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Grain size and surface micro-texture characteristics and their paleoenvironmental significance of Holocene sediment in southern margin of the Gurbantunggut Desert,China

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Journal of Arid Land 2024年第5期16卷 632-653页

作者： MA Yunqiang LI Zhizhong TAN Dianjia ZOU Xiaojun TAO Tonglian School of geographical Sciences Fujian Normal UniversityFuzhou 350117China Key laboratory for humid subtropical eco-geographical processes of the ministry of education Fujian Normal UniversityFuzhou 350117China Institute of Geography Fujian Normal UniversityFuzhou 350117China

The southern margin of the Gurbantunggut Desert,China,is characterized by alternating layers of aeolian and alluvial *** the characteristics of arenaceous sediment in this area is of significant importance for understanding the interactive processes of wind and water forces,as well as the provenance of ***,there are relatively few investigations on the characteristics of such sediment at *** this study,we researched three aeolian-alluvial interactive stratigraphic profiles and different types of surface sediment on the desert-oasis transitional zone of southern margin of the Gurbantunggut *** on the optically stimulated luminescence(OSL)dating of aeolian sand and analyses of quartz sand grain size and surface micro-texture,we explored the aeolian-alluvial environmental change at southern margin of the desert in Holocene,as well as the provenance of *** results indicated that the grain size characteristics of different types of sediment in the stratigraphic profiles were similar to those of modern dune sand,interdune sand,muddy desert surface soil,and riverbed *** frequency curves were unimodal or bimodal,and cumulative probability curves were two-segment or three-segment,mainly composed of suspension load and saltation *** quartz sand in the sediment at southern margin of the desert had undergone alternating transformation of various exogenic forces,with short transportation distance and time,and sedimentary environment was relatively *** Holocene,southern margin of the desert primarily featured braided river deposits,and during intermittent period of river activity,there were also aeolian deposits such as sand sheet deposits,stabilized dune deposits,and mobile dune *** provenance for Holocene alluvial deposits at southern margin of the desert remains relatively constant,with the debris of the Tianshan Mountains being the primary *** sand is mainly near-source recharge,

关键词： aeolian-alluvial deposition grain size surface micro-texture sedimentary environment Holocene

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Dynamics of iron and aluminum storages in a subtropical forest headwater stream

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Journal of Mountain Science 2024年第7期21卷 2193-2205页

作者： YI Qiumeng MA Diting PENG Yan ZHAO Zemin YUAN Chaoxiang YUAN Ji NI Xiangyin WU Fuzhong YUE Kai AN Nannan Key laboratory of humid subtropical eco-geographical processes of ministry of education School of Geographical SciencesFujian Normal UniversityFuzhou 350117China Fujian Sanming Forest ecosystem National Observation and Research Station Sanming 365002China

The forest headwater streams are important hubs for connecting terrestrial and aquatic ecosystems,with plant litter and sediments as the major carriers for material migrations;however,until now we knew little about the dynamics of trace elements such as iron(Fe)and aluminum(Al)in forest headwater ***,we quantitatively identified the spatiotemporal dynamics of Fe and Al storages in plant litter and sediments and their influencing factors in a subtropical forest headwater stream,and assessed the potential pollution *** results showed that:(1)the mean concentrations of Fe and Al in plant litter(sediments)were 5.48 and 8.46(7.39 and 47.47)g·kg^(-1),and the mean storages of Fe and Al in plant litter(sediments)were 0.26 and 0.43(749.04 and 5030.90)g·m^(-2),respectively;(2)the storages of Fe and Al in plant litter and sediments significantly fluctuated from January to December,and showed a decreasing pattern from the source to mouth;and(3)storages of Fe and Al had no significant correlation with riparian forest type and the present of tributary and the Fe and Al storages in plant litter were mainly affected by water temperature and water alkalinity,and their storages in sediments were mainly affected by water temperature and frequency of rainfall;and(4)there were no anthropogenic pollution in Fe and Al in the forest headwater *** study revealed the primary factors of concentrations and storages of Fe and Al in plant litter and sediments in a forest headwater stream,which will improve our understanding of the role of headwater streams in forest nutrient storage and cycling along with hydrological processes.

