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Two-dimensional pattern analysis on dominant species and community in subalpine meadow of Luya Mountain,Shanxi Province,China

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Frontiers in Biology 2007年第2期2卷 205-209页

作者： zhang jintun College of Life Sciences Beijing Normal UniversityBeijing 100875China

The spatial pattern analysis of population and community is important to understand community structure and has become one key topic in modern plant *** are many techniques for analyzing one-dimensional pattern in ecological ***-dimensional pattern analysis is better than one-dimensional analysis in the study on commu-nity spatial characteristics and ***,it is hard to analyze these two-dimensional patterns due to poor effective *** two-dimensional sampling using two transects that meet at right angles was applied to get quadrat data in this *** then the data from the two transects were analyzed separately by one-dimensional pattern analysis method,two-term local quadrat *** length,width,and area of patches at different scales of pattern for populations were obtained from the *** community pattern,detrended correspondence analysis(DCA)was employed to summarize the species information firstly,and then the first DCA axis scores were analyzed to check its *** application of this method to the pattern analysis on dominant populations and community for subalpine meadow(*** viviparum+Carex rigescens+Kobresia bellardii)in the Luya mountains showed that it could release the characteristics of spatial pattern clearly and was a very effective *** method is easy to use and saves time with obvious advantages,compared with the two-dimensional pattern analysis methods presented in the *** the study meadow,the patterns of the main dominant species,Polygonum viviparum,Carex rigescens,and Kobresia bellardii,were apparent and comparatively regular in shape with large areas of patches at the same scale compared with other species such as Festuca *** Thalictrum *** were two or three scales of patterns for each plant population *** was related to population features,the interaction with environmental factors,and their dominant position in the community.

关键词： population distribution spatial pattern community structure quantitative methodology two-dimensional pattern analysis

Point pattern analysis of different age-classes of Larix principis-rupprechtii in Luya Mountain Reserve,Shanxi Province,China

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Frontiers in Biology 2007年第1期2卷 69-74页

作者： zhang jintun MENG Dongping College of Life Sciences Beijing Normal UniversityBeijing 100875China Institute of Loess Plateau Shanxi UniversityTaiyuan 030006China

Larix principis-rupprechtii forest is an important vegetation formation and has a large distribution area in Luya Mountain Reserve,*** pattern analysis on individual trees in different age-classes of Larix principis-rupprechtii was made in this ***,we employed the technique of point pattern analysis,which could analyze pat-terns under all scales along a *** was based on spatial mapped points of individual *** results of this study showed that the densities of the five age-classes varied in the order:age-class 3>age-class 4>age-class 5>age-class 2>age-class *** age-classes 1 and 2 have much fewer individuals than other three age-classes do,the popula-tion was stable at ***,it would be necessary to take some measures for improving population regeneration for a long-time *** individuals of all age-classes focused on clumping distribution in space;however,their distribution pattern varied with the change of *** mainly depended on biological features of Larix principis-rupprechtii and forest environments,but it also meant that the scale was an important factor in controlling spatial distribution pattern of tree *** feature of clumping distribution became more significant with the increase of *** relationships between individuals in different age-classes were almost all significantly correlated with each *** associations became more significant within the older *** suggested that the individuals of different age-classes were interdistributed,by which the population could get benefits in resource *** technique of point pattern analysis is effective and easy to be used in species pattern *** results are more closer to the reality,especially for community structure.

关键词： population pattern Larix principis-rupprechtii forest point pattern analysis age-class historical factors

Application of self-organizing neural networks to classification of plant communities in Pangquangou Nature Reserve, North China

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Frontiers in Biology 2008年第4期3卷 512-517页

作者： jintun zhang Hongxiao YANG College of Life Sciences Beijing Normal UniversityBeijing 100875China

Vegetation classification is an important topic in plant ecology and many quantitative techniques for classification have been developed in the *** artificial neural network is a comparatively new tool for data *** self-organizing feature map(SOFM)is powerful tool for clustering *** has been applied to many research fields and it was applied to the classification of plant communities in the Pangquangou Nature Reserve in the present *** Nature Reserve,located at 37°20′–38°20′ N,110°18′–111°18′ E,is a part of the Luliang Mountain ***-nine samples(quadrats)of 10 m×10 m for forest,4 m×4 m for shrubland and 1 m×1 m for grassland along an elevation gradient,were set up and species data was recorded in each *** discussion of the mathematical algorism,clustering technique and the procedure of SOFM,the classification was carried out by using NNTool box in MATLAB(6.5).As a result,the 89 samples were clustered into 13 groups representing 13 types of plant *** characteristics of each community were *** result of SOFM classification was identical to the result of fuzzy c-mean clustering and consistent with the distribution patterns of vegetation in the study area and shows significant ecological *** suggests that SOFM may clearly describe the ecological relationships between plant communities and it is a very effective quantitative technique in plant ecology research.

