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Modeling of Spring Phenology of Boreal Forest by Coupling Machine Learning and Diurnal Temperature Indicators

Chinese geographical Science 2025年第1期35卷 38-54页

作者： DENG Guorong ZHANG Hongyan HONG Ying GUO Xiaoyi YI Zhihua EHSAN BINIYAZ School of Hydraulic Engineering Nanchang Institute of TechnologyNanchang 330099China Key Laboratory of geographical Processes and Ecological Security in Changbai Mountains Ministry of EducationSchool of Geographical SciencesNortheast Normal UniversityChangchun 130024China Urban Remote Sensing Application Innovation Center School of Geographical SciencesNortheast Normal UniversityChangchun 130024China School of geographical Sciences Inner Mongolia Normal UniversityHohhot 010022China Landscape Ecology and Geoinformation Science Department of GeographyKiel UniversityKiel 24118Germany

The roles of diurnal temperature in providing heat accumulation and chilling requirements for vegetation spring phenology *** previous studies have established a stronger correlation between leaf onset and diurnal temperature than between leaf onset and average temperature,current research on modeling spring phenology based on diurnal temperature indicators remains *** this study,we confirmed the start of the growing season(SOS)sensitivity to diurnal temperature and average temperature in boreal *** estimation of SOS was carried out by employing K-Nearest Neighbor Regression(KNR-TDN)model,Random Forest Regres-sion(RFR-TDN)model,eXtreme Gradient Boosting(XGB-TDN)model and Light Gradient Boosting Machine model(LightGBM-TDN)driven by diurnal temperature indicators during 1982-2015,and the SOS was projected from 2015 to 2100 based on the Coupled Model Intercomparison Project Phase 6(CMIP6)climate scenario *** sensitivity of boreal forest SOS to daytime temperature is greater than that to average temperature and nighttime *** LightGBM-TDN model perform best across all vegetation types,exhibiting the lowest RMSE and bias compared to the KNR-TDN model,RFR-TDN model and XGB-TDN *** incorporating diurn-al temperature indicators instead of relying only on average temperature indicators to simulate spring phenology,an improvement in the accuracy of the model is ***,the preseason accumulated daytime temperature,daytime temperature and snow cover end date emerged as significant drivers of the SOS simulation in the study *** simulation results based on LightGBM-TDN model exhibit a trend of advancing SOS followed by stabilization under future climate *** study underscores the potential of diurn-al temperature indicators as a viable alternative to average temperature indicators in driving spring phenology models,offering a prom-ising new method for simulating spring phenology.

关键词： spring phenology diurnal temperature machine learning future climate scenarios boreal forest

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Relationship Between Developmental Intensity of Landslide and Malan Loess Cohesion at a Regional Horizontal Space Scale

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Journal of Earth Science 2025年

作者： Yongheng Zhou Yaming Tang Bo Hong Fan Feng Longhui Wang institute of Geological survey， China University of Geosciences (Wuhan) institute of Earth Environment， Chinese Academy of Sciences Xi'an Geological survey Center China Geological survey Chinese Academy of Geological Sciences

Malan loess is highly water-sensitive， with its shear strength， particularly cohesive strength， significantly decreasing under the influence of water. The Western Shanxi Loess Plateau （WSLP） is especially prone to loess landslides， which are closely linked to rainfall infiltration. Understanding the regional variation of Malan loess cohesion (cm) and its distribution in relation to the developmental intensity of landslides in this area can provide essential scientific evidence for effective landslide prevention. Loess landslides and Malan loess were selected as the objects of study for the current research. The regional variation and distribution pattern of the cmwere revealed through undisturbed loess direct shear tests and Inverse Distance Weighting （IDW） interpolation. The relationship between the developmental intensity of landslide and the regional variation of the cmwas explored using the Cumulative Sum Variable Dimension Fractal （CSVDF）， Frequency Ratio （FR） model， and Certainty Factor （CF） model. The following conclusions were drawn: Results from the direct shear tests and IDW method indicate that the cmtends to decrease from south to north and exhibits a positively skewed spatial distribution pattern. The CSVDF results indicates a similarity between the regional variation of the cmand the development intensity of loess landslides. The FR and CF results reveal that loess landslides are more likely to occur when the cmis between 0 and 16.14 kPa.

