曼地亚红豆杉硬、嫩枝扦插效果初探

通过曼地亚红豆杉硬枝扦插和嫩枝扦插试验表明:当年嫩枝扦插的成活率比硬枝扦插的成活率高58.7%,嫩枝扦插的新枝生长量比硬枝扦插多长7.17cm,说明嫩枝扦插无论是成活率还是当年生长量均比硬枝扦插要高(多)。因此在实际工作中,曼地亚红豆杉进行无性繁殖时,应采用嫩枝扦插进行繁殖为好。     

雁北地区河滩地杨树扦插研究

对山西省雁北地区的杨树扦插苗扦插立地条件及扦插时间进行了试验,结果发现：好的立地条件对扦插成活率及生长量影响很大,在土壤条件比较差的河滩地,扦插时间延后于正常经验时间可大大提高成活率,获得良好的经济效益。     

激素处理对杨桐扦插生根的影响

通过杨桐扦插激素处理试验表明，NAA处理对杨桐扦插生根有极显著的影响，几种处理中，以100mg／L处理24h和500mg／L处理10S最好，扦插生根率分别达到85％和79．5％，比对照分别高出23．5％和18.0％。杨桐扦插生根属皮部生根型。     

滨海盐碱地柽柳扦插育苗试验报告

为选择合理的柽柳扦插育苗技术，在东营市中部和北部沿海地区进行了扦插育苗正交试验和对比试验。结果表明：插穗长度和粗度是影响扦插成活率和苗木生长量的主要因素，插穗长１５～２０ｃｍ、粗≥０．５０ｃｍ育苗效果较好。覆盖地膜可明显提高扦插育苗成活率和苗木生长量，且随土壤含盐量增加，效果越显著。同时，该文总结了用１年生扦插苗培养柽柳大苗的关键技术     

杉木无性系不同规格苗木造林对幼林生长影响的研究

将１年生杉木无性系扦插苗分为５种规格进行造林试验,研究不同规格苗木对造林成活率和幼林生长量的影响。经８ａ观测表明：苗木生长对造林成活率影响不显著,对幼林生长量则有显著影响。采用苗高３４根径０．６１ｃｍ以上的苗木造林,可显著促进幼林生长,有利于发挥无性系造林的经济和生态效益。     

不同品种杨树在不同土壤类型上生长状况分析

育苗试验表明,在文安县西部地区(土壤类型为沙壤质潮土),欧美杨107的扦插成活率和生长量均大于中林46杨、廊坊杨2号、荷兰3930.在文安县东部地区(土壤类型为粘质湿潮土),廊坊杨2号的扦插成活率和生长量均大于欧美杨107、大于中林46、荷兰3930.     

黑果枸杞温室扦插育苗试验

笔者以黑果枸杞健壮母树2年生~3年生枝为试材,通过温室扦插育苗试验,探索插穗采集时间和不同浓度的生长调节剂(GGR)对黑果枸杞温室扦插育苗成活率及生长量的影响。试验表明,黑果枸杞扦插育苗时春天采集插条成活率高;春天采集的插穗用浓度为150 mg/kg的GGR处理,可使成活率提高到74.0%,扦插黑果枸杞苗最高苗高为40 cm,最大地径0.36 cm.     

火炬松、湿地松、马尾松扦插苗造林试验及效果分析

对火炬松、湿地松、马尾松扦插苗造林成活率、幼林生长量、生物量、树冠结构与根系分布等性状的测试表明:3树种扦插苗造林的林木生长与实生苗造林一样,仍然显示速生高产的性状。其中马尾松对比试验表明,扦插苗的造林成活率、5年生林木树高、胸径、单株材积生长量比实生苗造林分别提高27 5%、14 1%、30 1%、85 7%。说明3树种利用扦插苗造林,发展短周期速生高产无性系林业是完全可行的。     

羯布罗香扦插育苗试验

通过开展不同基质的羯布罗香扦插育苗试验,结果表明:(1)用不同的基质进行羯布罗香扦插,苗木的成活率和生长量间都存在着显著差异;(2)在进行羯布罗香的扦插育苗时,基质的选择十分重要,羯布罗香扦插采用森林土为扦插基质生长量较大,增加育苗基质的孔隙度,能提高苗木的成活率。     

杨树扦插造林试验初报

利用在省内外推广应用的14个杨树种(品种)建立采穗圃,经过品种对比试验,初步筛选出生长较好的10个种(品种)进行直接扦插造林试验。通过对扦插造林成活率和树高、胸径生长量的统计分析,表明吉林杨、白林2~#杨、中荷64~#杨表现出优良的生长特性和适应性。     

湖南索溪峪自然保护区的木本植物区系研究

本文通过详细的植物类群调查和查阅大量文献资料,以种为单位对湖南索溪峪自然保护区的木本植物区系进行了研究,记述了武陵红淡、武陵松、短柄杨桐、索溪红果树和粉背旌节花等5个新分类群,指出了本区木本植物区系上的5个特点。并提出在将该区开放旅游的条件下,必须加强对森林资源进行保护的建议。     

杨桐人工栽培模式试验初报

在杉木林分、毛竹林分下进行套种杨桐和农田集约化栽培杨桐试验,栽培后第2年进行生长量调查,结果表明,3种模式下杨桐生长状况均良好,其中以农田集约化栽培模式生长最佳.     

