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Current re-vegetation patterns and restoration issues in degraded geological phosphorus-rich mountain areas:A synthetic analysis of Central Yunnan, SW China

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Plant Diversity 2017年第3期39卷 140-148页

作者： Kai Yan Sailesh Ranjitkar Deli Zhai Yunju Li Jianchu Xu Bo Li Yang Lu Key Laboratory for Plant Diversity and Biogeography of East Asia Kunming Institute of BotanyChinese Academy of Sciences World Agroforestry Center ICRAF East and Central Asia The State Phosphorus Resource Development and Utilization Engineering Technology Research Centre Yunnan Phosphate Chemical Group Co. Ltd College of Resource and Environment Yunnan Agricultural University

China has the largest area of inland geological phosphorus-rich(GPR) mountains in the world, where vegetation restoration is key to safeguarding the environment. We reviewed the published literature and collected new data in order to analyze re-vegetation patterns and the status of plant communities in central Yunnan. The aim of our analysis was to suggest future improvements to restoration strategies in GPR mountain regions. Our results showed that spontaneous recovery was the most widespread type of restoration. N-fixing species such as Coriaria nepalensis and Alnus nepalensis play a vital role in succession. In the past, monoculture tree plantation was the primary method used in afforestation activities in central Yunnan; in recent years however, several different methods of restoration have been introduced including the use of agroforestry systems. For practical restoration, we found that spontaneous recovery was capable of delivering the best results, but that during its early stages, restoration results were affected by several factors including erosion risk, the origin of propagates and environmental variation. In contrast, methods employing human-made communities performed better in their early stages, but were constrained by higher costs and vulnerability to degradation and erosion. The use of N-fixing species such as A. nepalensis and Acacia mearnsii in plantations were unsuccessful in restoring full ecosystem functions. The success of restoration activities in GPR mountain regions could be improved through the following measures:(1) developing a better understanding of the respective advantages and disadvantages of current natural and human-engineered restoration approaches;(2) elucidating the feedback mechanism between phosphorus-rich soil and species selected for restoration, especially N-fixing species;(3) introducing market incentives aimed at encouraging specific restoration activities such as agroforestry, and improving the industry value chain.

关键词： Systematic review Dianchi Lake Fuxian Lake Natural restoration Human engineered restoration floristic similarity

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Using resistance distance from circuit theory to model dispersal through habitat corridors

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Journal of Plant Ecology 2018年第3期11卷 385-393页

作者： Jan Thiele Sascha Buchholz Jens Schirmel Institute of Landscape Ecology University of MünsterHeisenbergstr.2Münster 48149Germany Department of Ecology TU BerlinRothenburgstr.12Berlin 12165Germany Berlin-Brandenburg Institute of Advanced Biodiversity Research(BBIB) Altensteinstr.34Berlin 14195Germany Institute of Environmental Sciences University Koblenz-LandauFortstr.7Landau 76829Germany

Aims Resistance distance(RD),based on circuit theory,is a promising metric for modelling effects of landscape configuration on dispersal of organ-isms and the resulting population and community *** values of RD reflect the likelihood of a random walker to reach from a source to a certain destination in the *** it has successfully been used to model genetic structures of animal populations,where it most often outperforms other isolation metrics,there are hardly any applications to plants and,in particular,to plant community *** aims were to test if RD was a suitable metric for studying dispersal processes of plants in narrow habitat corridors(linear landscape ele-ments[LLE]).This would be the case,if dispersal processes(seed dis-persal and migration)resembled random ***,we compared the model performance of RD against least-cost distance(LCD)and Euclidean distance(ED).Finally,we tested the suitability of different cost surfaces for calculations of LCD and *** We used data from 50 vegetation plots located on semi-natural LLE(field margins,ditches,road verges)in eight agricultural landscapes of Northwest *** mapped LLE,including hedges and tree rows,from aerial images in a Geographic Information System,con-verted the maps into raster layers,and assigned resistance values to the raster cells,where all cells outside of LLE received infinite resist-ance and,thus,represented barriers to *** all pairs of plots within study areas,we calculated Jaccard similarity assuming that it was a proxy(or correlate)of dispersal events between ***,we calculated RD and LCD of the network of LLE and ED between the *** modelled the effects of distance metrics on community similarity using binomial generalized linear mixed *** Findings ED was clearly the least suitable isolation ***,we found that RD performed better than LCD at modelling Jaccard *** varied markedly betwee

