渭北黄土高原沟壑区困难地造林技术初探

近年,随着造林绿化的深入推进,渭南市造林地逐步转向以沟壑和梁峁顶为主的困难地.本文结合渭北旱塬沟壑区立地条件,分析了制约困难地造林成效的主要问题,在树种选择、规范整地、造林模式、栽植技术、抗旱造林技术、抚育管护等方面进行了深入探讨,对加快渭南市困难地造林绿化进程具有一定的指导意义.     

黄甜竹山地造林技术研究

通过黄甜竹山地造林试验,主要研究不同造林时间对成活率和发笋的影响,总结了黄甜竹山地造林技术.研究结果表明:黄甜竹耐贫瘠,耐干旱,是山地绿化造林、经济开发的优良竹种;在相同条件下,春季造林成活率略低于梅雨季节造林,但是春季造林比梅季造林有利于发笋长竹,提早成林,黄甜竹适宜春季造林.     

如何提高造林成活率

一、影响造林成活的主要原因1.种子发芽能力。2.发芽条件。3.苗木质量。4.种植技术。5.造林季节。6.适地适树。7.及时抚育。二、提高造林成活率应采取的措施(一)造林地的整地造林地整地可以改善立地条件,提高造林成活率,促进林木生长,保持水土,减免土壤侵蚀,有利于造林施工,提高造林质量。(二)树种选择选择造林树种要坚持适地适树的原则,根据不同的立地条件选择适宜的树种。(三)苗木对苗木的要求是粗壮通直,充分木质化,根系发达,无虫害,不失水,高度合乎要求。(四)造林1.造林设计要符合实际;2.苗木保鲜。早晨或阴天起苗,起苗时保持根系完整;3…     

赤峰风沙地造林关键技术研究

针对赤峰自然条件十分恶劣,造林成活率低的实际情况,从如何进行风沙地造林整地、造林树种选择、初植密度及配置、苗木规格、造林季节选择等5个方面进行了详细阐述,为风沙地造林提供重要依据.     

樟树造林几种辅助措施的效果分析

对永春县石鼓镇在2011年樟树造林时采取的不同辅助措施的效果进行分析.结果表明:采取造林辅助措施的樟树当年新梢生长量和苗木成活率高于常规造林.不同造林辅助措施樟树的次年树高和地径生长量大小顺序与当年新梢生长量一致,均为:C＞B＞A,其均与常规造林的树高和地径生长量没有显著差异.在干旱时期,采用保水剂和ABT生根促进技术进行樟树造林可以显著提高当年新梢生长量、苗木成活率,在雨量充沛的第二年对树高生长量、地径生长量的效果不显著.     

宜林荒山荒地造林模式初探

造林灭荒和绿化达标后,如何开展宜林地造林是林业生产面临的重要课题.笔者分析了宜林荒山荒地类型,有针对性地提出宜林荒山荒地造林模式、造林技术、造林管理的具体措施,对生产实际具有较强的指导意义.     

提高毛竹实生苗造林成活率的技术措施

毛竹实生苗造林,具有适应性强,挖苗、起苗、运输和栽植操作方便,成本低等优点.经过多年实践探索,为提高毛竹实生苗造林成活率,积累了一些实用的造林技术措施,现介绍如下. 一、造林地的选择海拔800米以下的山地、丘陵都可以营造毛竹林.但地形、坡度、坡向、土壤质地与毛竹造林成活和生长发育有密切关系.造林地宜选择在背风、排水良好、土壤深厚、肥沃疏松的山谷地或山腰缓坡地带.土壤以富含大量有机养分和无机矿物质元素的乌砂土和砂质壤土最为适宜.     

巨桉栽培管理实用技术

从巨桉的属性、分布、造林时苗木的选择、造林地的选择、整地、造林密度、造林时间、植苗方式、幼林抚育以及肥水管理等方面进行了研究总结,详细地探讨了巨桉栽培管理实用技术.     

中德合作造林项目防护林混交造林技术与效果评价

介绍了中德合作陕西（二期）延安造林项目造林地立地类型划分、树种选择、混交造林技术、造林方法和幼林抚育管理,并对项目实施10年后的造林成效进行了评价.     

浅析提高造林成活率和保存率的几点措施

本文介绍了苗木的产地、品种质量、运输、假植和造林地气候差异等影响造林成活率和保存率的因素,提出适地适树、加强造林后的管护和幼林抚育等措施.     

Strategy for screening eucalypts for saline lands

We present a new approach for selecting seed sources of Eucalyptus to be grown on saline land. We evaluated our method using 22 seed sources, 11 tree-form species and 11 mallee-form species. We found that the commonly used strategy of selecting seed sources on the basis of average productivity was inappropriate, as average productivity was poorly correlated with the relationship between productivity and salinity that was actually observed. Using our new approach, we categorized seed sources as salt-sensitive or salt-tolerant based on the strength of the observed relationship between salinity and productivity. Seed sources defined as sensitive were associated with relatively large (−24.8 to −64.2%) productivity losses, while the changes in productivity for tolerant seed sources ranged from −17.1 to 10.5%. On average, reductions in height due to increased salinity were about 30% greater for sensitive seed sources than tolerant ones, although the effect was smaller for mallee-form and greater for tree-form seed sources. The difference between sensitive and tolerant seed sources was similar after 1, 2 and 4 years of growth.     

