遂昌县板栗林修剪与施肥对比试验     

奚卫红  张文斌  叶扬成  李成惠  邱伟清 《林业科技》2019,(2):40-42

在遂昌县湖山村、湖方村、桥西村开展板栗林修剪施肥试验的结果表明,修剪和施肥对于板栗产量和效益有显著影响,在修剪并施肥、不修剪只施肥的处理下,板栗林产量分别提高35.65%和23.66%,经济效益分别增长9.95%和9.48%。  相似文献   

Mineralization of nitrogen from decomposing leaves of multipurpose trees as affected by their chemical composition     

P. L. Mafongoya  P. K. R. Nair  B. H. Dzowela 《Biology and Fertility of Soils》1998,27(2):143-148

 Nitrogen release patterns from seven leguminous trees were determined from 8-week laboratory incubations. The quantities of extractable NH₄ ⁺-N and NO₃ ^– released to the soil to which the leaves had been applied was determined at weekly intervals and was related to the initial N, polyphenol, and lignin concentration of the leaves. Cumulative N mineralized was not correlated to initial N, soluble polyphenol and insoluble tannin concentrations, but was correlated to lignin and neutral detergent fibre N (NDF-N) concentrations. The ratios of NDF-N : N (r=0.68 at P<0.05), soluble polyphenol : N (r=0.70 at P<0.05) and (lignin+polyphenol) : N (r=0.75 at P<0.05) were negatively correlated with N release. Total polyphenol content was not a useful predictor of N release, but the reactivity of the polyphenols as measured by their protein-binding capacity can be a useful predictor. In addition to measuring the concentration of polyphenols, their reactivity with proteins must be measured, in order to assess their role in regulating N release. The (lignin+polyphenol) : N ratio could be used to screen leguminous tree leaves for their potential to release N in short-term experiments. This would allow for rapid screening of a large number of trees without detailed and expensive field experimentation. Received: 30 June 1997  相似文献   

“冬芽定量”对“金魁”猕猴桃生产影响研究     

严玉平  陈葵  鄢帮有  冷建华  涂贵庆  李帮明 《中国果业信息》2012,41(5)

冬芽管理是猕猴桃树体管理的重要技术环节。适宜的高质量冬芽保留,可较准确预测果实数量,提高果实大小一致性。本研究在江西省猕猴桃主栽区奉新县的赤岸镇山口果园,以10年生“金魁”猕猴桃为研究对象,研究冬芽保留数量对果实生产的影响。试验设置4个处理,每个处理以贝为单位（bay, 四根水泥柱围成的面积,18 m2）,每处理冬芽保留量处理1约为400个、处理2约为450个、处理3约为500个、处理4约为550个,每处理3次重复。结果表明：1）4个处理的冬芽保留量不影响新梢萌发量;2）处理1成花量显著大于其他处理;处理1和2,花芽/冬芽显著大于处理3和4;3）单位新梢上成花量,处理2显著大于其他3个处理;4）4个处理中,挂果量和产量没有显著差异,冬芽保留处理1的果实更大,更均匀,小果和超大果比例更小,即单位面积能生产出更多符合市场需求的优质商品果。综合分析,在试验区立地条件和现有管理水平下,冬芽保留量在约450个,有利于提高猕猴桃种植者的经济效益。  相似文献   

截干对红松人工幼龄林侧枝生长的影响     

康迎昆  聂维良  邓贵春  李正华  郭成博  张海峰  李春明 《林业科技》2020,45(1):9-11

以红松人工幼龄林(10年生)为研究对象,开展不同截干处理的结果表明,红松截干(按比例、轮枝)对侧枝生长影响显著。1/3截干轮枝基径、轮枝长平均值最大值(11.08、1.022)分别比对照高出140.87%、354.22%;三轮截干轮枝基径、轮枝长平均值最大值(8.11、0.51)比对照高出298.52%、211%。1/3截干平均值(11.08、1.022)比三轮平均值(8.11、0.51)要大,1/3截干最好。  相似文献   

