落叶松腮扁叶蜂蛹发育起点温度和有效积温的研究

经测定 ,落叶松腮扁叶蜂蛹在自然条件下发育起点温度为 8.3 85 6℃± 0 .5 5 0 2℃ ;有效积温为 1 0 2 .5 41 9± 2 6.5 2 2 9日度。     

关于延吉市城市林业建设问题的几点建议

结合我国城市林业发展趋势及延吉市城市林业建设现状,提出了在推动延吉龙井图们经济一体化和吉林省东部中心城市发展过程中,要确立城市林业的重要地位、加快城市林业发展步伐、编制好城市林业规划、建设好全市森林生态网络体系、提高市民生态意识、加大城市林业建设投入、完善城市林业法律法规的建议。     

从我国木材资源的变化看普通刨花板的发展

分析了国内普通刨花板及其成套生产设备的现状及与国际先进水平的主要差距。通过对我国木材资源结构变化状况的论述，阐明了普通刨花板产业在我国的适应性以及发展趋势。介绍了苏福马公司在普通刨花板成套生产线设备发展中的实践及发展目标。     

黄土高原丘陵区定西县生态环境建设存在的问题和发展对策

对黄土高原丘陵区定西县生态环境建设的成果及生态修复工程存在的问题进行了阐述，并针对存在的问题提出了整个黄土丘陵区生态治理的发展对策。     

Effect of alley cropping on soil aggregate stability of a tropical Alfisol

The beneficial effect of organic matter on soil aggregate stability is well documented. Alley cropping has been suggested as a possible alternative to maintain soil organic matter content in cropping systems without fallowing the land. The objective of this study was to asses the effect of alley cropping on dry and wet soil aggregate stability on land degraded by shifting cultivation. The aggregate size distribution by dry sieving, aggregate stability by wet sieving, soil organic Carbon content and soil bulk density were measured following two and three years of alley cropping with Gliricedia (Gliricidia sepium) and Pigeon pea (Cajanas cajan) in a tropical Rhodustalf. Alley cropping increased the mean aggregate diameter and water stability of soil aggregates. The mean aggregate diameter obtained from dry sieving increased from 1.3 mm of the control to 2.68 and 3.11 mm after three years in Pigeon pea and Gliricidia alley cropped plots, respectively. This is an indication of resistance to wind erosion in alley cropped plots. The wet aggregate stability which shows the resistance to erosion by water also increased in alley cropped plots. These increases were significant after three years of hedge row establishment. The increase in soil organic C in alley cropped plots contributed to the higher dry and wet aggregate stability, and decreased soil bulk density. The improvement was higher in plots alley cropped with Gliricidia than Pigeon pea. This study shows the importance of ally cropping in increasing aggregate stability of degraded sandy soils which in return reduce erosion by wind and water.     

福建经济竹种开发利用与竹业经济发展对策研究

本文论述了福建主要经济竹种资源及其分布特点、经营利用现状与存在的问题,并探讨了市场经济条件下,经济竹种开发利用与竹业经济的发展对策。     

发展观赏竹种繁荣沿海经济

从观赏竹的外形特征、内涵意义以及在园林绿化、园林建筑上的应用等方面对其观赏、利用价值作了论述;对在沿海地区发展观赏竹林的必要性及有利的自然、经济条件作了具体分析;将沿海地区(以福建为例)的观赏竹分为4大类进行具体应用;对在沿海地发展观赏竹种,繁荣沿海经济提出建议。     

酸角生产的现状及其开发意见

酸角为豆科酸豆属植物，原产非洲，引种云南已有７００～８００年历史，适於云南干热河谷地区生长。因种种原因过去没有得到应有的重视和发展，近年来随饮料、食品工业的发展，酸角饮料、酸角酱、浓缩果汁等被相继开发应市，导至资源不足。作者对酸角生产中存在的问题进行了调查并提出了今后开发利用的意见。     

宁夏苹果的生产现状及发展对策

介绍了世界苹果的生产和贸易状况以及我国苹果的生产、需求和市场前景，在分析宁夏苹果生产现状和问题的基础上，提出了宁夏苹果的发展对策 。     

鼎湖山生态旅游深层次开发策略

鼎湖山有得天独厚的生态旅游资源等待开发。作者根据鼎湖山生态旅游业的现状，提出了鼎湖山生态旅游深层次开发的设想，应以森林旅游为龙头，形成主题丰富的森林旅游产品；同时应着力开发文化生态旅游及土特产生态旅游系列产品。并从生态旅游规划，资源保护与管理、生态旅游产业、生态教育和市场促销等角度提出了建设性的建议。