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1.
NL——80106杨树早期施肥试验初报 总被引：2，自引：0，他引：2
在ＮＬ－８０１０６杨树林中进行早期施肥试验，结果表明：６种同价值不同种类的肥料和对照（不施肥）共７个处理，施肥２年后期胸径，树高生长量差异极显著，施肥增产效果依次是：复合肥〉尿素〉磷酸二铵〉大豆饼〉过磷酸钙〉硫酸钾，尤其是增施复合肥，尿素，磷酸二铵，大豆饼肥料，２年后林分蓄积生长量成倍增加，单纯施硫酸钾肥料对其胸径和树高生产比对照均无显著影响，施过磷酸钙肥料对胸径生长有显著影响而对其树高生长无显著 相似文献
2.
杨树林带施肥试验初报 总被引：4，自引：0，他引：4
在ＮＬ－８０１０５、ＮＬ－８０１０６杨树林带中进行五种同价值不同种类肥料的施肥试验。施肥３ａ后调查结果表明,施肥对上述两种树的单株材积,胸径,树高生长有明显的促进作用。施肥效果依次是：复合肥〉尿素〉磷酸二铵〉过磷酸钙〉硫酸钾。 相似文献
3.
对定植2年的桃花心木山地人工幼林进行6个处理的施肥试验,结果表明:施肥对桃花心木山地人工幼林林木的树高、胸径生长有一定的促进作用,但需N、P、K肥一起配合施。此试验最为合理的施肥配方是:G∶100g尿素+200g过磷酸钙+50g硫酸钾,能使树高生长量增加85.1%,胸径生长量增加84.91%;其次为:100g尿素+200g过磷酸钙+100g硫酸钾,能使树高生长量增加69.0%,胸径生长量增加71.07%,最差的施肥处理是:50g尿素+100g过磷酸钙,能使树高生长量增加36.3%,胸径生长量增加10.69%。 相似文献
4.
对定植3年的直干桉山地人工幼林进行5个处理和1个对照的施肥试验,结果表明:施肥对直干桉山地人工幼林林木的树高、胸径生长有一定的促进作用,但需N、P、K肥一起配合施,此试验最为合理的施肥配方是:150g尿素+200g过磷酸钙+50g硫酸钾,能使树高生长量增加75.4%,胸径生长量增加43.15%,最差的施肥配方是:50g尿素+100g硫酸钾,能使树高生长量增加12.3%,胸径生长量增加8.12%。 相似文献
5.
对定植3年的思茅松山地人工幼林进行5个处理的施肥试验,结果表明:施肥对思茅松山地人工幼林林木的树高、胸径生长有一定的促进作用,但需N、P、K肥一起配合施,此试验最为合理的施肥配方是:100g尿素+200g过磷酸钙+50g硫酸钾,能使树高生长量增加37.7%,胸径生长量增加29.8%;最差的施肥配方是:50g尿素+100g过磷酸钙,能使树高生长量增加10.8%,胸径生长量增加13.2%。 相似文献
6.
以杂交马褂木幼林为供试对象，进行不同肥料种类和施肥量试验。结果表明：追肥1a后，各施肥处理间树高生长量有极显著差异，以施洞氮复合肥0.25kg／株和马褂木无机专用肥0.25k∥株的树高生长量最大；追肥3a后，各施肥处理间树高生长量有极显著差异，胸径生长量没有显著差异，以施尿素0.25kg／株的树高生长量最大，胸径和树高生长量分别为3.09em和1.85m，比对照分别提高72％和111％。综合成本效益考虑，适合推广的肥料种类和施肥量依次为马褂木无机专用肥0.1ks／株、马褂木无机专用肥0.25k∥株和尿素0.25kg／株。 相似文献
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以杜仲中龄林为研究对象，采用“3 414”完全施肥试验，分析不同水平氮磷钾肥配施对杜仲树高、胸径和冠幅生长的影响，探讨适宜杜仲中龄林的最佳肥料配比。结果表明：配施氮磷钾肥能够促进杜仲树高和胸径的生长，胸径的生长量随着施肥年限的延长显著增加，施肥2年后增加量可达未施肥条件下的1.7倍，树高的生长量在施肥第1年最高，可达未施肥条件下的1.4倍，此后随施肥年限的延长增加量趋于稳定。不同水平氮磷钾肥配施对杜仲生长的影响存在差异，中等氮磷肥配施钾肥对胸径生长的促进作用最为明显，而中等氮肥配施磷钾肥更有利于树高的增加。 相似文献
10.
《福建林业科技》2015,(4):105-111
在云南省景谷县内,采用氮肥、磷肥、钾肥3种肥料对不同坡位的思茅松幼林开展配方施肥试验,结果表明:坡位影响思茅松幼林的生长,山中、山下的幼林比山顶的幼林生长量高,树高、胸径分别比山顶增加了21.5%~30.3%、30.5%~38.0%,均差异显著;较适宜的施肥方案为尿素250 g+钙镁磷400 g+硫酸钾100 g,施肥后思茅松幼林平均树高提高17%(约40 cm),平均胸径提高30%(约1 cm),差异均达显著水平,同时也提高了林地土壤速效磷107.6%、全磷57.9%和全钾6.8%,并有效减缓林地有机质、速效氮、全氮、速效钾等土壤养分的流失。仅采用氮、钾配比施肥或磷、钾配比施肥,树高和胸径提高较小。3种肥料中氮肥和磷肥对思茅松树高和胸径生长影响显著,钾肥影响较小。在培育思茅松人工幼林时,采用氮、磷配比施肥对其树高和胸径生长具有促进作用。 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.
