珍贵树种—裂叶榆育苗技术的研究^*          下载免费PDF全文

邹学忠  阎忠林 《林业科学研究》1992,5(2):182-187

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杉木间伐小径材材性试验研究   总被引：7，自引：0，他引：7  

洪成器  苏伟毅 《福建林业科技》1992,19(4):6-13

杉木间伐小径材材性试验结果与成材杉木比较:密度小,晚材率较低,生长较快,吸水性较强;材质为未成熟幼林材种,物理性质较差,力学强度有所降低,作为建筑结构用材时,在设计与施工中必须注意到其强度的降低,采取必要的措施。杉木间伐小径材纤维长度与成材相似,纤维宽度略宽、纤维长宽比值略小,但尚为良好的纤维原料。  相似文献   

Preliminary studies on the early quality identification ofAuricularia auricular     

Li Ling  Ding Jun-nan  Luo Li  Zou Li  Wang Xiang-li  Zhang Gui-hua 《林业研究》2005,16(1):61-64

In production industry ofAuricularia auricular, the varieties quality is most important impact factor on output. For evaluating the early quality of the edible fungus, 9 varieties ofAuricularia auricular (Au9, CF09, CF05, 29, 916, chang10, chang7, Au.Japanese and 8808) were cultured on the medium consists of potato dextrose agar (PDA) and sawdust to test their mycelium growth rate, endurance to high temperature, resistance to mildew, assimilation of nutriment, and resistance to drought. The result showed that the mycelium of Chang 10, CF09, 29 and Au.Japanese varieties had the eminent characteristics such as short lifespan, stronger assimilation of nutriment, and endurance to high temperature and steady growth. These four varieties are determined as superiority varieties ofAuricularia auricular in accordance with the research results. Foundation item: The research was supported by Science Fund of Northeast Forestry University (2004). Biography: Li Ling (1964-), female, Engineer in Northeast Forestry University, Harbin 150040, P. R. China. Responsible editor: Zhu Hong  相似文献   

Evaluation of the level of threat and protective classification of the vegetation of Makehe Forest in Sanjiangyuan Nature Reserve, west China     

Dalin Zou  Youjun He  Qinwen Lin  Guofa Cui 《Frontiers of Forestry in China》2007,2(2):179-184

After investigating and studying the vegetation, we have established that Makehe Forest, in Sanjiangyuan Nature Reserve, Qinghai Province, is host to a total of 364 different species, representing 173 “genera” in 55 different vegetative families. We propose five quantifiable indices for evaluating the level of threat to these plants: 1) the distribution frequency of the “line transect”; 2) the distribution frequency of sample plots; 3) the distribution density inside sample plots; 4) the existing abundance in the forest region; and 5) plant fidelity. The results show that there are two endangered species, six vulnerable species, 12 nearly threatened species and 344 safe species. The study tried to evaluate the urgency for conserving these plants, according to coefficients of closeness to disappearance, of genetic loss and of usefulness. Results also showed that the number of species of primary concern is two; of secondary concern, nine; of the third level, 23; and of least concern, 330 species. __________ Translated from Journal of Beijing Forestry University, 2006, 28(3): 20–25 [译自: 北京林业大学学报]  相似文献   

银杏雄株开花生物学特性的研究   总被引：17，自引：0，他引：17  

邢世岩  有祥亮  李可贵  樊纪欣  董金伟 《林业科学》1998,34(3):51-58

对从泰安和郯城共５０５０株银杏雄株中筛选出的２６个优良单株的开花生物学特性进行了研究。这些单株具有花期长、花粉量大及花粉生活力强等特点。相关分析和方差分析结果表明,随海拔高度的增加,花期逐渐延长,但小孢子叶球数／短枝下降。每米长枝上的短枝数最高达４５个。短枝长与小孢子叶球数／短枝呈极呈著的正相关。３年生枝段短枝开花率最高,达９６％。每个短枝上小孢子叶球数最高达６４５个,每个小孢子叶球最多含花药５８个,每个花药含有花粉粒最高达２３×１０４个,平均每个小孢子叶球含花粉粒达６５×１０４个。１４＃单株出粉率达６８３％。一株４５年生雄株可产花粉１６５ｇ。花粉生活力平均为９２％。授粉后座果率９０％,有胚率９１％。  相似文献   

