雷公藤和昆明山海棠形态变异的研究   总被引：8，自引：3，他引：8  

斯金平  阮秀春  郭宝林  许元科  黄文华 《浙江林业科技》2005,25(1):1-4

对雷公藤种质资源进行调查,建立种质资源收集库,定期观察雷公藤表型性状,研究形态标记的遗传变异,结果表明,雷公藤与昆明山海棠的叶片大小、叶背白粉、花序大小等主要分类特征存在显著的差异,但其变异是连续的,而且地理分布也是连续的;昆明山海棠、雷公藤均能适应长江流域的气候条件,但不同种源生长情况及主要活性成分含量存在明显的差异.雷公藤与昆明山海棠现行分类问题值得商榷,两者应属同一种植物,雷公藤与昆明山海棠的遗传多样性预示着遗传改良具有巨大的潜力.  相似文献   

Effect of water stress conditioning on morphology,physiology and field performance of Pinus halepensis Mill. seedlings     

Royo  Antonio  Gil  Luis  Pardos  José A. 《New Forests》2001,21(2):127-140

Five-month-old Pinus halepensis Mill. seedlings were subjected to 4 irrigation treatments for 8 weeks. After the treatments, morphological and physiologicalattributes assessed included height, diameter, dry weight, water relations parameters, and determination of N, P, K, soluble carbohydrates, and starch concentrations. The remaining seedlings were field planted. Survival and height growth were recorded forfour growing seasons after planting. The mostsignificant effect of irrigation was onmorphology. Increased irrigation lead toseedlings with significantly higher height,root collar diameter and shoot and rootbiomass. Starch and soluble carbohydrateconcentrations were also affected byirrigation. However, parameters derived frompressure-volume curves were not significantlydifferent among treatments, nor were N, P, andK concentrations. There were no differencesamong treatments for survival in the field,which was highly related to summer rainfall. Incomparison, absolute and relative heightgrowth showed some significant but minordifferences among treatments.  相似文献   

Germination and seedling growth of Quercus vulcanica: effects of stratification, desiccation, radicle pruning, and season of sowing     

Fahrettin Tilki  C. Unal Alptekin 《New Forests》2006,32(3):243-251

Effects of stratification, desiccation, radicle pruning, and season of sowing on Quercus vulcanica germination and growth were studied to identify optimum nursery procedures for artificial regeneration of this species. Following stratification (0, 2, 4 and 8 weeks), acorns were germinated, and acorn moisture content and germination performance were also determined at various times during desiccation. In early December unsprouted acorns were planted in containers, and in early April sprouted acorns, which had been stored in polyethylene bags at 4 °C, with radicles left intact or with radicles pruned back to 1.0 cm were planted in containers.Stratification for 2 and 4 weeks did not increase germination percentage but significantly increased germination rate. Germination percentage of the seeds dropped when the moisture content of the seeds was reduced by desiccation, and the critical minimum moisture content of the recalcitrant Q. vulcanica acorns was found to be 11–16%. Spring sowing of sprouted acorns altered the morphology the containerized seedlings and caused the formation of significantly more main roots, but resulted in significantly less shoot height and shoot dry weight. Spring-sown sprouted acorns had also a significant advantage over the fall-sown unsprouted acorns in seedling survival, and thus nursery personnel should not be concerned if acorns sprout before sowing.  相似文献   

料慈竹不同年龄纤维形态的研究   总被引：5，自引：0，他引：5  

夏玉芳  曾静 《竹子研究汇刊》1996,15(1):45-51

就贵州省赤水市料慈竹（Ｂａｍｂｕｓａｄｉｓｔｅｇｕｓ）０～４ａ５个龄级的纤维形态进行显微观测和系统分析表明，其纤维长度为２．１３～２．６９ｍｍ（平均２．４５ｍｍ），纤维宽度为１３．４２～１５．０６μｍ（平均１４．０９μｍ），长宽比历８～１８５（平均１７４），壁厚２．５２～６．４６μｍ平均４．８６μｍ），腔径２．１５～８．３９μｍ（平均４．４１μｍ），壁腔比为０．６～６．１７（平均３．２４）。通过方差分析后表明，除纤维长度和宽度外，年龄对料慈竹纤维形态有一定影响，表现在纤维壁厚度上，从０～１ａ有增厚，１ａ后相对稳定，至４ａ时明显增厚；纤维腔径相反，从０～１ａ腔径减小，至４ａ时明显减小。  相似文献   

