摘要
喀斯特作为一种独特的生境,在陆地生态系统中占有很大面积,是开展生态恢复的重点地区。对黔西北地区喀斯特生态系统中主要植物的物候特征及其与非生物和生物因素的关系进行研究表明,观测植物各物候期具有明显的季节性,开花期和果熟期都呈现单峰格局。温度和降雨量与多数物候期时间格局的相关性显著,春季温度升高和降雨量增加促进了植物展叶和开花,落叶期的旬均温与落叶物种比例显著相关。灌木平均始展叶期早于乔木,而乔木更早出现开花高峰。但乔木和灌木在果熟期格局上没有差异。风媒植物的始花期明显早于虫媒植物,开花高峰出现也更早,但两个类群植物开花的持续时间一致。该地区植物物候受到多种因素的综合作用,且不同物候期的主要影响因素不同。探讨植物物候格局对于理解植物与喀斯特环境的关系以及开展生态恢复具有重要意义。
Karst is a kind of unique habitat and makes up a large proportion of terrestrial ecosystem. Many researches on ecological restoration are carried out in karst area. However little is known about the phenology of the plants grown in the habitat. This study focused on the phenological patterns of main plant species in the karst ecosystem in Bijie of northwest Guizhou and discussed the effects of abiotic and biotic factors. All the phenophases showed strong seasonality and unimodal pattern was observed in flowering and fruit ripening. Weather factors had the partial influence on different phenological events. The increasing temperature and rainfall facilitated leaf unfolding and flowering in spring,and the mean temperature in ten days during the leaf shedding period was significantly correlated with the species percentage of leaf shedding plant. Date of leaf unfolding was earlier in shrubs while the peak of flowering emerged earlier in trees. No difference was found in fruit ripening patterns between different life form groups. Initial flowering date was much earlier in wind-pollinated plants and temporal flowering patterns were also different in wind-pollinated and insect-pollinated plants,but no difference in the duration of flowering between the two groups. Plant phenologies are the result of interactions of many internal and environmental factors,and different factors have various effective strength. Phenological studies in karst area are important for ecological restoration and understanding the relationships of habitats and plants.
出处
《山地学报》
CSCD
北大核心
2010年第6期695-703,共9页
Mountain Research
基金
国家科技支撑计划项目"喀斯特山区水土保持关键技术集成研究与示范"(2007BAD53B02)~~