关键词： Neural network self-organizing feature map vegetation quantitative classification

Quartered neighbor method: A new distance method for density estimation

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Frontiers in Biology 2009年第4期4卷 574-578页

作者： Xunzhi ZHU jintun zhang College of Life Sciences Beijing Normal UniversityBeijing 100875China

Quantitative data are essential to an appro-priate characterization of *** the past few years,considerable attention has been paid to vegetation sampling techniques.A number of methods have been developed for plant density estimations that utilize spacing distances instead of fixed-area *** this paper,we review the main distance methods for estimating density and propose a new distance method denominated the quartered neighbor *** this method,the sampling point is considered the center,and the area around it is divided into four *** distance from the closest individual in each quadrant to its closest neighbor in the same quadrant is measured,and the average of them is the distance we *** is actually an integration of two old distance methods,the nearest neighbor method,and the point-centered quarter *** our new method and an old distance method(the point-centered quarter method),we calculated the average spacing distances of the Larix principis-rupprechtii population in the larch forests of the Donglingshan *** the two methods with the quadrat method,we found they were almost the same in accuracy,but the precision of the new one was ***,it is adequate in sampling intensity and adaptable for general use in rapid ecological survey work.

关键词： plotless sampling quadrat method point-centered quarter method Larix principis-rupprechtii

Quantitative analysis of endangered Acanthopanax senticosus communities in Dongling Mountain of Beijing

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Frontiers in Biology 2008年第4期3卷 507-511页

作者： Yun XU jintun zhang College of Life Sciences Beijing Normal UniversityBeijing 100875China

Based on the survey of community plots,a quantitative analysis of endangered Acanthopanax senticosus communities in Dongling Mountain was performed with two way indicator species analysis(TWINSPAN),detrended correspondence analysis(DCA)and canonical correspondence analysis(CCA).The communities of *** were classified into 9 types by TWINSPAN and the results were validated by *** the DCA graph,the first axis reflected the gradient of altitude and the second axis reflected the aspect and *** of *** were distributed in the thick forests at a high altitude with little *** the exception of being a dominant species of shrub layers in a few communities,*** has a relatively scarce *** accordance with DCA,the results of CCA also show the trend that the distribution of *** communities varied along with the gradient change of environmental *** and light are the main factors affecting *** growth.

关键词： endangered plant Acanthopanax senticosus classification of community ordination

Spatial hints of forest ecotone indicating forest succession, a case of larch forests in Baihuashan Reserve, north China

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Frontiers in Biology 2009年第4期4卷 523-530页

作者： Hongxiao YANG jintun zhang Bin XU College of Life Sciences Beijing Normal UniversityBeijing 100875China College of Resources and Environment Qingdao Agricultural UniversityQingdao 266109China

In cold or alpine areas of northern China,birch forests and larch forests are the two primary forest *** forests are also characteristic of a south branch of boreal forests in *** ecologists argue that larch forests can replace birch forests,but this still remains a question due to fragmentary or short *** ecotone between a larch forest patch and a birch forest patch is the arena in which the two species interplay and compete with each other,and studies of these areas are meaningful to understanding forest *** the alpine area of the Baihuashan Reserve,northern China,we sampled a larch-birch forest ecotone with eight plots in four transects and then analyzed population structures of larches and *** results show that the edges of the larch forest patch are composed of many larch saplings or young trees,but the edges of the birch forest patch are mainly composed of old *** the ecotone,the larches,on average,are taller than the *** facts suggest that larch saplings can permeate into birch forest patches,probably by seed dispersal,germination,success-ful competition and growth,but birch saplings cannot permeate into larch forest ***,on the ecotone,larch forest patches can steadily expand by unceasing permeation into birch forest patches,whereas birch forest patches progressively recede due to ultimate death of the old and poor recruitment of the *** forest patches replace birch forest patches in a stepwise manner,causing succession from birch forests to larch *** study not only confirms that larch forests can naturally replace birch forests,but also introduces a simple and reliable method,employing spatial hints,to study forest ***,the findings are of benefit to cultivation or development of larch forests in cold or alpine areas of the North Temperate Zone,which can be a huge carbon sink.

