临沂市城市木本植物生长适应性调查

在对山东省临沂市城市道路、公共绿地、广场、公园、湿地等绿化木本植物进行调查分析的基础上,从植物生态适应性与生态功能角度,初步研究了城市绿化在基调树种与骨干树种选择、绿化群落构建、生态质量方面的情况以及存在问题和改进技术措施.     

木本植物组织总RNA提取的要点与原理

根据提取木本植物组织RNA时所获得的知识和经验，对木本植物组织总RNA提取时所遇到的提取产量低、RNA降解、多酚物质干扰、DNA干扰、多糖干扰、蛋白质干扰及杂质干扰等问题进行了探讨，并提出了具体的解决方法。同时，对各种常用的RNA提取方法进行了分类，并对它们的原理及优劣进行了论述与评价。     

Interactions between N,P and C mobilisations during spring growth of a semi-evergreen shrub (Ligustrum ovalifolium L.) grown in containers with different fertilisation schedules

Container-grown Ligustrum ovalifolium L. plants were used to determine the influence of nutrient availability on the mobilisation of carbon (C), nitrogen (N) and phosphorus (P) during spring growth. During the spring of the second growing season, plants either received no fertiliser, or were fertilised early (starting 17 days after bud break) or late (starting 3 months after bud break). Nutrient composition of different plant tissues was determined at several times during the second growing season from bud break to the end of elongation. Time of fertilisation did not influence aerial dry weight until flowering was completed. Plants that received no fertiliser or were fertilised late had greater root dry weight than plants that received fertiliser early. Fertilised plants had a second flush of growth after flowering completed. Nitrogen and phosphorus mobilisation occurred from bud break to the end of elongation (3 months). Nutrient mobilisation was effective in each perennial organ: root, trunk, ligneous stems and old leaves. However, the role of old leaves as storage organ was minor compared to evergreen tree leaves. Carbon mobilisation only occurred on the 1st month following bud break, before elongation. C-starch accumulation was observed in unfertilised plants even when the C-starch quantities in early fertilised plants were very low at the end of elongation, mainly in roots. In spite of fertilisation supplies, N and P quantities did not increase after elongation in the early fertilised plants, probably in relation to C insufficiency in roots to sustain N and P absorption and assimilation. By contrast, in late fertilised plants, high C quantities in roots were mobilised for N and P uptake and assimilation, which allowed both second growth flush and storage of N and P in perennial organs. The mobilisation of nutrients before and during elongation revealed the nutritional autonomy of shrubs, which could allow fertiliser use efficiency to be increased and environmental impacts to be minimised by delaying spring fertilisation. Nevertheless, the shrub ability to valorise fertilisation supplies for sustaining growth or nutrient storage restoration required sufficient C-starch quantities in roots. The starch accumulated in roots before late nutrient supply can be used for these objectives.     

西安植物园木本植物近十余年物候变化的特征分析

通过对1988-2002年西安市植物园20种木本植物物侯资料的分析。结果表明：近十余年西安市植物园20种木本植物物侯变化趋势明显表现为所有植物春季物侯逐年提前、大多数植物秋季物侯逐年推迟的趋势；春季物侯对气侯变化的响应程度显著大于秋季物侯。大多植物生殖生长期的物侯变化幅度大于营养生长期。因此，春季物侯和生殖生长期物侯更加适宜作为气侯变化的物侯指标。该研究对于评价物侯及物侯不同指标对气侯变化的响应有一定的参考价值。     

内蒙古木本植物区系的研究

内蒙古共有木本植物４８３种（包括种下分类单位,野生种４１８种,栽培种６５种）隶属于５２科,１３９属,其中乔木１３２种,灌木及半灌木和小半灌木３５１种,这些植物中,裸子植物３科７属３１种,被子植物４９科１３２属４５２种,在被子植物中双子叶植物４８科１３１属４５１种,单子叶植物１科１属１种,本文对４１８种野生木本植物进行了区系统计和分析,结果表明,该区系属于温带性质,地理联系广泛,水平替代现象明显,交     

近39年民勤荒漠区气温变化对乔木植物物候的影响

利用甘肃民勤荒漠草地生态系统国家野外科学观测研究站1975—2013年气象资料,与当地乔木沙枣、二白杨、胡杨、小枣、家杏、桑树6种乔木物候观测资料,通过5年时间段统计物候发生日的偏离程度,统计春季物候年度展叶期、开花期变化趋势,分析物候变化对气温变化的响应关系。结果表明,近39年研究区春季平均气温以0.053℃/a的速度升高,荒漠植物的多种物候期出现同步性的提前;39年春季物候提前了7.6~12.1 d,即气温每提升1.0℃,可导致春季物候期提早2.1~5.8 d,秋季落叶期平均推迟3.8 d。