摘要
研究了藏嵩草构件群体特征及火烧对此特征和草甸群落组成的影响，所得主要结论为：（１）藏嵩草种群的年龄结构属稳定型；（２）随其株丛增大分蘖密度减少，有性枝／无性枝的比例增加；（３）分蘖群体中的分蘖均重与密度关系不符合“恒定最终产量法则”，不发生因分蘖间竞争而致的密度自疏现象；（４）火烧显著提高每株丛地上部生物量，增加无性枝数量、降低有性枝数量；（５）火烧使群落组成显著变化，物种多样性提高．
The characters of modular populations of Kobresia tibetica and the influences of the fire treatment on its characters and the composition of meadow communities are studied . The conclusions drawn from these studies are as follows:1)The age structure of K. tibetica populations is a steady type.2)As the basal area of thicket increases, the tiller density decreases, and the ratio of vegetative shoots/reproductive shoots decreases.3)The relationship between average tiller weight and density in the tiller populations does not conform to the “constant final yield law”; no density self thinning process results from the competition among the tillers. 4)The fire can increase the overground biomass per thicket and the number of vegetative shoots, but decrease the number of reproductive shoots. 5)After the fire treatment the community composition changes notably, the species diversity increases.
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
1999年第1期172-178,共7页
Journal of Lanzhou University(Natural Sciences)
基金
国家自然科学基金
关键词
藏蒿草
构件群体
火烧
物种多样性
Kobresia tibetica
modular population
fire treatment
species diversity