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Spatio-temporal patterns and climatic drivers of spring phenology in eight forest communities across the north-south transitional zone of China

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Journal of geographical Sciences 2025年第1期35卷 17-38页

作者： ZHU Wenbin LU Yu institute of Geographic Sciences and Natural Resources Research CASBeijing100101China School of geographical Science Nanjing University of Information Science&TechnologyNanjing210044China

The Qinba Mountains are climatically and ecologically recognized as the north-south transitional zone of *** of its phenology is critical for comprehending the response of vegetation to climatic *** retrieved the start of spring phenology(SOS)of eight forest communities from the MODIS products and adopted it as an indicator for spring *** analysis,partial correlation analysis,and GeoDetector were employed to reveal the spatio-temporal patterns and climatic drivers of *** results indicated that the SOS presented an advance trend from 2001 to 2020,with a mean rate of−0.473 d yr^(−1).The SOS of most forests correlated negatively with air temperature(TEMP)and positively with precipitation(PRE),suggesting that rising TEMP and increasing PRE in spring would forward and delay SOS,*** dominant factors influencing the sensitivity of SOS to climatic variables were altitude,forest type,and latitude,while the effects of slope and aspect were relatively *** response of SOS to climatic factors varied significantly in space and among forest communities,partly due to the influence of altitude,slope,and aspect.

关键词： spring phenology climatic drivers altitude forest communities lag effect Qinba Mountains

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geographical Engineering and Its Role in Promoting Integrated Geography Research

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Chinese geographical Science 2025年第1期35卷 1-23页

作者： LIU Yansui SU Sixin LI Xuhong institute of Geographic Science and Natural Resources Research Chinese Academy of SciencesBeijing 100101China Faculty of geographical Science and Engineering Henan UniversityZhengzhou 450046China College of Resource and Environment University of Chinese Academy of SciencesBeijing 100049China

Throughout the contemporary Chinese history of geography,geographical engineering has consistently played a pivotal role as a fundamental scientific *** possesses its distinct ontological basis and value orientation,rendering it inseparable from being merely a derivative of geographical science or *** paper defines geographical engineering and introduces its development history through the lens of Chinese geographical engineering ***,it is highlighted the logical and functional consistency between the theory of human-earth system and the praxis of geographical *** modern cases of geographical engineering projects are presented in detail to demonstrate the points and characteristics of different types of modern geographical *** engineering serves as an engine for promoting integrated geography research,and in response to the challenge posed by fragmented geographies,this paper advocates for an urgent revitalization of geographical *** feasibility of revitalizing geographical engineering is guaranteed because it aligns with China’s national strategies.

关键词： geographical engineering geographical science and engineering integrated geography research human-earth system Chinese geography

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Impact of Climate Change on Crop-cropland Coupling Relationship:A Case Study of the Loess Plateau in China

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Chinese geographical Science 2025年第1期35卷 92-110页

作者： LI Shunke LIU Yansui SHAO Yajing WANG Xiaochen College of Urban and Environmental Sciences Northwest UniversityXi’an 710127China institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China Faculty of geographical Science and Engineering Henan UniversityZhengzhou 450046China

