Subjects: Digital Publishing >> New Media submitted time 2023-10-08 Cooperative journals: 《中国传媒科技》
Abstract：当今社会互联网科技的高速发展,促进了各行各业的转型与变革,以互联网为基础的现代化数字模式改革正高速进行着。然而,随着科技的不断进步,数字化的图书出版给传统的图书出版带来了极大的挑战,传统的图书出版作为国家发展的基础产业,需要在严峻的现代发展形势下积极创新,寻找发展出路,以达到在现代化数字出版时代有自己系统的发展模式。本文对数字出版进行了系统阐述,以及给传统图书的出版带来的严峻考验,并给出了现代社会传统图书出版的应对措施。
Subjects: Biology >> Botany >> Applied botany submitted time 2021-04-29 Cooperative journals: 《广西植物》
Abstract： Solanum diphyllum is a kind of small shrub from Solanaceae, little is known about its Cd tolerance ability in the existed researches so far. In order to investigate the physiological responses, growth responses and Cd tolerance characteristics of S. diphyllum seedlings, we conducted a hydroponic experiment with 160 μM Cd stress to determine the indexes of growth (taproot, height, stem diameter, leaf number, biomass, and root to shoot ratio), tolerance ability, Cd content, Cd accumulation characteristics, SOD activity, osmotic adjustment substances (MDA, free proline and soluble sugar), and photosynthetic pigment (Chlorophyll a, Chlorophyll b and carotenoid) in different stress time (0, 0.5, 1, 3, 7, 19 d). The results showed that: compared with controls, Cd had no significant effect on the growth of S. diphyllum seedlings when stress time is 0-3 d, but obvious Cd toxicity was aggravated with the prolonging of Cd stress time (3-19 d). During the period of experiment, Cd stress reduced the total biomass of S. diphyllum seedlings by 13.28%-62.40%, root suffered the most serious biomass damage among different plant tissues. The maximum Cd accumulation of the whole plant was 60.14 μg·plant-1, for root and shoot the maximum Cd accumulation were 43.49 μg·plant-1 and 16.65 μg·plant-1 respectively, Cd accumulation of shoots accounted for 15.46%-35.24% of the whole plant. MDA content of S. diphyllum seedlings increased with increasing stress time, the maximum increase of MDA content in roots was 5.25 times than that of control. SOD activity, the content of free proline and soluble sugars, as well as photosynthetic pigments content showed a trend of increased in the beginning and then decreased. Tolerance index (TI) showed a different tendency, it decreased with increasing time, the minimum value of S. diphyllum seedlings during the whole period of experiment was 0.64. The above results showed that S. diphyllum seedlings have a certain degree of tolerance to high concentration of Cd stress (160 μM), which suggests it is a potential Cd tolerance plant. The osmotic adjustment and root retention might be the main methods of S. diphyllum seedlings to alleviated toxicity to plant growth caused by Cd. This research provides a theoretical basis for finding suitable phytoremediation materials.
Subjects: Biology >> Ecology submitted time 2018-05-29 Cooperative journals: 《生态学报》
Abstract：植物群落高度是反映植物群落特征的重要指标，植物群落高度的测定能给植物群落多样性分析、生物量估算、功能形状研究提供重要的数据基础。传统的森林调查主要由生态调查工作者通过目测或者利用激光测高仪对每个个体进行逐一测定，因此劳动强度大，耗时费力，并且难以进行大面积的植物群落高度调查。近年来，随着无人机（Unmanned Aerial Vehicle，UAV）技术的飞速发展，催生了无人机低空摄影测量和遥感技术，该技术已被应用于农作物植株高度测定和生物量估测等。然而针对植被类型多样、树木种类繁多且地形复杂的山区如何精确的获取植物群落高度仍然是一个较大挑战。以缓坡地形的云南大学呈贡校区为研究区，选取校区内人工种植的雪松（Cedrus deodara（Roxb.） G.Don）林为研究对象，利用无人机搭载可见光相机平台获取研究区近地面航空影像，利用高分辨的影像匹配加密获得的点云数据生成数字表面模型（Digital Surface Model，DSM）。依据点云分类提取非植物类点，消除少数因植被与非植被相接的边缘模糊而错分类的部分，内插后生成数字地面模型（Digital Terrain Model，DTM）。将DSM和DTM叠加相减得到树木高度变化模型（Canopy Height Model，CHM），即获得研究区各个雪松的高度。然后利用激光测距仪测定研究样地内100棵雪松的高度，将此测定的树高与无人机航测技术生成的CHM模型测定的树高值进行精度检验。结果表明无人机测定的树高值与激光测距仪测定的树高值线性拟合度较高，r2值在0.904以上。此方法基于无人机影像生成空间模型，提取树高，受外界环境因素影响较小，且成本较传统测树方法低廉，可广泛运用于各种植物群落的调查研究当中，有极好的应用前景。
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