共查询到20条相似文献,搜索用时 109 毫秒
1.
以分别来自牡丹江地区产的人工栽培和野生鲜蕨菜样品,定期取样,检测不同蕨菜在不同的储藏条件和时间下,其亚硝酸盐含量的动态变化规律,并对其进行比较。结果表明,鲜蕨菜中的亚硝酸盐的含量随储存时间的延长,含量不断上升,在第9日后菜中的亚硝酸盐含量有一个明显的增加过程。长期保鲜的蕨菜要比新鲜蕨菜中所含亚硝酸盐量高。人工栽培菜和野生菜的亚硝酸盐增加趋势大体相同,但人工栽培菜中亚硝酸盐含量的增幅要略大于野生菜的增幅。 相似文献
2.
林间山地野生蕨菜人工栽培技术 总被引:1,自引:0,他引:1
根据蕨菜植物学特征和生长习性,我们对林地野生蕨菜进行人工栽培试验,表明蕨菜人工栽培必须做好选地、采根、栽植、肥水管理、采收与加工等技术,效果良好,且经济效益明显. 相似文献
3.
蕨菜具有较高的营养价值和多重药用功效,人工栽培蕨菜具有较好的经济效益和生态效益。本文从种根采挖培育、地块选择、田间管理等方面对蕨菜的栽培及加工技术进行了阐述。 相似文献
4.
对2种栽培条件下欧洲白桦优良无性系1/86、2/86和本地白桦的净光合速率、蒸腾速率及相关生理指标进行了测定.结果表明:在净光合速率方面,田间栽培和盆栽方式下的本地白桦明显高于1/86、2/86,而 1/86、2/86之间则没有明显差异;田间栽培下的3种白桦相应高于盆栽条件下的净光合速率.在蒸腾速率方面,田间栽培条件下的3个白桦品种之间没有明显差异;盆栽条件下的本地白桦显著高于1/86、2/86, 而1/86、2/86之间则没有差异;田间栽培下的1/86、2/86明显高于盆栽的蒸腾速率,而本地白桦在2种栽培方式下没有差异. 相似文献
5.
6.
7.
8.
蕨菜和薇菜都是蕨类植物,有性世代为孢子繁殖。人工栽培采用无性繁殖。国内尚未见栽培报导,在国外,日本有人栽培,曾发表过多篇文章介绍蕨菜的栽培技术。薇菜的栽培在日本也没有成功。 相似文献
9.
《经济林研究》2014,(1)
为给黑果枸杞的人工栽培提供理论依据,对野生状态和人工栽培条件下青海黑果枸杞的形态特征进行对比分析。结果表明,人工栽培与野生状态环境条件的差异明显造成黑果枸杞叶片、果实、枝条的形态变化。人工栽培的黑果枸杞与野生状态的黑果枸杞在纵径、横径、单果鲜质量3个指标方面均有显著差异,平均单果鲜质量比野生的增加0.12 g,是野生状态下的1.86倍,并使果实更加饱满。人工栽培的黑果枸杞叶长、叶宽、叶面积明显增大,这是生长条件良性变化导致叶的形态特征的响应与适应。人工栽培的黑果枸杞叶形指数和叶面积的增加,更有利于提高植物的光合效率。野生条件下黑果枸杞枝条短粗,刺多而密,人工栽培使枝条生长加快,棘刺减少,易于果实采收。 相似文献
10.
一、引言树木的表现型是遗传和环境共同作用的结果。表现型的好坏,除了遗传、环境这二个因素外,还存在着遗传型×环境的交互作用。这个交互作用是指树木遗传型对变化的环境条件的不同反应。同类树木栽培在不同的环境条件下,表现出来相对生长量的差异,主要是由于树木的遗传型×环境互作所造成的。 相似文献
11.
This study investigated the dynamic modulus of elasticity (DMOE) of wood panels of Fraxinus mandshurica, Pinus koraiensis, and Juglans mandshurica using the natural frequency measurement system of fast Fourier transform (FFT). The results were compared with the static
modulus of elasticity (E
S) tested by a mechanical test machine. The results show a significant correlation between E
S, transverse vibration DMOE (E
F), and longitudinal vibration DMOE (E
L). For all of these species, the correlation between E
S, E
F and E
L is more significant than the individual species, which indicated that the FFT method is universal. The correlations between
E
S and sample’s density (ρ) are significant, but the correlation coefficient of E
S and ρ is lower than those between E
F, E
L and E
S. The E
S of wood is more accurately tested by the analysis based on FFT measurement than by the estimation based on density.
