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Characterizing changes in land cover and forest fragmentation from multitemporal Landsat observations(1993-2018)in the Dhorpatan Hunting Reserve,Nepal

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Journal of forestry Research 2022年第1期33卷 159-170页

作者： Yali Zhang Sandeep Sharma Manjit Bista Mingshi Li College of forestry Nanjing Forestry UniversityLongpan Road 159Nanjing 210037People’s Republic of China Department of National Parks and Wildlife Conservation Madanbhandari PathKathmandu 44600Nepal Co-Innovation Center for Sustainable forestry in Southern China Nanjing Forestry UniversityLongpan Road 159Nanjing 210037People’s Republic of China

Natural forces and anthropogenic activities greatly alter land cover,deteriorate or alleviate forest fragmentation and affect *** land cover and forest fragmentation dynamics have become a focus of concern for natural resource management agencies and biodiversity conservation ***,there are few land cover datasets and forest fragmentation information available for the Dhorpatan Hunting Reserve(DHR)of Nepal to develop targeted biodiversity conservation *** this study,these gaps were filled by characterizing land cover and forest fragmentation trends in the *** five Landsat images between 1993 and 2018,a support vector machine algorithm was applied to classify six land cover classes:forest,grasslands,barren lands,agricultural and built-up areas,water bodies,and snow and ***,two landscape process models and four landscape metrics were used to depict the forest fragmentation *** showed that forest cover increased from 39.4%in 1993 to 39.8%in ***,grasslands decreased from 38.2%in 1993 to 36.9%in *** forest shrinkage was responsible for forest loss during the period,suggesting that the loss of forest cover reduced the connectivity between forest and nonforested *** was the dominant component of the forest restoration process,implying that it avoided the occurrence of isolated *** maximum value of edge density and perimeter area fractal dimension metrics and the minimum value of aggregation index were observed in 2011,revealing that forests in this year were most *** specific observations from the current analysis can help local authorities and local communities,who are highly dependent on forest resources,to better develop local forest management and biodiversity conservation plans.

关键词： Land cover forest fragmentation Spatial process model Fragstats

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Deforestation and forest fragmentation in the highlands of Eastern Ghats,India

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Journal of forestry Research 2021年第3期32卷 1127-1138页

作者： Rakesh Paul Kakoli Banerjee Central University of Orissa KoraputOdishaIndia

Tropical forest cover change along with increasing fragmentation has detrimental effects on the global *** the current study change in both forest cover and fragmentation of Koraput district have been assessed in the past three decades(1987-2017)and future decade(2017-2027),which has been modelled using logistic regression showing a gradual decrease in the forest cover and increase in *** long term deforestation rates from 1987 to 2017(current period)and from 1987 to 2027(predicted period)were found to be-0.018 and-0.012,*** of the total geographical area,2027 number of grids(1 km^(2))out of 8856 grids were found to have shown extinction of forest in the study *** conversion of forested lands into other land uses has been one of the major causes of deforestation in Koraput,especially because of the increasing mining activities and establishment of three major industries namely National Aluminium Company(NALCO),Damanjodi,Hindustan Aeronautics Limited(HAL),Sunabeda and Ballarpur Industries Limited(BILT).The forest fragmentation reveals a negative trend,recording highest conversion from large core fragments to edge(191.33 km2)and the predicted period has also shown the same trend of negative change,which poses serious danger to the structure of the *** of all the landscape matrices calculated,number of patches will increase to 214 in 2027 from 93 in *** the test between geographically weighted regression(GWR)and ordinary least square regression(OLS),GWR was the better fit model for drawing a spatial relationship between forest cover and fragmentation *** study confirmed that the forest cover change has impacted the forest fragmentation in the study *** programmes like REDD+should be implemented along with the experiences of Community forest Management and the joint forest management should be intensified at community level in order to develop better management practices to conserve habitats in biodi

关键词： forest cover forest ecosystem Predictive model forest fragmentation Grid based change Geographically weighted regression

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A township-level assessment of forest fragmentation using morphological spatial pattern analysis in Qujing,Yunnan Province,China

