二乔木兰、乐昌含笑、含笑、火力楠

落叶灌木或小乔木,高3～10cm。分枝低。芽被灰色绢毛;树皮灰色,嫩枝棕色,疏生圆形、白色皮孔。树冠卵形,疏散。叶互生,纸质,倒卵形或倒卵状椭圆形。长6～17（-22）cm,宽4～10（～14）cm,先端圆而具短急尖。基部宽楔形。全缘,边缘呈线状透明,网脉明显,腹面中、侧脉微凹而在背面明显凸起。花于枝顶单生,先叶开放;花被片6～9片,长10～15cm,外面紫红色,内面白色。     

白兰、黄兰

常绿乔木,高10～25m。树皮灰至灰褐色,平滑;嫩枝绿色,有托叶环痕和白色皮孔。树冠阔卵形至长圆卵形。叶互生,薄革质,披针状长椭圆形,长8～28cm,宽4～10cm,先端长渐尖,基部楔形或阔楔形,上面绿色有光泽,下面中侧脉凸起,对光看边缘有围以半透明的线圈,揉之闻有香气;叶柄长15～2．5cm,在其长1／3以下处有早落的托叶痕迹。花于叶腋单生,花被片10～12片,白色,带肉质,倒披针形,     

铁冬青、海南菜豆树

铁冬青（救必应）Ilex rotunda Thunb. 冬青科 常绿乔木,高5～15m。树皮灰色,皮层切开后由白色变浅蓝色;幼枝有钝纵棱。树冠伞状扁球形。叶互生,软革质,椭圆形,长4～9cm,先端短渐尖,基部近圆形或钝,上面深绿色,有光泽,背面中脉凸起,网脉不明显,鲜叶折断中脉有胶丝,全缘,对光看边缘呈线状透明。花单性,雌雄异株,总花梗约1cm,3～7朵排成伞形花序状聚伞花序,腋生或生于当年小枝上;花小,黄白色.芳香。核果球形,直径6～8mm,熟时红色花期4～5月;果熟期10～12月。     

半枫荷育苗及造林技术

半枫荷(semiliquidambar cathayesis)属金缕梅科常绿乔木,树可高达17 m,胸径可达56 cm;树皮灰色,不开裂,略粗糙;芽长卵圆形,略被短柔毛.叶簇生于枝顶,草质,卵状椭圆形,长5.5～12.5cm,宽3.3～6.2 cm,先端渐尖,基部阔楔形或近圆形,稍不等侧或为掌状3裂,或为单侧裂,侧裂片三角形向上举,中央裂片椭圆形,边缘具腺细锯齿,基出脉3条,两则较纤细,中央1脉复有侧脉4～5对;叶柄长2.5～4 cm.     

金花茶新种——崇左金花茶

崇左金花茶,常绿灌木、高达5米,树皮褐红色、嫩枝无毛、老枝褐灰色;叶革质、椭圆形、长8～11cm、宽3．5～4．5cm、先端纯渐、基部近圆形、叶面深绿色发亮、叶背浅绿色、两面均无毛,中脉两面突起、侧脉4～5对,边缘细锯齿、叶柄绿色、长0．4～0．5cm,无毛;花常单生或腋生,薄黄色、花径5～6cm、花瓣13～16辨、长椭圆形、长113～2．6cm、     

大花五桠果、秋枫、大叶合欢、南洋楹

常绿乔木,高10～30m。干直,树皮灰色,平滑;分枝低,幼枝具明显叶痕和硬毛,顶芽被棕色长绢毛。树冠广卵形或卯圆形。叶互生,革质,叶片倒卵状长圆形,长10～40cm,宽5～15cm,顶端钝,基部阔楔形,边缘有波状小锯齿,侧脉羽状整齐而近平展,通常有15～22对,在背面明显隆起,并被较密硬毛;叶柄长2．5～4．5cm,被锈色硬毛。总状花序顶生,有花2～4朵;花蕾球形,直径约4cm;花萼5片,肉革质,淡黄绿色;花瓣5片,黄色。倒卯形。长5．5～7．0cm,花冠直径12～15cm;雄蕊多数,淡橙红色;心皮熟时红色,     

坛果山矾扦插繁殖技术

坛果山矾(SymplocosurceolarisHance),山矾科常绿小乔木,高达7m。嫩枝带黄绿色,稍具棱,小枝紫褐色。叶薄革质,椭圆状卵形,长4～9cm,宽2～3.5cm,先端尾尖,基部楔形具尖锯齿,中脉在叶上面2/3以下微凹,1/3以上平,两侧脉网状凸起,侧脉细,4～6对,在离叶缘0.5～1cm处分叉网结;叶柄长5～8mm。总状花序长2～4cm,具花6～12朵,花序轴被灰黄色柔毛;花萼长约3mm,无毛;花冠长约4.5mm,5深裂;雄蕊40,花丝基部稍合生;子房顶端环状凸起,无毛,3室。核果绿色,坛形,长5～6mm,顶端有五角形凸起,宿存萼片稍内弯[1]。坛果山矾四季常绿,树冠优美,特别是其花极具…     