__________
Translated from Scientia Silvae Sinicae, 2005, 41(6): 126–131 [译自: 林业科学, 2005, 41(6): 126–131] 相似文献
12.
Four regions of chloroplast DNA were sequenced as a prospective genetic marker to identify Japanese representatives of Cyclobalanopsis: Quercus acuta, Q. sessilifolia, Q. salicina, Q. myrsinaefolia, Q. glauca, and Q. gilva. We found that Q. gilva was distinguished from other species based on both the trnL-trnF and trnT-trnL intergenic spacers. The evidence shows good coincidence with the fact that Q. gilva has several peculiar morphological features distinguishable from those of other species. There was no difference in trnL intron and matK. Both trnT-trnL and trnL-trnF intergenic spacers are capable of being used as genetic markers to identify Q. gilva among Cyclobalanopsis species.Part of this paper was presented at the 48th annual meeting of the Japan Wood Research Society, Shizuoka, April 3–5, 1998 相似文献
13.
落叶松水浸液对胡桃楸幼苗生长的影响 总被引:3,自引:0,他引:3
YANG Li-xue 《林业研究》2005,16(4):285-288
A study was conducted to detect the effect of water extracts from different parts such as root, bark, branch and leaf, of adult larch, Larix gmelini, trees on growth of Manchurian walnut, Juglans mandshudca, seedlings and the allelopathy between the two tree species. Four concentrations (100 g. kg i, 50 g. kg^-1, 25 g. kg^-1 and 12.5 g. kg^-1) were prepared for each kind of extracts. Result showed that the water extracts with low and moderate concentrations accelerated the growth of collar diameter and increased biomass and root/shoot ratio of walnut seedlings. The water extracts from branches and barks with low and moderate concentrations accelerated the height growth of the seedlings, while those from leaves and roots slightly decreased the height growth of seedlings. The fact that application of water extracts of larch improved the growth of Manchurian walnut attributes possibly to the allelopathy between the two tree species. 相似文献
14.
15.
Wu Xingyin Zhang JinghuaForest Pest Control Quarantine Station of Archeng City of Heilongjiang ProvinceXiang Cunti Li Guisheng '''' Shao Zhongwen Liu Xiaoguang Ma LiyaNortheast Forestry UniversityZhang Xianwen Li Zhuo Xie Guicai Dang WenqiangArcheng Forestry Bureau of Heilongjiang Province 《林业研究》1991,2(2):7-16
The poplar bacterial canker caused by Erwinia sp is a serious disease spreading inmost parts of Northeast China,where poplars are cultivalted.The disease seriously infects thosepoplars belonging to section Aigeiros or the intersection hybrids of section Tacamahaca and section Aigeiros and their clones.Five fine poplar cultivars resistant to the bacterial canker have been ob-tained by screening tests.They are Lz_2(Populus simonii×nigra var.italica),A_(15)(P.×sp.)613(P.×sp.),A_(102)and A_(98)(P.simonii×sp.)T following chemicals are obviously effective,such as:50%DT germicide ,40% XF-136 and 10% C.C.M.A.or 12.5% ramphencol and 50,000 ppm/mlvalidamycin,with which the stems or roots can be watered. 相似文献
16.
C. Saint-Pierre 《Agroforestry Systems》1991,13(2):159-176
A review of agroforestry practices in one lowland and one highland community of Xishuangbanna [Yunnan, P.R. China] has been carried out. Multilayer homegardens and taungya for fuelwood in the lowlands, tea shaded by natural forest and shellac production in a swidden farming system in the highlands are described. The extention of these agroforestry systems in Xishuangbanna is analyzed.Farming systems are facing problems related to shifting cultivation and to a rapid development of rubber which induce a negative evolution of these agroforestry systems.New agroforestry patterns based on Chinese research work, with rubber trees or with shade medicinal plants, are in extension in villages and in state farms.
