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Improved modeling and analysis of the patch size–frequency distribution of forest disturbances in China based on a Landsat forest cover change product

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International Journal of Digital Earth 2021年第2期14卷 181-201页

作者： Dan-Xia Song Chengquan Huang Tao He Joseph O.Sexton Ainong Li Sike Li Hao Wu John R.Townshend College of Urban and Environmental Sciences Central China Normal UniversityWuhanPeople’s Republic of China Hubei Provincial Key Laboratory for Geographical Process Analysis and Simulation Central China Normal UniversityWuhanPeople’s Republic of China Department of Geographical Sciences University of MarylandCollege ParkMDUSA School of Remote Sensing and Information Engineering Wuhan UniversityWuhanPeople’s Republic of China terraPulse IncGaithersburgMDUSA Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengduPeople’s Republic of China School of Earth Atmosphere and EnvironmentMonash University–Clayton CampusVictoriaAustralia

Forest disturbances have been altering the ecological properties of ecosystems;meanwhile,disturbance events of varying sizes create different structures and functions for a forest ***,size and frequency are important attributes of disturbances,and their relationship should be *** present a hierarchical method through the modeling of the overall trend of the size–frequency distribution and the characterization of the non-constant variances of disturbance sizes at each frequency *** method was demonstrated to accurately model the sizes as well as the corresponding frequencies;thus,the total disturbed area and number of disturbance patches were both accurately *** applying the method to 13 provinces in China,consistent patterns were revealed by the modeling results and remote-sensing-based product,showing that between 2000 and 2005,forests in most provinces were dominated by moderate disturbances(10 hasizesizesize>1000 ha)occurred in the northeastern and northwestern *** study concludes that the proposed method can improve the representation of the size–frequency distribution of forest disturbances.

关键词： Forest disturbance patch size remote sensing forestry

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Neighbour effects on plant biomass and its allocation for forbs growing in heterogeneous soils

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Journal of Plant Ecology 2024年第4期17卷 90-99页

作者： Yongjie Liu Chunyan Ma Shiting Liu Mingrui Liu Hui Li Mingxia Wang Guoe Li Hans J.De Boeck Fujiang Hou Zhanhui Tang Zhenxin Li State Key Laboratory of Herbage Improvement and Grassland Agro-ecosystems Key Laboratory of Grassland Livestock Industry InnovationMinistry of Agriculture and Rural AffairsCollege of Pastoral Agriculture Science and TechnologyLanzhou UniversityLanzhou 730020China School of Ecology and Environmental Sciences Yunnan UniversityKunming 650091China Plant and Ecosystems(PLECO) Department of BiologyUniversity of AntwerpWilrijk B-2610Belgium State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration School of EnvironmentNortheast Normal UniversityChangchun 130117China Key Laboratory of Biodiversity and Environment on the Qinghai-Tibet Plateau Ministry of EducationLhasa 850011China

Focal plants are considerably affected by their neighbouring plants,especially when growing in heterogeneous soils.A previous study on grasses demonstrated that soil heterogeneity and species composition affected plant biomass and above-and belowground allocation *** now tested whether these findings were similar for *** forb species(*** anglica,Limonium bicolor and Suaeda glauca)were grown in pots with three levels of soil heterogeneity,created by alternatively filling resource-rich and resource-poor substrates using small,medium or large patch *** compositions were created by growing these forbs either in monocultures or in *** showed that patch size×species composition significantly impacted shoot biomass,root biomass and total biomass of forbs at different ***,at the pot scale,shoot biomass,root biomass and total biomass increased with increasing patch *** the substrate scale,shoot biomass and total biomass were higher at the large patch size than at the medium patch size,both in resource-rich and resource-poor ***,at the community scale,monocultures had more shoot biomass,root biomass and total biomass than those in the two-or three-species *** results differ from earlier findings on the responses of grasses,where shoot biomass and total biomass decreased with patch size,and more shoot biomass and total biomass were found in resource-rich than resource-poor *** further elucidate the effects of soil heterogeneity on the interactions between neighbour plants,we advise to conduct longer-term experiments featuring a variety of functional groups.

关键词： biomass allocation neighbour effect patch size soil heterogeneity shoot biomass

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Soil heterogeneity affects ramet placement of Hydrocotyle vulgaris

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Journal of Plant Ecology 2015年第1期8卷 91-100页

作者： Bi-Cheng Dong Jiu-Zhong Wang Rui-Hua Liu Ming-Xiang Zhang Fang-Li Luo Fei-Hai Yu School of Nature Conservation Beijing Forestry UniversityQinghua East Road 35Haidian DistrictBeijing 100083China School of Forestry Beijing Forestry UniversityQinghua East Road 35Haidian DistrictBeijing 100083China Research Center for Eco-Environmental Sciences Chinese Academy of SciencesShuangqing Road 18Haidian DistrictBeijing 100085China

