2BTRH-5型红松播种机实验分析

2BTRH-5型红松播种机采用交错式凸齿柔性护种排种装置,可实现床作精少量播种作业,彻底解决了长期以来一直无法解决的排种器伤种、伤芽等问题,机具的作业质量和作业效率也有显著提高。整机结构简单,操作方便,制造成本低。性能和生产试验结果表明:机具的作业质量比手工作业显著提高,生产率提高了4倍以上,作业成本比手工作业减少了2倍以上,节约良种30%以上,具有显著的经济效益和生态效益。     

飞达防除苗圃地杂草试验研究

30%飞达草甘膦可溶性粉剂是采用国际领先水平的天然植物源高效助剂SDP与草甘膦原药配制而成,它克服了草甘膦原药在水中溶解度低的问题。采用每666.7m2的商品用量分别为100、146.7、200和246.7g的4个处理,进行了3次试验结果表明:使用100、146.7、200和246.7g·666.7m-2用量时,对应的平均除草率分别为49.0%、61.2%、65.1%和70.2%。在试验所选用的4个剂量中,以用量为246.7g·666.7m-2时效果相对较好,在河西地区全年化学除草2~3次即可。结合试验提出了用药注意事项。     

迪庆州川西云杉造林技术

介绍川西云杉生态、生物学特性.根据保存的人工川西云杉林成活及生长情况,认为迪庆州寒温带地区是川西云杉适生区,川西云杉是高寒山区天然林采伐后理想的迹地更新树种.藉此,对其种子采集、圃地选择、播种育苗、苗期管理、造林地选择、整地、造林方法、抚育管理、病虫害防治等一系列苗木培育及造林技术进行了阐述.     

不同育苗基质对铁力木苗木生长的影响

以森林土为对照,利用农业剩余物树皮、锯末、蔗渣、咖啡壳、珍珠岩等为原料,按照一定比例配出6种基质,研究不同育苗基质对铁力木苗木苗期生长的影响。结果表明:以充分发酵的松树皮(60%)+锯末(35%)+牛粪(5%)组合的基质,培育的铁力木苗高、地径均极显著优于其他基质和对照,可推荐作为铁力木生产育苗基质。     

云南西双版纳棕榈藤的民俗和经营方式

经验表明：在当地的水平上,自然资源的可持续发展没有使当地的群落完全投入以及本地人们的参与.云南的西双版纳,在资源的可持续和保护的基础上,当地人与自然资源和生存环境建立了非常紧密的关系.植物的遗传多样性,如棕榈藤的管理是通过农业和林业的方式在当地的群落中实施,如民间传统的桑帕巴哇（村社藤类保护林）和旱谷地-藤园（轮歇地棕榈藤传统栽培体系）.     

国外林木容器育苗精量播种装备现状分析

简要阐述了林业容器育苗技术及其精量播种装备技术,介绍了国外几种典型林木容器育苗精量播种生产线概况,指出了我国现阶段林业容器育苗播种生产线装备在发展应用过程中存在的制约因素。     

Variability in height growth,survival and nursery carryover effect of Betula papyrifera provenances

Eleven paper birch (Betula papyrifera Marsh.) provenances from a single geographic region in northern Idaho and four geographic regions in British Columbia (BC) were studied to determine whether morphometric variability was due to species' genetics, growing environment, or their interaction. Seedlings were grown at three nurseries in BC and Idaho and planted in a randomised single-tree interlocking block design at Skimikin (50°47′) and Red Rock (53°45′) common gardens in BC. Geographic variation in birch height growth was regulated by genetics and a complex interaction with environmental factors. Growth does not follow latitudinal, longitudinal or elevational clines although provenances at the southern garden showed better height growth compared to the northern garden. Greater percentages of seedling mortality were observed at the northern garden compared to provenances planted at the southern garden. Birch height growth was significantly influenced by nursery displacement effects up to four years after establishment. The safe range of southward seed-transfer distance may be as much as 5°, and beyond this limit a detrimental effect likely occurs. Collectively, these results suggest that a provenance best suited to one environment might not be the best for another environment. However, these findings will be useful in understanding the genecology of paper birch when establishing operational seed-transfer guidelines in BC.     

低碳经济视角下河南林木生物质能源发展策略

低碳经济作为一种新的发展模式用于指导林木生物质能源发展,是改善能源结构,实现社会经济可持续发展的有效途径。文章分析了低碳经济和林木生物质能源的内涵及两者之间的关系;论述了河南省林木生物质能源资源总量、分布;主要林木生物质能源树种开发利用现状及存在的主要问题;从资源调查评价、开展战略研究、制定相关政策、加大研发力度、启动示范工程等方面分析了低碳视角下河南省林木生物质能源资源现状、趋势及发展对策。     

枫杨容器苗育苗技术研究

研究了不同容器规格、不同育苗基质和不同控根方法对枫杨容器苗质量的影响。结果表明:8 cm×8 cm×16 cm规格的育苗袋培育的苗木质量形态指标与生理指标都相对较好,为育苗首选;黄心土 泥炭 珍珠岩(体积比为1∶1∶0.2)培育的苗木表现最好;空气修根效果较好,其根系成团现象比较明显,用质量浓度为150 g/L的碳酸铜对容器苗进行化学控根效果最显著。     

Semi-wild palm groves reveal agricultural change in the forest region of Guinea

In West Africa, natural regeneration of oil palms (Elaeis guineensis Jacq.) can be favoured by agricultural practices. The structure of palm groves may thus reflect the history of land use. In this study, we examined the connection between biophysical factors, land use and the structure and dynamics of semi-wild palm groves in the village of Nienh, in the forest region of Guinea (Forest Guinea), in order to determine to what extent semi-wild palm groves could be considered as an ecological indicator of the history of regional landscapes. Grove management strategies of farmers were also determined and related to farm characteristics. In Nienh, semi-wild palm groves were found in three cropping systems with differing characteristics in each. Palms were scarce in lowland agricultural areas (8 palms ha⁻¹), while they were significantly taller (15.8 m on average) and less dense (36 palms ha⁻¹) in agroforests than in slash-and-burn cropping systems (9.4 m and 55 palms ha⁻¹ respectively). Interviews with farmers showed that it was possible for a farmer to have a global strategy of semi-wild palm grove densification combined with oil palm elimination on a plot scale. The lack of regeneration of palms in agroforests resulted from the almost systematic elimination of young palms by farmers. Conversely, in slash-and-burn cropping systems, young palms were often preserved. As the structure of semi-wild palm groves was partly explained by agricultural practices, it could be used as an ecological indicator of changes in practice in relation to socio-economic context.