Résumé Un inventaire des systèmes agroforestiers du Xishuangbanna [Yunnan, R.P. Chine] a été réalisé: jardins à plusieurs étages et production de bois feu par système de taungya dans un village de plaine, thé à l'ombre de forêt naturelle et production de gomme-lacque dans un système d'agriculture sur brûlis dans un village de montagne.Les systèmes de production sont confrontés aux problèmes liés à l'agriculture sur brûlis, et au développement de l'hévéa. Il en résulte des évolutions négatives de ces practiques agroforestières.De nouveaux modèles agroforestiers, à base d'hévéa ou de plantes médicinales d'ombre, se développent dans les villages et dans les fermes d'état á la suite des travaux de la recherche chinoise.相似文献
17.
Shirugumbi Hanamanthagouda Manohar Poornananda Madhava Naik Nagella Praveen Hosakatte Niranjana Murthy 《林业研究》2009,20(3):268-270
The gymnemic acid contents in various organs of Gymnema sylvestre were investigated by High Performance Liquid Chromatography (HPLC) method. The results shows that the content of gymnemic
acid in various organs, obviously different, was 54.29, 31.66, 28.82, 27.67, 25.39, 20.56 and 1.31 mg·g−1 DW in shoot tips, flowers, nodes, leaves, internodes, roots and seeds, respectively. The highest gymnemic acid content (54.29
mg·g−1 DW) was found in shoot tip, 1.96 fold higher than that in leaves (27.67 mg·g−1 DW). Maximum quantity of gymnemic acid (35.39 mg·g−1 DW) was observed in the young leaves, which was 1.52 times higher than that in old leaves (23.07 mg·g−1 DW). The content of gymnemic acid in young, middle and old internodes was 26.47, 25.77 and 23.94 mg·g−1 DW, respectively, all lower than that in leaves (27.67 mg·g−1 DW), whereas the content of gymnemic acid in young, middle and old nodes was 27.96, 28.81 and 29.66 mg·g−1 DW, respectively, all higher than that in leaves. The study provides the scientific evidences for the rational development
and utilization of Gymnema sylvestre resources, since over exploitation of natural stands has caused depletion of these plants in nature.
Foundation project: This work was supported by University Grants Commission, New Delhi (No. 33-88/2007 (SR)) 相似文献
18.
[目的]为杨树高产低耗高效工业用材新品种选育筛选新种质。[方法]采用布雷金多性状综合评定法和模糊数学隶属函数值法,系统分析和评价北方型美洲黑杨种质生长及光、水分、养分等关键环境资源利用性状。[结果]表明:(1)种源间、种源内无性系间在生长、光合、水分和养分利用方面的差异显著或极显著。(2)总叶面积、成叶速率、暗呼吸速率、氮素转移率、生长旺期水分利用效率与北方型美洲黑杨胸径显著或极显著相关。(3)筛选出M6、Q1、Q5、M5、Q7、Q3、M3、Q9等高产型种质,M6、Q1、Q2、M5、Q5、M3、Q4、M2等高产高光效型种质,Q5、Q1、W9、M5、Q7、M6、M3、W2等高产高水分利用型种质,Q9、Q5、Q3、Q8、Q1、M10、Q7、I5高产高养分利用型种质。其中,Q5、M6、Q1、Q2、Q9等无性系兼具生长和对资源(光、水分和养分)的利用优势。[结论]北方型美洲黑杨遗传变异丰富,为优良种源和种质选择提供了依据;总叶面积、成叶速率、、暗呼吸速率、氮素转移率等5个与生长关系密切的指标可作为种质资源评价的可靠指标;筛选出的优良种质特别是综合表现最优的5个无性系是后续育种工作的有效资源。 相似文献
19.
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
20.
[目的]模式植物在木本植物中鉴定的许多重要调控因子家族在木本植物中出现了基因家族成员扩张,但ARRs家族作为细胞分裂素响应调节因子在杨树基因组中成员数量反而减少,其在木本植物中如何行使功能需要进一步研究。[方法]本研究通过生物信息学构建PtRRI启动子与GUS融合表达载体,检测植物激素处理后PtRRI表达量和检测PPtRRI::GUS转基因植株在生根过程中GUS信号等方法,对杨树PtRRI基因的组织特异性表达模式进行分析。[结果]表明:PtRRI在杨树根部、形成层、木质部表达量相对较高,PtRRI转录受6-BA激素诱导,与其在不定根发育过程中激素调控下的表达相一致。[结论]PtRRI基因可能参与杨树的次级生长。 相似文献