Guilin sugar orange has advantages of good taste, harvest during the Spring Festival, marketable market, and it has got swift and violent development in recent years. Sugar orange yield and quality is closely related ...Guilin sugar orange has advantages of good taste, harvest during the Spring Festival, marketable market, and it has got swift and violent development in recent years. Sugar orange yield and quality is closely related to meteorological conditions, so in order to study the effect of meteorological conditions on the Guilin sugar orange, the local conditions of each orange-planting county in Guilin is analyzed, and study is also carried out on the severe weather and its defense measures. The suitable growth temperature for sugar orange is 23-29 ℃, and sugar orange is not tolerant to waterlogging and drought, like light, and has no resistance to ice cold. The main meteorological disasters include high temperature, low temperature, flood, drought, wind, hail, etc. Reasonable selection of orchard, scientific management, especially the management of plant diseases and insect pests, is the key to ensure high-quality high sand sugar orange.展开更多
Land-use change is intertwined with tourism because land is used as a resource for human activities.Land-use change also provides an opportunity to evaluate the status of the ecoenvironment.Understanding the relations...Land-use change is intertwined with tourism because land is used as a resource for human activities.Land-use change also provides an opportunity to evaluate the status of the ecoenvironment.Understanding the relationship between tourism and land use change would help to predict the effect of tourism on land use and encourage sustainable tourism development.Using the Li River Basin as a case study,a hybrid approach using multilevel modeling and logistic regressions was employed to analyze the distribution of land-usechange between 1989 and 2010 to examine potential driving factors.Results reveal that rapid tourism development and construction expansion expose this area to risk of deforestation and forest degradation.Construction increased by 141% between 1989 and 2000 and by 195% between 2000 and 2010.The primary driving force for construction expansion shifted from population growth between 1989 and 2000 to investment growth after 2000.New construction primarily occurred on crop and woodlands areas,with shares of 81.25% and 6.38%,respectively,between 1989 and 2000,and with shares of 57.79% and 15.29%,respectively,between 2000 and 2010.Moreover,these drastic increases in construction also led to frequent transitions between croplands,woodlands,and grasslands.Traits including distances to urban areas and roads and scenic locations exerted significant effects on land-use change.Woodland regrowth in the areas thatsurround scenic locations consisted of fluctuating woodlands,whereas stable woodland regrowth was often absent in these areas.Likewise,permanent woodland clearing tended to be closed to near scenic locations.That is,construction at scenic locations negatively affected forest conservation in the Li River Basin.展开更多
This study investigates the spatial differences and the factors influencing those differences as they affect forest transitions in the Qian-Gui Karst Mountain areas to provide references for policy makers,and ideas fo...This study investigates the spatial differences and the factors influencing those differences as they affect forest transitions in the Qian-Gui Karst Mountain areas to provide references for policy makers,and ideas for ecological environmental protection strategies and adaptive management strategies for forest restoration projects in mountain areas.Forest transition characteristics are determined in relationship to spatial and functional transitions.SPSS and a geographical detector are used to analyze the forces driving forest transitions in terms of natural environmental and socio-economic factors.The results were as follows:(1)The area of forestland in the Qian-Gui Karst Mountain areas increased by 673.5 km^2 during 1990-2015,and a U-shaped curve generally describes the tendency of this change.More precisely,forest land area decreased initially and increased later,with the turning point occurring in the year 2000.This suggests that the Qian-Gui Karst Mountain areas are being maintained at a later stage of forest transition,and this means they are experiencing a net increase in forest land area.The average annual rainfall and temperature,distance to the nearest river and nearest rural residential area,amplitude of topographical relief,and slope contributed the most to forest spatial transitions.(2)During the study period,the tendency for forest coverage to change varied considerably in different parts of the study area,and the greatest increase occurred in the area of very high forest coverage,an area of 154173.71 km^2.The ranking of other forest coverages tended to decrease during the past 25 years.The vegetation ecosystem,in general,is being maintained in the process of restoration,and changes in the ranking of forest coverage were high in the northern part of the study area and low in the southern part.Forest spatial transitions were affected by the interaction between natural environmental and socio-economic factors,and the average annual temperature and rainfall,elevation,and lighting intensity at night were the most important factors that governed forest functional transitions.An examination of the direction in which spatial and functional transitions are moving in the forest area indicates that ecological construction,rather than spatial expansion of the forest area,should be used in the future to improve forest quality.展开更多
文摘Guilin sugar orange has advantages of good taste, harvest during the Spring Festival, marketable market, and it has got swift and violent development in recent years. Sugar orange yield and quality is closely related to meteorological conditions, so in order to study the effect of meteorological conditions on the Guilin sugar orange, the local conditions of each orange-planting county in Guilin is analyzed, and study is also carried out on the severe weather and its defense measures. The suitable growth temperature for sugar orange is 23-29 ℃, and sugar orange is not tolerant to waterlogging and drought, like light, and has no resistance to ice cold. The main meteorological disasters include high temperature, low temperature, flood, drought, wind, hail, etc. Reasonable selection of orchard, scientific management, especially the management of plant diseases and insect pests, is the key to ensure high-quality high sand sugar orange.