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Journal of Mountain Science 2021年第12期18卷 3125-3137页

作者： HUANG Xiao-yuan YE Yuan-hui ZHANG Zhuo-ya YE Jiang-xia GAO Jie Marc BOGONOVICH ZHANG Xing School of Geography and Ecotourism(SGE) Southwest Forestry University(SWFU)Kunming 650224China Peking university No.5 Yiheyuan Road Haidian DistrictBeijing 100871China China Agricultural University No.17 Qinghua Road EastHaidian DistrictBeijing 100083China Hebei university of environmental Engineering No.8 Jingang DistrictQinhuangdao 066102China

forest fragmentation is an integral part of global *** forest fragmentation patterns and dynamics are of great significance for maintaining ecosystem *** are great differences in the interference of natural and human factors on forests in different towns of mountainous cities,and the characteristics of forest fragmentation are also obviously *** fragmentation has been broadly studied,yet,it remains poorly understood at the township-scale within mountainous *** this study,the spatial form of forest landscape and forest fragmentation modes of towns were examined in Qujing City,Yunnan Province,China for the years of 2006 and 2016,relying heavily on the morphological spatial pattern analysis(MSPA)and K-means clustering *** in 2016 showed that the forest landscape morphology of Qujing could be divided into seven classes:core,perforation,islet,bridge,edge,branch and ring;with landscape areas of 41.94%,1.22%,7.04%,11.12%,23.26%,11.74%and 3.68%*** with 2006,the changes of landscape area were 1.71%,0.02%,0.30%,1.65%,0.20%,0.19%and 0.05%*** townships in Qujing varied significantly in their landscape fragmentation patterns,and these patterns were spatially *** forest landscape forms have positive spatial correlations and *** forest fragmentation modes of towns can be divided into four types:Low anthropogenic towns,high anthropogenic towns,complex terrain towns and gentle terrain *** ways of human activities play a decisive role in forest landscape *** expansion of construction land and agricultural land intensifies forest fragmentation;however,man-made orderly and planned ecological restoration will greatly improve the forest coverage and improve the spatial form of urban forest landscape.

关键词： forest fragmentation Morphological spatial pattern analysis Morphological type China

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Effects of forest fragmentation on nocturnal Asian birds:A case study from Xishuangbanna,China

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Zoological Research 2016年第3期37卷 151-158页

作者： Salindra K.DAYANANDA Eben GOODALE Myung-bok LEE Jia-Jia LIU Christos MAMMIDES Bonifacio O.PASION Rui-Chang QUAN J.W.Ferry SLIK Rachakonda SREEKAR Kyle W.TOMLINSON Mika YASUDA Center for Integrative Conservation Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMenglunYunnan 666303China College of forestry Guangxi UniversityNanningGuangxi 530005China Foundation for Nature Conservation and Preservation Panadura 12500Sri Lanka University of the Chinese Academy of Sciences Beijing 100049China Key Laboratory of Conservation Biology for Endangered Wildlife of the Ministry of Education College of Life SciencesZhejiang UniversityHangzhouZhejiang 310027China Key Laboratory of Tropical forest Ecology Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMenglunYunnan 666303China Faculty of Science Universiti Brunei DarussalamJIn.Tungku LinkGadong BE141OBrunei Darussalam School of Biological Sciences University of AdelaideAdelaideSouth Australia 5000Australia forestry and forest Products Research Institute TsukubaIbaraki 305-8687Japan

Owls have the potential to be keystone species for conservation in fragmented landscapes, as the absence of these predators could profoundly change community structure. Yet few studies have examined how whole communities of owls respond to fragmentation, especially in the tropics. When evaluating the effect of factors related to fragmentation, such as fragment area and distance to the edge, on these birds, it is also important in heterogeneous landscapes to ask how ＇location factors＇ such as the topography, vegetation and soil of the fragment predict their persistence. In Xishuangbanna, southwest China, we established 43 transects （200 mx60 m） within 20 forest fragments to sample nocturnal birds, both visually and aurally. We used a multimodel inference approach to identify the factors that influence owl species richness, and generalized linear mixed models to predict the occurrence probabilities of each species. We found that fragmentation factors dominated location factors, with larger fragments having more species, and four of eight species were significantly more likely to occur in large fragments. Given the potential importance of these birds on regulating small mammal and other animal populations, and thus indirectly affecting seed dispersal, we suggest further protection of large f ragments and programs to increase their connectivity to the remaining smaller fragments.