关键词： Plant litter Sediments Storage Forest headwater stream Stream characteristics Trace element

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Dynamics of iron and aluminum storages in a subtropical forest headwater stream

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Journal of Mountain Science 2024年第8期 2579-2591页

作者： YI Qiumeng MA Diting PENG Yan ZHAO Zemin YUAN Chaoxiang YUAN Ji NI Xiangyin WU Fuzhong YUE Kai AN Nannan Key laboratory of humid subtropical eco-geographical processes of ministry of education School of Geographical Sciences Fujian Normal University Fujian Sanming Forest ecosystem National Observation and Research Station

The forest headwater streams are important hubs for connecting terrestrial and aquatic ecosystems, with plant litter and sediments as the major carriers for material migrations; however, until now we knew little about the dynamics of trace elements such as iron（Fe） and aluminum（Al） in forest headwater streams. Here, we quantitatively identified the spatiotemporal dynamics of Fe and Al storages in plant litter and sediments and their influencing factors in a subtropical forest headwater stream, and assessed the potential pollution risk. The results showed that:（1） the mean concentrations of Fe and Al in plant litter（sediments） were 5.48 and 8.46（7.39 and 47.47） g·kg-1, and the mean storages of Fe and Al in plant litter（sediments） were 0.26 and 0.43（749.04 and 5030.90） g·m-2, respectively;（2） the storages of Fe and Al in plant litter and sediments significantly fluctuated from January to December, and showed a decreasing pattern from the source to mouth; and（3） storages of Fe and Al had no significant correlation with riparian forest type and the present of tributary and the Fe and Al storages in plant litter were mainly affected by water temperature and water alkalinity, and their storages in sediments were mainly affected by water temperature and frequency of rainfall; and（4） there were no anthropogenic pollution in Fe and Al in the forest headwater stream. Our study revealed the primary factors of concentrations and storages of Fe and Al in plant litter and sediments in a forest headwater stream, which will improve our understanding of the role of headwater streams in forest nutrient storage and cycling along with hydrological processes.

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Excessive manure application stimulates nitrogen cycling but only weakly promotes crop yields in an acidic Ultisol:Results from a 20-year field experiment

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Journal of Integrative Agriculture 2024年第7期23卷 2434-2445页

作者： Song Wan Yongxin Lin Hangwei Hu Milin Deng Jianbo Fan Jizheng He Key laboratory for humid subtropical eco-geographical processes of ministry of education School of Geographical Sciences/School of Carbon Neutrality Future TechnologyFujian Normal UniversityFuzhou 350007China School of Agriculture and Food Faculty of ScienceThe University of MelbourneParkvilleVictoria 3010Australia State Key laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China

Population growth and growing demand for livestock products produce large amounts of manure,which can be harnessed to maintain soil sustainability and crop ***,the impacts of excessive manure application on crop yields,nitrogen(N)-cycling processes and microorganisms remain ***,we explored the effects of 20-year of excessive rates(18 and 27 Mg ha^(–1)yr^(–1))of pig manure application on peanut crop yields,soil nutrient contents,N-cycling processes and the abundance of N-cycling microorganisms in an acidic Ultisol in summer and winter,compared with none and a regular rate(9 Mg ha^(–1)yr^(–1))of pig manure ***-term excessive pig manure application,especially at the high-rate,significantly increased soil nutrient contents,the abundance of N-cycling functional genes,potential nitrification and denitrification activity,while it had a weaker effect on peanut yield and plant *** with manure application,seasonality had a much weaker effect on N-cycling gene *** forest analysis showed that available phosphorus(AP)content was the primary predictor for N-cycling gene abundance,with significant and positive associations with all tested N-cycling *** study clearly illustrated that excessive manure application would increase N-cycling gene abundance and potential N loss with relatively weak promotion of crop yields,providing significant implications for sustainable agriculture in the acidic Ultisols.

