【摘 要】
:
To explore differences in leaf morphology between Sapindus mukorossi and Sapindus delavayi,and how the environment might drive these differences,80 germplasm samples from the Sapindus germplasm nursery in Fujian Province were selected.The study revealed a
【机 构】
:
KeyLaboratoryofSilvicultureandConservationoftheMinistryofEducation,YuanhuaForestryBiologicalTechnolo
【基金项目】
:
supported by the Fundamental Research Funds for the Central Universities of China (2015ZCQLX-02 2017-LYSJWJ-1)。
论文部分内容阅读
To explore differences in leaf morphology between Sapindus mukorossi and Sapindus delavayi,and how the environment might drive these differences,80 germplasm samples from the Sapindus germplasm nursery in Fujian Province were selected.The study revealed a
其他文献
收集了国内外再生混凝土梁剪切破坏和弯曲破坏的试验数据,分别建立数据库。通过将试验数据与中国规范GB 50010—2010、欧洲规范MC 2010的抗弯承载力公式计算结果作对比,与中国规范GB 50010—2010、美国规范ACI 318-14和Zsutty的抗剪承载力公式计算结果作对比,分析各公式预测结果的准确性,同时基于各具体变量因素,考虑中国规范GB 50010—2010公式的准确性,并且分析中国规范公式用于再生混凝土梁极限承载力计算时的可靠性。结果表明:对于再生混凝土梁的抗弯承载力计算,中国规范GB
某高层框架-剪力墙结构为竖向不规则结构,结构总高度67m,地上13层。设计时提出了两个方案,并对两个方案的整体抗震性能进行了分析和对比。方案一为减小11~13层剪力墙、框架柱截面,减少剪力墙数量,10层侧向刚度比满足规范要求;方案二为保持11~13层框架柱截面不变,减小剪力墙截面和数量,10层侧向刚度比不满足规范要求。采用SATWE和SAUSAGE软件对这两个方案分别进行了小震弹性分析和大震动力弹塑性分析。结果表明,方案一的楼层受剪承载力和层间位移角在10层存在突变,11~13层为薄弱楼层,鞭梢效应明显;
通过对碳纤维的体积掺量分别为0,0.3%,0.6%,0.9%,1.2%,1.5%的轻骨料混凝土进行3,7,14,28d混凝土立方体抗压强度试验和劈裂抗拉试验,分析了碳纤维的掺入对混凝土力学性能的影响;利用环境扫描电镜试验观测碳纤维与混凝土界面的粘结关系;利用Rapid Air 457分析仪测定混凝土内部的气孔结构,再结合灰色关联度分析,探讨混凝土微观气孔结构与宏观力学性能的关系。试验表明:当碳纤维的体积掺量为0.3%时,混凝土的力学性能达到最优,抗压强度提高了10.28%;碳纤维的掺入可以细化混凝土内部的
为了分析钢筋混凝土(RC)梁抗剪承载力模型的计算精度和适用性,系统分析了国内外设计规范中6个比较典型的RC梁抗剪承载力模型的计算模式不定性。首先基于100组RC梁的抗剪承载力试验数据,对比分析了不同抗剪承载力模型的计算精度,确定了计算模式不定性的概率分布类型、均值和标准差等统计信息;然后分别确定了各抗剪承载力模型具有不同保证率时的计算模式不定性特征值,从而可以对各抗剪承载力模型进行修正。分析结果表明:中国、欧洲、美国和加拿大规范抗剪承载力模型的计算模式不定性服从对数正态分布,而澳大利亚和日本规范抗剪承载力
Foliar C/N stoichiometry is an indicator of geochemical cycling in forest ecosystems,but the driving changes for its response to urbanization at the wide scale is not clear.In this study,data on tree-leaf C and N stoichiometry were collected in papers fro
The tropical arboreal species Brazilian mahogany(Swietenia macrophylla) is very important economically and ecologically,for which understanding ecophysiological variables such as sap flow will improve understanding of the species and its cultivation.This
为了研究高延性混凝土(HDC)在卤水侵蚀作用下的基本力学性能变化规律,以3种氯盐溶液(5%,10%和15%NaCl溶液)和3种卤水溶液(5%NaCl+5%Na2SO4,5%NaCl+10%Na2SO4和10%NaCl+5%Na2SO4溶液)为侵蚀介质,对HDC试件进行卤水长期浸泡(共360d)试验,分析了不同浓度的卤水溶液长期浸泡下HDC试件抗压和抗折强度随浸泡时间的变化规律
Sustainable forest management heavily relies on the accurate estimation of tree parameters.Among others,the diameter at breast height(DBH) is important for extracting the volume and mass of an individual tree.For systematically estimating the volume of en
The development of the mining industry has led to the appearance in many parts of the world of vast technogenic territories from which toxic heavy metals enter the environment and food chains.Physical,chemical,and biological methods of cleaning industrial
The parasitic plant dwarf mistletoe(Arceuthobium) is currently one of the most threatening infestations of coniferous forests worldwide,especially in Eurasia and North America,but its population dynamics in relation to one of its hosts(spruce) remain uncl