This paper analyzes the community spatial structure by exmining the spatial distribution of trees,diameter distribution and spatial structure parameters(angle scale and mixed angle) of 4 different site conditions in Mengluan.The results show that the distribution of Birch is still unreasonable,with overgrown trees in the path order,and the signs of human disturbance are obvious.The value of the diameter distribution of q varies too much in four plots(1.2-1.5) except for plot 2(1.3-1.7).The distribution of larger diameter path-order trees vary even more;For plots 1 and 3,individual plot-scale distribution angle for the 0.483 and 0.502,respectively,was on the whole randomly distributed;the average angle for plots 2 and 4 were 0.583 and 0.532,whose horizontal distribution of trees characterizes Bulk distribution.Human and livestock activities on right its species composition and inter specific competition in the low angle of the impact of its mix,while irrational anthropogenic interference with the activities of the law contrary to natural succession tree species on the distribution of stand structure exert significant impact.

对小五台山自然保护区11种森林群落类型3个物种多样性指数和6个土壤养分指标等进行了典型相关分析.结果表明:物种多样性中的丰富度指数和多样性指数与土壤养分存在显著相关关系,并且都表现为与全N质量分数呈正相关,与pH值呈负相关.由此说明此地区土壤pH值和全N是森林群落植被多样性的限制性因子.

The application of dynamic models to predict the growth and harvest of trees or stands and evaluate forest health,as well as under different site conditions in the use of certain specific technical measures of forest stands after the dynamic changes in forest health has been the core issues of the evaluation and management.The dynamic model SIMPPLLE and MAGIS development in USA is mainly used to evaluate the current situation stands;simulate stand development and forecast the dynamic changes of the future under different stand management conditions;under different decision-making through the analysis of the harvest of forest vegetation conditions,choose the most optimized management measures and the implementation of measures to develop the time and place for optimal decision-making.For forest health assessment at the current stage in China,the issues such as establishing evaluation index system for the static evaluation,as well as lacking spatial information data and dynamic change model for forest health operation were existed.Thus,in the future we should carry out practical research according to the actual situation in China,develop dynamic forecasting model and decision-making model for the purpose of promoting the forest health manegement,increase the predictive power of forest health,and improve the integrated evaluation techniques for forest health system operation.

An analysis of environmental conditions in Xingtai City Park was conducted, according to the theory of planning urban green land and the knowledge of plant landscaping, an integrated park plan combining landscape appreciation, recreation and entertainment, and science and culture together was developed. Ecology and recreation as well as natural conditions were highlighted in the park. Different plant deployment patterns were adopted according to different functional configurations of the park, allowing match-up between the landscape and the plants, therefore to meet different needs of different people. The overall plan is featured with "4 more and 1 combination" i.e. more native species, more traditional landscaping trees, more old trees, and more landscaping patterns, and combination of natural and regulated patterns, making the park a comprehensive park for both recreation and entertainment.

Research on the analysis of sustainability of conversion of farmland to forest has draw worldwide social attention to deal the issue of long-term development in the district of conversion of farmland to forest and establish the lastingly effective mechanism.Taking Qianxi County as a study case,the sustainability of conversion of farmland to forest was studied by using the data from farmer household survey.It made a conclusion:The conversion of farmland to forest program didn't affect the crop grain yields,land use and agricultural structural adjustment are also rational,the economic income of the farmers has kept high speed and steady growth,and the farmer's thoughts has changed greatly,so there is extremely little possibility of destroying the forests.According to the conversion of farmland to forest,Qianxi County becomes sustainable development of ecology,economy and society.

The urban biodiversity is the important part of urban ecosystem.The paper makes each vegetation of green place in Baoding as target,analyze and compare the date come from survey and collecting.Result indicate the species in the urban focus in few big branch of study,for example Leguminosae,Gramineae,Composit and so on.the dominant species is concentrated.The herbages are most in life type,arbors are better,hardwood is the important role in plant community. The local trees have a bigger proportion in species origin,and the introduce species is also a important part of green place in Baoding.The mix of arbor,shrub and herbage is a mostly in apeak community.In different green place,the families,genera and specify in park is most abundant.the order of species is herbage,arbor,shrub,bine.The Pielou of arbor is highest,herbage is least,the diversity level of herbage layer is highest,arbor layer is least.In the end,the biodiversity protest of urban green place ask us not only a high Shannon-Wiener but also a high Pielou,and make good use of local species,introduce exotic species reasonably.

Volume estimation by radial basis function neutral network model based on RS and GIS was conducted on Larix principis-rupprechtii forest in Saihanba Jixie Forest Farm,Hebei province.Estimation was made on SPOT5 images by generalized regression of neural network in radial basis function neural network model,selecting main impact factors such as altitude,slope aspect,canopy density,SP1,SP3,SPl/2,SP1-2/1+2,SP2*3/1.The result showed that the highest precision of estimation of volume was 98.70% and the lowest one was 68.56%,averaging accuracy of 87.24%.It concluded that GRNN model had advantages of high efficiency,easy to calculate and operate for estimating forest volume.

Vegetation restoration of freeway profited the stability of the structure and the improving of landscape in the ecosystem of roadside slope.The paper puts forward the problems,by the analysis of the vegetation restoration technique of roadside slope in the freeway,such as behindhand conception,the plant selection and arrangement is unreasonable,the current-used norm and standard was not completely,the limited level of the professional and technical personnel,hard in maintaining management,and some corresponding strategies and suggestions are given,such as learning from the advanced foreign experiences,optimize the plant selection and arrangement,establish and implement technic the technique scheme,foster the professional and technical personnel,increase the recognition in vegetation restoration and strengthen the theoretical research,which is propitious to the popularization and perfection of the vegetation restoration skills and plays a important role in promote the restoration of ecosystem structure.

英国哥伦比亚省及加拿大在蒙特利尔进程的指标研究基础上,根据6项CCFM标准及47个SFM问题制定的指标等级框架广泛应用在国家水平上,同时合并的子指标仍能明确地应用在经营单位层次上,它将为政府在管理社会、经济和环境价值中提供权衡.针对目前中国森林可持续发展指标体系建设中的问题,提出了应根据国情及国际森林可持续发展指标,不断加强指标体系建设以及指标的量化和综合整理.同时,根据不同地区、不同领域的实践制定评价指标结构,正确处理好社会经济、生态、环境等利益.

利用银杏种子育苗是培育银杏苗木的最基本方法。采用播种育苗可有效降低苗木病虫害的发生,对提高苗木质量有显著效果,并能提高单位面积产量,降低生产成本,增加经济效益。