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不同家系枫香苗木质量评价 总被引：1，自引：0，他引：1
通过对76个枫香家系苗木所观测的13个品质指标(总干重、茎干重、茎鲜重、根鲜重、叶面积、叶干重、叶鲜重、根干重、地径、总鲜重、苗高、侧根数、主根长)进行因子分析，将13个品质指标综合为少数相对独立的质量因子，从而较好地反映了各个不同枫香家系间苗木质量的差异。 相似文献
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马尾松改良代种子园不同家系苗期生长差异分析 总被引：2，自引：0，他引：2
以马尾松(Pinus massoniana)桐棉种源改良代种子园15个优良家系苗木为材料,研究不同家系在9个月培育期间,苗高、地径、根系以及生物量之间的生长规律及差异,以及营养杯对苗木生长的影响。结果表明,所有家系苗期生长均表现为"慢-快"趋势的生长规律,家系间种子发芽率、苗高、地上干鲜重、总干鲜重、地上干重达到极显著差异水平,家系间地径未达到显著差异,营养杯大小对苗木高度和长根系影响较大,综合选择20、28、31、40、42、49号为生长最优家系。 相似文献
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华北落叶松移植容器苗培育基质研究 总被引：1，自引：0，他引：1
为了给塞罕坝林区华北落叶松移植容器育苗提供适宜的基质配比方案,在塞罕坝机械林场第三乡林场苗圃内,以阔叶腐殖土、草炭土、牲畜粪肥、黄土等做基质原材料,对其7种配比的育苗结果进行了筛选。通过多重比较,研究不同配比基质对苗木生长的影响。结果表明:不同基质对华北落叶松移植容器苗的地径存在显著性差异,对苗高、茎根比、鲜重和干重之间的影响差异达极显著水平。在塞罕坝林区培育华北落叶松移植容器苗,基质配比以阔叶腐殖土60%、猪羊厮肥30%、过磷酸钙8%、硫酸亚铁2%为最佳。 相似文献
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《西部林业科学》2016,(3)
为详细了解云南松杂交育苗及苗期生长情况,对云南松51个杂交组合和19个半同胞苗木的苗高和地径生长性状进行了测定与分析,结果表明,38个云南松种内杂交种幼苗苗高与地径生长差异大部分达到极显著水平,有15个种内杂交种的苗高生长值超过了总体平均值,有18个种内杂交种的地径生长值超过了总体平均值;云南松种内杂交相同母本的不同杂交组合类别之间的苗高和地径生长差异大部分达到极显著水平,有11个类别杂交种的苗高和地径生长均显著高于半同胞苗木的生长性状;13个云南松与思茅松种间杂交种幼苗苗高与地径生长差异均达到极显著水平,有7个种间杂交种的苗高和地径生长均超过了总体平均值;云南松与思茅松种间杂交种的苗高总体均值约是云南松种内杂交种苗高总体均值的1.4倍,二者的地径生长均值基本接近;云南松与思茅松种间杂交相同母本的不同杂交组合类别之间的苗高生长差异均达到极显著水平,地径生长差异不显著,有4个类别杂交种的苗高和地径生长均显著高于半同胞苗木的生长性状。 相似文献
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氮磷钾配比施肥和激素处理对白枪杆生长的影响 总被引：1，自引：0，他引：1
《林业调查规划》2016,(3)
采用4因素4水平的正交试验设计,进行氮磷钾配比施肥和激素处理对白枪杆生长的影响试验。结果表明,氮肥对白枪杆苗高生长具有促进作用(sig.=0.0380.05),对地径生长的影响则不显著;磷肥和钾肥对白枪杆苗高和地径生长影响均不显著;激素处理对白枪杆苗高和地径生长影响也不显著。 相似文献
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大叶栎容器苗育苗期的施肥试验 总被引：2，自引：0，他引：2
在大叶栎容器苗的育苗期进行了氮、磷、钾3种元素不同配比的施肥试验,研究不同施肥配比处理对其苗木生长量、叶面积、叶绿素含量、生物量以及苗木质量指数的影响。结果表明:不同配比施肥处理的大叶栎容器苗苗木各项指标均存在显著性差异。氮、磷、钾3种元素的平衡施用对大叶栎容器苗生长的促进作用最大,为最优施肥配比,经过4次施肥后苗木的苗高、地径、叶面积、叶绿素含量、地上干重、地下干重分别是不施肥(对照)的205.2%、122.7%、375.3%、148.3%、240.7%、124.7%。 相似文献
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在福建省邵武市对16个家系苗高、地径、保存率及遗传率进行了分析。结果表明:香椿家系在4月中旬进入萌动期,展叶期在5月中旬,生长高峰期在6月初—9月底,11月中旬进入休眠期;香椿SM-15、SM-2家系苗高生长最快,SM-15家系地径增长最大,SM-2家系保存率最高,其他家系在苗高、地径及保存率差异未达到显著性水平;香椿不同家系苗高、地径及保存率的遗传率分别为46.62%、32.16%和44.56%,其生长性状在家系水平上受中等遗传水平控制。根据标准化值与方差分析,初步选出5个家系(SM-15、SM-2、SM-5、SM-9、SM-10)作为优良家系。 相似文献
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采用土壤保水剂复合基质法,研究草毯生产中土壤保水剂对卧茎景天的生长及生物量的影响,其结果表明:土壤保水剂处理对卧茎景天株高、地径的生长具有一定的促进效应,保水剂处理(1、2、3)与CK,总体上存在着显著差异;土壤保水剂处理对卧茎景天的叶绿素含量具有促进效应,处理1、2、3与CK之间差异达到显著水平;土壤保水剂处理对卧茎景天的生物量具有促进效应,不同处理与CK之间存在多样化的差异显著性;土壤保水剂处理对卧茎景天的光合速率、蒸腾速率和水分利用效率产生了不同的效应,处理(1、2、3)从总体上改变了卧茎景天光合速率、蒸腾速率和水分利用效率的日变化进程,影响了峰值和低谷值的出现,并使均值与CK相比存在显著差异。 相似文献
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Western red cedar (Thuja plicata Donn) seedlings were grown in a greenhouse and subjected to six nursery cultural treatments (long-day wet (LDW), long-day moderate (LDM), long-day dry (LDD), short-day wet (SDW), short-day moderate (SDM), and short-day dry (SDD)) during mid-summer. Seedling attributes were measured before fall and spring planting.Short-day and moisture stress treatments reduced shoot but not root growth, resulting in reduced shoot to root ratios. Fall tested LDW seedlings had a higher osmotic potential at saturation and turgor loss point than other treatments. Fall tested short-day seedlings had lower resistance to plant water movement. The LDW seedlings had the greatest new root growth in fall testing, while one of the lowest in spring testing. In the fall, LDW seedlings had the greatest net photosynthesis (Pn) at 25 °C root temperature, with all treatments having a similar decline in Pn as root temperatures decreased to 1 °C. In the spring, all treatments had a similar decline in Pn with decreasing predawn shoot water potential. Moisture stress and short-day nursery cultural treatments applied in mid-summer will not harden western red cedar seedlings for all potential field conditions.Spring, compared to fall, tested seedlings had two times the shoot and three times the root dry weight. Spring tested seedlings had a lower osmotic potential, maximum modulus of elasticity, relative water content at turgor loss point and greater dry weight fraction. Fall, compared to spring, tested seedlings had lower resistance to plant water movement and greater cuticular transpiration. In general, fall tested seedlings had more root growth than spring tested seedlings. Spring, compared to fall, tested seedlings generally had greater stress resistance. 相似文献