Climate change brings new challenges to the sustainable development of agriculture in the new *** grasping the patterns of climate change impacts on agricultural systems is crucial for ensuring agricultural sustainability and food *** the Loess Plateau(LP),China as an example,this study used a coupling coordination degree model and spatial autocorrelation analysis to portray the spatial and temporal features of crop-cropland coupling relationship from 2000 to 2020 and explored the impact law of climate change through geographically and temporally weighted regression(GTWR).The results were as follows:1)the crop-cropland coupling coordination degree of the LP showed a gradual upward trend from 2000 to 2020,forming a spatial pattern with lower values in the central region and higher values in the surrounding areas.2)There was a positive correlation in the spatial distribution of cropcropland coupling coordination degree in the LP from 2000 to 2020,and the high value-low value(H-L)and low value-low value(L-L)agglomerations continued to expand eastward,while the spatial and temporal evolution of the high value-high value(H-H)and low value-high value(L-H)agglomerations was not obvious.3)The impacts of climatic elements on crop-cropland coupling coordination degree in the LP showed strong heterogeneity in time *** inhibitory impacts of summer days(SU)and frost days(FD)accounted for a higher proportion,while the annual average temperature(TEM)had both promoting and inhibiting *** impacts proportion and intensity of extreme heavy precipitation day(R25),continuous drought days(CDD),and annual precipitation(PRE)all experienced significant changes.4)In space,the impacts of SU and FD on the crop-cropland coupling coordination degree varied with latitude and *** adaptability of the LP to R25 gradually strengthened,and the extensions of CDD and increase of PRE led to the increasing inhibition beyond the eastern region of LP,and TEM sh

关键词： climate change crop-cropland coupling relationship geographically and temporally weighted regression(GTWR) extreme weather events Loess Plateau,China

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Experimental Analysis of Resistivity Logging Response of Marine Gas Hydrate Reservoirs

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Journal of Ocean University of China 2025年第1期24卷 85-94页

作者： CHEN Qiang LI Chengfeng WANG Hongbin LIU Changling BU Qingtao SUN Jianye WEI Jiangong KOU Beibei Key Laboratory of Gas Hydrate Ministry of Natural ResourcesQingdao 266071China Qingdao institute of Marine Geology Ministry of Natural ResourcesQingdao 266071China Guangzhou Marine Geological survey China Geological SurveySanya 572024China Guangdong Nanyou Holding Group Company Limited Guangzhou 510075China

Natural gas hydrates are widely distributed in marine and permafrost *** a novel energy resource,accurately describing reservoir characteristics and assessing energy potential is crucial for its commercial *** logging serves as a valuable approach for achieving these ***,due to inadequate comprehension of the electrical conductivity mechanism in hydrate-bearing sediments,existing data processing models still encounter certain *** study conducts both core-scale and pore-scale simulation experiments to examine the relationship between resistivity variations and the distribution of gas hydrate *** results indicate that the characteristics of resistivity variation is associated with the gas hydrate formation process,and the gas hydrate saturation index,denoted as‘n',varies between 0 and 3 depending on different gas hydrate distribution *** the saturation increases,gas hydrate distribution in pore spaces transitions from floating to contacting and cementing *** is proposed that the aqueous pore tortuosity can be utilized to correct the saturation index‘n'in Archie's *** on the analysis of experimental data,a correction method for Archie's equation is suggested,and its effectiveness in controlling relative error has been validated.

关键词： gas hydrate electrical resistivity Archie's equation pore connectivity micro distribution

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CAS-ESM2.0 Dataset for the G1ext Experiment of the Geoengineering Model Intercomparison Project(GeoMIP)

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Advances in Atmospheric Sciences 2025年第3期42卷 579-592页

作者： Min CUI Duoying JI John CMOORE He ZHANG Jiangbo JIN Kece FEI Chenglai WU Jiawen ZHU Juanxiong HE Zhaoyang CHAI Dongling ZHANG College of Earth System Science Faculty of Geographical ScienceBeijing Normal UniversityBeijing 100875China Arctic Centre University of LaplandRovaniemi 96200Finland International Center for Climate and Environment Sciences Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China

Solar radiation modification,a scheme aimed at mitigating rapid global warming triggered by anthropogenic greenhouse gas emissions,has been explored through the G1ext experiment under the Geoengineering Model Intercomparison Project(GeoMIP) framework,utilizing the Chinese Academy of Sciences Earth System Model version 2(CAS-ESM2.0).This paper briefly describes the basic configuration and experimental design of the CAS-ESM2.0 for G1ext,which involves a sudden reduction in solar irradiance to counterbalance the radiative forcing of an abrupt quadrupling of atmospheric CO_(2) concentration,running for 100 *** results show that this model can reproduce well the compensatory effect of a uniform decrease in global solar radiation on the radiative forcing resulting from an abrupt quadrupling of CO_(2) *** other Earth system models,CAS-ESM2.0 reasonably captures variations in radiative adjustments,surface air temperature,and precipitation patterns,both globally and locally,under the G1ext *** generated datasets have been released on the Earth System Grid Federation data server,providing insight into the potential efficacy and impact of solar geoengineering strategies.

