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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3~5 mm根系外其余均存在显著性差异;0~80 cm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<1 mm的根量最大,平均占总根量的38.10%,根径为5~7 mm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。
The sampling plots and gravimetric methods were used to analyze the lowland (Y) in the Yulin sandy area of Shaanxi Province, the sunny slope of the fixed sandy land (B), the shady slope of the fixed sandy land (C), the top of the dune (D) E) and shady slopes (F) in semi-mobile sandy land were investigated. SAS data was used to analyze the data. The results showed as follows: (1) The mean tree height and species richness were the main components of aboveground biomass, and the aspect was the dominant ecological factor affecting aboveground biomass. The biomass of various organs aboveground and aboveground showed significant differences The biomass of different habitats was in the order of E> B> F> C> A> D. Leaf was the most important component of aboveground biomass. (2) , But there were significant differences among the different soil layers and root diameters of different diameter grades except the 3 ~ 5 mm root system. The soil layer with 0 ~ 80 cm soil layer was the largest in the population of Sabina przewalskii, accounting for 76.32 % ~ 97.83%, root diameter <1 mm is the largest, accounting for 38.10% of the total root diameter, the root diameter of 5 ~ 7 mm is the least, accounting for 4.26% on average; (3) Reflects the dynamic changes of root volume.