羊草草原群落及其主要植物种群地上部分热值动态的研究

STUDY ON THE CARLORIFIC VALUE DYNAMICS OF ABOVEGROUND PARTS OF ANEUROLEPIDIUM CHINESE-STIPA GRANDIS COMMUNITY AND ITS SIXTEEN POPULATIONS

本文对典型草原有代表性的植物群落——羊草+大针茅草原群落及其占干重95%强的十六个植物种群进行分析,初步阐述了草原植物种群热值动态的一般规律,探讨了导致热值变化的原因,揭示热值动态所反映的种群生长特点和生存策略等问题。

In the present paper, the carlorific value dynamics of aboveground partsin Aneurolepidium chinese-Stipa grandis community and its 16 populationsthrough all growing season are studied. The results show three basic typesof the carlorific value dynamics, onehumped type, wave type and descendtype. There are some differences in growing characteristics and livingstrategies among the dynamics types. The carlorific value dynamics of thecommunity have yet manifested the self-adjustment capability to maintainthe carlorific value of the community relatively stable. The study indicates that there are carlorific value differences betweendifferent populations, and between same populations in different successionalstages and in different communities. The shrub population has the highestcarlorific value, the carlorific values of tall herbs including the dominant,edificato and co-edificato populations are higher than that of others exceptshrub, and gramineous grasses dominant in community higher than mixedgrasses population. The possible causes leading to the carlorific value dif-ferences are discussed. It is believed that population carlorific value is restricted by ecologictaxonomic units, expressing complementation in community to keep itsrelative stability, on the carlorific value curves the ascension and descen-sion stand facing each other, the peaks and valleies appear at the sametime. In addition, the carlorific value dynamics have certain resembilityamong the populatons belonging to the close kindship.