试论国家森林资源连续清查体系的建设

简要回顾了国家森林资源连续清查体系的发展里程 ,客观总结和分析了连清体系的成就和存在的问题 ,就国家森林资源连续清查体系未来的发展提出了建议     

GPS在森林资源连续清查中的应用

对森林资源连续清查传统定位方法所引起的样点定位误差进行了全面分析，详述了GPS在森林资源连续清查中的具体应用及注意的问题。     

辽宁省国家森林资源连续清查系统及其应用

本文阐述了基于PDA技术的森林资源连续清查系统的主要功能,介绍了该系统在辽宁省国家森林资源连续清查中的应用方法及效果。     

新疆森林资源连续清查方法初探

文章总结了6次新疆森林资源连续清查取得的成果与存在的问题,提出了解决问题的主要方法,并对今后新疆森林资源连续清查需要改进的方面进行了初步的探索。     

GPS在森林资源连续清查中的应用

通过分析森林资源连续清查的重要性及GPS在该项工作中应用的目的,总结了GPS在森林资源连续清查中应用的经验,对GPS在未来森林资源连续清查中的发展趋势进行了探讨。     

江西省森林资源连续清查体系改革有关问题的探讨

江西省１９９６ 年省级连清体系复查与 Ｃ Ｐ Ｒ９１／１５１ 项目江西省试点是同步进行的，通过对老体系和试点建立新体系采用的有关技术进行分析对比，提出了有益的探讨意见。     

森林资源连续清查简介

论述了森林资源的重要性及森林资源连续清查的意义及内涵;并介绍了按照2003年国家林业局发布的《国家森林资源连续清查技术规定》,森林资源连续清查的主要调查内容。     

甘肃省森林资源连续清查体系的建立与完善

论述了甘肃省森林资源连续清查体系的建立及逐步完善的过程，分析了每次复查的技术特点及存在的问题，提出了进一步完善和优化森林资源连续清查体系的意见。     

全国森林资源连续清查成果数据库管理系统的研建

论述了国家森林资源连续清查(简称连清)成果数据库管理系统的建立方法。包括:全国连清数据、TM数据和基础地理信息数据处理方法及数据库的建立;以数据库、GIS、RS和Web技术为基础,设计开发了C/S和B/S两种结构的系统功能。该系统的建立满足了连清数据管理和信息查询两类用户的需求,为建立国家林业数据服务平台在技术和方法上作了有益的尝试。     

遥感技术在森林资源连续清查中的应用——以利用遥感技术分析森林植被、地类的动态变化为例

通过遥感技术在第六次连清工作中的应用实践,文章就利用遥感技术分析森林资源动态变化的空间分布,寻找森林资源动态变化的原因;利用卫星遥感数据从新的角度分析森林资源动态变化等方面进行了有益的探索。     

总结经验 再接再厉 努力提升森林资源连续清查水平

森林资源连续清查是依法监测全国森林资源消长和生态状况变化的林业基础性工作,其成果是制定和调整经济社会发展规划和林业生态建设方针政策的重要依据。我国已经完成六次全国森林资源连续清查,积累的许多经验值得总结,更要适应生态建设的需要,进一步加以保持和发扬,并提升到新的水平。     

Combining ALS and NFI training data for forest management planning: a case study in Kuortane,Western Finland

Forest inventories based on airborne laser scanning (ALS) have already become common practice in the Nordic countries. One possibility for improving their cost effectiveness is to use existing field data sets as training data. One alternative in Finland would be the use of National Forest Inventory (NFI) sample plots, which are truncated angle count (relascope) plots. This possibility is tested here by using a training data set based on measurements similar to the Finnish NFI. Tree species-specific stand attributes were predicted by the non-parametric k most similar neighbour (k-MSN) approach, utilising both ALS and aerial photograph data. The stand attributes considered were volume, basal area, stem number, mean age of the tree stock, diameter and height of the basal area median tree, determined separately for Scots pine, Norway spruce and deciduous trees. The results obtained were compared with those obtained when using training data based on observations from fixed area plots with the same centre point location as the NFI plots. The results indicated that the accuracy of the estimates of stand attributes derived by using NFI training data was close to that of the fixed area plot training data but that the NFI sampling scheme and the georeferencing of the plots can cause problems in practical applications.     

