共查询到10条相似文献，搜索用时 218 毫秒
1.
对位于河南省通许县试验点的16个泡桐无性系进行苗期测定的基础上，研究分析其苗期生长规律及生长参灵敏，结果表明，泡桐苗期年生长符合S型生长曲线，16个无性系185株苗木年生长进程平均为；地径生长速生始期为6月12日，此时生长速度为0.033cm.d^-1，生长量达1.08cm；7月16日达到全年最大生长速度(0.049cm.d^-1)，皮时生长量达2.57cm，8月20日生长量达到4.05cm。速生期6月12日至8月20日，持续69d，全年生长量5.l3cm。苗高速生始期晚于地径，为7月8日，此时生长速度为0.049m.d^-1，生长量达0.86m；7月27日达到最大生长速度（0.073m.d^-1)，此时生长量达到2.04m;8月15日生长量达到3.22m，速生期7月8日至8月15日，持续37d，全年生长量为4.09m，地径与苗高生长量均与各自的速生持续期及最大生长速度有极显著的正相关关系。 相似文献
2.
3.
通过对7个泡桐无性系苗期昼夜生长节律的研究,发现影响泡桐茎伸长速率的主要气象因子,早期与中期是气温和相对湿度,晚期是气温和光照;影响叶面积增长速率的主要气象因子,早期是相对湿度、气温和光照,中、晚期是气温和光照。叶面积增长速率、茎伸长速率在昼夜间呈双峰分布,高峰随生长时期而变化,主要分布在18:00-24:00和12:00-18:00时间区段内。不同无性系有不同的叶面积增长速率、茎伸长速率的变化类型。 相似文献
4.
WANG Baoping LI Jiyue SUN Zhiqiang WEN Ruijun QIAO JieZHOU Haijiang LI Zongran. Paulownia Research Development Center Zhengzhou P.R. China.College of Resources Environment Beijing Forestry University Beijing P. R. China 《中国林业科技(英文版)》2004,3(1):80-86
TreesgrowthregularityandtheirannualgrowthrhythmareusuallysimulatedandanalyzedbyRichardsequation(TangShouzheng,etal,1999;RichardsJ,1959;WangMingliang,etal,2000).However,previousstudiesonPaulowniaannualgrowthrhythmhavebeenlaidparticularstressonseedlingscultureandyoungplantletselectionofclonesbutlackofrelevantstudyonwoodcycles(ZhaoDaning,etal,1993;FuDali,etal,2001;ZhouYongxue,etal,1996).ThenaturaltrunkextensionanditsstraightnessofPaulowniaarerestrictedprodigiouslybycharacteristicsofpseudo-d… 相似文献
5.
为进一步选择伊犁州适生杨树无性系,采用随机区组试验,对8个杨树无性系1年生扦插苗进行苗高和地径的生长节律研究。结果表明:各无性系苗高和地径生长均为“S”形生长曲线,各无性系之间差异不显著;171、LX-1和TL-3的苗高年生长量均高于对照,分别为362.90、305.79和303.94 cm,较对照增加21.27%、2.19%和1.56%,TL-3和LX-1达到了显著水平,171达到了极显著水平;171、DX-08-8和TL-3的地径年生长量均高于对照,分别为2.26、1.93和1.92 cm,较对照增加36.90%、16.73%和16.33%,均达到极显著水平。无性系171和TL-3苗期在本地表现出较好的适应性,1年生苗年生长量均优于本地良种日本白杨。 相似文献
6.
泡桐丛枝病是影响泡桐生长的一种主要病害，种源试验表明在毛泡桐种源中，除甘肃平凉未见发病以外，其它种源均有病害发生。江苏南京、湖北十堰、黄冈、陕西商县和辽宁大连5个种源发病较重，病情指数超过30％；白花泡桐丛枝病发病率较低，自然分布区南部的种源很少见到丛枝病发生，分布区北部与毛泡桐分布区有重叠的种源，丛枝病发病相对较重。毛泡桐起源靠西的种源发病较轻，随着经度的增加，丛枝病发病有增大趋势；白花泡桐发病与种源经度无关，而与纬度相关明显，呈现出纬度越高，发病率越低，病情指数越小的趋势。泡桐品种间丛枝病发病率和病情指数差异明显，通过品种选择可以获得抗病优良品种。 相似文献
7.
