红豆树的育苗造林技术

红豆树Ormosia hosiei又称鄂西红豆树,为豆科红豆属的半常绿乔木.树高达30 m,胸径可达100cm.树皮灰褐色微纵裂,幼树皮绿色光滑,有明显的灰白皮孔.小枝绿色,一回羽状复叶,小叶片卵形或长椭圆形状卵形.5月开花,11月果实成熟.荚果、种子（红色）鲜红色,有光泽.为我国特有树种,主要分布于江苏、安徽、浙江、福建、湖北、湖南、四川、贵州、陕西、甘肃等省,散生于河边、山谷林中,海拔在400～650m之间.被列为国家二级重点保护植物.     

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。     

中国无忧树的引种试验

中国无忧树(Saraca.dives Pierre),又称无忧树、无忧花,系苏木科无忧花属常绿乔木,原产我国云南东南部、广东和广西南部以及越南、老挝。其树冠为椭圆状伞形,树姿雄伟;叶大翠绿,稍微下垂;花序大型,花期长,着花多而密,盛花期花开满枝头,红似火焰,有“火焰花”之称;株形与叶形飘逸,具有极高的观赏价值,是近年来在华南地区极为畅销的高档新优绿化树种。我场于2001年从广西引种此树种,在我市大力开展城市树种筛选的今天,有必要对该树种在汕头的栽培技术进行总结。1生态特性中国无忧树天然生长于海拔200～1000m的密林或疏林中,常见于河流或溪谷…     

中国无忧花在广州地区的生长及其育苗技术

文章介绍了中国无忧花的形态特征、生态特性、用途及其在广州地区引种的生长表现;总结了中国无忧花的营养袋苗和园林大苗的育苗技术;并提出了推广种植中国无忧花的建议。     

涨南红豆红锈病的发生与危害

海南省尖峰岭地区营造的5－6年生海南红豆行道树，严重发生了由红锈藻引起的红锈病，在500株幼树中，发病株率高达97.5%，Ⅲ-Ⅳ级病株率80％，病情指数75.5，导致部分叶片干枯或脱落，嫩枝枯死，树势衰弱，生长严重受阻。文章对该病的症状、病原、危害及发生规律进行了报道。     

淹水胁迫对南五味子和海南红豆幼苗光合特性的影响

对南五味子和海南红豆的1年生实生苗在不同淹水时间下的叶片的光合特性进行了研究。结果表明:随着淹水时间的持续,南五味子幼苗的净光合速率(Pn)小幅波动后升高,而气孔导度(Gs)、蒸腾速率(Tr)和胞间CO2浓度(Ci)先降后升,至淹水20 d时各指标均高于对照;海南红豆幼苗的Pn、Gs、Ci、Tr先降后升,至淹水20 d没有恢复到对照水平;2种幼苗的气孔限制值(Ls)均为先升高后下降;南五味子和海南红豆都有一定的抗涝性,前者具有更强的耐淹水能力。     

Allometry, biomass, and chemical content of Novel African Tulip Tree (Spathodea campanulata) Forests in Puerto Rico

The African tulip tree, Spathodea campanulata, the most common tree in Puerto Rico, forms novel forest types with mixtures of native and other introduced tree species. Novel forests increase in area in response to human activity and there is no information about their biomass accumulation and nutrient cycling. We established allometric relationships and chemically analyzed plant parts of African tulip trees to determine the concentration and standing stock of chemical elements (C, N, P, K, Ca, Mg, S, Mn, Al, Fe, Na), and ash. Trees ranged in diameter at breast height from 8 to 85 cm and in height from 8.8 to 28 m. The concentrations of N, P, K, and Ca in leaves of the African tulip tree were similar to those of the native pioneer Cecropia schreberiana and higher than those of mature forest tree species in Puerto Rico. The over bark wood volume of African tulip trees in nine forest stands where it was dominant ranged from 163 to 849 m³/ha. Aboveground biomass ranged from 60 to 296 Mg/ha, and N and P stocks ranged from 190 to 988 and 32 to 137 kg/ha, respectively. Novel forests on abandoned agricultural lands can store more biomass and elements than native and plantation forest stands of similar age.     