关键词： CAS-ESM2.0 GeoMIP geoengineering radiative adjustment temperature precipitation

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Pyrite Geochemistry and S-Hg Isotopes Reveal the Ore Genesis of the Hydrothermal Vein-type Cuiluan Ag-Pb-Zn Deposit in NE China

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Journal of Earth Science 2025年

作者： Lidong Zhang Changzhou Deng Yao Tang Xinran Ni Bizheng Yang Shanshan Liang Weipeng Liu Jishuang Ding Xiaohui Zeng Heilongjiang institute of Natural Resources survey State Key Laboratory of Ore Deposit Geochemistry， institute of Geochemistry， Chinese Academy of Sciences College of Earth and Planetary Sciences， Chengdu University of Technology

The Xing'an-Mongolian orogenic belt is an important Ag-Pb-Zn metallogenic province in China. The study on the genesis of the newly discovered Cuiluan hydrothermal vein-type Ag-Pb-Zn deposit located in the Lesser Xing'an Range， within the eastern of Xing'an-Mongolian orogenic belt， is pivotal in understanding the metallogenic mechanism and regularity of Ag-Pb-Zn deposits in this region. This study utilizes pyrite trace elements and sulfur isotopic geochemistry， and mercury isotope of rocks and ores to constrain the genesis of the Cuiluan deposit. Pyrite geochemical data show that Ag exists in the form of galena inclusions (Ag++(Bi3+， Sb3+) ? Pb2+) in the polymetallic sulfide stage， and independent Ag-bearing minerals （matildite and gustavite） precipitate during the main mineralization stage. The small varied δ34S values （3.24‰ - 4.94‰） of pyrites from four hydrothermal stages are within the range of magmatic S isotopes， indicating that the ore-forming fluid of the Cuiluan deposit mainly originated from the magma. The Δ199Hg values of the ores are close to 0‰， which are consistent with the Δ199Hg values of mantle， further indicating that the ore-forming materials came from the lithospheric mantle. Combined with the regional tectonic evolution， we conclude that the plate subduction of Paleo-oceans in NE China triggered the partial melting of metasomatized mantle. The mantle-derived magma rose along the deep fractures and evolved ore-forming fluids， and finally caused the formation of Cuiluan quartz vein-type Ag-Pb-Zn deposit in the shallow crust. Accompany with previous documents， we infer that the fractures in the large-scale “Granite Sea” in the Lesser Xing'an Range may have significant potential for vein-type Ag-Pb-Zn exploration.

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Standardized framework for assessing soil quality at antimony smelting site by considering microbial-induced resilience and heavy metal contamination

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Journal of Environmental Sciences 2025年第2期148卷 306-320页

作者： Shasha Jiang Xiaoyu Deng Liyuan Ma Hongmei Wang Xingjie Wang Liang Feng Feng Zhu Shengguo Xue Arif Mohammad School of Environmental Studies China University of GeosciencesWuhan 430074China School of Engineering Cardiff UniversityCardiff CF243AAUnited Kingdom institute of Geological survey China University of GeosciencesWuhan 430074China School of Metallurgy and Environment Central South UniversityChangsha 410083China

