Biomass Fly Ash as Foliar Fertilizer for Hybrid Aspen Trees: Nutrient Uptake,Growth Response,and Compatibility with Nitrogen Fertilizer

Biomass ash is an important and potentially useful by-product of the bioenergy industry. As a “proof of concept” for using biomass fly ash as a foliar fertilizer, we tested (i) whether the nutrients in the ash were absorbed by hybrid aspen trees, (ii) whether the ash affected tree growth, and (iii) whether the ash was compatible with nitrogen foliar fertilizer. Four foliar treatments (water [control], ash suspended in water, nitrogen fertilizer solution, and ash suspended in nitrogen fertilizer solution) were evaluated. Several nutrients in the fly ash were absorbed by hybrid aspen both in the greenhouse and in the field; however, this absorption did not significantly affect tree growth in either setting. Nitrogen fertilization was associated with significantly higher tree growth in the greenhouse; inclusion of the fly ash with the nitrogen fertilizer solution did not significantly alter this growth response.     

施肥对杉木幼林生长效益和肥料释放特性的影响初步研究

为探讨施肥对杉木幼林生长以及肥料释放特性的影响,在福建省顺昌县洋口国有林场麻溪工区进行试验.结果表明:施肥处理与对照相比,施肥1年后的树高当年增长量为3％～17％,胸径当年增长量为1％～10％,施肥2年后树高的当年增长量为9％～35％,胸径当年增长量为16％～62％.随着杉木幼林的生长,与施肥前相比,施肥处理土壤中有机质、全钾含量大体上呈逐年降低的趋势,而全氮、全磷、水解氮、速效钾含量先增加后降低.此外,袋控肥料的深层施肥可有利于肥料中氮素和磷素的释放,可提高肥料的长期效益.     

闽南桉树短轮伐期工业原料林基地建设若干问题的研究

在广泛调查、收集闽南地区巨桉、尾叶桉、巨尾桉等按树新品种引种现状的基础上，通过研究现有林分的生长情况、经济效益和速生丰产栽培技术，提出我省闽南地区建设桉村短轮伐期工业原料林基地面临的问题与对策。     

不同栽植密度下欧美杨叶片耐荫性与生物累积量的关系

为阐明不同栽植密度下欧美杨无性系树冠叶片耐荫性与生物累积量的关系,选择高密度(2 m×3 m)和低密度(2 m×5 m)栽植的不同亲本的5个欧美杨无性系为研究对象,测量了生物量、树冠结构、叶面积指数及光合参数。结果表明:(1)不同无性系对栽植密度有不同的反应;(2)具有较高生物量的欧美杨无性系树冠叶片在高、低栽植密度下均表现出较强的耐荫性特征;(3)树冠耐荫性在不同密度中表现出差异性,在低密度栽植中,树冠上层耐荫性与生物量和叶面积指数关系密切;在高密度栽植中,树冠上、下层叶片耐荫性与生物量和叶面积指数关系密切;(4)树冠耐荫性特征受亲本和环境的共同影响,由低密度到高密度,具有较高生物量的03-04-97、03-04-111、03-04-171树冠中下层叶片光补偿点和暗呼吸速率大幅度降低。该研究结果可为选择适合高密度栽植的欧美杨无性系提供数据和理论支持。     

Comparative growth,dry matter accumulation and photosynthetic rate of seven species of Eucalypt in response to phosphorus supply

Plantations of eucalypts as short-rotation tree crops are rapidly expanding in tropical and sub-tropical regions, including southern China, where the soils are acidic and available phosphorus(P) is limited. We investigated seedling growth, dry matter accumulation, and the dynamics of photosynthetic rate and chlorophyll content of seven Eucalyptus species/hybrids(E. dunnii, E. grandis, E. grandis × E. camaldulensis, E. urophylla × E. camaldulensis, E. urophylla × E. tereticornis, E. grandis × E. tereticornis, E. urophylla × E. grandis) in response to different levels of P supply(0, 6, 12 and 18 mg?kg-1 KH2PO4). The photosynthetic rate and the chlorophyll content significantly declined as the P supply declined in almost a linear fashion for all species as the P stress period extended. In the absence of P supply, height growth of seedlings of all species was significantly impaired, while root collar diameter growth and whole plant dry matter accumulation was not affected by the level of P supply in most of the species. Significant inter-species variations in growth, dry matter accumulation and photosynthetic rate in response to P supply were detected. Eucalyptus dunnii had the lowest growth performance across all levels of P supply while E. urophylla × E. tereticornis showed superior growth performance. From a practical point of view, E. urophylla × E. tereticornis is suggested as a candidate hybrid for planting on slightly P-deficient sites in southern China while E. dunnii, being a slow-growing species, is not suitable for short-rotation plantation. On plantation sites where severe P deficiency exists, P fertilization needs to be considered to boost rapid growth of seedlings so as to meet the management objectives of short-rotation plantation.     

探索林业发展新思路 营造短轮伐期工业林

近年来樟木头林场以发展短轮伐期工业用材林为主,获得了林业经济上的大发展,本文对其所取得成就进行了总结.     

永安桉树发展中的品种选用策略

福建省永安市冬季较为寒冷,本不是发展桉树的理想地区。永安市在桉树短周期用材林基地工程建设中,根据自己的发展目标和地理、气候特点,应用研究的成果,在低海拔地区应用尾巨桉、巨尾桉等速生但耐寒能力偏低的品种,在高海拔地区采用邓恩桉、柳桉等耐寒但较速生性稍差的品种,以充分利用桉树的速生性能;并制定预防寒害的培育措施,研究新品种,以降低寒害的威胁。     

广西短轮伐期工业原料林建设现状及对策

近年来,广西短轮伐期工业原料林建设发展迅速,但仍存在一些因素严重影响短轮伐期工业原料林持续健康的发展。从广西短轮伐期工业原料林建设的现状出发,探讨促进广西短轮伐期工业原料林可持续经营的措施。     

宁夏腾格里沙漠边缘杨树短轮伐期工业用材林造林技术

根据宁夏腾格里沙漠边缘发展工业用材林的需要,按照长期以来发展杨树造林的经验及技术,将以往综合配套技术进行集成,形成技术上的优势组合.从造林规划设计、树木生长量指标、造林地选择、树种确定、整地、苗木规格、时间、密度、方式方法、抚育管护、病虫害防治、林木保护、检查验收、建立技术档案等方面系统阐述了在宁夏腾格里沙漠边缘营建杨树短轮伐期工业用材林的造林技术.