低温胁迫对海南红豆和南五味子幼苗光合特性的影响

对海南红豆和南五味子的1年生实生容器苗进行3℃的低温胁迫处理后,研究其光合特性的变化。结果表明:低温胁迫处理后,海南红豆和南五味子幼苗叶片的净光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)和气孔限制值(Ls)均下降,而叶片细胞间隙CO2浓度(Ci)上升。低温胁迫6 d后的海南红豆各项光合指标的变化幅度均比南五味子大,说明后者比前者更耐寒。     

干旱对南五味子和海南红豆幼苗气体交换参数的影响

对海南红豆和南五味子的1年生实生苗在不同强度干旱胁迫下的叶片气体交换参数进行研究。结果表明:随着干旱胁迫的加强,南五味子和海南红豆的净光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)和叶片水分利用率(WUE)不断下降,而胞间CO2浓度(Ci)为先下降后上升,气孔限制值(Ls)呈现先上升后下降;重度胁迫时海南红豆的Pn、Gs、Tr和WUE均比南五味子大,说明前者对干旱有更强的适应性。     

刨花楠、花梨木、乐东拟单性木兰嫩枝扦插繁殖试验

对刨花楠、花梨木、乐东拟单性木兰3树种当年生半木质化嫩枝采用不同生根促进剂及浓度的扦插试验表明:3树种的嫩枝扦插成活率、生根率、生根系数、生根数量及根长等生根性状均有显著差异,不同树种对各生根剂及浓度反应不一,3树种较佳的处理组合是:刨花楠:ABT3生根剂,浓度500 mg·kg-1,可使扦插成活率达56.7%,生根率达56.7%,平均根数为6.7条, 平均最长根长9.2cm;花梨木:IBA生根剂,浓度为100 mg·kg-1,可使扦插成活率达53.3%,生根率达53.3%,平均根数为4.6条,平均最长根长为14.2cm;乐东拟单性木兰:NAA生根剂,浓度为100 mg·kg-1,可使扦插成活率达76.7%,生根率达53.6%,平均根数为3.2条,平均最长根长为6.4cm.     

Variability in pod and seed traits of Pongamia pinnata Pierre ecotypes in North Karnataka,India

An evaluation of 30 naturally available candidate-plus trees(CPTs) of Pongamia pinnata was carried out to elucidate the genetic variability and relationship of pod and seed traits and progeny growth traits to select the best planting material with higher productivity. Significant variations were observed in pod and seed characteristics,oil content, and during the progeny trial studies. The highest values were found in 100-pod weight(410.4 gm)and 100-seed weight(195.92 gm) and the phenotypic and genotypic variance was found maximum in 100 pod weight(4364.71 and 4289.93) and 100 seed weight(813.8 and768.93), respectively. Estimates of the phenotypic coefficient of variance were higher than the genotypic coefficient of variance for all the pod and seed traits and progeny growth traits, which depict the predominant role of the environment. Approximately 99 % of broad-sense heritability was revealed in oil content, followed by 100-pod weight(98.28 %), and canopy growth(96.93 %). Pod thickness shows the highest genetic advance of 56.61 %,followed by pod width(53.43 %) and canopy growth(49.3 %). Pod and seed traits have proven a positive correlation between each other and with progeny growth traits,except a few negative values. Hierarchical clustering by Ward's minimum variance cluster analysis showed phylogeographical patterns of genetic diversity. K-means clustering revealed that trees from different geographical regions were grouped together in a cluster where as trees from the same geographical area are placed in a different cluster. Seven Pongamia ecotypes(GRP-8, 9, 13, 14, 18,28, and 29) are found superior in traits, namely 100-pod weight, 100-seed weight, oil content, germination rate,plant height, canopy growth, and collar diameter. The traits100-pod weight and 100-seed weight are highly correlated with the progeny growth traits and even have higher heritability and genetic advantages.