关键词： connectivity floristic similarity isolation landscape migration least-cost distance

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Tree succession across a seasonally dry tropical forest and forest-savanna ecotone in northern Minas Gerais,Brazil

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Journal of Plant Ecology 2017年第5期10卷 859-868页

作者： Polyanne A.Coelho Paola Ferreira Santos Eduardo de Paiva Paula Deborah M.G.Apgaua Bruno Gini Madeira Gisele Cristina de Oliveira Menino Yule Roberta Ferreira Nunes Rubens M.Santos David Y.P.Tng Department of Forest Sciences Federal University of LavrasC.P.3037CEP 37200-000LavrasMinas GeraisBrazil Department of General Biology State University of Montes ClarosC.P.126CEP 39401-089Montes ClarosMinas GeraisBrazil Instituto Federal Goiano C.P.66CEP 75901-970Rio VerdeGoiâniaBrazil Centre for Tropical Environmental and Sustainability Sciences College of Marine and Environmental SciencesJames Cook University14-88 McGregor RdSmithfield QLD 4878CairnsQueenslandAustralia

Aims Understanding succession in tropical forest is an important aspect of vegetation science,but to date,successional processes in sea-sonally dry tropical forests(SDtFs)have received much less atten-tion than evergreen humid tropical *** aim to fill this knowledge *** We investigated vegetation succession in SDtF areas consisting of three different successional stages(early,intermediate,late),and a SDtF-savanna ecotone in the municipal district of Juramento,north of Minas Gerais State,*** twelve 400 m2 plots in each area,we compared vegetation parameters and structural variables(absolute density and basal area)and examined the floristic composition of the tree component to find gradients of *** Findings We found evidence of species turnover along a successional gradi-ent,with the intermediate stage showing the highest species rich-ness and *** was accompanied with a significant increase in the number of tree individuals and basal area from the early to intermediate successional ***,the intermediate and late SDtF successional stages were more similar in structure and *** ecotone was the most species rich and was similar to the intermediate SDtF and early successional stage in species richness and floristic composition *** results will have implications for guiding SDtF management and recovery programs.

关键词： caatinga floristic similarity ecotone forest succession resilience.

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Soil Seed Banks in Two Environments of Forest Restoration Post Bauxite Mining:Native Tree Plantation and Natural Regeneration

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Research in Ecology 2021年第1期3卷 1-13页

作者： Sebastião Venâncio Martins Wesley da Silva Fonseca Luiz Henrique Elias Cosimo Diego Balestrin Forest Restoration Laboratory Department of Forest EngineeringUniversidade Federal de ViçosaViçosaMinas GeraisBrazil

The objective of this study was to compare the soil seed bank in an area under natural regeneration(F1)and another reforested through seedling planting(F2),seven years after bauxite mining,in Southeast,*** each area,10 sampling points were randomly distributed,using three samples of topsoil to represent each *** samples were transported to a shade house and evaluated for six months,where emerging individuals were identified every two *** similarity was evaluated with cluster analysis based on the Jaccard index(SJ).Species richness and abundance of individuals were compared using Student's t *** F1,2,114.94 propagules m-2 were registered,belonging to 51 species and 24 botanical families,Shannon-Wiener diversity index H’=2.770 and Pielou evenness index J’=*** F2,1,168.62 propagules m-2 were registered,belonging to 42 species and 22 families,H’=2.618 and J’=***(SJ)between F1 and F2 was 0.61,indicating a high *** results showed high density of propagules,good diversity and absence of ecological *** high number of individuals and diversity of tree species with zoochoric dispersion found in the areas indicates that both natural regeneration and reforestation were efficient in the ecological restoration of bauxite mined areas.

关键词： Ecological restoration Bioindicators floristic similarity Diversityl Forest ecology

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