Antimony smelting activities damage the soil and vegetation surroundings while generating economic ***,no standardizedmethods are available to diagnose the extent of soil degradation at antimony smelting *** study developed a standardized framework for assessing soil quality by consideringmicrobial-induced resilience and heavymetal contamination at Xikuangshan antimony smelting *** soil resilience index(SRI)and soil contamination index(SCI)were calculated byMinimum Data Set and geo-accumulation model,*** standardized by a multi-criteria quantitative procedure of modified Nemerow’s pollution index(NPI),the integrated assessment of soil quality index(SQI),which is the minimumof SRINPI and SCINPI,was *** results showed that Sb and As were the prominent metal(loid)pollutants,and significant correlations between SQI and SRI indicated that the poor soil quality was mainly caused by the low level of soil *** primary limiting factors of SRI were Fungi in high andmiddle contaminated areas,and Skermanella in low contaminated area,suggesting that the weak soil resilience was caused by low specific microbial *** regulation and phytoremediation are greatly required to improve the soil quality at antimony smelting sites from the perspectives of pollution control and resilience *** study improves our understanding of ecological effects of antimony smelting sites and provides a theoretical basis for ecological restoration and sustainable development of mining areas.

关键词： Antimony smelting site Soil resilience index(SRI) Soil contamination index(SCI) Microorganisms Nemerow’s pollution index(NPI)

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Carboniferous-Early Permian heterogeneous distribution of porous carbonate reservoirs in the Central Uplift of the South Yellow Sea Basin and its hydrocarbon potential analysis

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China Geology 2025年第1期8卷 58-76页

作者： Shu-yu Wu Jun Liu Jian-wen Chen Qi-liang Sun Yin-guo Zhang Jie Liang Yong-cai Feng School of Engineering China University of GeoscienceWuhan 430074China Yantai Center of Coastal Zone Geological survey China Geological SurveyMinistry of Natural ResourcesYantai 264001China Key Laboratory of Submarine Geosicences Ministry of Natural ResourcesHangzhou 310012China Chinese Academy of Geological Sciences China Geological SurveyMinistry of Natural ResourcesBeijing 100037China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266061China The Key Laboratory of Gas Hydrate Ministry of Natural ResourcesQingdao Institute of Marine GeologyChina Geological SurveyMinistry of Natural ResourcesQingdao 266071China College of Marine Science and Technology China University of GeoscienceWuhan 430074China

Mesozoic-Palaeozoic marine carbonate rocks are crucial hydrocarbon reservoirs in the Central Uplift area of the South Yellow Sea Basin(SYSB).Due to the scarcity of boreholes and the significant heterogeneity of carbonate reservoirs,the distribution of porous carbonate reservoirs and their related key controlling factors remain *** this study,factors affecting the distribution of porous Carboniferous-Early Permian carbonate reservoirs in the SYSB were investigated through seismic inversion and isotope *** log-seismic characteristics of porous carbonate reservoirs,sensitive lithology parameters,and physical property parameters were extracted and *** pre-stack simultaneous inversion technique was applied to predict the lithology and physical properties of porous carbonate ***,the sedimentary of carbonate was analyzed using isotopes of carbon,oxygen,and *** results show that porous carbonate reservoirs are mainly developed in the open platform sediments with porosities of 3%-5%and are mainly distributed in the paleo-highland(Huanglong Formation and Chuanshan Formation)and the slope of paleo-highland(Hezhou Formation).The porous carbonate reservoirs of the Qixia Formation are only locally *** addition,the negativeδ13C excursions indicate a warm and humid tropical climate with three sea-level fluctuations in the study area from the Carboniferous to Early *** favorable conditions for developing porous carbonate rocks include the sedimentary environment and diagenetic *** primary pore tends to form in high-energy environments of the paleo-highland,and the secondary pore is increased by dissolution during the syngenetic or quasi-syngenetic *** to the hydrocarbon potential analysis,the Late Ordovician Wufeng Formation and Lower Silurian Gaojiabian Formation are the source rocks in the high-maturity-over-maturity stage,the Carboniferous-Lower Permian carbonate is the good reservoirs,and th

关键词： Sedimentary Heterogeneous porous carbonate reservoirs C-H-Sr isotope analysis Carboniferous-Early Permian Chuanshan Formation Huanglong Formation Pre-stack simultaneous inversion technique Oil-gas exploration engineering Hydrocarbon accumulation Hydrocarbon potential Central Uplift of the South Yellow Sea Basin

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