关键词： boreal forest forest ecotone population structure spatial dynamics forest succession

Development of plant communities after restoration of the Antaibao mining site, China

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Frontiers in Biology 2009年第2期4卷 222-227页

作者： Xiaoyu GUO Guilian zhang Huili GONG Kaiyun WANG jintun zhang Key Laboratory of Resource Environment and Geography Information System College of ResourceEnvironment and TourismCapital Normal UniversityBeijing 100037China Chinese Academy of Science-Max Planck Society Partner Institute for Computational Biology Shanghai Institutes for Biological SciencesChinese Academy of SciencesShanghai 200031China College of Life Sciences Beijing Normal UniversityBeijing 100875China

To investigate the dynamic changes in the artificial vegetation in an abandoned mining site,we analyzed the re lationships among community types,environmental variables and community structure in the process of vegetation restoration in the Antaibao mining site,China by survey of the communities and use of biological dating *** means of the quantitative classification method(two-way indicator-species analysis,TWINSPAN)and the ordination technique(de-trended correspondence analysis,DCA;and de-trended canonical correspondence analysis,DCCA),the plant communities were classified into seven groups:community I,Robinia pseudoacacia+Pimus tabulaeformis-Caragana kor-shinskii-Agropyron cristatum;community II,Robinia pseudoacacia-Hippophae rhamnoides-Artemisia capil-laries;community II,Ulmus pumila-Elaeagmus angu-stifolia-Artemisia capillaries;community IV,Caragana korshinskii-Agropyron cristatum+Artemisia capillaries;community V,Hippophae rhamnoides-Elymus dahur-icus;community VI,Elaeagnus angustifolia+Hippophae rhamnoides-Brassica jucea;community VII,Hippophae rhammoides+Elaeagnus angustifolia-Salsola *** conclude that the community types and diversity are mainly influenced by the succession time and the soil organic matter *** forest community is more adaptable to the special inhabitation than the shrub community.

关键词： mining site plant community succession recovery of vegetation restoration ecology species diversity Shanxi

Examining residual spatial correlation in variation partitioning of beta diversity in a subtropical forest

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Journal of Plant Ecology 2019年第4期12卷 636-644页

作者： Ke Cao Xiangcheng Mi Liwen zhang Haibao Ren Mingjian Yu Jianhua Chen jintun zhang Keping Ma Key Laboratory of Biodiversity Sciences and Ecological Engineering Ministry of EducationCollege of Life SciencesBeijing Normal UniversityBeijing 100875China State Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of Sciences20 NanxingcunXiangshanBeijing 100093China Key Laboratory of Coastal Zone Environmental Processes Yantai Institute of Coastal Zone ResearchChinese Academy of SciencesYantai 264003China College of Life Sciences Zhejiang UniversityHangzhou 310058China College of Chemistry and Life Sciences Zhejiang Normal UniversityJinhua 321004China

Aims The relative roles of ecological processes in structuring beta diver-sity are usually quantified by variation partitioning of beta diversity with respect to environmental and spatial variables or gamma ***,if important environmental or spatial factors are omitted,or a scale mismatch occurs in the analysis,unaccounted spatial correlation will appear in the residual errors and lead to re-sidual spatial correlation and problematic *** Multi-scale ordination(MSO)partitions the canonical ordination results by distance into a set of empirical variograms which charac-terize the spatial structures of explanatory,conditional and residual variance against *** these variance components can be used to diagnose residual spatial correlation by checking assump-tions related to geostatistics or regression *** this paper,we first illustrate the performance of MSO using a simulated data set with known properties,thus making statistical issues *** then test for significant residual spatial correlation in beta diversity analyses of the Gutianshan(GTS)24-ha subtropical forest plot in eastern *** Findings Even though we used up to 24 topographic and edaphic variables mapped at high resolution and spatial variables representing spa-tial structures at all scales,we still found significant residual spatial correlation at the 10 m×10 m quadrat *** invalidated the analysis and inferences at this *** also show that MSO pro-vides a complementary tool to test for significant residual spatial correlation in beta diversity *** results provided a strong argument supporting the need to test for significant residual spatial correlation before interpreting the results of beta diversity analyses.

关键词： beta analysis residual spatial correlation spatial scale canonical ordination multi-scale ordination variation partitioning

A Technique to Analyse Succession Data from Permanent Plots

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生物数学学报 1996年第4期11卷 1-5页

作者： zhang jintun（Department of Biologicaal Science,Shanxi University,Taiyuan 030006）

Data from vegetation succession study is usually a matrix of plot × species × *** is difficult to analyse this kind of data at present.A simple technique,clustercentering ordination is described in this paper,which can be used to analyse such a matrix *** data of 5 permanent plots in 7 years of inlands and grasslands in Kootwijki,the Netherlands,is analysed using this method as an application *** results obviously illustrate the trend,direction and speedof community succession and can be easily *** suggests that clustercentering ordination is an effective and time-saving technique in study of vegetation succession.

关键词： Vegetation succession Numerical methods Permanent plots Clustercentering ordination