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在草坪的生长过程中,经常出现长势减弱、草坪衰退等现象,降低了草坪的生态、经济效益和观赏价值。本文从不同角度对影响草坪生长的因素进行了全面分析和研究,针对草坪生长不良的现象提出了改良建议,为提高草坪质量和观赏价值提供了理论依据。 相似文献
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延长草坪绿色期的研究 总被引：3，自引：0，他引：3
早春利用植物生长调节剂刺激草坪提前返青,在旺长期抑制其生长速度,减少养分消耗,增加营养物质的积累;在不同季节按氮、磷、钾的不同配比不同用量进行施肥;利用50%遮荫条件(或自然疏林),夏季降低高温、冬季减小昼夜温差,降低不利气候胁迫草坪失绿的强度,从根本上增强草坪的抗逆性,使试验草坪比常规管理草坪绿期延长50天左右。 相似文献
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通过对长治市草坪的调查研究,提出草坪养护管理过程中存在着管理粗放、病虫害严重、杂草丛生、草坪退化与斑秃明显等问题,并分析了影响草坪良好生长的自然因素和人为因素。最后提出了草坪建植及养护管的措施和建议,为提高长治市草坪的生长质量和管护水平提供依据。 相似文献
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草坪的养护主要包括浇水、施肥、修剪等内容，据测算，草坪修剪费用的占草坪管理直接成本费用3/5左右，因此，怎样使草坪少剪甚至不剪，是降低草坪养护成本的关键。多效唑的矮化机理主要是作用于叶片，通过叶片吸收抑制植株生长，叶片变短，节间缩短。草坪矮化剂（吉林市昌邑区花卉研究所生产）主要作用于植株根部，达到抑制草坪生长，减少修剪次数。1试验材料和方法试验地位于克拉玛依市朝阳公园内，为早熟禾与高羊茅的混播草坪。选用15%多效唑和草坪矮化剂两种试验材料喷施草坪，喷施药剂前修剪草坪，修剪平均高度5．５cm，每种试验材料分… 相似文献
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通过对一平浪林区云南松的林分调查以及树干解析,分析了林分的树高、直径生长过程,结果表明,云南松生长发育过程可划分为苗木生长初期.树高速生期、直径速生期、速生后期和成熟期5个生长阶段.前5年为苗木生长初期,5～10 a是林分开始郁闭.高生长明显加快,10～25 a期间,云南松直径生长量也开始达高峰期,需要加强抚育管理措施;25～45 a期间,直径旺盛生长,树高保持一定生长量,而材积生长量保持最大,其后云南松进入速生后期,生长渐趋于缓慢,但仍保持较高的生长量.表明云南松速生期较长,可作长轮伐期经营,是培育大径材的理想树种. 相似文献
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通过对暴马榆1年生播种苗生长进行定期观测,采用Logist曲线对苗高生长过程进行拟合,建立生长模型,经对生长模型进行计算分析,结果表明:暴马榆1年生苗高生长相关系数达0.994 369,拟合效果显著。1年生暴马榆播种苗高生长过程可划为生长前期、速生期和生长后期。生长前期约35d,苗木累积生长量为15.3cm,累积生长率为23%;速生期约48d,苗木累积生长量为40.8cm,累积生长率为61.3%;生长后期约38d,苗木累积生长量为10.5cm,累积生长率为15.7%。 相似文献
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在研究马尾松优良种源树高生长对不同磷投入水平遗传反应的基础上 ,进一步研究优良种源与磷环境有关的抽梢行为和机理。试验林按种源 ( 5个 )和磷肥两因素完全随机区组设计 ,设置磷不投入 (P0 )、低投入 (P1,10 0g·株 - 1钙镁磷肥 )和高投入 (P2 ,4 0 0g·株 - 1钙镁磷肥 ) 3种磷肥处理 ,3年生时的结果表明不同种源的抽梢次数与磷环境关系较小 ,年梢生长对磷投入的敏感性因种源不同而异。不同种源年梢长度对施用磷肥的反应可由其固定生长量和自由生长量的变化来解释。与磷环境有关的性状遗传分析显示 ,随着磷环境的改善 ,种源间抽梢长度和自由生长量的差异增加 ,而固定生长量的差异则减小 ,抽梢次数变化不大。磷环境不仅影响抽梢性状的遗传差异 ,而且影响抽梢性状间的遗传相关关系。低磷胁迫下 (P0 ) ,年抽梢长度与其固定生长量呈显著负相关(r=- 0 .6919) ,与自由生长量呈显著正相关 (r=0 .9914)。施用磷肥后 ,年抽梢长度仅与自由生长有关 ,固定生长和自由生长间不存在相互制约关系。 相似文献
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Felipe Crecente-Campo Paula Soares Margarida Tomé Ulises Diéguez-Aranda 《Forest Ecology and Management》2010
An individual-tree growth model was developed with data from 54 permanent plots of Scots pine (Pinus sylvestris L.) located in Galicia (northwestern Spain). The study involved two model fitting approaches, one considering constant growth and mortality rates in the period between two consecutive inventories, and another considering variable growth and mortality rates in the same period. The individual-tree growth model was based on annual basal area growth, height growth and survival probability. The model included variables from groups pertaining to tree size, competition and age. Weighted regression was used as a tool for dealing with missing height observations in model fitting. Evaluation of the model via simulation of growth and mortality in the period between inventories showed that the variable growth rate approach provided slightly better results than the constant growth rate approach. The final model was consistent with expected diameter growth, height growth, dominant height growth, stand basal area growth and reduction in number of stems per hectare. 相似文献
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《Scandinavian Journal of Forest Research》2012,27(1-4):55-66