Aims Soil heterogeneity is common in natural *** may trigger for-aging responses(placing more ramets and/or roots in nutrient-rich patches than in nutrient-poor patches)and further affect the growth of ***,the impact of soil heterogeneity on competitive interactions has been little *** We conducted a greenhouse experiment to investigate the effects of soil heterogeneity on intraspecific competition with a stolonif-erous herb Hydrocotyle *** grew one(without com-petition)or nine ramets(with competition)of *** under a homogeneous environment and two heterogeneous environ-ments differing in patch size(large or small patches).In the het-erogeneous treatment,the soil consisted of the same number of nutrient-rich and nutrient-poor patches arranged in a chessboard manner,and in the homogeneous treatment,the soil was an even mixture of the same amount of the nutrient-rich and the nutrient-poor *** Findings Irrespective of intraspecific competition,*** showed for-aging responses to soil heterogeneity in the large patch treatment,*** produced significantly more biomass,ramets,aboveground mass and root mass in the nutrient-rich patches than in the nutrient-poor *** the small patch treatment,foraging responses were observed when intraspecific competition was present,but responses were not observed when there was no ***,we find a significant effect of soil heterogeneity on neither overall growth nor competitive intensity of *** results suggest that foraging responses to soil heterogeneity may not necessarily be adaptive and intraspecific competition may not be influenced by soil heterogeneity.

关键词： clonal plant competition environmental heterogeneity foraging response patch size physiological integration

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Spatial heterogeneity in soil particle size:does it affect the yield of plant communities with different species richness?

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Journal of Plant Ecology 2016年第5期9卷 608-615页

作者： Wei Xue Lin Huang Fei-Hai Yu School of Nature Conservation Beijing Forestry UniversityBeijing 100083China

Aims Soil heterogeneity is ubiquitous in many *** hypothesized that plant communities with higher species richness might be better adapted to soil heterogeneity and produce more biomass than those with lower *** is because there is niche differentiation among species and different species can complement each other and occupy a broader range of niches when plant species richness is ***,no study has tested how soil particle heterogeneity affects the yield of plant communities,and whether such effects depend on the spatial scale of the heterogeneity and the species richness within the *** In a greenhouse experiment,we sowed seeds of four-species or eight-species mixtures in three heterogeneous treatments consisting of 32,8 or 2 patches of both small(1.5 mm)and large quartz(3.0 mm)particles arranged in a chessboard manner and one homogeneous treatment with an even mixture of small and large quartz *** Findings Biomass production was significantly greater in the communities with high species richness than those with low species ***,soil particle heterogeneity or its interactions with patch scale or species richness did not significantly affect biomass production of the experimental *** work indicates that plant species richness may have a bigger impact on plant productivity than soil particle *** studies should consider multiple sets of plant species during longer time periods to unravel the potential mechanisms of soil heterogeneity and its interactions with the impacts of species richness on community yield and species coexistence.

关键词： diversity effect experimental communities environmental heterogeneity patch size soil particle heterogeneity spatial scale

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patch occupancy by the Chinese Grouse(Tetrastes sewerzowi)in a fragmented landscape

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Chinese Birds 2013年第3期4卷 232-239页

作者： Siegfried KLAUS Winfried VOIGT 方昀 Peter SELSAM 孙悦华德国马普生物地球化学研究所德国耶拿大学生态学研究所中国科学院动物研究所动物生态与保护生物学重点实验室北京100101 德国耶拿大学地理学研究所

The Chinese Grouse (Tetrastes sewerzowi) is a rare, endemic bird in China, inhabiting conifer-dominated mountain forests. Both the natural fragmentation and heavy cutting of mature forests have resulted in patchy grouse habitats. We used SPOT (XS-sensor) satellite imagery to discriminate between open land and conifer or broadleaf forests. The area analyzed is about 120000 ha in size and includes the Lianhuashan Nature Reserve and the Yeliguan Forestry Park. We identiifed 4111 ha of mature coniferous forests in 229 patches (maximum 332 ha, mean 18 ha) as the habitat used by Chinese Grouse throughout the year. We examined 31 forest islands of different sizes and degrees of isolation for the presence of Chinese Grouse. We used generalized linear models (GLM) with binomial error structure and logit link function to estimate the probability of Chinese Grouse occupancy in a forest fragment. Habitat patch size (hs) and distance to the next occupied fragment (doc) were used as predictor variables, important for occupancy. Small habitat islands were disproportionately less likely to be occupied than large, nearby habitats. There was a clear speciifc habitat size of about 40 ha, above which habitat fragments were occupied more often. Suitable habitat fragments isolated by more than 2 km appeared to be inaccessible to Chinese Grouse. The results have been used in reforestation projects to establish linking corridors in the study area.

关键词： Tetrastes sewerzowi habitat fragmentation patch size isolation Lianhuashan reserve China

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