基金sponsored by the National Key Technology R&D Program of China (Grant No. 2012BAC16B00)the Natural Science Foundation of China (Grant No. 41371097)
文摘Land-use change is intertwined with tourism because land is used as a resource for human activities.Land-use change also provides an opportunity to evaluate the status of the ecoenvironment.Understanding the relationship between tourism and land use change would help to predict the effect of tourism on land use and encourage sustainable tourism development.Using the Li River Basin as a case study,a hybrid approach using multilevel modeling and logistic regressions was employed to analyze the distribution of land-usechange between 1989 and 2010 to examine potential driving factors.Results reveal that rapid tourism development and construction expansion expose this area to risk of deforestation and forest degradation.Construction increased by 141% between 1989 and 2000 and by 195% between 2000 and 2010.The primary driving force for construction expansion shifted from population growth between 1989 and 2000 to investment growth after 2000.New construction primarily occurred on crop and woodlands areas,with shares of 81.25% and 6.38%,respectively,between 1989 and 2000,and with shares of 57.79% and 15.29%,respectively,between 2000 and 2010.Moreover,these drastic increases in construction also led to frequent transitions between croplands,woodlands,and grasslands.Traits including distances to urban areas and roads and scenic locations exerted significant effects on land-use change.Woodland regrowth in the areas thatsurround scenic locations consisted of fluctuating woodlands,whereas stable woodland regrowth was often absent in these areas.Likewise,permanent woodland clearing tended to be closed to near scenic locations.That is,construction at scenic locations negatively affected forest conservation in the Li River Basin.
基金The National Natural Science Foundation of China(41771115)The National Key Basic Research and Development Program(2015CB452706)The Guizhou “Thousand” Level Innovative Talents Support Project in 2015(111-0317003)
文摘This study investigates the spatial differences and the factors influencing those differences as they affect forest transitions in the Qian-Gui Karst Mountain areas to provide references for policy makers,and ideas for ecological environmental protection strategies and adaptive management strategies for forest restoration projects in mountain areas.Forest transition characteristics are determined in relationship to spatial and functional transitions.SPSS and a geographical detector are used to analyze the forces driving forest transitions in terms of natural environmental and socio-economic factors.The results were as follows:(1)The area of forestland in the Qian-Gui Karst Mountain areas increased by 673.5 km^2 during 1990-2015,and a U-shaped curve generally describes the tendency of this change.More precisely,forest land area decreased initially and increased later,with the turning point occurring in the year 2000.This suggests that the Qian-Gui Karst Mountain areas are being maintained at a later stage of forest transition,and this means they are experiencing a net increase in forest land area.The average annual rainfall and temperature,distance to the nearest river and nearest rural residential area,amplitude of topographical relief,and slope contributed the most to forest spatial transitions.(2)During the study period,the tendency for forest coverage to change varied considerably in different parts of the study area,and the greatest increase occurred in the area of very high forest coverage,an area of 154173.71 km^2.The ranking of other forest coverages tended to decrease during the past 25 years.The vegetation ecosystem,in general,is being maintained in the process of restoration,and changes in the ranking of forest coverage were high in the northern part of the study area and low in the southern part.Forest spatial transitions were affected by the interaction between natural environmental and socio-economic factors,and the average annual temperature and rainfall,elevation,and lighting intensity at night were the most important factors that governed forest functional transitions.An examination of the direction in which spatial and functional transitions are moving in the forest area indicates that ecological construction,rather than spatial expansion of the forest area,should be used in the future to improve forest quality.
