一、日本IGBP国家委员会的建立 在国际科联理事会(1CSU)的组织下,日本于1984年开始IGBP研究的准备,于1987年作为日本学术会议(Science Council of Japan)议长的个人顾问团体,成立了IGBP特别委员会(ad hoc Comittee of IGBP),主席为大岛...一、日本IGBP国家委员会的建立 在国际科联理事会(1CSU)的组织下,日本于1984年开始IGBP研究的准备,于1987年作为日本学术会议(Science Council of Japan)议长的个人顾问团体,成立了IGBP特别委员会(ad hoc Comittee of IGBP),主席为大岛康行教授。1987年7月成立“人类活动与地球环境”专门委员会(Special comittee on“Human Activity and Global Environment”),主席为吉野正敏教授。展开更多
Land use in arid and semi-arid regions has a substantial effect on climate,environment,and biodiversity,thereby projecting the spatiotemporal changes in land use and the subsequent effects.This study employed the loca...Land use in arid and semi-arid regions has a substantial effect on climate,environment,and biodiversity,thereby projecting the spatiotemporal changes in land use and the subsequent effects.This study employed the locally calibrated Future Land Use Simulation(FLUS)model,which coupled system dynamics with cellular automata and integrated an artificial neural network algorithm and a roulette wheel selection mechanism.We projected future land use(2020–2100)dynamics of Lanzhou,a typical river valley city in Northwest China,under three different Shared Socioeconomic Pathway(SSP)scenarios(SSP1-2.6,SSP2-4.5,and SSP5-8.5).The simulation results were validated and subsequently reclassified using the International Geosphere Biosphere Programme(IGBP)system to produce a dataset suitable for driving climatic and environmental models.Under the SSP1-2.6 scenario,urban and built-up land expanded consistently,whereas irrigated cropland and pasture as well as grassland contracted continuously.Conversely,the SSP5-8.5 scenario was characterized by a contraction of urban and built-up land,and relative stability of irrigated cropland and pasture as well as grassland.The SSP2-4.5 scenario presented a more complex trade-off,where urban and built-up land and grassland increased first and then decreased,whereas irrigated cropland and pasture followed an opposite trajectory.A significant inverse relationship between urban and built-up land and irrigated cropland and pasture was observed under all scenarios,underscoring the fundamental spatial competition that prevailed in this land-constrained valley city.Furthermore,the negative correlation of grassland with urban and built-up land,coupled with the positive correlation of grassland with irrigated cropland and pasture under both the SSP1-2.6 and SSP5-8.5 scenarios,indicated an evolution from broad confrontation to intricate internal trade-offs within the urban–agricultural–ecological system.This study underscored the critical influence of regional topographic and hydrological constraints on land-use evolution in arid regions,providing guidance for water resource management and ecosystem protection in Lanzhou,with applications for sustainable land-use planning in other arid and semi-arid river valley cities.展开更多
Land cover products provide critical information for monitoring and analyzing land surface changes.However,notable disagreement and incompatible classification systems among existing land cover products bring challeng...Land cover products provide critical information for monitoring and analyzing land surface changes.However,notable disagreement and incompatible classification systems among existing land cover products bring challenges in using them.Here,we developed a hierarchical International Geosphere-Biosphere Programme(IGBP)classification system and integrated four widely used land cover products(i.e.,MODIS-IGBP,ESA-CCI,GlobeLand30,and GLC_FCS30)based on their accuracy against a collection of global reference samples.We generated a hybrid global annual land cover product(HYBMAP)with~1 km(1/120°,30″)spatial resolution from 2000 to 2020.The HYBMAP integrates information from the four products of high-and medium-resolution and reduces the disagreement between them by up to 20.1%.The overall accuracy of the HYBMAP is 75.5%,which is higher than the best of the four products(MODIS-IGBP,70.9%).HYBMAP also integrates the temporal change information from the four products and identifies a faster growth of built-up lands.The HYBMAP provides more consistent and reliable global land cover time series data for global change research.It is free to access at https://doi.org/10.5281/zenodo.10488191.展开更多
文摘一、日本IGBP国家委员会的建立 在国际科联理事会(1CSU)的组织下,日本于1984年开始IGBP研究的准备,于1987年作为日本学术会议(Science Council of Japan)议长的个人顾问团体,成立了IGBP特别委员会(ad hoc Comittee of IGBP),主席为大岛康行教授。1987年7月成立“人类活动与地球环境”专门委员会(Special comittee on“Human Activity and Global Environment”),主席为吉野正敏教授。
基金supported by the Soft Science Special Project of Gansu Basic Research Plan(25JRZA206)the Longyuan Youth Talent Project of Gansu Province(ZHU Rong)+1 种基金the Innovation Development Special Project of China Meteorological Administration(CXFZ2025J036)the Program of the State Key Laboratory of Cryospheric Science and Frozen Soil Engineering,Chinese Academy of Sciences(CSFSE-KF-2402).