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《Scandinavian Journal of Forest Research》2012,27(4):322-328
Abstract Actual climate models for central Europe predict prolonged summer droughts. Knowledge on how the interaction between light and water availability affects regeneration will hence be of major importance. In an experiment carried out under controlled conditions, newly emerged beech seedlings were grown in pots with sand during 54 days. Three treatments applying three different light levels (2, 9 and 43% relative light intensity) were combined with two soil water treatments (control and drought). At the end of the experiment, seedlings were separated into leaves, stem and root and the seedlings’ dry mass, leaf area and stem length was determined. Low irradiance (2%) had a strong negative effect on dry weights of seedling components, leaf area and specific leaf mass. Drought clearly affected biomass partitioning for seedlings at high irradiance levels (43%). An interaction between irradiance and drought on biomass partitioning in beech seedlings was observed at medium irradiance level (9%). Within a wide range of light levels in the forests, both light and drought may affect biomass partitioning in young seedlings. 相似文献
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Three controlled water supply treatments were applied to 1-year-old peach trees grown in root observation boxes. The treatments were: I(0), growth medium maintained at 50% field capacity; I(1), water supplied when daily net tree stem diameter change was negative or zero for 1 day; I(3) as for I(1) except that water was applied after net daily stem diameter change was negative or zero for 3 consecutive days. Trees in treatment I(0) had the greatest mean daily first-order shoot growth rates, and trees in treatment I(3) had the lowest shoot growth rates. Because leaf production rate (apparent plastochron) of first-order shoots was unaffected by treatment, differences in shoot length were due to differences in internode extension and not to the number of internodes. Trees in treatment I(0) had a greater number of second-order shoot axes than trees in treatment I(1) or I(3). Furthermore, an increase in the rate of growth of the first-order shoot axis was associated with an increased tendency for branching (i.e., the development of sylleptic second-order shoots). Increased leaf length was also associated with more frequent watering. Trees in treatment I(0) had the greatest root lengths and dry weights, and this was attributed to a greater number of first-and second-order (lateral) root axes compared with trees in the I(1) and I(3) treatments. The extension rate and apical diameter of first-order roots were reduced by the I(3) treatment. The density of second-order roots along primary root axes was not affected by any of the treatments. 相似文献
