森林主产利用计划系统编制工作初探

森林经营方案的编制与实施是提高森林经营水平的重要步骤。在编案中森林主产利用计划系统的编制是关键的工作。本文针对森林主产利用系统在编制过程中存在的问题，提出解决问题的途径、方法及其前景。     

中日森林文化比较研究及启示

日本是一个森林大国，拥有着丰富的森林资源和森林文化，其教训和经验对中国乃至全世界的后工业化国家都有着很大的启发和借鉴意义。对日本的森林状况进行回顾和评价，从其森林思想中汲取精华，不断挖掘森林文化所蕴藏的丰富含义，恢复和弘扬森林文化，这对中国正在开展的生态文明建设以及解决环境问题都能提供思考和帮助。     

祁连山水源涵养林综合效能的计量研究

以马克思级差地租理论,建立了祁连山水源涵养林综合效能的评价模型:E=E_d+E_e+E_s;以E与生产投资I的比值为计量水源林的效能指数T,T=E/I。并以祁连山寺大隆森林生态定位研究站实测资料和社会调查数据为计量评价参数,确定其经济评价指标体系和计量系统。结果表明:祁连山水源涵养林综合效能指标为11.93;其中生态效能和社会效能分别是直接经济效能的4.51倍和6.05倍。说明祁连山水源涵养林现行的保护、发展和综合利用的经营方针是正确的。建议河西各受益部门应按水资源效能总收入的0.5％缴作水源林再生产费,以确保国民经济建设的长远发展。     

浅谈国有林场森林分类经营

本文结合大兴安岭地区加格达奇林业局国有林场的实际经营情况，论述了国有林场实行森林分类经营的必要性、并对经营管理体制与措施进行了探讨。     

福建省林木良种繁育概况及今后工作设想

本文介绍了福建省林木种质资源的收集保存、研究利用，优良家系选育，树种内种源研究，高世代种子园研究，乡土树种栽培驯化，外来树种引种，提高种子园种子产量所采取的措施，无性繁殖技术等林木良种繁育概况；并就林木育种工作存在的问题及今后工作设想提出建设性意见。     

水土保持是山丘区经济发展的根本出路

水土保持是山丘区经济发展的根本出路肖秧（四川省人民政府，成都６１００００）四川地处长江上游，幅员辽阔，境内高山峻岭，江河纵横，是一个有一亿多人口的农业大省。由于历史原因，森林曾遭严重破坏，加之人口众多，人均耕地数量少，垦殖指数高，水土流失十分严重。遥...     

Deforestation patterns and their effects on forest patches

Five identifiable patterns of deforestation are recognized - internal, indentation, cropping, fragmentation, and removal - and each has a distinct effect on habitat quality of forest patches in the eastern United States. By overlaying land use maps from 1973 and 1981 for three counties in the State of Maryland (Prince Georges, Anne Arundel, and Wicomico), changes in the interior core area and edge length of individual patches were measured. Forest interior declined by 23.8 km² in Anne Arundel, 16.3 km² in Prince Georges, and 8.4 km² in Wicomico. Within Anne Arundel and Prince Georges Counties, deforestation increased edge length by 52.1 km and 31.2 km, respectively, whereas, within Wicomico, it decreased edge length by 8.7 km. Differences among counties resulted from current land use patterns, percentage of forest cover, and the dominant deforestation pattern.     

D-Dimer Improves the Prognostic Value of Combined Clinical and Laboratory Data in Equine Gastrointestinal Colic

The discriminating ability of 15 parameters alone or in combinations, including results from analysis of plasma endotoxin, the Nycomed plasma D-Dimer test and phospholipase A₂, were analyzed to predict morbidity and mortality in equine gastrointestinal colic. Endotoxaemia was a characteristic feature of the colic horses. The problem of adequately predicting non-survivors among colic horses required several parameters to be included in the logistic model: if the “classical parameters”, (heart rate, respiratory rate, PCV, anion gap) were included in the model, addition of plasma D-dimer, phospholipase A₂, and Cl^- significantly improved the predictive value of the logistic model. Increasing heart rate and D-dimer together with decreasing chloride was a risk factor for nonsurvival. The sensitivity of this three-parameter logistic model to predict nonsurvival was 78% and specificity 77%. The Nycomed D-Dimer test is recommended as a horse-site test to predict disseminated intravascular coagulation and nonsurvival in equine colic.     

林木资源消耗量估测方法的初步研究

本文主要通过应用统计学的有关知识,提出适应南方集体林区木材市场开放新格局的一种估测林木资源消耗量的方法;并将这种方法在沙县进行了实地验证;分析了其可靠程度与经济意义。     

河北省承德地区防护林体系林种结构的最佳模式

本文用线性规划方法,把以防护效益为主并满足社会需求作为约束条件,使防护林工程的费用最小作为目标,计算出了河北省承德地区防护林体系林种结构的61个方案。对不同情况,如资金不足、取得较好的经济效益、解决木材供需矛盾以及其它条件的变化等等,可以从61个方案中选出一个最佳方案。