[目的]为评价和选育优良楸树(Catalpa bungei C. A. Mey)无性系。[方法]本研究利用32个楸树无性系7年的生长测定数据,以分析其生长规律及早期生长过程。对各无性系的单株材积生长进行Logistic拟合回归分析。在此基础上,分析不同指标间的相关性并对32个无性系进行聚类分析。[结果]楸树无性系在不同年份(1 a除外)胸径、树高、单株材积差异极显著,说明楸树无性系间变异丰富。楸树单株材积变异系数最大(7.84%～35.56%),胸径次之(11.89%～17.29%),树高最低(6.91%～10.87%),无性系单株材积改良潜力较大。同时生长后期单株材积(0.75)和胸径(0.82)保持较高的重复力,意味楸树单株材积受遗传控制较强。利用无性系单株材积生长平均值,拟合了楸树无性系单株材积生长曲线的Logistic模型,估算的生长参数在无性系间具有较大差异。楸树无性系7年生单株材积平均年生长量呈"S"型曲线生长趋势,而连年生长量先上升后下降,在第5年达到高峰,截止到本次调查时还未达到数量成熟。相关性分析显示:楸树无性系单株材积生长量与最大生长速率(MGR)、线性生长速率(LGR)、线性生长量(LGI)极显著正相关。聚类分析结果表明:供试的32个楸树无性系分为4大类,其中第I类的楸树单株材积生长总量较大,且具有较强的后期生长潜力。[结论]不同楸树无性系的遗传变异丰富, 1-1、22-07、19-01、16-05、16-01、16-07等6个无性系生长潜力较高,可作为楸树的优良无性系进行推广。 相似文献
8.
Investigation was conducted to analyze the effect of management measures such as trunk cutting and fertilization on frost resistant capability of young paulownia (Paulownia sp. ) plantation which had been undergone heavy frost damage in early 2008 in southern China. Experimental sites were located in the Paulownia fortunei forest consisting of 2-poplar clonal plantations in Chaling County. Paulownia fortunei, treated by root planting, trunk cutting and fertilization was called 2B; the contrast was called 1B. The results showed that the tree height, DBH, height under branch and lateral branch diameter in 2B were, respectively, 19.19%, 11.36%, 180% and 13.8% higher than those in 1B. The number of lateral branches in 1B was 2.8 times that in 2B. The icicle pressure beared by 2B was only 60.21% of that in 1B. There was nearly no potential damage in the 9treatment plot with 98% of the plants in the freeze injury grade I. In contrast, 50% and 36% of the plants in the control plot were observed, respectively, in freeze injury grades II and Ⅲ. Based on the present investigation, it can to be concluded that the applied management measures are effective in enhancing the resistant capability of young poplar plantations to frost damage. 相似文献
9.
Field trials at three locations were used to evaluate survival and early growth of Paulownia elongata, P. fortunei, and P. × 'Henan 1' plants produced from seeds, shoot cuttings, and micropropagated shoots. One year after field establishment, trees produced by either vegetative propagation method survived with higher frequency and were taller and of greater diameter breast height than trees grown from seed. The influence of propagation method was more pronounced in P. elongata and P. fortunei than in P. × 'Henan 1'. Survival frequency was similar for each species/hybrid, but both species were taller than P. × 'Henan 1' across propagation method and site. Field site had a pronounced influence on tree survival and height. Species/hybrid differences were not detected at the site that promoted the greatest tree growth, but P. elongata outperformed P. fortunei and P. × 'Henan 1' at the two sub-optimal sites. Clones within species/hybrid produced through micropropagation differed in survival frequency, height, and diameter breast height. Under the conditions used for this study, Paulownia field survival and early growth in central North Carolina was improved by using P. elongata or P. fortunei produced by rooting shoot cuttings or micropropagated shoots. Significant variation among clones within these species demonstrated the potential benefit of identifying superior clones to improve first year field survival and growth. 相似文献
10.
为掌握人工诱导四倍体毛泡桐保持多倍体特性情况及毛泡桐截干再生特性,笔者以5a生四倍体及二倍体毛泡桐截干再生苗为材料,对截干再生苗的倍性、出芽数、生长速率、叶片特性、叶绿素含量及光合特性等进行研究.结果表明:四倍体毛泡桐截干再生苗能很好地保持其多倍体倍性,相对于二倍体来说,出芽数较少,生长较缓慢;气孔增大,气孔密度降低;... 相似文献