四翅滨藜的引种试验及栽培技术研究

在气候干燥、寒冷的西北地区 ,引进具有耐干旱、贫瘠 ,抗寒冷 ,抗盐碱等多种优良特性的常绿或准常绿饲料灌木四翅滨藜 ,经过 2a生长全过程的栽培试验 ,观测结果表明 :在不同土壤类型下 ,新梢生长量、扦插育苗的成活率、保存率都表现出差异性。但移栽苗的成活率、保存率差异不大 ,表现出较强的适应性。而在中、强盐碱性土壤、(粗 )砂土中仍能正常生长 ,但新梢生长量低 ,分枝减少     

木麻黄苗期施肥和密度的田间试验

在田间按正交设计方案，进行木麻黄苗期氮、磷、钾施肥试验，并安排了木麻黄苗木五种不同密度试验，结果表明：合理配施氮、磷、钾肥能提高苗木生长量，最佳施肥组合为氮３００ｋｇ／ｈｍ２、磷９００ｋｇ／ｈｍ２、钾１５０ｋｇ／ｈｍ２；适当增大苗木株行距有利于苗高、地径的生长；在一定密度限度（１５００００株／ｈｍ２）下，苗木生物量随密度提高而增加。     

管氏肿腿蜂防治双条杉天牛试验

在贵州省普定县的人工柏木林内,利用管氏肿腿蜂进行了防治危害柏木的双条杉天牛幼虫的试验。每0.67 hm2柏木林分别施放1 500头和2 000头管氏肿腿蜂,1个月后寄生率分别为62.1%和67.7%;并表明其为一项环保有效的防治措施。     

浅谈工厂企业绿地景观设计——以珠海科斯特电源有限公司为例

城市化的过程离不开工业经济的发展,在新兴的城市以及在城市新兴的工业园区内,工业用地都占有极大的比重。因此,工厂企业的绿地景观与公共空间、商业空间以及其它城市空间的绿地景观一样是城市绿地景观的重要组成部分,必须引起我们的重视。作者从绿地景观设计的角度出发,结合珠海科斯特电源有限公司绿地景观设计的实例,探讨了工厂企业在绿地景观设计方面的若干问题。     

Predicting field performance using seedling quality assessment

Seedling quality is defined as fitness for purpose. Attributes for assessing seedling quality are grouped in material attributes that can be rapidly assessed by any number of direct or indirect methods, and performance attributes that are assessed by subjecting whole seedlings to certain environmental regimes and evaluating their growth response. Material attributes comprising morphology, bud dormancy, water relations and nutrition and performance attributes comprising frost hardiness, vigour and root growth potential are discussed with regard to relevance for predicting field performance. Measurement techniques and relevance in assessing seedling quality are presented for different physiological attributes: electrolyte leakage, enzymatic activity, water potential, water conductance, mineral nutrition, food reserves, mitotic index, gas exchange, chlorophyll content, plant growth regulators, stress-induced volatile emission, and nuclear magnetic resonance. Methods with future potential in improving the prediction of field performance are identified and discussed. The methods presented in this respect are chlorophyll fluorescence, infrared thermography, machine vision systems, integrated approaches and ecophysiological evaluations.     

三江平原蒙古栎次生林效应带生态功能模拟

以三江平原试验区为背景,采用植物生态场技术开展次生林效应带生态功能模拟,研究结果表明:蒙古栎林6m效应带产生斑块效应,8m效应带出现边缘效应;4m,6m和8m带的光能利用与风流动模式与效应带的分布方位关系密切,根据光能利用效率总结出蒙古栎林效应带依照8 m带→6m带→4m带逐步演化。     

能源植物麻疯树闽东南引种试验

在福建省南安市进行麻疯树引种育苗,并开展不同海拔和不同立地条件的造林试验。结果表明:种子发芽率平均为81%,造林成活率达92.8%,试验林在冬霜期间没有受冻害,生长良好。当年生试验林9~10月份有少量植株开花结果,单株结果数最多达40粒,至12月份已陆续成熟,初试见效,可为中试和推广提供科学依据和示范。     

迎面火与主地表火相互作用的实验研究

为了研究地表火卷吸作用的范围和迎面火与主火相互作用的机理 ,在大空间室内实验室进行了实验研究 .在该实验室实验可以避免环境风和环境温度变化的影响 .研究结果表明 :(1)在火头前方有明显的逆风区存在 .在逆风区下部的逆风风速要比上部的大 ,而且当高度达到某一数值时 ,逆风就不明显了 ;(2 )迎面火与主火之间即使相距较远也存在相互作用 .当它们相互接近到一定程度时 ,彼此相互吸引 .这使得火的蔓延速度显著升高 .对于火线火强度为 16 0kW·m-1地表火来说 ,蔓延速度增加2 7% .     

切根、截顶对湿地松裸根苗生长调控效果的研究

在江西景德镇和安徽泾县布置了１年生湿地松裸根苗生长后期切和截顶试验，研究其对苗木形态和造林表现的效应及其例题应用制度。两年的结果表明，切根苗的高、径及主根形态指标均低于未切根苗，而侧须根系增加，早切根多次切根处理效应最显著。     

Farms in the black forest of Baden-Württemberg: A historical review

Today the Black Forest is an internationally renowned tourist region in Germany. For centuries the Black Forest remained as a low mountain range regarded as not suitable for settlement due to its unfavourable climatic conditions and difficult terrain. Clearing the dense forests and settlement therefore started at a historically late stage compared to other regions of Germany, about 1000 years ago. Due to the special conditions in this area, the structure of the settlement had to be quite different to those landscapes with more favourable conditions for agriculture. A single-farm settlement developed, farms situated 200 to 400 m away from each other, surrounded by meadows, agricultural land and forests and owned by the farmer’s family. This structure has remained in some areas until today; in other areas different types of settlement took place, and great changes occurred during history. A special type of agroforestry — a slash-and-burn-management of forests — also took place 150 to 200 years ago.