共查询到20条相似文献，搜索用时 78 毫秒
1.
2.
3.
4.
5.
6.
7.
赵一曼 《绿色中国(A版)》2008,(24)
农历十二月,老人们习惯称为腊月。据说秦始皇统一中国后,下令将每年十二月改称为腊月。而腊这一词到汉代才正式出现。之所以把农历十二月称为腊月,《祀记》上面解释:蜡者,索也,岁十二月,合聚万物而索飨之也。腊与蜡相似,祭祀祖先称为腊, 相似文献
8.
9.
园林植物通常指人工栽培的观赏植物,是提供观赏、改善和美化环境,增添情趣的植物的总称,有木本和草本之分,木本者称为园林树木或观赏树木,草本者称为园林花卉. 相似文献
10.
11.
12.
以2 a生金蒲桃(Xanthostemon chrysanthus)幼苗为材料,研究了全光照,50%遮阴,70%遮阴,90%遮阴4种遮阴处理对金蒲桃生长特性、生物量分配、光合生理变化的影响,结果表明:与自然光全处理对比,遮光极显著(P<0.01)地抑制了金蒲桃幼苗生物量的积累,遮光处理组叶片数量减少,叶生物量比下降,茎生物量比增加;光补偿点、光饱和点、暗呼吸速率和最大光合速率降低,光能利用效率低于全光照叶,强光下遮阴叶的净光合速率保持稳定.上述结果说明:遮阴处理后,金蒲桃在生长特性、生物量分配和光合参数上表现出对遮阴弱光的适应,表明金蒲桃是一种能广泛应用于各种光照条件的优良景观树种. 相似文献
13.
黄金蒲桃组织培养初步研究 总被引：5，自引：0，他引：5
以黄金蒲桃的茎段为外植体，研究不同质量百分比的氯化汞溶液、不同pH、不同季节取材和不同取材部位对外植体污染率和褐变率的影响，以及不同基本培养基，不同取材部位、不同质量浓度植物生长调节剂组合对芽诱导率和丛芽生长的影响。结果表明，氯化汞的最适质量百分比存0．1％～0．5％之间，最适pH为6．0，冬季取材较好，WPM和Anderson培养基对黄金蒲桃的芽诱导影响差异不大，茎段是比较理想的取材部位，培养的最适植物生长调节剂组合为0．5mg／L6一BA＋0．1mg／LNAA，其芽诱导率高达91．3％，每个茎段平均丛生芽数为3．2。 相似文献
14.
在福建南亚热带气候区开展金黄熊猫树引种试验,对其适应性和抗逆性进行调查分析。结果表明:金黄熊猫树适应性强、种植容易且萌芽力强、生长较快,在没有受冻或轻微受冻的情况下,幼树的生长速度与该树种在深圳种植的生长量相当,3 a生即可正常开花结实,且其具有较强的抗风性、抗旱和抗病虫害能力,但耐寒性有限,幼树可耐-1.5℃的低温。因此金黄熊猫树适合在福建南亚热带气候区极端低温不低于-1.5℃、海拔300 m以下的地段种植,但不宜在山谷、低洼等有寒流沉积的地段种植。 相似文献
15.
A new method of simultaneous determining Cu(II), Zn(II), Fe(II), Mn(II), Co(II) and Ni(II) with a single sweep polarography
was developed. The experiment condition was studied and the results show that the optimum base solution is that the residue
got from evaporating 25 mL mixed solution, 2.5 mL 1.0 mol/L ethylenediamine, 3.0 mL 1.0 mol/L ammonia-ammonium chloride, 5.0
mL 10 % sodium sulfite and 0.5 mL 0.5 % gelatin were mixed and diluted to 25 mL with water. Under the condition of this base
solution, the polarography wave shapes of the six cations are ideal and without overlap of the peaks. In this base solution,
Cu(II), Zn(II), Fe(II), Mn(II), Co(II) and Ni(II) in synthetic samples were determined with relative errors 0.4–9.4% and relative
standard deviations 0.8%-12.2%. Under this experiment condition, one fold of Pb(II), Cr(VI) and Mo(VI) do not interfere with
the determination for Cu(II). This method has been used to the simultaneous determination of the amount of the six cations
in the samples of soil and Beiqi Tea. The relative standard deviations were 0. l%-2.1% and recoveries were 93.5%-99.0 %. 相似文献
16.
17.
The effect of six plantation species in comparison to natural forest (NF) on soil organic carbon (SOC) and total nitrogen (TN) stocks, depth-wise distribution, biomass carbon (C), and N was investigated on plantations and cultivated lands on an Andic paleudalf soil in Southern Ethiopia. The SOC, N, and bulk density were determined from samples taken in 4 replicates from 10-, 20-, 40-, 60-, and 100-cm depth under each site. Similarly, the biomass C and N of the plantation species and understory vegetation were also determined. The SOC and N were concentrated in the 0- to 10-cm depth and decreased progressively to the 1-m depth. Next to the NF, Juniperous procera accrued higher SOC and N in all depths than the corresponding plantations. No evidence of significant difference on SOC and N distribution among plantations was observed below the 10-cm depth with minor exceptions. The plantations accrue from 133.62 to 213.73 Mg ha–1 or 59.1 to 94.5% SOC, 230.4 to 497.3 Mg ha–1 or 6.9 to 14.9% TBC and 420.37 to 672.80 Mg ha–1 or 12.5 to 20% total C-pool of that under the NF. The N stock under Juniperous procera was the highest, while the lowest was under Eucalyptus globulus and Cupressus lusitanica. We suggest that SOC and N sequestration can be enhanced through mixed cropping and because the performance of the native species Juniperous procera is encouraging, it should be planted to restock its habitat. 相似文献
18.
19.
两种卵蜂在舞毒蛾卵上的寄生动态 总被引：3，自引：0，他引：3
北京地区大蛾卵跳小蜂和舞毒蛾卵平腹小蜂在舞毒蛾卵上一年可以分别完成４－５代和２—３代。两种卵蜂对舞毒蛾的寄生率因采集时期不同而有差异，以８月采集的卵块寄生率最高。７月中旬至８月中旬采集的卵中大蛾卵跳小蜂的寄生率为２．２６—４．１８％。７月中下旬采集的，舞毒蛾卵平腹小蜂的寄生率为０．６４—０．６６％。大蛾卵跳小蜂当年羽化的占９９．３％，次年羽化的占０．７％。舞毒蛾卵平腹小蜂当年羽化的占８１．０％，次年羽化的为１９．０％。为保护两种卵蜂，人工采摘卵块除治舞毒蛾的最好时期是９月下旬至次年３月下旬。 相似文献
20.
This paper depicted the physiographic landscape features and natural vegetation situation of study area (the eastern Jilin
Province), and expatiates the definition, basic characters and its development of Ecological Land Classification (ELC). Based
on the combination of relief map, satellite photography for study area and vegetation inventory data of 480 sample sites,
a 5-class and a 15-class ecological land type map was concluded according to 4 important factors including slope, aspect,
vegetation and elevation. Ecological Classification System (ECS) is a method to identify, characterize, and map ecosystems.
The Ecological Land Type (ELT) was examined and applied initially in eastern Jilin Province.
Foundation item: This paper was supported by Chinese Academy of Sciences “100 people” project and the Open Research Station of Changbai Mountain
Forest Ecosystem.
Biography: XIAO Bao-ying (1974-), female, postgraduate in Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016,
P. R. China
Responsible editor: Zhu Hong 相似文献