凹叶厚朴Magnolia officinalis subsp．biloba（Reh．et Wils）Law

木兰科木兰属植物。落叶乔木，高10～15m，枝无毛；顶芽圆锥形，粗大，长3～7cm，无毛。叶厚纸质，长22～60cm，宽15～25cm；顶端明显凹缺，基部楔形；叶背沿中脉被长柔毛。叶柄粗壮，长2．5～5cm，托叶痕为叶柄长的2／3。花顶生，花梗粗壮；花被9～12(16)片，肥厚，初为红色，后转白色。种子黑色，卵圆形，背部有不规则纵纹，腹面有一条凹槽。花期4—5月，果期10月。     

小叶榕气生根的培育

<正>小叶榕,桑科,榕属。常绿乔木,枝具下垂须状气生根,支持力强。叶椭圆至倒卵形,长4～10厘米,先端顿尖,基部楔形,全缘或浅波状、羽状脉,侧脉5～6对,革质,无毛。隐花     

杧果栽培技术

卡亡果（Mangifera indica linn．）别名芒果、檬果,属漆树科。为常绿乔木,喜光树种,树体高大,树高达25m,胸径2m左右,树冠浓密,枝叶搓之均有柱果香味。叶集生枝顶,长椭圆形至披针形,长10～20cm,宽2．5—5cm,全缘,中脉,侧脉两面宽起,网脉明显。花黄色,花期3-4月,芳香。核果大,卵形,椭圆形或肾形,稍扁,长10—15cm,宽3-4.5cm,成熟时黄色,中果皮肉质,肥厚,鲜黄色,味香,具纤维,果核扁,坚硬。     

Productivity of Pinus elliottii, P. caribaea and their F1 and F2 hybrids to 15 years in Queensland, Australia

Growth data are presented to 15 years of age from a genetic study involving factorial matings within and between P. elliottii var. elliottii and P. caribaea var. hondurensis, planted across three sites in southeast Queensland. Specific volume equations developed using the centroid method for each taxon/site combination as well as a generic (i.e. conical) volume equation, were used to estimate the mean annual increment (MAI) at 10 and 15 years of age. MAI estimated using the conical volume equation were downwardly biased by 18% in P. elliottii but the bias was less than 2% in P. caribaea var. hondurensis, and yielded different rankings of taxa at each site compared to the taxon/site specific volume equations. At all three sites, P. caribaea var. hondurensis and the F₁ and F₂ hybrids significantly exceeded the productivity of P. elliottii; however, differences between P. caribaea var. hondurensis and hybrid pine were generally small. Assuming a realistic contribution of the three site-types to the population of deployment environments, average MAIs for southeast Queensland were estimated as: 17.6, 23.0, 23.7 and 23.5 m³ ha^?1 y^?1 for Pee, Pch, F₁ and F₂ respectively.     

Radial variation of collapse,volumetric shrinkage,moisture conent and density in Eucalyptus regnans F. Muell.

Summary Examination of segmented increment cores from three trees of Eucalyptus regnans demonstrated radial variability as follows: collapse increased with distance from the periphery to about 85% of the radius where it commenced a precipitous decline towards the pith; total volumetric shrinkage increased to about 45% of the radius, gradually declined to 85% radius, then abruptly fell as with collapse; moisture content increased to about 75% radius and abruptly declined at 85–90%; basic density declined with distance from the periphery to about 75% radius, then showed a slight increase towards the pith; per cent saturation remained relatively constant from the periphery to about 90% of the radius, then abruptly declined. It is argued that compression failures in the fibre walls of the brittle heart core were responsible for the precipitous decline in collapse, moisture content and per cent saturation near the pith. Examination of data after separation by density into latewood and earlywood increments demonstrated that latewood tends to be more highly water saturated than earlywood. Similar levels of collapse for material of different densities and correspondingly different saturation values indicated that level of saturation was a more important determinant of collapse susceptibility in latewood than in earlywood.     

雷公藤二萜成分研究

研究雷公藤(Tripterygium wilfordii Hook．f.)根心部分的化学成分。采用硅胶柱色谱法进行分离,从其氯仿提取物中分得11个二萜化合物,经波谱分析化合物分别鉴定为：triptoquinonoeA(1),山海棠酸(2),triptoquine(3),异雷酚新内酯(4),山海棠素(5),雷酚萜甲醚(6),雷公藤内酯三醇(7),雷公藤酮(8),雷公藤甲素(9),tripterfordin(10),雷酚新内酯苷(11)。化合物11为新化合物。