竹笋象危害对竹材物理力学性质的影响

对受笋万纹象(Otidognathus rubriceps Chevrolot)、一字竹笋象(O.davidis Fairmaire)、大竹笋象(Cyrtatrachelus longimanus Fabricius)危害后断梢毛竹、竹腔注药防治后毛竹、正常毛竹3种竹材进行竹材抗弯强度、抗弯弹性模量和顺纹抗拉强度测定结果表明,与正常毛竹相比较,受竹笋象危害断梢毛竹差异显著,3个竹材物理力学性质指标分别下降了43.79%、39.01%、29.28%,竹腔注药防治后毛竹3个指标下降了13.87%、10.95%、9.01%,但差异不显著,不影响竹材的使用价值.     

浑善达克沙地复合式固沙造林技术分析

复合式造林技术 ,实施后形成带、网、片 ,乔、灌 ,针、阔混交复合式格局 ,变一般固沙型式所形成的单一脆弱植物结构 ,为多样性生物群落 ,使防沙治沙效益向更高层次发展。     

扬州市邗江低湿江滩地林农复合构建模式早期经济效益研究

对江苏省扬州市邗江渔业乡低湿江滩地构建的4类16种林农复合模式的经济效益评估结果表明,意大利杨与菊苣、意大利杨与荩草、意大利杨与苏丹草、意大利杨与银杏苗、意大利杨与棕榈、意大利杨与莲、水杉与药用蚂蝗、水杉与精鱼等8种复合模式是低湿江滩地开发经济效益高的优良构建模式;围网养殖尤其是船带网箱移动养殖长江水特产品是江滩水面资源开发利用的高效特色模式。认为滩地开发应在巩固“八五”绿化滩地,营建抑螺防病林成果的基础上,引进新树种,新种植、养殖优良生物品种,用新技术进行优化配置,以优化现有湿地森林结构,创立体现沿江湿地林渔特色的“多物种、多功能、多效益”人工林系统,建设观光林网,观光渔业,滨江湿地森林生态旅游村,进一步促进江滩湿地资源深度开发及沿江农村经济与社会可持续发展。     

苦参碱水剂防治油茶毛虫药效试验

应用0.36％苦参碱水剂进行防治油茶毛虫幼虫试验研究,结果表明:采用300～1000倍液防治≤4龄油茶毛虫幼虫,72h后,其杀虫率达91.2％以上;防治≥5龄油茶毛虫幼虫,72h后,其杀虫率为89.7％～96.1％。在该试验设计的浓度范围内,苦参碱水剂的杀虫效果(包括残留药效)随浓度的增大而提高,随气温的升高而降低。     

灰花纹鹅膏菌及其生态习性

灰花纹鹅膏菌Amanita fuliginea Hongo的分类地位和生态习性国内一直没有详细报道.用形态解剖、HPLC和种群生态学研究方法对其研究表明日本学者Hongo对该菌的分类是正确的；它的毒素含量与欧洲的主要种毒鹅膏菌Amanita phalloides(Fr.∶Fr.)Link毒素含量相当，甚至更高.湘东湘南丘陵针栎混交林非常适宜该菌生长发育与演化.     

小陇山林区灌丛特点及保护利用初探

以甘肃省小陇山林区为对象，分析论述了该林区灌丛的特点、类型及分布。同时提出了3种保护培育措施和5种利用途径。     

微型月季研究进展综述

在系统论述微型月季（Rosa chinensis minima）发展简史的情况基础上，综述了微型月季的生物学特性，栽培及应用概况，繁殖、栽培及产后研究进展，提出了对微型月季育种方向的发展展望。     

棉籽油及油脚合成汽车涂料固化剂原理的研究

以棉籽油及油脚为原料，经由甲酯化、异构化、聚合及酰胺化等反应，合成了汽车涂料固化剂，探讨了聚合反应的机理，并进行了应用性研究。试验表明，由棉籽油合成的聚酰胺，可以作为汽车电泳涂料固化剂，具有较为广阔的应用前景。     

林木种子的发芽技术

依据林木种子的生理、形态特征、解剖结构 ,在通常采用的 6种发芽方法中 ,选择适合于种子特征 (形态、生理 )的发芽方法 ,经 10 0个树种、 30 0 0多个种批的发芽验证 ,总结了 4类种子的发芽要点、技术条件 ,给出了 10 0个树种发芽率的最高值 ,为绿化造林、苗木培育的种子发芽提供参考依据     

Post-fire habitat restoration of sables during winter season in northern slope of the Great Xing＇an Mountains

Habitat loss and fragmentation have been associated with the decline of endangered species. In 1987, a catastrophic fire in the northern Great Hing＇an Mountains of China, where the main habitat of sables （Martes zibellina） is located, aggravated the loss and fragmentation of the forest landscape. Due to restricted distribution and low population density, sables were listed in the national first-grade protected species in China. The objective of this paper was to identify to what extent the habitat of sables had been restored 13 years after the fire. Based on the behavioral data, which came from field survey information by radio-tracking, GPS （Global Positioning System） and forest inventory data, suitability habitat maps were derived using the Ecological Niche Suitability Model （ENSM）. In addition, the habitat structure was analyzed with selected landscape indices. Although forest cover mostly had been restored by 2000, the results indicated that, compared to the pre-fire situation, the areas of suitable habitat had been reduced significantly, especially those of less suitable, marginally suitable and moderately suitable designation. Fragmentation was aggravated, and suitable patches were found to be further isolated with the exception of those in most suitable areas. The ratio of the patch perimeter to area in unsuitable, moderately suitable and suitable areas decreased, while the ratios within other suitability types increased. Moreover, the percentage of soft boundaries decreased slightly, which can influence the redistribution of sables. The results above indicated that the suitable habitat had deteriorated, and the restoration of the sables＇ habitat remained to be done.