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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.
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
13.
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
14.
Hitoshi Sakio 《Journal of Forest Research》2005,10(4):341-346
The effects of flooding on growth of seedlings were compared over a 7-month period (April–November) among six different woody species: Aesculus turbinata, Cercidiphyllum japonicum, Fraxinus platypoda, Pterocarya rhoifolia, Pterostyrax hispida, and Quercus mongolica var. grosseserrata. Flooding reduced the shoot length of F. platypoda, P. rhoifolia, C. japonicum, P. hispida, and Q. mongolica var. grosseserrata seedlings but did not affect that of A. turbinata seedlings. Among control seedlings, shoot elongation occurred once in A. turbinata and twice in F. platypoda and Q. mongolica var. grosseserrata; the other species continued to grow from April to August. Among the flooded plants of all species, shoot elongation occurred only once at the beginning of the growing season. On August 25, flooding significantly reduced the number of developed leaves as compared with control plants except for A. turbinata. In the flooded plants except for F. platypoda, leaf fall began on June 30; in controls, by contrast, the number of developed leaves increased until August 25. Flooding reduced the total dry weight increment in all species. The survival ratio of flooded plants after the experiment differed with species. All of the F. platypoda and A. turbinata seedlings survived the flooding treatment, while only 20% of P. hispida and 30% of Q. mongolica var. grosseserrata survived. Flooding seriously affected the growth of riparian pioneer species including P. rhoifolia, C. japonicum, P. hispida, and Q. mongolica var. grosseserrata. The effects of flooding on growth of the seedlings differed with the tree species because of differences in leaf-emergence pattern and physiological flood tolerance. The responses of tree seedlings to flooding reflected species habitats and growth patterns. 相似文献
15.
Takato Nakano 《Journal of Wood Science》2005,51(2):112-117
A new relaxation property is discussed on the basis of creep behavior of wet wood specimens pretreated with heating at various temperatures followed by quenching. The treated samples showed more marked relaxation than that of an untreated sample. The relationship between relaxation time and heating history was represented by an equation ln() = –(
f – k
1)T + [ln(
g) + k
2], where ln() is the logarithmic relaxation time of wet samples after quenching, T is the difference between the heating temperature and the glass transition temperature (T
g), ln(
g) is the logarithmic relaxation time at T
g, is a constant,
f is the coefficient of thermal bulk expansion, and k
1 and k
2 are constants. It was concluded from the analysis of experimental results that the change in the relaxation property caused by heating and the following quenching is due to the temporary free volume created by freezing of molecular chain motion of wood components, most probably lignin, during quenching.This work was presented at the 52nd Annual Meeting of Japan Wood Research Society, Gifu, April 2002 相似文献
16.
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
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Shuang-Huang-Lian (SHL), a traditional Chinese formula containing Lonicerae japonicae flos (LJF), Scutellariae radix (SR) and Forsythiae fructus (FF), is commonly used to treat acute upper respiratory tract infection, acute bronchitis and light pneumonia. Forsythoside A is one of the main active ingredients in Forsythiae fructus, a key herb in SHL. In the present study, effects of different compositions in SHL on the intestinal absorption of forsythoside A were investigated. The observations from in situ intestinal circulation model showed that A/%(h− 1) of forsythoside A in FF + LSF, FF + SR and SHL were all reduced greatly compared with that in FF. However, in pharmacokinetics study, Cmax and AUC0 → 1440 of forsythoside A all increased and T1/2 prolonged in SHL, FF + LJF and FF + SR compared with FF. The results indicated that the different compositions of SHL decreased absorption but increased bioavailability of forsythoside A, which may be related to its metabolism inhibited in intestine or liver. 相似文献
20.
In sahelian countries, parklands are very important for human populations from an economic point of view. Unfortunately, they are currently being threatened by pests such as Loranthaceae which are stem parasites. In Burkina Faso, six species of Loranthaceae have been identified and located geographically: Agelanthus dodoneifolius (DC.) Polh. & Wiens, Englerina leucardii (Engl.) Balle, Globimetula cupulata (DC.) Van Tieghem, Tapinanthus bangwensis (Engl. & K. Krause) Danser, T. globiferus (A. Rich.) Van Tieghem and T. ophiodes (Sprague) Danser. Agelanthus dodoneifolius is by far the most widespread in the country whereas Globimetula cupulata is strictly located in the southeast. A list of their hosts has been established showing: 154 species dispatched in 96 genera and 42 families. Among them, the most frequently parasitized families are the Caesalpiniaceae, the Combretaceae and the Mimosaceae. A biological cycle scheme showing the main phenological stages common to the six Loranthaceae observed in Burkina Faso is reported. Based on a review of the damage caused by Loranthaceae, pruning, chemical treatments, genetic selection of resistant individuals and biological control are suggested as possible control methods.This revised version was published online in November 2005 with corrections to the Cover Date. 相似文献