蔷薇科植物上5种锈菌的形态学特征     

赵桂华  闵祥宏  丁贵银 《西部林业科学》2005,34(4):26-29

通过对采集到的病害标本作形态学比较,并对照有关资料,鉴定出寄生于南京地区蔷薇科植物的多孢锈菌属锈菌5个种,即:短尖多孢锈菌Phragm idium mucronatum(Pers.)Schlechtendal,蔷薇多孢锈菌P.rosae-multi-floraeD ietel.,山田多孢锈菌P.yamadanumH iratsukaf.,玫瑰多孢锈菌P.rosae-rugosaeKasai和少隔多孢锈菌P.pauciloculare(D ietel.)H.et P.Sydow。进而对这5种锈菌的形态学特征作了详尽的描述。  相似文献   

园林有害植物——五爪金龙   总被引：2，自引：0，他引：2  

李伟华  冯航 《广东园林》2007,29(6):37-39

五爪金龙(Ipomoea cairica)是旋花科多年生草质藤本植物,原产北美.它生长迅速,攀爬能力强,现已成为我国华南地区仅次于薇甘菊(Mikania micrantha )的草质藤本害草,对广州、深圳及粤东地区的公园绿地、风景林、人工林、果园、茶园、苗圃等造成了极大的危害.文章详细介绍了五爪金龙的形态特征、生物学特性和生态学特征、危害状况以及存在的问题,以期引起人们对该植物足够的警惕,并为有关部门对该植物进行科学有效地防范和治理提供依据.  相似文献   

图像分割技术在木材表面缺陷识别中的应用   总被引：3，自引：3，他引：3  

邹丽晖  白雪冰 《森林工程》2007,23(1):27-29

阐述了图像分割技术在图像处理及分析中重要意义,以及主要的图像分割技术。以木材表面缺陷为主要研究对象,利用微分算子边缘检测、最优迭代阈值分割及形态学方法针对具有代表性缺陷死节和虫眼进行分割处理。  相似文献   

数学形态学在木材表面缺陷图像分割后处理中的应用   总被引：1，自引：0，他引：1  

邹丽晖  白雪冰 《林业机械与木工设备》2006,34(12):40-42

介绍了数学形态学的基本思想和运算。针对木材表面缺陷图像分割效果不完善的问题,提出基于数学形态学的图像后处理方法,包括应用数学形态学的填充操作、形态滤波以及形态梯度边缘检测等。经实验验证,应用数学形态学进行图像后处理,增强了木材缺陷图像分割结果的可视性和准确性。  相似文献   

碱蓬和盐地碱蓬花粉形态研究及其在分类上的贡献     

宋百敏  宗美娟  刘月良 《山东林业科技》2002,(2):1-4

借助光学显微镜和扫描电镜研究了碱蓬属2种植物碱蓬和盐地碱蓬的花粉形态，并对不同生境条件下盐地碱蓬4变式的花粉形态进行了对比研究，研究结果表明：花粉粒外部形态成球形；大小在15.4-24.0μm之间；具有散萌发孔，萌发孔数量在46－55之间，萌发孔直径为3．1－5．4μm；花粉粒表面光滑，其上散布许多颗粒状小突起，萌发孔上亦有数目不等的小突起。以上数值在不同种间有较明显的差异，在盐地碱医宵同生态变式间亦有差异，但差异较小。这些细微的特性差异可为碱蓬属植物分类提供参考依据，是研究该属植物分类及生态的新资料。  相似文献   

毛竹材材性变异的研究   总被引：32，自引：2，他引：32  

马灵飞  马乃训 《林业科学》1997,33(4):356-364

通过对毛竹材纤维形态，组织比量、纤维素含量和基本的分析测定，研究了不同年龄、不同胸径、竹秆不同部位栲生性状的变异特点结果表明，竹材纤维长度主要受竹秆部位的影响，与年龄和胸径无显著相关，组织比量与年龄无显著相关，与胸径有一定相关；纤维素含量和基本密度与年龄、胸径、竹秆部位均有关系，从材性变异特点来看，经营培育小径级毛竹对制浆造纸更有利。  相似文献