The Asian Wapiti (Cervus elaphus)     

Zou Hongfei  D. Bruce Banwell 《林业研究》1996,7(4):46-48

The authors visited some deer farms in Northeastern China in 1991 and 1993. The seven subspecies of Asian Wapiti (Cervus elaphus) were detected by observing the animal’s appearance and analyzing the video information. The status of taxonomy research in China was also discussed.  相似文献   

A COMPARATIVE STUDY BETWEEN FAUNA OF HEILONGJAING(CHINA)AND ALBERTA PROVINCE(CANADA)     

Gao Zhongxin Gao Erhu ZouHongfci JinKun SuJinbaoNortheast Foresty UniversityJiang ZhigongAlbeta University  Canada 《林业研究》1993,4(1):64-68

Heilongjing(China)and Alberta(Canada)provinces are situated at the same lati-tude,with similar nature conditions.Mammals in Alberta account for 87 species and in Heilongj-ing,97 spesics,among which a number of orders,families and species are in common.Continentsof Eurisia and North America histoi cally were connected and separated for several times,sothere are a number of animal forms in common,among them the similarity of herbivores is rath-er high.The similarity index of cervidae is 0.54.Other orders with comparatively similarcompiosition are Insevtivora,Chiroptera and Lagomorpha.In two orders,there are no commonspecies.In these two regions,duc to historical reasons,a number of specific genera and specieswere formed.  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   

内蒙古可持续发展指标体系设计及评价方法研究   总被引：2，自引：0，他引：2  

邹积君  藏克冰  刘贵富  刘继先 《森林工程》2002,18(6):9-10

通过对内蒙古可持续发展评价指标体系和方法的初步研究，设计出了包括可持续发展综合指数1个目标层、人口状况等5个准则层和人口自然增长率等28个评价指标的层次性指标体系，并利用均方差权数决策方法，对区域可持续发展进行全面分析和定量评价。  相似文献   

Nutritional Composition of Iron,Zinc, Calcium,and Phosphorus in Wheat Grain Milling Fractions as Affected by Fertilizer Nitrogen Supply     

Yan‐Fang Xue  Wei Zhang  Dun‐Yi Liu  Hai‐Yong Xia  Chun‐Qin Zou 《Cereal Chemistry》2016,93(6):543-549

Fe and Zn deficiencies are global nutritional problems. N supply could increase Fe and Zn concentrations in wheat grain. This study was conducted to determine the impacts of different N rates (0, 122, 174, and 300 kg/ha) on the distribution and speciation of Fe and Zn in wheat grain milling fractions under field conditions. Zn and protein concentrations were increased, whereas Fe was less affected in the flour fractions with increasing N rates. Further analysis with size‐exclusion chromatography coupled with inductively coupled plasma mass spectrometry revealed that Fe and Zn bound to low‐molecular‐weight (LMW) compounds in the flour fractions (probably Fe‐nicotianamine [NA], Fe‐deoxymugineic acid, or Zn‐NA) were less affected by increasing N supply, representing 3.5–10.9% of total Fe and 2.5–56.6% of total Zn. In the shorts fraction, LMW‐Fe was absent, and LMW‐Zn with higher N supply was over twice as high as that in control and 3–27 times as high as that in the other milling fractions. In the flour fractions, the molar ratios of phytic acid (PA)/Fe and PA/Zn (both less than 30.5) decreased, whereas soluble LMW‐Fe/Zn was not affected with increasing N rates.  相似文献