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New approach to calculating tree height at the regional scale

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Forest Ecosystems 2021年第2期8卷 311-329页

作者： Congrong Li Jinling Song Jindi Wang State Key Laboratory of Remote Sensing Science Jointly Sponsored by Beijing Normal University and Aerospace Information Research Institute of Chinese Academy of SciencesFaculty of Geographical ScienceBeijing Normal UniversityBeijing 100875China Key Laboratory of Digital Earth Science Aerospace Information Research Institute Chinese Academy of SciencesNo.9 Dengzhuang South RoadBeijing 100094China

Background:Determining the spatial distribution of tree heights at the regional area scale is significant when performing forest above-ground biomass estimates in forest resource management *** geometric-optical mutual shadowing(GOMS)model can be used to invert the forest canopy structural parameters at the regional ***,this method can obtain only the ratios among the horizontal canopy diameter(CD),tree height,clear height,and vertical *** this paper,we used a semi-variance model to calculate the CD using high spatial resolution images and expanded this method to the regional *** then combined the CD results with the forest canopy structural parameter inversion results from the GOMS model to calculate tree heights at the regional ***:The semi-variance model can be used to calculate the CD at the regional scale that closely matches(mainly with in a range from-1 to 1 m)the CD derived from the canopy height model(CHM)*** difference between tree heights calculated by the GOMS model and the tree heights derived from the CHM data was small,with a root mean square error(RMSE)of 1.96 for a 500-m area with high fractional vegetation cover(FVC)(i.e.,forest area coverage index values greater than 0.8).Both the inaccuracy of the tree height derived from the CHM data and the unmatched spatial resolution of different datasets will influence the accuracy of the inverted tree *** the error caused by the unmatched spatial resolution is small in dense ***:The semi-variance model can be used to calculate the CD at the regional scale,together with the canopy structure parameters inverted by the GOMS model,the mean tree height at the regional scale can be *** study provides a new approach for calculating tree height and provides further directions for the application of the GOMS model.

关键词： Geometric-optical mutual shadowing(GOMS)model Semi-variance model Canopy diameter Tree height regional scale

A GIS-based Modeling Approach for Fast Assessment of Soil Erosion by Water at regional scale, Loess Plateau of China

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Chinese Geographical Science 2010年第5期20卷 423-433页

作者： HU Llangjun YANG Haijun YANG Qinke LI Rui Key Laboratory for Vegetation Ecology of Ministry of Education Northeast Normal University Changchun 130024 China Institute of Soil and Water Conservation Chinese Academy of Sciences Yangling 712100 China

The objective of this study is to develop a unique modeling approach for fast assessment of massive soil erosion by water at a regional scale in the Loess Plateau, China. This approach relies on an understanding of both regional patterns of soil loss and its impact factors in the plateau area. Based on the regional characteristics of precipitation, vegetation and land form, and with the use of Landsat TM and ground investigation data, the entire Loess Plateau was first divided into 3 380 Fundamental Assessment Units （FAUs） to adapt to this regional modeling and fast assessment. A set of easily available parameters reflecting relevant water erosion factors at a regional scale was then developed, in which dynamic and static factors were discriminated. Arclnfo GIS was used to integrate all essential data into a central database. A resulting mathematical model was established to link the sediment yields and the selected variables on the basis of FAUs through overlay in GIS and multiple regression analyses. The sensitivity analyses and validation results show that this approach works effectively in assessing large area soil erosion, and also helps to understand the regional associations of erosion and its impact factors, and thus might significantly contribute to planning and policymaking for a large area erosion control in the Loess Plateau.

关键词： soil erosion by water G/S-based modeling soil erosion assessment regional scale Loess Plateau

AN INSIGHT ON DRIVERS OF LAND USE CHANGE AT regional scale

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Chinese Geographical Science 2006年第2期16卷 176-182页

作者： SHAO Jing-an WEI Chao-fu XIE De-ti College of Resource and Environment Southwest University Chongqing 400716 P. R. China Chongqing Key Laboratory of Digital Agriculture Chongqing 400716 P. R. China

The studies of driving forces of regional land use change (LUC) are to reveal the real motivation behind the LUC and its interacting mechanism, so as to simulate and predict the process of LUC. Presently, studies rooting from different natural and socio-economic backgrounds and from different scales have deepened the people’s understanding and cognition to driving forces of regional LUC. Biophysical driving forces are relatively stable, and have the cumulating effects. Human driving forces are relatively active, and are main driving forces of short-term regional LUC. Existing regional LUC models can answer the three main problems: which contribution (why), which location (where) and what rate (when). But, regional land use system is defined as the self-organized system, usually affected by the cri- tical value area and sudden change, and controlled by different stages. To reduce the impact of critical threshold and break on land use system, the studies of LUC driving forces will aim at following priority areas: data linkage between remote sensing and no-remote sensing data; underlying driving force identification; driving factor quantification; driving factor scale dependence; and driving process integration simulation.