关键词： forest fragmentation Landscape ecology Nocturnal birds Owls Trophic cascades

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National assessment of the evolution of forest fragmentation in Mexico

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Journal of forestry Research 2011年第2期22卷 167-174页

作者： Rafael Moreno-Sanchez Francisco Moreno-Sanchez Juan Manuel Torres-Rojo University of Colorado Denver Department of Geography and Environmental SciencesCampus Box 172 P.O.Box 173364DenverCO 80217-3364USA Instituto Nacional de Investigaciones forestales y Agropecuarias(INIFAP) Av Progreso #5CoyoacánMéxico D.F.04100México Centro de Investigación y Docencia Económicas(CIDE) Carretera México-Toluca 3655Col.Lomas de Santa FeMéxicoD.F.01210México

This paper presents assessments of the fragmentation of the temperate and tropical forests in Mexico at the national level for two dates 1993 and *** study was based on land use and vegetation cover data sets scale 1：250,*** broad forest types（Temperate forests and Tropical forests） and five more specific forest types（Broadleaf forests,and Coniferous forests;Tropical Dry Deciduous forests,Tropical Sub-evergreen forests,and Tropical Evergreen forests） were defined to conduct the *** 3.3 was used to estimate nine metrics of the spatial pattern of the forests for each forest type and date *** results indicate that the land cover transitions that have occurred between 1993 and 2002 have resulted in more isolated forest patches with simpler shapes in both the Temperate and Tropical *** remaining Tropical forest patches have become smaller and more *** contrast,the remaining Temperate forest patches are fewer and on average *** the more specific forest types defined in this study,the Broadleaf forests have the highest indicators of *** these forests are usually embedded or adjacent to Coniferous *** more concern for conservation purposes are the high values of fragmentation metrics found for the Tropical Evergreen forests and Tropical Dry Deciduous forests,because these forest types are usually surrounded by non-forest land covers or anthropogenic land uses.

关键词： forest fragmentation Mexico FragStats.

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Effects of fragmentation on the seed predation and dispersal by rodents differ among species with different seed size

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Integrative Zoology 2017年第6期12卷 468-476页

作者： Qiong CHEN Kyle W.TOMLINSON Lin CAO Bo WANG Center for Integrative Conservation Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMenglaYunnanChina University of Chinese Academy of Sciences BeijingChina

fragmentation influences the population dynamics and community composition of vertebrate ***mentation effects on rodent species in forests may,in turn,affect seed predation and dispersal of many plant *** studies have usually addressed this question by monitoring a single species,and their results are *** few studies have discussed the fragmentation effect on rodent-seed interaction among tree species with different seed sizes,which can significantly influence rodent foraging preference and seed *** that fruiting periods for many coexisting plant species overlap,the changing foraging preference of rodents may substantially alter plant *** this study,we monitored the dispersal and predation by rodents of 9600 seeds,belonging to 4 Fagaceae species with great variation in seed size,in both the edge and interior areas of 12 tropical forest fragments ranging in area from 6.3 to 13872.9 ha in Southwest *** results showed that forest fragmentation altered the seed fates of all the species,but the intensity and even the direction of fragmentation effect differed between species with large versus small *** the seeds harvested,fragment size showed negative effects in forest interiors but positive effects at edges for the 2 large-seeded species,but showed little effect for the 2 small-seeded *** the seeds removed,negative effects of fragment size only existed among the small-seeded *** different fragmentation effect on seed dispersal and predation among plant species may,in turn,translate into the composition differences of the regeneration of the whole fragmented forest.