关键词： denitrification manure amendment nitrification N-cycling functional genes peanut yields

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Spatiotemporal pattern of climate change in the China-Myanmar economic Corridor from 1901 to 2018

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Journal of Mountain Science 2024年第1期21卷 131-145页

作者： YANG Xiaoliu LI Yungang GAO Lu Institute of Geography Fujian Normal UniversityFuzhou 350117China School of geographical Sciences Fujian Normal UniversityFuzhou 350117China Institute of International Rivers and eco-Security Yunnan UniversityKunming 650500China Fujian Provincial Engineering Research Center for Monitoring and Accessing Terrestrial Disasters Fujian Normal UniversityFuzhou 350117China Key laboratory for humid subtropical eco-geographical processes of the ministry of education Fujian Normal UniversityFuzhou 350117China

The China-Myanmar economic Corridor(CMEC) is an important part of China's Belt and Road Initiative and an important area for global ecology and biodiversity. In this study, the annual and seasonal spatiotemporal patterns of temperature and precipitation in the CMEC over the past century were investigated using linear tendency estimation, the Mann-Kendall mutation test, the T-test, and wavelet analysis based on the monthly mean climatic data from 1901 to 2018 released by the Climatic Research Unit(CRU) of the University of East Anglia, UK. The results show that the CMEC demonstrated a trend of warming and drying over the past 100 years, and the rate of change in Myanmar was stronger than that in Yunnan Province of China. The warming rate was 0.039 ℃/10a. Precipitation decreased at a rate of -6.1 mm/10a. From the perspective of spatial distribution, temperature was high in the central and southern, low in the north of the CMEC, and the high-temperature centers were mainly distributed in the southern plain and river valley. Precipitation decreased from west to east and from south to north of the CMEC. From the perspective of the rate of change, warming was stronger in central and northern CMEC than in southern and northeastern CMEC. The rate of precipitation decline was stronger in the central and western regions than in the eastern region. This study provides a scientific reference for the CMEC to address climate change and ensure sustainable social and economic development and ecological security.

关键词： China-Myanmar economic Corridor CRU Air temperature Precipitation Spatiotemporal pattern

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Elevational distribution of forests and its spatiotemporal dynamics in subtropical China from 2000 to 2019

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Science China Earth Sciences 2024年第8期67卷 2563-2582页

作者： Zhencan ZHENG Liuwen ZHUANG Guofang MIAO Han LIU Zhiqiang CHENG Wenyu LI Rong SHANG Peng GONG Jing Ming CHEN Institute of Geography Fujian Normal University Key laboratory of humid subtropical eco-geographical Process (ministry of education) Fujian Normal University School of geographical Sciences Fujian Normal University National Land Consolidation Center Ministry of Natural Resources Key laboratory of Land Consolidation and Rehabilitation Ministry of Natural Resources Key laboratory of Digital Mapping and Land Information Application Ministry of Natural Resources Department of Geography & Planning University of Toronto Department of Geography The University of Hong Kong

The subtropical region of China possesses abundant forest resources and features a mountainous *** the implementation of policies such as natural forest protection,the Grain for Green Project,and other initiatives since the beginning of the 21st century,coupled with climate change,the forest resources in this region have undergone significant changes compared to historical *** addition,forest resources distributing mainly in mountainous areas also implies that these changes may vary significantly with *** explore the spatiotemporal dynamics of forest distribution in subtropical China since 2000,especially the trend of changes with elevation,we analyzed the data from two land cover products focusing on forest cover and forest *** used a hierarchical approach,in which coarse-classification forest cover data with relatively small uncertainties impose constraints on forest type data with larger uncertainties,to achieve a reasonable balance between obtaining more details and reducing data *** first divided the forest cover data into‘unchanged'and‘changed'*** the constraints by the forest cover results,we further analyzed the‘unchanged'and‘changed'forest *** results indicated that,since the implementation of ecological engineering and management policies,54%of the area in the subtropical region had maintained unchanged forest cover attributes over the past 20 years,which implied the good state of ecological *** results also showed that dynamic conversions existed in the long term between forests and lands for essential production needs like *** elevational variations of forest cover suggested that the dominant changes came from the conversion between forests and croplands in low-elevation regions below 700 m,the conversion between forests and shrublands in mid-elevation regions of 700–1500 m,and the conversion between forests and grasslands in high-elevation regions above 2000 *** the regio