关键词： land use change driving forces driving mechanism process simulation regional scale

3D Model Construction and Ecological Environment Investigation on a regional scale Using UAV Remote Sensing

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Intelligent Automation & Soft Computing 2023年第8期37卷 1655-1672页

作者： Chao Chen Yankun Chen Haohai Jin Li Chen Zhisong Liu Haozhe Sun Junchi Hong Haonan Wang Shiyu Fang Xin Zhang School of Geography Science and Geomatics Engineering Suzhou University of Science and TechnologySuzhou215009China State Key Laboratory of Remote Sensing Science Aerospace Information Research InstituteChinese Academy of ScienceBeijing100101China School of Information Engineering Zhejiang Ocean UniversityZhoushan316022China Marine Science and Technology College Zhejiang Ocean UniversityZhoushan316022China China Aero Geophysical and Remote Sensing Center for Natural Resources Beijing100083China

The acquisition of digital regional-scale information and ecological environmental data has high requirements for structural texture,spatial res-olution,and multiple parameter categories,which is challenging to achieve using satellite remote *** the convenient,facilitative,and flexible characteristics of UAV(unmanned air vehicle)remote sensing tech-nology,this study selects a campus as a typical research area and uses the Pegasus D2000 equipped with a D-MSPC2000 multi-spectral camera and a CAM3000 aerial camera to acquire oblique images and multi-spectral *** professional software,including Context Capture,ENVI,and ArcGIS,a 3D(three-dimensional)campus model,a digital orthophoto map,and multi-spectral remote sensing map drawing are realized,and the geometric accuracy of typical feature selection is *** on a quantitative remote sensing model,the campus ecological environment assessment is performed from the perspectives of vegetation and water *** results presented in this study could be of great significance to the scientific management and sustainable development of regional natural resources.

关键词： Unmanned air vehicle multi-spectral camera oblique photography 3D model construction ecological environment investigation regional scale

Assessment of the effects of the shelterbelt on the soil temperature at regional scale based on MODIS data

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Journal of Forestry Research 2011年第1期22卷 65-70页

作者： DENG Rong-xin LI Ying ZHANG Shu-wen WANG Wen-juan SHI Xiao-liang Northeast Institute of Geography and Agriculture Ecology CASChangchun 130012 China. Graduated School of Chinese Academy of Science Beijing 100049China Department of Resources and Environmental Sciences Henan Universityof Finance and Economics Zhengzhou 450002 China

At present, the most researches on the protected effect of shelterbelt are on the basis of the two scales of forest belts and networks. However, with the further research on the global environmental change, more attention was paid to the regional climate effect of shelterbelt. In present study, we analyzed the temperature effect of the shelterbelt at regional scale by using the land surface temperature （LST） data from the moderate resolution imaging spectroradiometer （MODIS） at Yushu, Nong＇an, Dehui, and Fuyu in Jilin Province of China from March to October in 2008. Results show that the shelterbelt can increase the soil temperature of the protected farmland as compared with no shelterbelt zone, with the increment of 0.57oC per day in fine shelterbelt and 0.38oC per day in the normal shelterbelt. Moreover, the correlation analysis of the air temperature, precipitation and the soil type and the shelterbelt effect shows that the air temperature and precipitation are negatively correlated with the shelterbelt effects, that is, the more the temperature and precipitation are, the less the effect produced. While the impact of the soil types on the shelterbelt＇s effect is not very obvious as a whole. This paper draws significance in terms of analyzing the effects of the shelterbelt on the soil temperature at regional scale utilizing the remotely sensed data and GIS technique.

关键词： regional scale remote sensing shelterbelt temperature effect

Evaluation of Land-Use Efficiency Based on regional scale——A Case Study in Zhanjiang,Guangdong Province

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Journal of China University of Mining and Technology 2007年第2期17卷 215-219页

作者： CHEN Shi-yin LIU Yao-lin CHEN Cui-fang College of Resources and Environmental Science Wuhan University Wuhan Hubei 430079 China College of Agriculture Guangdong Ocean University Zhanjiang Guangdong 524088 China

Evaluating land use efficiency is critical to the revision of general land use planning. An assessment indicator system for regional land use efficiency was established in this paper from the aspects of society,economy,ecology and environment. The weight of each indicator was defined by an analytical hierarchy process (AHP) and the entropy method (EM). Then,a case study in Zhanjiang was carried out to analyze the regional land use efficiency from 1996 to 2004 and its development by using the method of multifactor composite evaluation and an analytical model of the de-gree of coordination. The results indicate that land use efficiency with respect to society and the economy improved,whereas the ecological and environmental efficiencies were found to decrease. The degree of coordination in Zhanjiang is still at the status of basic coordination. Finally,measures for enhancing the ecological and environmental establish-ment are suggested in order to improve the regulations of land use structure and patterns,establish ecological forests for the public good and green corridors and prevent the soil erosion.

关键词： regional scale land-use efficiency degree of coordination evaluation

THE CHANGES OF LAND USE AND THE TEMPORAL & SPATIAL CHARACTERISTICS OF SALT-AFFECTED LANDS ON THE regional scale

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THE CHANGES OF LAND USE AND THE TEMPORAL & SPATIAL CHARACTER...

