试论我国立地分类理论基础

我国立地分类必须根据我国自然地理背景及地域分异特点,建立起有自己特色的立地分类系统。我国自然条件即有纬度(水平)地带性热力分异,又有非纬度(水平)地带性——经度地带性干湿分异和地质、地貌分异。特别是地质、地貌分异是山区立地分类的重要依据。立地分类是一种逐级控制的分类系统,不同级别的划分,依据不同的主导因子,并为不同对象服务。造林区划是依据大尺度地域分异,即水热条件及巨地形,以及它们的次一级分异;立地类型,在山区是依据大、中、小地形,以及岩性和土壤容量、质量因素分类。我国立地分类和造林区划宜组成一个系统,分成五个等级单位,即: 造林区(或森林立地区、森林生长区) 造林地区(或森林立地地区、森林生长地区) 立地类型区立地类型组立地类型     

吉林省中东部用材林基地森林立地类型区区划的研究

森林立地类型区是立地分类系统中的中介单位,它是区划的最小单位,又是分类的高级单位。正确地划分立地类型区是立地类型划分、适地适树设计及立地质量评价的基础,也是各地制定林业战略方针和林业区划的依据。森林立地类型区是构成森林生态环境的水、热、光、土壤、地质地貌等因子具有相对一致性和同等森林生产潜力的地域。同一立地类型区可以由于地貌形态的影响,在分布上不连续。１研究地区自然概况吉林省中东部用材林基地,位于东径１２５～１３１°,北纬４１～４５°之间。南以辽宁省为界,北邻黑龙江省,东至国界与朝鲜苏联相望,西…     

浙江省毛竹立地分类和评价

本文是《浙江省毛竹区划研究》课题的一部分。根据《中国森林立地分类》系统的立地分类方法,按我省毛竹各适宜区域,划分出10个立地类型小区,25个立地类型组,59个立地类型,并进行立地类型的归类、分级和立地质量评价。同时根据数量化理论Ⅱ,利用148块经营水平基本一致的固定样地和标准地材料,编制了我省毛竹胸径数量化得分表。     

东北山地的森林立地区划

森林立地区划是森林立地分类、评价及适地适树的基础,不仅有理论意义,而且也有很大的实用价值。本文根据生态学、地域分异、主导因子原则,把东北山地森林划分为2个森林立地带,3个森林立地区,8个森林立地分区,16个森林立地类型区,对每个森林立地类型区的位置、地形、地貌、土壤、岩石、植被、树种分布等,均进行了详尽地描述。     

论森林立地分类的若干问题

本文着重论述森林立地分类的依据原则和分类系统。森林立地分类的依据是森林立地生产力,包括现实生产力、集约经营生产力和潜在生产力,以及适宜性(包括限制性)。森林立地分类的原则:1.构成森林立地的自然因子及其组合的一致性;2.森林立地生产力水平和宜林性质的近似性;3.森林立地发生与形成因子及限制因子的一致性;4.森林立地发展阶段和经营方向的一致性。森林立地分类系统:森林立地地区,森林立地区,森林立地级,森林立地类型组,森林立地类型和植物群落型。     

建立在立地分类基础上的森林立地质量评价研究

1 概述森林立地分类和质量评价的研究已有了近一个世纪的历史,这期间世界主要林业大国依据本国的森林经营现状、集约经营强度、现代化分析计算手段的不断采用,以及对森林立地分类系统、立地质量评价概念的理解,建立了不同的森林立地分类系统和立地质量     

半干旱风沙区立地类型划分与抗逆树种选择

立地类型划分与抗逆树种选择是半干旱风沙区适地适树造林的技术关键。通过对山西省森林立地类型系统的分类,区划出半干旱风沙区的土石山、黄土丘陵、盆地河滩3种立地类型小区,从中划分出9种立地类型亚区和20种立地类型,并根据不同立地类型的特征、指示植物种类和近60 a来人工造林树种的生态适应性,提出了不同立地类型抗逆树种的选择。     

森林立地分类原理的探讨

立地分类与立地区划为两个并列的系统,二者不能混淆。除提出了一般原则外,还确定了立地分类的四大依据:1.立地基底;2.立地形态结构;3.生物气候肥力;4.立地表层特征。立地分类系统、立地系列、立地纲、立地目、立地类型组、立地类型(亚型)。规定了立地目-立地类型组-立地类型(亚型)的三名法命名法则,并列举了幕阜山立地分类的范例。     

建立基础立地分类的初步设想

一、前言立地分类是森林经营必不可少的基础,也是林业区划的重要依据。根据立地分类,能够鉴别现在与将来立地的生产力,能够选择生产力最高的造林树种和适当的育林措施,以保地尽其力,施其所当。     

全国森林立地分类与评价学术讨论会圆满结束

由中国林学会森林生态专业委员会和林业区划研究会共同组织和主持的建国以来第一次森林立地分类与评价学术讨论会,于1985年10月29日—11月4日,在贵阳市召开。全国18个省、市的科研、教学,调查设计及生产部门的70位代表参加了会议。会议共收到论文55篇,并进行了交流。其中有一部分论文,已开始对我国立地分类与评     

对我国森林立地分类与评价问题的几点看法

本文首先回顾了国内一些学者近期有关森林立地分类和评价方面学术争论的要点,然后提出我国立地分类和评价应遵循的原则和方法,并着重论述在一个局部地区应如何抓住地形和土壤这两大因素在立地类型划分和评价中的重要性。     