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Effects of four N sources and two defoliation treatments on growth and nitrogenase activity of Gliricidia sepium (Jacq.) Walp seedlings were studied in a greenhouse. All nutrients were supplied in irrigation water to the sterile growing medium. The N sources were: (1) 100 mg l(-1) of N supplied as NO(3) (-) (high-NO(3) (-)), (2) 50 mg l(-1) of N supplied as NO(3) (-) and inoculation with Rhizobium spp. medium-NO(3) (-)), (3)100 mg l(-1) of N supplied as NH(4)NO(3), and (4) inoculation with Rhizobium spp without mineral N (N(2)). At 35 weeks after sowing, mean total biomass was 130.5, 50.5, 22.9 and 17.4 g seedling(-1) in the NH(4)NO(3), N(2), medium-NO(3) (-) and high-NO(3) (-) treatments, respectively. The root/shoot ratio was high in all of the N treatments (1.73-2.77) because the seedlings had big taproots. The medium-NO(3) (-) treatment completely inhibited nodulation, whereas seedlings in the N(2) treatment were profusely nodulated. At 32 weeks after sowing, groups of seedlings in the N(2) and high-NO(3) (-) treatments were subjected to 50 or 100% defoliation. Closed-chamber acetylene reduction assays of intact root systems were conducted to compare nitrogenase activity at 7, 14 and 28 days after defoliation (DAD). At 7 and 14 DAD, nitrogenase activity of completely and partially defoliated seedlings was about 10 and 60%, respectively, of that of undefoliated controls. At 28 DAD, nitrogenase activity of completely defoliated seedlings was twice the predefoliation value, whereas nitrogenase activity of partially defoliated seedlings was only 87% of the predefoliation value. Recovery of nitrogenase activity was strongly correlated with foliage regrowth in the completely defoliated seedlings, but not in the partially defoliated seedlings. Abundant belowground C and N reserves in the large taproot probably contributed to the rapid recovery from defoliation. Accumulation of belowground biomass may also improve defoliation tolerance of mature trees. 相似文献
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不同氮素施肥方法对尾巨桉苗期生长和光合生理特性的影响 总被引：2，自引：0，他引：2
采用3种不同的氮素施肥处理(平均施肥、直线施肥和指数施肥)对尾巨桉苗木进行施肥处理,结果显示：指数施肥获得的苗木苗高和地径均大于其他施肥处理;指数施肥下尾巨桉苗木的叶、茎、根和地上部分干质量和整株生物量均显著大于其他施肥处理,指数施肥获得了更多的苗木生物量;3种施肥处理下,指数施肥的苗木净光合速率 Pn、气孔导读 Gs 和蒸腾速率 Tr 均为最大值,且显著大于其他处理。因此,3种施肥方法中,指数施肥方法最利于尾巨桉苗木的生长和光合作用。 相似文献
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To clarify the physiological basis of productivity differences among rooted cuttings and seedlings of eucalypt species, relationships between morphology and water relations were examined in 4-month-old seedlings of Eucalyptus grandis W. Hill ex Maiden, E. urophylla S.T. Blake and E. cloeziana F. Muell. and in 4-month-old rooted cuttings of three E. grandis cultivars. Four-month-old seedlings had greater dry weights, lower leaf area/root dry weight (LA/RDW) ratios and lower shoot/root dry weight (S/R) ratios than 4-month-old rooted cuttings. For all cultivars of E. grandis, tall rooted cuttings, as defined by height at age 4 weeks, had greater dry weights by age 4 months and lower LA/RDW and S/R ratios than short rooted cuttings. There were differences in height growth, dry matter productivity and relative shoot and root development among cuttings of different E. grandis cultivars, but these differences were not as great as the differences between short and tall grades of the same cultivar and between seedlings and cuttings. Consistent with the differences in LA/RDW and S/R ratios, seedlings had higher daytime water potentials (Psi(x)) than cuttings, and tall cuttings had higher daytime values of Psi(x) than short cuttings. Differences in Psi(x) were also related to stomatal conductance (g(wv)), which was up to 300% greater in short cuttings than in tall cuttings. Among seedlings, those of E. cloeziana, which had the smallest dry weight at age 4 months, had the highest g(wv), whereas those of E. grandis, which had the greatest dry weight at age 4 months, had the lowest g(wv). Unlike seedlings and the tall cuttings, short cuttings lost turgor when subjected to drought. The differences observed in susceptibility to water stress may account in part for the associated differences in dry matter production. Xylem pressure potential and relative water deficit at zero turgor did not differ significantly among the types of plants studied, which suggests that differences in growth rates were not the result of differences in dehydration tolerance. 相似文献