关键词： edge effect forest fragmentation plant-rodent interaction seed size

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National assessment of the fragmentation,accessibility and anthropogenic pressure on the forests in Mexico

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Journal of forestry Research 2012年第4期23卷 529-541页

作者： Rafael Moreno-Sanchez Juan Manuel Torres-Rojo Francisco Moreno-Sanchez Sue Hawkins Justin Little Susan McPartland University of Colorado Denver Department of Geography and Environmental SciencesCampus Box 172 P.O.Box 173364DenverCO 80217-3364USA. Centro de Investigación y Docencia Económicas(CIDE) Carretera México-Toluca 3655Col.Lomas de Santa FeMéxicoD.F.01210México. Instituto Nacional de Investigaciones forestales y Agropecuarias(INIFAP) Av Progreso #5CoyoacánMéxico D.F.04100México Department of Geography and Environmental Sciences University of Colorado DenverCampus Box 172 P.O.Box 173364 DenverCO 80217-3364USA

forest managers and policy makers increasingly demand to have access to estimates of forest fragmentation, human accessibility to forest areas and levels of anthropogenic pressure on the remaining forests to integrate them into monitoring systems, management and conservation plans. forest fragmentation is defined as the breaking up of a forest unit, where the number of patches and the amount of expose edge increase while the amount of core area decreases. forest fragmentation studies in Mexico have been limited to local or regional levels and have concen- trated only on specific forest types. This paper presents an assessment of the fragmentation of all forest types at the national level, their effective proximity to anthropogenic influences, and the development of an indica- tor of anthropogenic pressure on the forests areas. Broadleaf forests, tropical evergreen forests and tropical dry deciduous forests show the greatest fragmentation. Almost half （47%） of the tropical forests are in close effective proximity to anthropogenic influences and only 12% of their area can be considered isolated from anthropogenic influences. The values for the temperate forests are 23% and 29% respectively. Anthro- pogenic pressure in the immediate vicinity of anthropogenic activities is much higher in the tropical forests （75 in a scale 0-100） than in the tem- perate forests （30）. When considering these results jointly, the tropical forests, and more specifically, the tropical evergreen forests and tropical dry deciduous forests are under the greatest pressure and risks of degra- dation.

关键词： forest fragmentation effective proximity anthropogenicpressure Mexico forests GIS.

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Extensive pollen immigration and no evidence of disrupted mating patterns or reproduction in a highly fragmented holm oak stand

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Journal of Plant Ecology 2014年第4期7卷 384-395页

作者： Joaquín Ortego Raúl Bonal Alberto Muñoz JoséMiguel Aparicio Grupo de Investigación de la Biodiversidad Genética y Cultural Instituto de Investigación en Recursos Cinegéticos-IREC(CSICUCLMJCCM)Ronda de Toledo s/nE-13005 Ciudad RealSpain Departamento de Ecología Evolutiva Museo Nacional de Ciencias Naturales(CSIC)C/JoséGutiérrez Abascal 2E-28006 MadridSpain Departamento de Didáctica de las Ciencias Experimentales Facultad de EducaciónUniversidad Complutense de MadridC/Rector Royo Villanova s/nE-28040 MadridSpain Centre de Recerca Ecològica i Aplicacions forestals(CREAF) Cerdanyola del VallèsE-08193 BarcelonaSpain

Aims forest fragmentation and reduced tree population densities can poten-tially have negative impacts on mating patterns,offspring genetic diversity and reproductive *** aim of the present study is to test these hypotheses comparing an extremely fragmented,low tree density(~0.02 trees/ha)holm oak(Quercus ilex l.)stand from Central spain with a nearby high tree density stand(~50 trees/ha).Methods We genotyped adult trees and seeds from the low-density stand(436 seeds from 15 families)and the high-density stand(404 seeds from 11 families)using nine microsatellite *** these data,we performed paternity analyses,determined pollen flow,mating patterns and pollen pool structure,and estimated progeny genetic diversity in both *** also studied seed set and production and performed a pollen supplementation experiment to determine whether reduced tree density has limited foreign pollen *** Findings We have found extensive pollen immigration(>75%)into the low tree density stand and monte Carlo simulations revealed that pollen moves larger distances than expected from null models of random *** patterns and differentiation of pollen pools were similar in the high-density stand and the low-density stand but we found higher inter-annual differentiation of pollen pools in the *** genetic diversity and self-fertilization rates did not dif-fer between the low-density stand and the high-density *** set rates were significantly lower in the low-density stand than in the high-density stand and experimental cross-pollen supplementation evidenced that foreign pollen availability is indeed a limiting factor in the ***,seed crops did not differ between the low-density stand and the high-density stand,indicating that limitation of foreign pollen is not likely to be of great concern in terms of reduced seed production and potential *** forest regeneration due to other ecological and human fac