In full‐sib families of Picea abies (L.) Karst. (Norway spruce) the dynamics of juvenile growth and the inheritance of the most important growth characters were analysed in six growth periods in climate chambers followed by two additional growing seasons in a nursery. The full‐sib families were of French and North Swedish origin including both within and between provenance crosses. All growth rhythm characters changed over time. For instance, number of days to budbreak increased, whereas days to budset decreased, as growth periods advanced. Concurrent with the changes in growth rhythm, free growth decreased with increasing age. Half of the total variation for different growth rhythm characters within a growth period could in most cases be explained by provenance effects. Early selection is, therefore, meaningful to reduce damage by frost and mortality. Furthermore, the actual distances between family means decreased substantially with increasing age, and the actual length of the shoot elongation period decreased from 31 days during the second growth period to 16 days during the sixth. We suggest therefore that selection together with some treatment in the nursery that alters the growth rhythm of the seedlings are the best ways to increase frost resistance. Tree height was influenced by a set of complex gene actions that changed over time. Provenance effects were important during the first two growth periods. Subsequently, non‐accumulative within provenance family variance took over. If this pattern holds true in general, juvenile selection for height growth in Norway spruce cannot be made as early as that for growth rhythm. 相似文献
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黄连木苗期年生长节律及其生物量分配规律 总被引：2，自引：0，他引：2
为给黄连木幼苗生产管理提供参考,在定期观测的基础上,研究黄连木苗期年生长动态、生物量积累与分配规律以及植物生长指标与生物量组分的相关性。结果表明:在整个苗期生长过程中,黄连木的苗高、地径、冠幅生长均呈现"S"型曲线,用Logistic生长方程和生长曲线能对其动态生长节律进行很好地拟合。结合实际测量值将黄连木1年生幼苗的生长过程分为4个阶段:出苗期、生长初期、速生期和生长末期。各指标速生期的生长量占其总生长量50%以上;黄连木1年生苗木的地上与地下部分生物量比例为1.78∶1.00;苗木生物量各指标中,地径与苗高、茎干质量、叶干质量显著相关,苗高与茎干质量、叶干质量显著相关,茎干质量与叶干质量极显著相关。 相似文献
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总结引种洛阳后萌发较晚的紫斑牡丹茎叶生长规律情况,结果表明,萌发期为3月上旬;7个品种紫斑牡丹的茎高、叶长和叶宽年平均生长量存在差异,表现出植株高矮和叶片大小的不同,但各指标的变化趋势基本一致。物候期比原产地提前30天。茎高生长起始时间早,速生期短,生长集中;叶生长的持续时间相对要长;叶宽生长的结束期更迟于叶长。3月12日-4月16日为这些紫斑牡丹茎生长高峰期,平均茎高生长量达23.56 cm;4月24日已完成茎高全年生长量,年平均生长量为23.99 cm。从3月下旬至4月中旬是叶片的迅速生长期,4月16日叶片大小定形,平均叶长、叶宽分别达到28.16 cm和23.80 cm。花期集中在4月16-26日,培育晚开新品种有重要意义。 相似文献
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在福建省顺昌县开展无患子播种育苗试验,重点研究了其苗期生长动态,掌握无患子在一年中的生长特性,研究结果表明:无患子实生苗的苗高生长高峰期在6月到9月,其中以7月到8月生长最快,生长量占总生长量的41.8%,进入9月后苗高生长放缓;地径增长旺盛时期在8月至9月,生长量占总生长量的20%左右。进入10月后,无患子实生苗的生长逐渐以增粗为主,11月后,苗高生长基本停止。复叶片数的变化趋势与苗高基本一致,即生长高峰期出现在7-8月间。11月后幼苗陆续落叶,进入休眠期,因此,复叶片数出现生长曲线出现回落现象。同时,单株最大小叶叶长和叶宽的增长高峰期也分别出现在7月和8月。无患子实生苗从8月上旬开始有单株萌发侧枝, 8-10月单株侧枝数增加较为迅速,11月后侧枝基本停止萌发。但侧枝基径和枝长的生长并未有明显放缓或停滞。说明,此时的地上部分物质积累主要用于侧枝的生长。 相似文献
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Provenance-specific growth responses to experimentally applied drought and air warming were studied in saplings of three European oak species: Quercus robur, Quercus petraea and Quercus pubescens. Four provenances of each species were grown in large open-top chambers and subjected to four climates: control, periodic drought, air warming or their combination in 3 subsequent years. Overall growth responses were found among species and provenances, with drought reducing shoot height growth and stem diameter growth and air warming stimulating shoot height growth but reducing stem diameter growth and root length growth. Differential growth responses in shoots, stems and roots resulted in altered allometric growth relations. Root length growth to shoot height growth increased in response to drought but decreased in response to air warming. Stem diameter growth to shoot height growth decreased in response to air warming. The growth responses in shoots and stems were highly variable among provenances indicating provenance-specific sensitivity to drought and air warming, but this response variability did not reflect local adaptation to climate conditions of provenance origin. Shoot height growth was found to be more sensitive to drought in provenances from northern latitudes than in provenances from southern latitudes, suggesting that genetic factors related to the postglacial immigration history of European oaks might have interfered with selective pressure at provenance origins. 相似文献