摘要
通过地上生长量、根系垂直分布和形态特征分析以及系统聚类分析,对11个树种在北京大兴沙地生长的适宜性进行了研究。结果表明:各树种的树高、直径、新梢生长量和相对生长以及根系长度、根系表面积、根系体积和比根长等指标均有极显著的差异(p<0.001)。其中,臭椿(Ailanthus altissima)、楸树(Catalpa bungei)细根分化极强,皂角(Gleditsia sinensis)、圆柏(Sabina chinensis)和栾树(Koelreuteria paniculata)根系分化能力较强,通过较高的土壤资源消耗体现抗旱能力;酸枣(Ziziphus jujuba)、沙枣(Elaeagnus angustifolia)和沙棘(Hippophae rham-noides)通过降低直径小于2 mm根系分化、提高直径2~5 mm和大于5 mm根系生长和分布深度体现出避旱特性;樟子松(Pinus sylvestris var.mongolica)则通过降低地上和根系生长体现出耐旱特性;果桑(Morus alba L.)和饲料桑(Morus alba L.)对沙地环境的适应性较差。
An experiment was conducted to study the adaptability of 11 tree species in Daxing sandy land in Beijing according to aboveground growth,root vertical distribution,and root morphological variation by means of systematic clustering.Results showed that tree height,diameter at breast height,shoot length,shoot relative growth,root length,root surface area,root volume and specific root length were obviously different among the eleven tree species(p〈0.001).Strong differentiation of fine roots was observed in Ailanthus altissima,Catalpa bungei,and relative strong differentiation of fine roots in Gleditsia sinensis,Sabina chinensis and Koelreuteria paniculata,indicating that these tree species were drought resistant by using more soil resources.The drought avoidance of Ziziphus jujuba,Elaeagnus angustifolia and Hippophae rhamnoides was observed by decreasing fine roots less than 2 mm in diameter,increasing medium roots 2-5 mm or more than 5 mm in diameter,and deepening root distribution.Pinus sylvestris var.mongolica was drought tolerant by decreasing the growth of aboveground parts and root system;while Morus alba trees exhibited poor adaptability to sandy land.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2012年第4期18-22,共5页
Journal of Northeast Forestry University
关键词
根系形态
新梢生长量
适应性
沙地
Root morphology
Shoot growth
Adaptability
Sandy land