生物防火林带混交复层结构与配置及适地适树试验研究

选择木荷，红花油茶，杨桐等树种，采用随机区组设计和简单机械设计方法，分别进行了不同树种，不同配置，不同立地条件的混交和复层结构的新建型，改建型防火林带试验研究，结果表明：木荷＋红花油茶；木荷＋杨桐１：１比例梅花型混交复层结构林带，是较理想的生物防火林带的结构模式，具有良     

Physiological basis of seasonal trend in leaf photosynthesis of five evergreen broad-leaved species in a temperate deciduous forest

The physiological basis of photosynthesis during winter was investigated in saplings of five evergreen broad-leaved species (Camellia japonica L., Cleyera japonica Thunb., Photinia glabra (Thunb.) Maxim., Castanopsis cuspidata (Thunb.) Schottky and Quercus glauca Thunb.) co-occurring under deciduous canopy trees in a temperate forest. We focused on temperature dependence of photosynthetic rate and capacity as important physiological parameters that determine light-saturated rates of net photosynthesis at low temperatures during winter. Under controlled temperature conditions, maximum rates of ribulose bisphosphate carboxylation and electron transport (Vcmax) and Jmax, respectively) increased exponentially with increasing leaf temperature. The temperature dependence of photosynthetic rate did not differ among species. In the field, photosynthetic capacity, determined as Vcmax and Jmax at a common temperature of 25 degrees C (Vcmax(25) and Jmax(25)), increased until autumn and then decreased in species-specific patterns. Values of Vcmax(25) and Jmax(25) differed among species during winter. There was a positive correlation of Vcmax(25) with area-based nitrogen concentration among leaves during winter in Camellia and Photinia. Interspecific differences in Vcmax(25) were responsible for interspecific differences in light-saturated rates of net photosynthesis during winter.     

杨桐等23个乔灌木树种抗火性能的研究

选择杨桐，木荷，马松等２３个树种，对其叶子与枝条的含水量，易燃干燥度时间，粗灰分含量，炭化灰化时间，单宁含量，粗脂肪含量诸理化性质进行测定分析，并采用多目标综合评定方法，评选出杨桐，日本珊瑚，柃木，木荷，杜英，红花油茶，柑桔，杨梅等１０余个抗火性能较强的树种，国开展生物防火林带的营造提供依据。     

Shoot growth patterns in saplings of Cleyera japonica in relation to light and architectural position

To gain further insight into crown development, the influences of shoot architectural position (branch order) and light environment on patterns of shoot growth of Cleyera japonica Thunberg (Theaceae) were investigated. Annual shoot length and light environment were positively correlated within same-order branches. Shoot length differed significantly among branch orders: shoot length was greater for the lower-order branches when light environments were comparable. Lower-order branches lengthened to a certain extent even if light availability was relatively low, whereas higher-order branches did not grow vigorously even when light availability was relatively high. Within same-order branches, branching was independent of the light environment of the shoot. Sylleptic shoot production differed significantly among branch orders, with most sylleptic shoots being produced on second-order branches. It is concluded that both light condition and architectural position of shoots must be considered when examining the mechanisms underlying crown development.     

紫金牛光合速率及其生理生态因子日变化研究

利用Li-COR6400便携式光合作用测定系统对紫金牛的光合速率日变化进行研究。结果表明:紫金牛叶片净光合速率日变化呈双峰曲线,最高峰出现8:00,次高峰出现在14:00,有明显的"午休"现象,非气孔因素是导致午休的主要原因。相关分析和回归分析表明,紫金牛光合速率的主要影响因子为气孔导度。紫金牛叶片光能利用率和水分利用效率随着光合有效辐射的增强而降低,说明紫金牛对弱光的利用能力较强。     

Influence of shoot architectural position on shoot growth and branching patterns in Cleyera japonica

The influence of shoot architectural position on shoot growth and branching patterns was examined in saplings of Cleyera japonica Thunb. (Theaceae), an understory, broad-leaf evergreen woody species. Shoot length varied with branching order and the vertical position of the branch in the crown. In the upper crown, shoot length decreased with increasing branching order, whereas in the lower crown, differences in shoot length among branching orders were not significant. These results demonstrate that it is important to consider not only individual shoots, but also the relationships between shoots in terms of their architectural positions when studying the development of crown architecture in trees. Shoot branching patterns also varied with branching order and the vertical position of the branch in the crown. In the upper crown, branching was mainly sylleptic. In the middle of the crown, mainly proleptic branches were produced. In the lower crown, there was little branching. The importance of these trends in shoot growth and shoot branching patterns in terms of carbon production efficiency is discussed.     

杜茎山扦插繁殖与栽培技术研究

采用不同扦插基质、不同扦插时间对杜茎山进行扦插繁殖试验,并在不同郁闭度环境下对杜茎山进行栽培试验,结果显示：以100％黄土做扦插基质,其扦插成活率最高,平均成活率达95％;50％营养土＋50％黄土次之,其平均成活率为85％;50％细沙＋50％营养土最差,其平均成活率仅为70％。扦插时间以10月扦插成活率较高,达94．5％;6月扦插成活率较低,为85％。杜茎山在郁闭度0．6～0．7的林下平均高88cm,平均地径0．423cm,生长较好;在郁闭度0．9的林下平均高仅22．5cm,平均地径仅0．33cm。