Host plant utilization and population abundance of three tropical species of Cassidinae (Coleoptera: Chrysomelidae)

Considering the little information on the biology and phenology of Chrysomelidae beetles and interaction with their host plants, we have followed the populations of Stolas chalybea, S. areolata and Anacassis phaeopoda for 2 years in order to obtain basic biological data on them and to describe their occurrence throughout the year. After emerging from the eggs, larvae of the three studied species remained aggregated, although the size of the groups decreased as the larvae developed. Egg clusters and young larvae of the two Stolas species were more frequently found on the underside of leaves of their host plants and mature larvae of S. areolata were only observed on the upper side of leaves. Adults of the three species were always isolated and both Stolas species were more frequently found on the upper side of leaves. The number of new branches on the host plant and some other plant physical characteristics were significantly related to Cassidinae abundance. The three studied species became active with the end of the dry season, reproduced more intensely during the rainy season and reduced their activity with the lowering of temperature and rainfall. The beetles also showed a lower peak of egg laying at the end of diapause of adults. This pattern of occurrence was very similar to the occurrence of leaves, especially the newest ones, on their host plants. Significant positive correlations between Cassidinae numbers and temperature showed that this parameter could influence ovipositing and mating activities.     

Polar transport of the plant hormone auxin – the role of PIN-FORMED (PIN) proteins

The PIN-FORMED (PIN) protein family is a group of plant transmembrane proteins with a predicted function as secondary transporters. PINs have been shown to play a rate-limiting role in the catalysis of efflux of the plant growth regulator auxin from cells, and their asymmetrical cellular localization determines the direction of cell-to-cell auxin flow. There is a functional redundancy of PINs and their biochemical activity is regulated at many levels. PINs constitute a flexible network underlying the directional auxin flux (polar auxin transport) which provides cells in any part of the plant body with particular positional and temporal information. Thus, the PIN network, together with downstream auxin signalling system(s), coordinates plant development. This review summarizes recent progress in the elucidation of the role of PIN proteins in polar auxin transport at the cellular level, with emphasis on their structure and evolution and regulation of their function. Received 28 December 2006; received after revision 16 February 2007; accepted 26 March 2007     

上海绿地植物群落特征及优化对策

通过对上海市区101个绿地群落的取样调查,分析了该类植物群落特征.结果表明:上海的绿地群落类型多样性以落叶阔叶林最多,常绿阔叶林次之;群落结构物种单一、结构简单,新建成的植物群落种植密度过高,景观较单调;群落物种组成中外来植物占有相当比例,但区系反映了地带性特征.在此基础上,提出了通过工程技术手段适当改造立地条件,增加上海适生树种数量;同时对绿地植物进行群落结构功能类型和景观功能类型划分,据此进行绿地群落的构建,进而达到生态和景观效果的和谐统一.     

大学校园植物的季相特征与植物景观——以首都师范大学校本部教学区为例

大学校园植物景观是校园文化建设的重要组成部分.校园植物季相变化所形成的动态风貌之美,与植物构成及其配置有着密切的关系.本文通过对首都师范大学校本部教学区木本植物的调查,利用多年植物物候观测资料,划分了校园的物候季节;结合校园植物的季相变化和景观特征,命名了10个有代表性的植物景观,并对校园植物景观建设和环境美化提出了建议.     

大余县钨矿尾砂库区天然生长植物研究

研究了大余县4大国有钨矿尾砂库上天然生长的植物,旨在为今后矿区植被重建与植物修复重金属污染提供材料.通过野外调查分析,对4大钨矿尾砂库区所有植物组成、生长与生境状况进行了研究.结果表明:这4大尾砂库区共出现了61种植物,隶属35科,59属,其中49种为草本植物,12种为木本植物.禾本科和菊科占所有植物种数的29.5%.这些植物中,只有木贼、莎草和狗牙根3种植物在4个尾砂库中都有出现.植物明显生长不良,且主要分布在库区湿润或有水出现的沙土地区.另外,在钨矿尾砂库区,发现了商陆、龙葵和蜈蚣草等重金属的超积累植物.     

三峡梯级水电站日优化运行研究

针对三峡梯级水电站日优化分配问题，在满足给定梯级负荷和提供足够备用容量的情况下，使得梯级耗能最小。本文应用拉格朗日松弛法求解梯级日优化问题，应用拉格朗日乘子松弛系统耦合约束，考虑电站变水头和站问水流时滞的影响，进行梯级电站的负荷优化分配，并将分配计划应用干实时运行当中。实例研究表明，该方法有救、实用，能够实现在线优化和实时运行。     

挖方岩石边坡绿化技术与方法探讨

对挖方岩石边坡进行了分类，分析了挖方岩石边坡绿化方法，探讨了植被混凝土护坡绿化技术及配比要求，并以植被混凝土绿化法为重点，介绍了高坝洲电厂岩石高边坡绿化工程实践．     

植物乙醇提取物对荔枝蒂蛀虫成虫产卵的影响

本文应用干扰作用控制指数 (IIPC)评价了 2 4种植物异源植物次生物质对荔枝蒂蛀虫成虫产卵的影响 ,结果表明 :在供试的 2 4种植物乙醇提取物中 ,对荔枝蒂蛀虫成虫产卵干扰作用效果较好的有非洲山毛豆Tephrosia vogelli、飞机草 Eupatorium odoratum、大叶桉 Eucalyptus robusta的乙醇提取物 ,其 IIPC值分别为0 .10 94、0 .112 2、0 .12 74 ,即它们对荔枝蒂蛀虫成虫产卵的驱避作用效果在 80 %- 90 %之间。     

七星公园植物多样性调查研究

为了解植物区域化分布特点及多样性,分别应用物种丰富度指数（S）、多样性指数（Shannon-Wiener指数）、优势度指数（Simpson指数）和均匀度指数（E）对七星公园植物群落进行了研究.结果表明：样方内植物乔木有9种,灌木7种,草本4种.表现出的丰富度指数为灌木层〉乔木层〉草本层;Shannon-Wiener指数为乔木层〉灌木层〉草本层;Simpson指数为乔木层〉草本层〉灌木层;Pielou均匀度指数为草本层〉乔木层〉灌木层.     

大学校园植物多样性特征及其优化配置——以江苏大学为例

为分析高校绿化状况，合理建设生态校园，以江苏大学为例，通过对实地物种分布调研和分析，发现校园植物物种丰富度不足，但注重环境效益物种的选择。根据配置原则，找出了以工厂、学校绿化带附近为主的绿化漏点，提出解决优化方案。此次调查以期找出共性，为高校生态校园建设提供合理的植物配置方案。