您要查找的是不是:
- Populus ussuriensis sapwood 大青杨边材
- The research shows that their changes were similar with those of Populus ussuriensis wood. The volume change from MDF to WCS mainly lies on the thickness change. 结果表明 :中密度纤维板在进行树脂浸渍和高温烧结过程中 ,其主要质量和体积变化规律与以大青杨木材为原料的情况基本相同 ,但中密度纤维板烧结成木陶瓷的体积变化主要在于其厚度变化
- Research on initial density of Populus ussuriensis plantations 大青杨人工林初植密度控制技术的研究
- Ecological and Physiological Research on VA Mycorrhizas of Populus Ussuriensis 大青杨VA菌根生理生态学研究
- STUDY ON THE FIXATION COMPRESSIVE DEFORMATION OF POPULUS USSURIENSIS IN THE TRANSVERSE DIRECTION BY HIGH TEMPERATURE STEAM TREATMENT 高温水蒸气处理固定大青杨木材横纹压缩变形的研究
- Populus ussuriensisn. 大青杨
- Sapflow and sapwood area of Populus euphratica with 60cm (DBH) were higher than 15 cm and 28cm (DBH), and its velocity was lower. 5月和8月胡杨液流量有相似变化规律,而且60cm胡杨液流量都远远高于28cm和15cm。
- The identity of Rhamnus ussuriensis J. Vass. 乌苏里鼠李的名实问题。
- Triploid clones of Populus tomentosa Carr. 三倍体毛白杨
- Populus alba L. var. pyramidalis Bunge. 新疆杨
- Sapwood contains xylem vessels, but not as strong as heartwood. 边材含有木质导管,但不如中心木质那样坚硬。
- The sapwood is yellowish with a hard and heavy heartwood. 边材微黄色,心材坚硬而且沉重。
- Heart sapwood distinction was not obvious, chestnut brown. 心边材区别不明显,材色栗褐色。
- Preliminary Study on Shoot-tip Culture of Pyrus ussuriensis Maxim. 南果梨茎尖培养的初步研究。
- Studies on Seedling Traits of New Clones of Populus tomentosa Carr. 毛白杨新无性系苗期性状对比研究。
- The Geographic Distribution and Origin of Populus L. 杨属地理分布与起源初探。
- Fig.1. Shoot primordia on the callus of Populus eupheratica. 对愈伤组织继代培养与不定芽再生的关系进行了研究,结果见图1。
- The narrow band of sapwood is very similar in colour to the heartwood. 边材的窄带颜色与心材非常相似。
- Oxygen delignification of populus kraft pu1p is studied. 进行了杨木硫酸盐浆氧脱木素的研究。
- We all know that the price of heartwood is higher than that of sapwood. 我们都知道,心材价格一向高于边材价格。