关键词： forest fragmentation genetic diversity paternity analyses pollen dispersal pollen pool structure selfing tree density

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Assessing genetic diversity and structure of fragmented populations of eastern white pine(Pinus strobus)and western white pine(***)for conservation management

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Journal of Plant Ecology 2009年第3期2卷 143-151页

作者： Melanie Mehes Kabwe K.Nkongolo Paul Michael Department of Biology Laurentian UniversitySudburyOntarioCanada P3E 2C6

Aims Many pine populations in Canada have fragmented distributions resulting from the effects of glaciations,overharvesting and white pine blister rust *** fragmentation can modify gene flow and reduce genetic *** logging can reduce the density of trees,thereby altering mating patterns and increasing *** hypothesis of the present study is that forest fragmentation will not increase inbreeding and will have no effect on genetic diversity parameters in the Canadian Pinus moniticola and *** populations targeted because of(i)the long life span of the pine species,(ii)outbreeding and self-incompatibility of *** and *** and(iii)wind pollination resulting in high gene flow among *** studied the genetic diversity of *** across its range in Canada,and we completed a detailed analysis of the genetic structure of *** populations from western Canada using microsatellites genetic *** Seed samples from 10 *** populations and 10 *** populations were collected from western and eastern Canada,*** mother trees included in seed lots were representative of each *** DNA extracted from each sample was amplified with microsatellite *** intra-and interpopulation genetic diversity parameters were assessed using Popgene and Genepop softwares and the genetic distances among populations within each species using the PowerMarker software.

关键词： Pinus strobus Pinus monticola microsatellite genetic diversity forest fragmentation

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Patch isolation and shape predict plant functional diversity in a naturally fragmented forest

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Journal of Plant Ecology 2018年第1期11卷 136-146页

作者： Amaranta Arellano-Rivas J.Arturo De-Nova Miguel A.Munguía-Rosas Instituto de Investigación de Zonas Desérticas Universidad Autónoma de San Luís PotosíSan Luis Potosí78377México Laboratorio de Ecología Terrestre Departamento de Ecología HumanaCentro de Investigación y Estudios Avanzados del Instituto Politécnico Nacional(CINVESTAV)Mérida 97310México Facultad de Agronomía Universidad Autónoma de San Luís PotosíSan Luis Potosí78321México

Aims It is known that taxonomic diversity can be predicted by the spatial configuration of the habitat,in particular by its area and degree of ***,taxonomic diversity is a poor predictor of ecosystem *** functional diversity is strongly linked to the func-tionality and stability of ecosystems,little is known about how changes in the spatial configuration of the habitat affect functional *** this study,we evaluated whether the spatial configuration of forest patches predicts the functional diversity of plants in a fragmented *** Five functional leaf traits(leaf dry matter content,leaf punch force,specific leaf area,leaf size and leaf thickness)were measured for 23 dominant plant species in 20 forest patches in a naturally fragmented forest on the yucatan ***-weighted multivariate and individual trait metrics of functional diversity were calculated and cor-related with size,degree of isolation and the shape of forest *** Findings Patch shape was negatively correlated with multivariate and individ-ual trait(leaf dry matter content and leaf size)metrics of functional *** isolation measures were also negatively correlated with individual trait(leaf dry matter content,leaf punch force and leaf size)metrics of functional *** other words,greater patch shape irregularity and isolation degree impoverish plant func-tional *** is the first report of the negative effects of patch shape irregularity and isolation on the functional diversity of plant communities in a forest that has been fragmented for a long time.

关键词： forest fragmentation functional diversity habitat spatial configuration petenes yucatan

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