Factors affecting land dissection density in geomorphological regions of China

第四届智能化农业信息技术国际学术会议

作者： Yujian Yang~(1,2) Jingsong Yang~2 Xueqin Tong~1 Jianhua Zhu~1 1 S&T Information Engineering Research Center of Shandong Academy of Agricultural Science,Jinan 250100,China 2 China Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008,China

Yucheng city in Shandong Province was taken as the typical Fluvo-Aquic soil area in this paper. With the utilization of three different stages remote sensing images and groundwater depth spatial map, soil type spatial map,groundwater salinity spatial map of covering the study area,the support of multi- temporal analysis method,the dynamic change of land use is studied in typical Fluvo-Aquic soil area, the temporal and spatial evolution of salt-affected lands is *** study results show that the areas of land use types of 3 different temporal stages are different in the study area,the area of salt- affected lands is 5 340 hm in 1987,3 670 hm in 1994 and 2 000 hm in *** the spatial distribution,spatial location of most of salt-affected lands in 1994 follows the distribution of salt-affected lands in 1987,but the few of new saline soil spots come into being *** the area of salt-affected lands decreased from 1987 to *** the distribution of salt-affected lands in 2002 with in 1994,the results are similar to the regime from 1987 to 1994,which explains the difficulties of improvement of salt-affected lands.

关键词： regional scale Land use change Spatial and temporal change Salt-affected lands

来源： cnki会议评论

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Journal of Mountain Science 2024年第4期21卷 1372-1387页

作者： SUN Xiaolin ZHAO Yinjun PENG Peihao CHENG Weiming WEI Yongping YANG Ronghao LI Jiaxu College of Earth Sciences Chengdu University of TechnologyChengdu 610059China School of Civil Engineering Guangxi Polytechnic of ConstructionNanning 530001China Key Laboratory of Environment Change and Resources Use in Beibu Gulf Ministry of EducationNanning Normal UniversityNanning 530001China Key Laboratory of Earth Surface Process and Intelligent Simulation(Guangxi) Nanning Normal UniversityNanning 530001China State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China School of Earth and Environmental Sciences The University of QueenslandBrisbane 4702Australia School of Geography and Planning Nanning Normal UniversityNanning 530001China

Land dissection density(LDD)provides morphological evidence regarding prior intense soil erosion and quantifies the distribution of land dissections.A comprehensive understanding of the potential factors influencing the spatial pattern and value of the LDD is vital in geological disasters,soil erosion,and other related *** dissection phenomena in China affects large areas with different morphological,pedological,and climatic *** studies have focused on the potential factors influencing the LDD at a watershed ***,these results are insufficient to reflect the status quo of dissection development and its primary influencing factors on a national ***’s spatial patterns and the dominant factors at a regional scale in millions of square kilometers remain to be *** study used the geomorphon-based method and the geographical detector model to quantify the spatial pattern of LDD over China and identify the dominant factors affecting this pattern in China’s six first-order geomorphological regions(GR1~GR6).The results yield the following findings:(1)LDD in China ranges from 0~4.55 km/km^(2),which is larger in central and eastern regions than in other regions of China;(2)dominant factors and their dominant risk subcategories vary with each geomorphological region’s primary internal and external forces;(3)the influence of natural factors is more significant on the large regional scale in millions of square kilometers compared to anthropogenic factors;relief degree of land surface(RDLS)is dominant in GR1,GR2,and GR5;the slope is dominant in GR6,soil type is dominant in GR3 and GR4,and lithology plays a critical role in the dominant interactions of GR3,GR4,and GR6;(4)the interactions between factors on LDD’s spatial pattern have a more significant effect than individual factors.

关键词： Land dissection density Influencing factors regional scale Spatial pattern Geographical detector model Geomorphon-based method China

Local and regional richness and rarity of leaf-litter ants:An overview from spacial scale in neotropical region

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Open Journal of Animal Sciences 2013年第2期3卷 10-15页

作者： Manoel Fernando Demétrio Rogério Silvestre Programa de Pós Graduacao em Entomologia e Conservacao da Biodiversidade Universidade Federal da Grande DouradosDouradosMato Grosso do SulBrazil Laboratorio de Ecologia de Hymenoptera HECOLAB Faculdade de Ciencias Biologicas e Ambientais-UFGDCidade UniversitariaDouradosMato Grosso do SulBrazil

An unusual approach about richness and rarity of leaf-litter ant species is presented here from a dry forest reminiscent in Pantanal province (Chacoan subregion) suggesting the boundaries that defining local and regional scales for this particular ant community. We analysed the frequency of distribution of 170 ant species collected on 262 Winkler’s samples along Serra da Bodoquena National Park, Mato Grosso do Sul state, Brazil and described some ecological mechanisms that made the species richness estimates be highly influenced by species with low frequencies of records in an extent regional of a pristine dry forest. Bayesian inference was conducted to provide if the probability of latitudinal gradient was correlated with the species richness to define alpha diversity.

关键词： Alpha Diversity Formicidae Rarity Patterns regional scale