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赤红壤表土育苗施石灰后施Ｐ、Ｚｎ、Ｂ对巨桉苗生长的影响＊仲崇禄关键词巨桉石灰施肥苗木对巨桉（ＥｕｃａｌｙｐｔｕｓｇｒａｎｄｉｓＨｉｌｅｘＭａｉｄｅｎ）苗营养研究国内外有些报道［１～５］，但未见有关对巨桉施石灰调整土壤酸度后再施肥的报道。热带地区的赤红... 相似文献
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1998年7月,利用非称重式蒸渗池种植单一种源的一年生黄檀种苗,研究在印度沙漠地区培养黄檀种苗的合理灌水技术参数。当各处理（W1、W2、W3、W4）的土壤水分含量分别降低到7.56%、5.79%、4.44%和3.23%时,通过灌溉使苗木生长保持在一定的土壤的水分状况,如36.2mm（W1）、26.5mm（W2）、20.2mm（W3）和18.1mm（W4）。结果表明,在36.2mm（W1）水平时,种苗的株高、冠径、叶数和叶面积达到最大值（p〈0.01）。在W1和W2处理中,虽然上述参数没有明显差异,但在W2处理中,种苗的每升水分利用率的生物量最大。在W3、W4和W5灌溉水平下,不利于提高种苗的株高、生物量和营养积累。在W2水平以下（5.79%）,土壤水分有效率能提高根系生物量占总生物量的百分比。但在W3和W4处理中,叶干生物量百分比下降,同时在W5处理中,茎干生物量百分比下降。在W5处理中,土壤水势达到-196Mpa,种苗才可以成活。在W3和W4处理中,土壤水分有效率的限额影响黄檀种苗的生长和生物量。在W2处理中,土壤水分有效利用率最高,种苗的生长和生物量达到最高值。因此,在壤砂土条件下,通过灌溉维持幼苗土壤水分含量在5.79%以上时,可获得较好的黄檀种苗的生长和生物量产量。 相似文献
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Scots pine (Pinus sylvestris L.) and silver birch (Betula pendula Roth.) seedlings were grown in containers filled with growth media based on medium-textured sphagnum peat, coarse perlite and fine sand. The seedlings were then planted into fine and coarse sandy soils in 2.2 l pots, which were subjected to two water-content treatments (only one for birch). After the seedlings had grown five weeks in a greenhouse, rooting into the surrounding soil and shoot growth were measured. Addition of perlite and sand to peat medium slightly affected rooting; thus suggesting minor effects on seedling establishment. However, nitrogen concentration of the seedlings varied between growth media and correlated positively with rooting into the soil. The particle size and water content of the soil affected considerably rooting of the seedlings. Seedling height at the time of planting did not affect rooting or shoot growth. The fact that the fewest out-grown roots occurred in the dry fine sandy soil, suggests that dry soil together with high strength and resistance to root penetration reduce rooting and water uptake by container seedlings most and may thus cause water and nutrient stresses to seedlings after outplanting. 相似文献
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The effects of pre-storage CO(2) enrichment on growth, non-structural carbohydrates and post-storage root growth potential of Engelmann spruce (Picea engelmannii Parry) seedlings were studied. Seedlings were grown from seed for 202 days in growth chambers with ambient (340 micro l l(-1)) or CO(2) enriched (1000 micro l l(-1)) air. Some seedlings were transferred between CO(2) treatments at 60 and 120 days. Photoperiod was reduced at 100 days to induce bud set and temperature was reduced at 180 days to promote frost hardiness development for storage at -5 degrees C for 2 or 4 months. Stored seedlings were planted in a growth chamber after thawing for one week at +5 degrees C. At 80, 120, 140 and 202 days, and at each planting time after storage, seedlings were harvested for growth measurements and analysis of starch and soluble sugar concentrations. Planted seedlings were assessed for bud break every two days and new roots > 5 mm long were counted after four weeks. Carbon dioxide enrichment increased root collar diameter and almost doubled seedling biomass, with the most obvious effects occurring after bud set. Stem height was affected only slightly and shoot/root ratios were not affected at all. Carbon dioxide enrichment increased the rate of reserve carbohydrate accumulation, but did not influence the final concentration attained before storage (accounting for 32% of seedling dry weight). Needles were the major storage organ for soluble sugars, whereas roots were the major storage organ for starch. Soluble sugars were not strongly affected by two or four months of storage, but starch was reduced by more than 50% in all plant parts. None of the CO(2) treatments had an impact on bud break or root growth potential. 相似文献