沉积学报2025，Vol.43Issue(6)：1992-2003,12.DOI:10.14027/j.issn.1000-0550.2024.003
东北沙地化学风化强度的空间分布特征及其影响因素
Spatial Distribution Characteristics and Influencing Factors of Chemical Weathering Intensity for Sandy Land in Northeast China
摘要
Abstract
[Objective]Chemical weathering is a key geological process that regulates the long-term climate of the Earth and participates in the global carbon cycle.It plays a key role in the evolution of terrestrial climate and paleo-climate reconstruction,shaping the surface morphology and sustaining life.[Methods]The chemical weathering char-acteristics of fine particle components(<63 μm)of 89 aeolian and fluvial sand samples from four major sandy lands in Northeast China(Hunshandake sandy land,Horqin sandy land,Songnen sandy land,and Hulunbuir sandy land)were analyzed to reveal the spatial distribution characteristics of chemical weathering in the Northeast sandy land.To evaluate the correlation between 13 different weathering indices and climate factors(annual average temperature and precipitation)and the main influencing factors controlling the chemical weathering degree of the Northeast sandy land.[Results]The results showed that when the same chemical weathering index(such as Chemical Index of Altera-tion,CIA)was used to reconstruct the chemical weathering characteristics of sandy land,the spatial distribution of different sandy lands was poor,the correlation between the same weathering index and climate factors was poor(r≤0.4,p>0.05).However,different weathering indices showed clear spatial distribution rules when reconstructing the distribution characteristics of chemical weathering in the Northeast sandy land,and the correlation with climate factors was better in different sandy lands(r≥0.6,p≤0.05),indicating that different weathering indices had different sensitivities to climate in different regions.Therefore,the chemical weathering measured by different indices in the Northeast sandy land is controlled by climate factors,but the correlation between chemical weathering intensity and temperature and precipitation of different sandy lands is still significantly different.In general,most of the chemical weathering areas reconstructed with different indices in the Northeast sandy land are in a low chemical weathering intensity,and the distribution range of chemical weathering high value is small,and there are clear spatial distribu-tion characteristics.The intensity of chemical weathering in Hunshandake sandy land,eastern Horqin sandy land and Songnen sandy land is affected by precipitation factors.The temperature and precipitation changes are influenced by fluvial action,monsoon precipitation,geographical location,and vegetation coverage,which indirectly affect the occurrence of chemical weathering.The chemical weathering intensity in the west Horqin sandy land is mainly affected by temperature factors and controlled by terrain and higher average annual temperature.The chemical weathering in-tensity of Hulunbuir sandy land is weakly affected by temperature and precipitation factors,and non-climatic factors(such as terrain,wind erosion,physical weathering,and vegetation coverage)may weaken the influence of climate on chemical weathering.[Conclusions]In summary,the degree of chemical weathering in the Northeast sandy land is mainly controlled by climatic conditions(temperature and precipitation),but the sensitivity of chemical weather-ing represented by different chemical weathering indices to climate is significantly different in different sandy lands.Therefore,careful choices should be made when using chemical weathering indices of sediments for paleo-climate and paleo-climate reconstruction.关键词
东北沙地/化学风化强度/气候/空间分布/相关性分析Key words
Northeast sandy land/chemical weathering intensity/climate/spatial distribution/correlation analysis分类
天文与地球科学引用本文复制引用
ZHAO WanTing,LIU HaiJin,WANG YanRu,XIE YuanYun,CHI YunPing,KANG ChunGuo,WANG YeHui,WU Peng,SUN Lei,WEI ZhenYu..东北沙地化学风化强度的空间分布特征及其影响因素[J].沉积学报,2025,43(6):1992-2003,12.基金项目
黑龙江省自然科学基金项目(ZD2023D003) （ZD2023D003）
国家自然科学基金项目(42171006,41601200)[Natural Science Foundation of Heilongjiang Province,No.ZD2023D003 （42171006,41601200）
National Natural Science Foundation of China,No.42171006,41601200] （）
