摘要
在新疆北部准噶尔荒漠的莫索湾地区,通过样方调查记录了2008年早春季节短命植物萌发到消失的群落特征变化,并结合同时段冬春季节的气温、降水等资料,分析了短命植物层群落年内变化与水热条件之间的密切关系。结果表明:早春季节首次降水的时间和降水量是决定短命植物萌动生长的主要因素,而出苗后的降水状况将显著影响当年的群落外貌特征,干旱高温季节到来的时间将决定短命植物最终的生活周期。此外,短命植物生长发育对偶然阵性降水具有极高的敏感性和适应性。
Ephemeral plant（ Ephemerals） is generic terms a kind of plant group with very short life cycle or growth cycle and the growth cycle is 2 months or so commonly,then part or the whole plant dry dead on the ground and have a bad season in the form of components in below ground organs of dormant seeds. Ephemerals,including annual ephemerals and ephemeroids,are characterized by short-term growth rhythms and specific biological traits adapted to deserts or temperate broad-leaved deciduous forests. Few studies have been carried out on ephemeral community composition and their relationships with temperature and precipitation regimes in the desert. In 2008,we monitored the early-spring ephemeral community change in the Mosuowan area of the Junggar Desert,northern Xinjiang. We also collected temperature and precipitation data to analyze the effects of these factors on ephemeral adaptation. It turned out that the time and amount of the first rainfall were the important factors to determine the time of the germinating,and the precipitation status after seedling had significant effect on the community physiognomy in the current year,while the emergence time of hot-dry season determined the life cycle of the ephemerals. Additionally,Ephemeral plant has a special growth phenomenon with vegetative growth and reproductive growth over the same period,the growth and development of ephemerals showed a very high sensitivity and adaptability to the variations of hydrothermal conditions,especially to the precipitation that appears occasionally. Ephemeral plant ＂a race against time＂growth has high consistency with the water hot configuration.
出处
《干旱区研究》
CSCD
北大核心
2015年第5期941-946,共6页
Arid Zone Research
基金
国家自然科学基金青年科学基金(41201433)
国家自然科学基金重点资助项目(41030535)
关键词
短命植物
植物群落
物种多样性
水热条件
准噶尔盆地
新疆
ephemeral plants
plant community
species diversity
hydrothermal conditions
Junggar Basin
Xinjiang
作者简介
袁素芬（1981-），女，博士，主要从事生态恢复和环境保护等方面的教学和研究．E—mail：yuansf-007@163．com