文摘Land use in arid and semi-arid regions has a substantial effect on climate,environment,and biodiversity,thereby projecting the spatiotemporal changes in land use and the subsequent effects.This study employed the locally calibrated Future Land Use Simulation(FLUS)model,which coupled system dynamics with cellular automata and integrated an artificial neural network algorithm and a roulette wheel selection mechanism.We projected future land use(2020–2100)dynamics of Lanzhou,a typical river valley city in Northwest China,under three different Shared Socioeconomic Pathway(SSP)scenarios(SSP1-2.6,SSP2-4.5,and SSP5-8.5).The simulation results were validated and subsequently reclassified using the International Geosphere Biosphere Programme(IGBP)system to produce a dataset suitable for driving climatic and environmental models.Under the SSP1-2.6 scenario,urban and built-up land expanded consistently,whereas irrigated cropland and pasture as well as grassland contracted continuously.Conversely,the SSP5-8.5 scenario was characterized by a contraction of urban and built-up land,and relative stability of irrigated cropland and pasture as well as grassland.The SSP2-4.5 scenario presented a more complex trade-off,where urban and built-up land and grassland increased first and then decreased,whereas irrigated cropland and pasture followed an opposite trajectory.A significant inverse relationship between urban and built-up land and irrigated cropland and pasture was observed under all scenarios,underscoring the fundamental spatial competition that prevailed in this land-constrained valley city.Furthermore,the negative correlation of grassland with urban and built-up land,coupled with the positive correlation of grassland with irrigated cropland and pasture under both the SSP1-2.6 and SSP5-8.5 scenarios,indicated an evolution from broad confrontation to intricate internal trade-offs within the urban–agricultural–ecological system.This study underscored the critical influence of regional topographic and hydrological constraints on land-use evolution in arid regions,providing guidance for water resource management and ecosystem protection in Lanzhou,with applications for sustainable land-use planning in other arid and semi-arid river valley cities.
基金supported by the National Natural Science Foundation of China(42271104)the Shenzhen Funda-mental Research Program(GXWD20201231165807007-20200814213435001)+1 种基金the Shenzhen Science and Tech nology Program(JCYJ20220531093201004)Shenzhen Science and Technology Program(KQTD20221101093604016).
文摘Land cover products provide critical information for monitoring and analyzing land surface changes.However,notable disagreement and incompatible classification systems among existing land cover products bring challenges in using them.Here,we developed a hierarchical International Geosphere-Biosphere Programme(IGBP)classification system and integrated four widely used land cover products(i.e.,MODIS-IGBP,ESA-CCI,GlobeLand30,and GLC_FCS30)based on their accuracy against a collection of global reference samples.We generated a hybrid global annual land cover product(HYBMAP)with~1 km(1/120°,30″)spatial resolution from 2000 to 2020.The HYBMAP integrates information from the four products of high-and medium-resolution and reduces the disagreement between them by up to 20.1%.The overall accuracy of the HYBMAP is 75.5%,which is higher than the best of the four products(MODIS-IGBP,70.9%).HYBMAP also integrates the temporal change information from the four products and identifies a faster growth of built-up lands.The HYBMAP provides more consistent and reliable global land cover time series data for global change research.It is free to access at https://doi.org/10.5281/zenodo.10488191.