行业精英纵论 2004 实业前线预测 2005

关于中国木制品市场的观点。刚刚在大连参加了2004年中国木制品进出口贸易洽谈会,我对中国作为一个多种木制产品的来源地有了更加崭新的认识随着我们对于把中国当作一个潜在的木制产品原材料产地的兴趣的增长,我很高兴的看到会议谈到了关于木制产品认证的话题．为了保护濒临灭绝的森林和保证将来的木材需要,Home Depot首先于1999年发表了它的木材购买政策你可以在HomeDepot的主页：     

盆栽观赏竹培育技术研究

结合实施浙江省“九五”课题“丛生竹笋与观赏竹开发研究”,从浙南丰富的竹类资源和发达的社会经济之实际出发,对我国盆栽观赏竹种的筛选、母株选择、处理、挖掘、生长管理、成景管理以及盆土和竹盆选择等系列环节做了配套研究,为开发浙南丛生观赏竹资源提供技术措施和母竹种质。     

请给百姓一份安全食品菜单

“民以食为天”,“人命关天”,这两句古话阐明了食品安全无以复加的重要性。实际上,食品安全的重要性还远不止于此,这个问题不仅关系到人的健康和生命,而且关系到经济发展、社会稳定,乃至公民对整个社会和政府的信心。     

植物组培内生菌污染的防治措施

文章对植物组织培养中的内生菌污染和外生菌污染的区别和内生菌在植物体内的分布种类进行阐述,对组培内生菌污染的危害特点、发生原因及防治措施等进行归纳综述,以期为植物组培内生细菌污染的预防和控制提供参考。     

请给百姓一份安全食品菜单

“民以食为天”，“人命关天”，这两句古话阐明了食品安全无以复加的重要性。实际上，食品安全的重要性还远不止于此，这个问题不仅关系到人的健康和生命，而且关系到经济发展、社会稳定，乃至公民对整个社会和政府的信心。[编者按]     

An Ecological Framework for Planning for Forest Health

Concerns for maintaining biodiversity have led to the adoption of ecosystem management as the paradigm for federal land management. This approach will identify desired future conditions as the goal for management, based on ecological objectives for a given landscape. Some management efforts attempt to identify desired future conditions based on existing successional stages as defined by a classification of overstory vegetation types. Such an approach ignores most of the underlying ecological parameters of the landscape, and is inadequate for identifying past disturbance regimes and future successional pathways. An assessment of desired future conditions based on an ecological classification system is essential to overcome these inadequacies. The strategy proposed in this paper uses an appropriate ecological land classification, based on either ecological land types or habitat types, included in a broader hierarchical classification system. It also uses a vegetation map of existing overstory vegetation. These two maps are overlaid to generate polygons of ecological units that can then be used to create an ecosystem diversity matrix. Each polygon (stand) can be evaluated as to its composition and structure relative to its possible placement within the ecosystem diversity matrix through comparisons with historical ranges of variability. The overall ecosystem diversity matrix can then be examined in terms of the distribution of successional stages within each habitat type or ecological land type. The goal should be to maintain at least adequate ecological representation of all successional stages within each habitat type that occurred historically, based on past disturbance regimes. Adequate ecological representation is defined as sufficient size and distribution of inherent ecosystems to maintain viable populations of all endemic species dependent on these ecosystems. This approach can maintain and enhance regional biodiversity, but also maintain flexibility in land management options.     

12个桃品种的花芽休眠需冷量和开花需热量

在浙西南地区研究12个桃品种花芽休眠需冷量和开花需热量生态指标.犹他模型测定结果显示:12个桃品种中,花芽休眠需冷量低的品种为春蜜、超红、中油11号、中油7号、中油4号,约为550～650 cu;其次是丽油5号、仓方早生、燕红、丽油3号、早凤凰,约为650～ 800 cu;需冷量高的品种为新川中岛和赤月,约为900～ 950cu.同一地区不同品种需热量差异较大,同一品种年际间差异相对较小.以生长度天模型试验结果表明:开花需热量低的品种为赤月和丽油3号,大约400 ～ 500 d·℃;其次是新川中岛,大约500～600 d·℃;春蜜、丽油5号、早凤凰、中油4号、中油7号、仓方早生和燕红大约600 ～ 700 d·℃;需热量较高的是中油11号和超红,约为700～800 d·℃.12个桃品种花芽休眠需冷量与开花需热量之间呈乘幂函数曲线显著负相关.