Evaluation of forest growth simulators with NFI permanent sample plot data from Finland

Tree-level and stand-level forest growth simulators and their combination were evaluated using data from a large network of permanent sample plots of the National Forest Inventory covering the whole of Southern Finland. The simulators were built up with the SIMO framework. The evaluation was carried out both at the stand-level and separately for Scots pine (Pinus sylvestris), Norway spruce (Picea abies), silver birch (Betula pendula) and white birch (Betula pubescens) strata within the plots. Effects of different factors, e.g. age, soil type, stand density and geographical location on the results were also analysed.     

Estimating forest carbon fluxes for large regions based on process-based modelling, NFI data and Landsat satellite images

The aim of this study was to develop and evaluate a new approach for estimating forest carbon fluxes for large regions based on climate-sensitive process-based model, national forest inventory (NFI) data and satellite images. The approach was tested for Central Finland and Lapland with NFI field data and daily weather data from 2004 to 2008.The approach combines (1) a light use efficiency (LUE) model, (2) a process-based summary model for estimating gross primary production (GPP) and net primary production (NPP), and (3) the Yasso07 soil carbon model, which together allow the estimation of net ecosystem exchange (NEE). Landsat TM 5 satellite images were utilized to generalize the carbon fluxes obtained for field sample plots for all forested areas using the k-NN imputation method. The accuracy of the imputations was examined by leave-one-out cross validation and by comparing the imputed and simulated values with Eddy covariance (EC) measurements.RMSE of the k-NN imputations was slightly better in Central Finland than in Lapland, the bias staying at a similar level. Based on the EC comparisons, the approach seemed to work rather well with GPP estimates in both areas, but in the north the NEE estimates were remarkably biased. The main advantages of the approach include its applicability to basic NFI data and a high output resolution (30 m).The method proved to be a promising way to produce carbon flux estimates based on large-scale forest inventory data and could therefore be easily applied to the whole of Northern Europe. However, there are still drawbacks to the approach, such as lacking parameters for peat lands. One of the future goals is to integrate the approach with an interactive mapping framework, which could thereafter be utilized, for example, in climate change research.     

不同森林资源监测体系数据协同性初步分析——以广东省为例

针对当前一类调查与二类调查监测成果不一致的问题,提出了利用大样地区划调查方案,开展一类调查和二类调查两个不同监测体系数据协同性分析,为衔接两类调查体系、产出森林资源“一套数”及实行“双增”目标责任制考核提供科学依据.     

云南省森林资源二类调查中的生长量计算分析

以云南省某县的森林资源规划设计调查数据为基础，利用森林资源连续清查的生长率数据及云南省已有各树种的生长率数据，对森林资源规划设计调查中的生长量计算问题进行探讨，分析存在差异的原因，提出相应的建议措施。     

集体林调查规划体系的中欧比较分析

以按照欧盟技术规程编制的湖南省永顺县万坪镇战略森林规划为例,从森林资源调查、编案单位选择、方案的深度和广度、方案的检查评定4个方面进行了中国和欧盟森林资源调查规划体系的比较分析.森林资源二类调查存在的主要问题是调查面积大、精度低;间隔期长,时效性差;调查因子单一,难以满足编案要求.森林经营方案存在的主要问题是编案单位面积广,实施难度大;方案内容单一,针对性差;方法落后,科学性不强;深度不够,方案的可操作性差.笔者从改进调查体系、缩小编案单位面积、扩展规划内容、加强森林经营措施规划、提高民众参与程度和高新技术应用力度等方面提出了我国集体林区森林经营方案的改革思路.     

浅析我国森林资源清查体系存在的问题与对策

全国森林资源清查是通过定期、准确查清各省的森林资源数量、质量及其消长动态,从而掌握森林生态系统的现状和变化趋势,对森林资源与生态状况进行综合评价。由于清查覆盖面积大、跨度时间长,清查结果不能有效及时利用。本文浅析了我国森林资源连续清查体系在应用中存在的不足,并提出改进措施,以期为完善我国森林资源连续清查体系提供参考。