关键词： subtropical China Land cover Forest cover Forest type Elevational distribution

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Surface air temperature change in the Wuyi Mountains,southeast China

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Journal of Mountain Science 2024年第6期21卷 1992-2004页

作者： QIN Yihui WEI Yuxing LU Jiayi MAO Jiahui CHEN Xingwei GAO Lu CHEN Ying LIU Meibing DENG Haijun Institute of Geography Fujian Normal UniversityFuzhou 350117China National Demonstration Center for Experimental Geography education Fujian Normal UniversityFuzhou 350117China School of geographical Science Fujian Normal UniversityFuzhou 350117China Fujian Provincial Engineering Research Center for Monitoring and Assessing Terrestrial Disasters Fujian Normal UniversityFuzhou 350117China laboratory for humid subtropical eco-geographical processes of the ministry of education Fujian Normal UniversityFuzhou 350117China

Detecting changes in surface air temperature in mid-and low-altitude mountainous regions is essential for a comprehensive understanding of warming trend with *** use daily surface air temperature data from 64 meteorological stations in Wuyi Mountains and its adjacent regions to analyze the spatio-temporal patterns of temperature *** results show that Wuyi Mountains have experienced significant warming from 1961 to *** warming trend of the mean temperature is 0.20℃/decade,the maximum temperature is 0.17℃/decade,and the minimum temperature is 0.26℃/*** 1961-1990,more than 63%of the stations showed a decreasing trend in annual mean temperature,mainly because the maximum temperature decreased during this ***,in 1971-2000,1981-2010 and 1991-2018,the maximum,minimum and mean temperatures *** fastest increasing trend of mean temperature occurred in the southeastern coastal plains,the quickest increasing trend of maximum temperature occurred in the northwestern mountainous region,and the increase of minimum temperature occurred faster in the southeastern coastal and northwestern mountainous regions than that in the central ***,this study suggests that elevation does not affect warming in the Wuyi *** results are beneficial for understanding climate change in humid subtropical middle and low mountains.

关键词： Climate change Surface air temperature Temporal and spatial changes Mann-Kendall nonparametric test Wuyi Mountains

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亚热带森林中树木大小可调控功能性状与存活率之间的关系

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Journal of Plant ecology 2024年第3期17卷 63-72页

作者： Zhen-Yu Wang Zhi-Qun Huang Key laboratory of humid subtropical eco-geographical Process of ministry of education Fujian Normal UniversityFuzhou 350007China School of geographical Science Fujian Normal UniversityFuzhou 350007China

使用功能性状来预测植物的存活率是生态学研究中的一个挑战。然而,由于对根系性状的研究较少,根系和叶片性状与树木存活率的一致性尚不确定。此外,植物性状与存活率之间的关系通常是非线性的,并且可能会随着树木大小的变化而变化。本研... 详细信息

使用功能性状来预测植物的存活率是生态学研究中的一个挑战。然而,由于对根系性状的研究较少,根系和叶片性状与树木存活率的一致性尚不确定。此外,植物性状与存活率之间的关系通常是非线性的,并且可能会随着树木大小的变化而变化。本研究整合了在亚热带纯林中生长的32个常见树种共17901棵树的存活率数据,以检验根系和叶片性状与树木存活率的一致性,以及这些性状与存活率之间的关系如何随树木地径大小的变化而变化。结果发现,叶片和根系性状对树木存活率的影响并不一致。具体而言,代表获取策略的比叶面积对存活率有边际显著的负影响,而在一维根经济谱中代表保守策略的根直径也对存活率有显著的负影响。此外,性状与树木存活率之间的关系受到树木大小的调控。比叶面积、叶磷浓度和比根长对存活率的影响随着树木大小的增加由负转正。然而,叶厚度和根直径仅对地径较小的树木的存活率有正效应。上述结果表明,若要准确预测植物性状与存活率的关系,需同时考虑地上和地下性状,以及调控这种关系的树木大小信息。