修剪措施对油茶枝条和叶片生长及营养元素的影响   总被引：1，自引：0，他引：1  

王开良  姚小华  申巍  龙伟  王毅 《东北林业大学学报》2016,(7):13-18

以优良无性系油茶纯林为研究对象,研究了不同修剪措施(1/2短截,1/3短截,1/4短截,1/5短截,对照(CK),整个生长季均不修剪,)对优良无性系油茶的影响。结果表明:短截措施促进新枝伸长和增粗,增加油茶株高、冠幅和主茎,同时也能增加油茶新生枝条含水率和比叶质量,其中以重短截(1/2短截)处理的效果最佳;1/2短截和1/3短截均能促进长度20 cm的新枝条生长,而1/4短截和1/5短截有利于10~20 cm的新枝生长;油茶地上部分各器官的生物量随着短截程度的增加,除了新生叶生物量以外,经短截处理后,油茶地上部分各器官的生物量均显著高于对照(P0.05),相同处理下均表现为多年生枝条和叶的生物量明显高于新生枝条和叶生物量,修剪强度越重,油茶地上部分生物量越大;不同短截处理后,油茶根系数量随着土层深度的增加呈一致的先增加后减少的趋势,相同土层深度下,不同短截处理后,油茶根系数量基本表现为CK1/2短截1/3短截1/4短截1/5短截,修剪强度减少了油茶的根系数量;而对于根系的水平分布,修剪强度越重,根系分布范围越小;修剪强度越重,其不同器官大量元素(N、P、K)质量分数越低,中量元素(Ca、Mg)、微量元素(Cu、Fe、Zn)质量分数越高,短截处理有利于油茶枝条及叶片中中量和微量元素的积累,但对其大量元素(N、P、K)的代谢积累不利。  相似文献   

Impact of mistletoes (Amyema miquelii) on host (Eucalyptus blakelyi and Eucalyptus melliodora) survival and growth in temperate Australia     

Nick Reid  Zhaogui Yan  Jim Fittler 《Forest Ecology and Management》1994,70(1-3):55-65

The damaging effects of mistletoes Amyema spp. on host eucalypts in rural Australia concern many landholders, but few data are available to evaluate mistletoe impacts or formulate management strategies. We used an experimental disinfection approach to determine the effects of a putative pest mistletoe, Amyema miquelii, on its two principal hosts, Blakely's red gum (Eucalyptus blakelyi) and yellow box (Eucalyptus melliodora), on pastoral properties in northern New South Wales. For each host species, pairs of nearby trees were matched for heigth, diameter at breast height, level of mistletoe infestation and distance to neighbouring trees. One tree per pair was chosen at random and all the mistletoes pruned. After 33 months all treated trees were still alive, but among control trees seven of 29 red gums and one of 20 yellow box trees had died. The difference in survival between treated and control trees was significant for red gum. Among surviving pairs of trees, treated trees of both species had significantly greater diameter increments and significantly more foliage than untreated trees. After 33 months, the average increase in relative host foliage biomass attributable to removal of mistletoes was 22% in red gum and 24% in yellow box, compared with untreated controls. The average increase in radial growth attributable to mistletoe removal was 55% in red gum and 49% in yellow box. Diameter increment was negatively and linearly related to mistletoe infestation level in control trees of both species. The differences between infected and disinfected trees in this experiment may underestimate the impact of Amyema miquelii on host growth because small amounts of host biomass were unavoidably lost during disinfection. In a separate experiment, loss of host biomass had a significant negative impact on diameter increment. Although the results indicate that control of serious Amyema miquelii infestation of individual trees will be worthwhile in terms of immediate host survival and higher growth rate, prudent long-term management may well allow for the loss of small numbers of farm trees to mistletoes when planning tree recruitment and utilisation.  相似文献   

果树修剪生理生态效应的研究进展   总被引：3，自引：0，他引：3  

白昌华  田世平 《河北农业大学学报》1990,13(2):94-98

本文以苹果树为主,分析了不同时期的果树修剪效应,概述了修剪对果树光照、树势、树体大小、根系生长、树体内部营养成分、微量物质、水分、果实产量和品质等方面的研究状况,并对果树修剪尚需明确的问题进行了讨论。  相似文献   

盆栽造型整姿方法     

星晓艳  李维 《林业勘查设计》2012,(2):102

盆栽是室内绿化装饰中最简单、最常见的形式,常用的造型整姿方法有单干树型整姿法、铁丝牵引式造型整姿法、编绞主干整姿法等三种方法。  相似文献   

不同修剪程度对紫薇新梢生长的影响     

郭俊强  宋建伟  刘俊年 《安徽农业科学》2012,(31):15310-15311

[目的]针对紫薇生产中存在的修剪粗放、不合理现象,为紫薇科学、合理的修剪提供依据.[方法]对紫薇进行了极重短截(4 cm短截水平),重短截(8 cm短截水平)和中短截(18 cm短截水平)3种不同程度的修剪试验.[结果]极重短截发枝数最少,重短截次之,中短截最多;极重短截的新稍长度最长,重短截和中短截的相差不多,没有显著性差异;新稍叶片平均数三者相差不大,没有显著性差异;而新稍叶片总数是中短截最多,重短截次之,极重短截最少.[结论]以4 cm极重短截对紫薇生长的影响最佳.此时平均新梢数量2.3个,新梢长度34.8 cm,新梢叶平均数20.0片.  相似文献   

杨树修枝新方法与修枝技术研究   总被引：2，自引：0，他引：2  

马永春 《安徽林业》2011,(1)

在分析现有3种主要杨树修枝方法的弊端的基础上,笔者成功探索了一种新的杨树修枝方法——年龄轮生枝法,在此基础上对杨树的修枝机理与必要性、修枝林分选择条件、修枝季节、修枝年龄与修枝对象、修枝质量标准、修枝工具等进行了新的研究,发现萌芽前一段时间是最佳的修枝季节。  相似文献