摘要
基于实地调查,依据基径和高度分级数据,通过年龄锥和年龄结构拟合函数分析库姆塔格沙漠3个典型种群的年龄结构特征和种群生长状态及发展趋势。结果表明:梭梭种群年龄结构呈反"J"型曲线,目前属于稳定增长型种群,但因其幼苗数量相对较少使其增长受限;沙生柽柳种群年龄结构呈"铃"型曲线,虽然表现出类似稳定型种群特征,但由于幼龄植株数量很小,中龄级的植株数量比例较大,种群存在衰退威胁;胡杨种群年龄结构具有一定的特殊性,呈反转"S"型曲线,中、大龄级植株数量保证了种群能够维持一定的稳定状态,而幼龄级数量较大,使种群具有一定的增长潜力。3个典型种群各自年龄结构特征使其面临着不同程度的生存威胁,必须采取不同的保护措施以维持种群结构的稳定和发展。
Based on the spot investigation,taking the height and ground diameter data as the basis,according to the age pyramid and the fitting equation of age structures,the age structure characteristics,growth status and development trend of the three typical plant populations of Kumtage desert were studied.The results showed that the age structure of Haloxylon ammodendron population was inverted ＂J＂ shape curve,and the population is currently in rising stage and is stabile.The growth is limited because of their relatively small seedlings number.The age structure of Tamarix taklamakanensis population showed a ＂bell＂ shape curve,and it showed similar stabile population characteristics.Bing of the very small number of seedling and the larger proportion of middle age class plants,the development of the population will tend to decline.The age structure of Populus euphratica population has a certain peculiarities and showed a reverse ＂S＂ curve.The proportion quantity of middle class and older class plants maintained certain stability,and the large quantity of the small class plant make population has increasing potential.Their own age structure characteristics of three typical populations made them face the different degree threats of survival.So it is necessary to take different protection measures to maintain the population structure＇s stability and development.
出处
《西北植物学报》
CAS
CSCD
北大核心
2011年第11期2304-2309,共6页
Acta Botanica Boreali-Occidentalia Sinica
基金
国家科技基础性工作专项(2006FY110800)
甘肃省自然科学基金(0803RJZH087)
国家自然科学基金(40961013)
关键词
种群年龄结构
梭梭
沙生柽柳
胡杨
年龄锥
库姆塔格沙漠
population age structure
Haloxylon ammodendron
Tamarix taklamakanensis
Populus euphratica
age pyramid
Kumtag desert
