摘要
采用样方和称重法对陕西榆林沙区丘间低地（A），固定沙地阳坡（B），固定沙地阴坡（C），沙丘顶部（D），半流动沙地阳坡（E），半流动沙地阴坡（F）等6种不同生境沙地柏生物量进行了调查测定，用SAS软件对数据进行了分析。结果表明：（1）平均树高和物种丰富度是描述地上生物量的主成分，坡向是影响地上生物量的主导生态因子；不同生境间沙地柏地上及地上各器官生物量都存在显著性差异；不同生境生物量大小顺序为：E〉B〉F〉C〉A〉D，叶是地上生物量中最主要的组成部分；（2）不同生境间沙地柏根量无显著性差异，但不同土层、不同径级根量除3～5mm根系外其余均存在显著性差异；0～80cm土层是沙地柏根量居集最大的土层，占总根量的76．32％～97．83％，根径〈1mm的根量最大，平均占总根量的38．10％，根径为5～7mm的根量最少，平均占4．26％；（3）用茎枝量可间接反映根量的动态变化。
In this paper the biomass of Sabina vulgaris grown in 6 different habitats including concave dune（ A）, south-facing slope of fixed dune （ B ）, north-facing slope of fixed dune （ C ）, protruding dune （ D ）, south - facing slope of half moving dune（E）, north- facing slope of half moving dune（F） in the sand area of Yulin in Shaanxi province were investigated and determined by sampling and quantify method, the data were analyzed by SAS software. The results are as follows ： （ 1） The average tree height and species abundance are main elements to depict the above ground biomass, the slope exposure is primary ecological element to the influence of above ground biomass; there are significant differences among the above ground biomass and each organ in different habitats; the order of above ground biomass from large to small is ： E 〉 B 〉 F 〉 C 〉 A 〉 D, leaves are the main parts in the composition of the above ground biomass; （2） there arent significant differences among the root weights in different habitats, but there are significant differences among the root weights in each soil layer and each diameter except the root in 3 - 5ram;the weight is the largest in the range of 0 -80 cm soil layer, the we weight can be ight of the roots with diameter less than 1 mm is the largest of 5 -7mm is the smallest,only reaches 4.26% of the total indirectly reflected by stem as well as branch weight. Key words： Sabina vulgaris ; biomass ; habitat; Yulin reaches 76.32% - 97.83% of the total amounts, nearly reaches 38.10% of the total amounts,the amounts ; （ 3 ） the dynamic change of root weight can be indirectly reflected by stem as well as branch weight.
出处
《西北林学院学报》
CSCD
北大核心
2006年第4期18-22,共5页
Journal of Northwest Forestry University
基金
国家科技攻关计划"西部开发"重大项目(2004BA901A14)
关键词
沙地柏
生物量
生境
榆林
Sabina vulgaris
biomass
habitat
Yulin