Site classification of the eastern forest region of Daxing''''an Mountains

StudysiteThestudysiteislocatedintheeasternslopeofDaxing'anMountains(47"25'~49'37'N,119'37'-122"45'E),whichbelongstotheBalinForestryBu-reauofNeiMenggol.ThemaintopographyislowermountainsandhilIs.Thealtitudeis4oo~1ooom.Theannualaccumulativetemperature(>=1oC)isabout1845oC.AnnuaIprecipitationis42omm.Annualaveragetemperatureis-15t.Thefrost-freeperiodis97d.lnthisarea,thezonalsoilisbrownconiferousforestsoil,theothertypeofsoilismeadowsoilandbogsoiI.ThemainfundamentaIrockisgrinite.ThebasaItisse…     

Site classification of the eastern forest region of Daxing’an Mountains

Based on the plot data from the investigation and the theory of forest ecology and ecological system, the site classification of the eastern forest region of Daxing’an Mountains was made by mean of mathematical method. The main factors were slope, thickness of soil layer, slope position and slope aspect. Grades of slope were used as the division standard for site type group. The slope aspect, slope position and thickness of soil layer were used as the division standards for site type. Altogether 7 site type groups and 15 main site types were determined the region. It provided reliable fundamental basis for the reasonable management and planting design in the area. Responsible editor: Zhu Hong     

SITE CLASSIFICATION FOR PROTECTIVE FOREST AFFORESTATION ON THE COAST OF CHINA

Land for protective forest on the coast has special site conditions,and siteclassification is the scientific basis for seaboard afforestation.The site classification systemon the coast zone and islands of China may be classified into five levels-site region(sub-region),district,class,group,and type.The land division for afforestation is carried outby the principle of enviornmental heterogeneity among regions,sub-region and district onlarge scale,according to the difference of air temperature,moisture and type of coastgeomorphy.It may be classified into 7 regions,12 sub-regions and 55 districts.Themedium and small scaled division for site class,group and type,subdivided in a sitedistrict,are based on medium topography,topographic climate,micro-relief and soil conditions.     

立地分类与评价研究现状

森林立地分类和评价是林业生产规划、野外作业设计、施工造林、育林营林等重要生产过程中的基础工作之一,同时是因地种树和促进林地生产力及林业绿色健康平稳发展的关键,对提高林木质量、持续发展高效林业、恢复改造森林结构和扩大森林资源等都具有十分重要的意义。本文系统地综述了立地分类和立地质量评价的国内外研究现状及相应的特征。同时基于遥感信息技术发展与应用,结合前人的具体研究案例对立地分类与评价进行了分析和总结。总的来看,运用遥感信息技术进行立地分类与评价不仅能提高精确度及客观性,而且更便捷快速。未来将更依靠计算机技术和遥感信息技术,向包含多因子、多层次的综合性立地分类和评价发展。     

长茂滩林场固沙造林调查研究

用主导因子法划分了定边县长茂滩林场的立地条件类型，用定量分析和定性描述相结合的方法，研究了各乔、灌树在各种立地条件类型上的生长状况，林学特性，固沙效益等。提各种树适宜的立地条件及各立地条件下适选的树种，林型（林带或片林）及造林方式。     

安徽亳县泡桐立地质量评定

本文在分析林木直径和树高的相关性的基础上,结合平原农区地形地貌特征,以林分内最大径阶木的平均胸高直径代替优势木的平均树高作因变量,以林分平均林龄和土壤种类、土层厚度、地下水位、株距等定性因子作为自变量,分别编制出安徽省亳县泡桐人工林地位指数表和数量化地位指数表,并在此基础上将泡桐人工林划分为14个立地类型。该项研究对于探讨平原农区主要树种有关经营数表的编制方法、立地类型划分和林木生长预估等具有普遍意义。     

A soil-based aspen productivity index for Minnesota

An index, based on soil properties as defined by soil mapping unit and positively related to growth of quaking aspen (Populus tremuloides Michx.) in Minnesota (the aspen productivity index—APX), was developed. Aspen grows on a wide variety of soils and comprises the majority of roundwood harvest in the state. The APX was to be included in an existing information system, and the soil properties used were restricted to those in an established database. There were no co-collected forest measurements. Response curves relating aspen productivity to soil and site properties, scaled from 0.0 to 1.0, were initially developed using the abundant information in the literature and were then iteratively adjusted. Properties were aggregated into three categories; by their effects on water availability, nutrient availability, and by other (site) factors that affect growth. The APX was evaluated and validated by comparison to generalized forest productivity ratings in published soil surveys and with spatially referenced forest measurements collected at three different intensities, including a national inventory (FIA). The APX agreed well with the generalized forest productivity ratings, including both productivity classes and estimated aspen mean annual increment. Multiple and variable forest measurements within mapping units, but a single APX, reduced the explanatory power of relationships. Despite that, the APX differed significantly among productivity classes established by the FIA and those based on relative stocking. Regressions with APX as the independent variable and mean basal area and site index by mapping unit, weighted by frequency, as the dependent variable were statistically significant for basal area for all datasets and for site index for the FIA data. The relationships, evaluated over the range of the APX in the FIA dataset, predict differences in total aspen yield of about 50% in 50 years. The APX is being used to provide comparative forest productivity information for all soil mapping unit components in Minnesota (about 5800 units).