八种热带,亚热带豆科植物根瘤菌内源质粒的分布情况

从８种热带、亚热带豆科植物中分离出９种快生型根瘤菌，用双梳子胶内裂解法检测其中的质粒分布情况。质粒数从１到６个不等，大小从３２ｋｂ到８７０ｋｂ，其中至少有一个分子量小于１００ｋｂ的质粒。从不同种属的豆科植物中分离出的根瘤菌，其质粒的数量及分子量各不相同。     

福建平和果树冻害调查

本文分析了１９９９年１２月福建平和出现严重冻害的气象 特点，调查全县亚热带、热果树的冻害情况及影响冻害程度的因素，并提出冻后的管理措施。     

武夷山不同海拔阔叶树叶片养分含量及再吸收效率

为揭示亚热带山地阔叶树叶片养分利用策略随海拔梯度的变化规律，本研究选取武夷山不同海拔(1400、1600和1800 m)44种阔叶树，研究成熟与衰老叶片养分含量、化学计量比及养分再吸收效率，并分析其异速生长关系。结果表明：成熟叶片氮(N)、磷(P)含量显著高于衰老叶，且均随海拔升高而升高。磷再吸收效率(PRE)与氮再吸收效率(NRE)的平均值分别为48.3%和34.9%,PRE显著高于NRE,养分再吸收效率随海拔变化无显著差异。NRE与成熟叶N含量在低海拔处(1400 m)呈正等速生长，与衰老叶N含量在高海拔处(1800 m)呈负异速生长。PRE与衰老叶片N、P含量在低海拔(1400 m处)呈负等速生长，在高海拔处(1600、1800 m)呈负异速生长。各海拔PRE-NRE异速生长指数为0.95。随着海拔的升高，成熟和衰老叶片养分含量升高，但海拔不影响养分再吸收效率，且植物偏好从衰老叶中再吸收P,高海拔养分再吸收效率会影响衰老叶片的养分状况。     

Biomass allocation patterns of Loropetalum chinense

Aims Biomass is the most fundamental quantitative character of an ecosystem. Biomass allocation patterns reflect the strategies of plants to adapt various habitat conditions and play a vital role in evolution, biodiversity conservation and global carbon cycle. Loropetalum chinense shrub is one of the most dominant shrub types in subtropical China. The objectives of this study were to quantify the allometric relationships and the biomass allocation pattern among organs, and to investigate the effects of body size, shrub regeneration origin and site factors on allometry and biomass allocation.
Methods Individual samples of L. chinense were harvested from shrublands in subtropical China and were further divided into leaves, stems and roots. The allometric relationships between different organs were modeled with standard major axis (SMA) regression and the biomass allocation to different organs was quantified. The effects of body size, shrub regeneration origin and other habitat factors on allometry and allocation were examined using Pearson’s correlation analysis and multiple linear regressions.
Important findings The isometric scaling relationships between shoot and root changed to allometric relationships with increasing basal diameter. The scaling relationships between leaf and stem and between leaf and root were isometric for smaller diameter classes, while for larger diameter classes they were allometric. These relationships were significantly different among shrub regeneration origin types. The scaling relationships between different organs were not affected by habitat factors; while the coverage of shrub layer and slope affected biomass allocation due to their influences on the allometric relationships between different organs at the initial stage of growth. The mean dry mass ratios of leaf, stem, root and the mean root to shoot ratio were 0.11, 0.55, 0.34 and 0.65, respectively. With the increase of basal diameter class, stem mass ratio (0.50-0.64) increased, while leaf mass ratio (0.12-0.08) and root mass ratio (0.38-0.28) decreased, and consequently root to shoot ratio (0.91-0.43) also decreased. In secondary shrublands, the leaf mass ratio was 0.12 and the root mass ratio was 0.33, while these values were 0.07 and 0.36 respectively in natural shrublands. The ratio of aboveground allocation was significantly correlated to shrub layer coverage (r = 0.44, p < 0.05). Leaf mass ratio was significantly correlated to slope (r = -0.36, p < 0.05) and root mass ratio was significantly correlated to mean annual temperature (r = 0.34, p < 0.05). Results showed that with the increase of body size, the scaling relationships between different organs of L. chinense changed from isometric to allometric, and more biomass was allocated to aboveground part, and concretely, to stems. Human disturbance affected biomass allocation by its influences on the allometric relationships between different organs, and by increasing biomass allocation to leaves and decreasing allocation to roots. Reduced light resource promoted the biomass allocation to aboveground part, and higher slope resulted in decreased biomass allocation to leaves, while higher mean annual temperature promoted biomass allocation to roots. The variation in annual precipitation had no significant influences on biomass allocation. The biomass allocation strategies of L. chinense partially support the optimal partitioning theory.     

热带宝树——酸角

酸角(Tamarindus indica),又称酸豆、罗望子、罗晃子、酸梅(海南)、“木罕”(傣语),为苏木科酸角属果树。该属仅含酸角1种,有两个类型:甜型和酸型。     

亚热带森林中环境和物种多样性对灌木存活的影响

灌木是森林生态系统的重要组成部分,在维持物种多样性、促进养分循环、保护幼苗更新以及促进营养级相互作用等方面具有重要作用,其存活情况对森林群落组成和生态系统功能具有重要意义。但亚热带森林中灌木的存活情况及其影响因素仍有待探究。本研究依托于中国亚热带森林生物多样性与生态系统功能实验研究平台(BEF-China),利用105个不同乔木与灌木多样性相嵌套样方中2012年和2019年的灌木个体存活数据,以及样方水平的土壤养分数据、地形数据、物种多样性数据和物种水平的功能性状数据,通过构建一系列广义线型混合模型(GLMM)探讨了非生物因素、生物因素以及灌木功能性状对灌木存活的影响。结果表明:不同灌木物种的存活率具有显著差异。坡度较小的山谷、山鞍部位以及土壤碳氮比较高的环境更有利于灌木存活;乔木和灌木多样性对灌木存活影响有限,但乔木多样性的增加可通过形成更郁闭的林冠提高灌木存活;灌木功能性状显著影响灌木存活,且倾向于保守型生活策略(即较小的比叶面积、叶片氮含量、气孔大小,较高的叶干物质含量、木质密度)的灌木物种具有更易于存活。通过模型比较发现,包含所有因素的全模型对灌木存活的解释度最高,不同影响因素...     

提高果树光合作用的探讨

果树叶片的光合产物是形成果实的物质基础,但果树利用光能只有0.5-2%,因此提高其光合效率是获得优质高产的重要措施之一.提高光合作用应从增加光合面积、延长光合时间和增强光合力三个方面加以考虑,结合果树特点,需做好以下几项工作:     

中国果树害虫一新记录种——一点木蛾的记述（鳞翅目：木蛾科）

本文首次记述我国为害荔技、龙眼叶片的一点木蛾Epimactis monodoxa Meyrick,是作者1983-1984年的研究成果。     

征稿简则

《亚热带植物科学》(CN 35-1243/S,ISSN 1009-7791)创刊于1972年,是福建省亚热带植物研究所主办的植物学(含园艺学、农学、林学、生物学等)综合性学术期刊。双月刊,于双月月末出版。主要刊载植物生理生化、分子生物学、基因工程、遗传育种、群落生态、系统分类、资源保护及开发利用等方面具有创新性的原始研究论文与较高水平的专题综述。