关键词：森林动态多维性植物表现植物策略根系经济谱

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Applicability and improvement of different potential evapotranspiration models in different climate zones of China

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ecological processes 2024年第1期13卷 262-282页

作者： Zedong Li Yiran Li Xinxiao Yu Guodong Jia Peng Chen Pengfei Zheng Yusong Wang Bingbing Ding Key laboratory of Soil & Water Conservation and Desertification Combating of ministry of education Beijing Forestry University College of Horticulture and Forestry Sciences Tarim University State Key laboratory of Earth Surface processes and Resource ecology Faculty of Geographical Science Beijing Normal University

Background Accurate estimation of potential evapotranspiration(PET) is the key for studying land-air interaction hydrological processes. Several models are used to estimate the PET based on standardized meteorological data. Although combination-based models have the highest level performance estimation of PET, they require more meteorological data and may therefore be difficult to apply in areas lacking meteorological observation *** The results showed significant differences in the spatial trends of PET calculated by different models in China, the Doorenbots–Pruitts model revealed the highest PET(1902.6 mm), and the Kuzmin model revealed the lowest PET(349.6 mm), with the largest difference being 5.5 times. The Romanenko and the Rohwer models were the recommended temperature-based and aerodynamic-based models. On the other hand, the Abtew model was more suitable for arid and semi-arid regions, while the Priestley–Taylor model was more suitable for humid regions. Combination-based models revealed ideal calculation accuracies, among which the Penman–Monteith model was the best option for PET *** The accuracy range of Romanenko, Rohwer, Abten, Priestley Taylor, and Penman Monteith models improved in MPZ and TCZ is higher than that improved in TMZ and SMZ. This does not mean that the improved models have higher accuracy in MPZ and TCZ than in TMZ and SMZ. On the contrary, the original model performed poorly in MPZ and TCZ, so the improved accuracy was relatively large. The unimproved model was already more suitable in TMZ and SMZ, so the improved accuracy was relatively small. Therefore, regional calibration of the PET models can improve the accuracy and applicability of PET calculation, providing a reference for studying hydrological processes in different climatic zones.

关键词： Potential evapotranspiration Climatic zone Temperature-based model Aerodynamic-based model Radiation-based model Combination-based model Model calibration

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Half-precessional cycle revealed by environment magnetism of stalagmite in Shizhu Cave from southwestern China during the Last Glacial

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Journal of Earth Science 2024年

作者： Huihui Yang Yu-Min Chou Xiuyang Jiang Wenyue Xia Hai Li Yi Zhong Jingyu Zhang Yaoqi He Tsai-Luen Yu Qingsong Liu Chuan-Chou Shen College of Tourism and Air Service Guizhou Minzu University Research Center for Future Earth Taiwan University Southern Marine Science and Engineering Guangdong laboratory (Guangzhou) School of Environment Harbin Institute of Technology High-Precision Mass Spectrometry and Environment Change laboratory (HISPEC) Department of Geosciences Taiwan University Key laboratory of humid subtropical eco-geographical processes College of Geography Science Fujian Normal University Center for Marine Magnetism (CM2) Department of Ocean Science and Engineering Southern University of Science and Technology

The environmental magnetic proxies of stalagmites hold significant potential for reconstructing regional hydroclimate changes by revealing the content and grain size of magnetic particles within stalagmites. In this study， we present the contents and grain sizes of magnetic particles within a stalagmite SZ-1， from Shizhu Cave in southwestern China from 70.4 to 22.3 thousand years ago (ka) during the last glacial period. Specifically， the parameters IRMsoft， soil-derived magnetic minerals， and ARM/SIRM (anhysteretic remanent magnetization/saturation isothermal remanent magnetization)， the ratio of fine magnetic particles to total ferrimagnetic particles preserved in stalagmite SZ-1， indicate the fluctuation of regional precipitation. Obvious half-precessional cycles are evident in these two proxies， indicating that hydroclimatic variations in southwestern China may predominantly arise from the heat and moisture transported from tropical oceans. These variations are likely influenced by shifts in the Intertropical Convergence Zone and fluctuations in the Asian summer monsoon.

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