing rodent） mounds or in an Elymus nutans artificial grassland. Although the relationship between seed germination and species abundance in the initial successional stage of abandoned arable land was significantly positive, there was no such relationship in the later successional stages. In abandoned arable land, the magnitude and direction of the relationship between seed germination and species abundance （ percentage cover） varied with successional stage, with a positive relationship in the original successional stage and a trend towards a negative relationship as succession progressed.

关 键 词：次生植被 种子萌发 物种多度 亚高山草甸 演替 

分 类 号：Q948[生物学—植物学]