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

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 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.

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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Resorption Efficiency of Four Cations in Different Tree Species in a Subtropical Common Garden

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Phyton-International Journal of Experimental Botany 2022年第1期91卷 185-196页

作者： Yaoyi Zhang xiangyin ni Jing Yang Siyi Tan Shu Liao Dingyi Wang Kai Yue Fuzhong Wu Key Laboratory for Humid Subtropical Eco-Geographical Processes of the Ministry of Education School of Geographical SciencesFujian Normal UniversityFuzhou350007China

High rainfall in subtropical regions can leach cation elements from ecosystems,which may limit plant growth.Plants often develop efficient resorption patterns to recycle elements,but there is relatively little available information on this topic.In February 2012,a common garden was established in a subtropical forest by planting dominant trees from the area.Green and senescent leaves were sampled from 11 tree species.The concentrations of potassium(K),calcium(Ca),sodium(Na)and magnesium(Mg)were determined,and the resorption efficiencies were calculated.The results showed significant K,Na and Mg resorption in most of the investigated tree species,while Ca mainly displayed accumulation.Evergreen coniferous and evergreen broad-leaved trees(such as Cunninghamia lanceolata,Pinus massoniana,Cinnamomum camphora,and Michelia macclurei)exhibited relatively higher resorption efficiencies of K(39.0%-87.5%)and Na(18.3%-50.2%)than deciduous broad-leaved trees.Higher Mg resorption efficiencies(>50%)were detected in Liriodendron chinense,C.lanceolata and P.massoniana than in other trees.Overall,evergreen coniferous and evergreen broad-leaved trees could show higher cation resorption than deciduous broad-leaved trees.K and Mg resorption efficiencies and Ca accumulation decrease with increasing nutrient concentrations in green leaves.Our results emphasize that nutrient resorption patterns largely depend on elements and plant functions,which provides new insights into the nutrient use strategies of subtropical plants and a reference for the selection of suitable tree species in this region.

关键词： Nutrient use strategy cations common-garden trees nutrient resorption subtropical forest

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Changes in soil faunal density and microbial community under altered litter input in forests and grasslands

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Fundamental Research 2022年第6期2卷 954-963页

作者： Xinyu Wei Fuzhong Wu Petr Heděnec Kai Yue Yan Peng Jing Yang Xiaoyue Zhang xiangyin ni Key Laboratory for Humid Subtropical Eco-Geographical Processes of the Ministry of Education School of Geographical SciencesFujian Normal UniversityFuzhou 350007China Agritec Plant Research Ltd. Zemědělská16Šumperk 78701Czech Republic Institute of Tropical Biodiversity and Sustainable Development University Malaysia TerengganuKuala NerusTerengganu 21030Malaysia

Root and foliar litter inputs are the primary sources of carbon and nutrients for soil fauna and microorganisms,yet we still lack a quantitative assessment to evaluate the effects of root and foliar litter on various groups of soil organisms across terrestrial ecosystems.Here,we compiled 978 paired observations from 68 experimental sites to assess the directions and magnitudes of adding and removing foliar and root litter on the soil faunal density and microbial biomass that was evaluated by phospholipid fatty acids(PLFAs)across forests and grasslands worldwide.We found that litter addition had only a marginal effect on soil faunal density but significantly increased the soil total microbial-,fungal-and bacterial-PLFAs by 13%,14%,and 10%,respectively,across ecosystems,suggesting that the soil microbial community is more sensitive to carbon source addition than soil fauna,particularly in soils with low carbon to nitrogen ratios.In contrast,removing litter significantly decreased the soil faunal density by 17%but had few effects on soil microorganisms.Compared with foliar litter,root litter input had a more positive effect on the development of soil fungal taxa.The effect of both litter addition and removal on soil faunal density and microbial biomass did not differ between humid and arid regions,but a greater influence was observed in grasslands than in forests for soil microbial community.Our results highlight that the increasing litter production under a global greening scenario would stimulate microbial activity in grasslands more than in forests,and this stimulation would be greater for soil microbes than soil fauna.

关键词： Detritus input and removal treatment Soil fauna Bacteria Fungi Phospholipid fatty acids

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Gap edge canopy buffering of throughfall deposition in a subalpine natural forest

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Forest Ecosystems 2022年第4期9卷 503-510页

作者： Siyi Tan Qing Dong xiangyin ni Kai Yue Shu Liao Fuzhong Wu Key Laboratory for Humid Subtropical Eco-Geographical Processes of the Ministry of Education School of Geographical SciencesFujian Normal UniversityFuzhou350007China Ecological Security and Protection Key Laboratory of Sichuan Province Mianyang Teachers'CollegeMianyang621000China

Base cation loads are rarely considered in forest gap edge canopies,but they can play critical roles in capturing or buffering atmospheric deposition in forests with frequent gap disturbances,such as subalpine forests.We selected an expanded gap edge canopy and a closed canopy in a subalpine natural forest on the eastern Tibetan Plateau.The throughfall deposition and canopy exchange processes of common base cations(K^(+),Ca^(2+),Na^(+),and Mg^(2+))were continuously studied over two years.The results showed that the enrichment ratio and fluxes had lower levels of base cations in the gap-edge canopy than in the closed canopy,which indicated that base cations were concentrated more in the closed canopy than in the gap-edge canopy.Although Ca^(2+)in the gap-edge canopy showed a higher net throughfall flux,the annual net throughfall fluxes of K^(+),Na^(+) and Mg^(2+) within the gap-edge canopy were 1.83,6.75 and 2.95 times lower than those in the closed canopy,respectively.Moreover,dry deposition fluxes of base cations significantly decreased in the gap edge canopy compared to those in the closed canopy,and the decreasing tendency was more significant during the snowy season than during the rainy season.Overall,these results suggest that the amount of base cations in subalpine natural forest ecosystems may be overestimated when the throughfall deposition of ions in gap edge canopies is ignored.

关键词： Canopy exchange Dry deposition Throughfall Subalpine forest Precipitation deposition

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Increased microbial sequestration of soil organic carbon under nitrogen deposition over China’s terrestrial ecosystems

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Ecological Processes 2020年第1期9卷 602-614页

作者： Shu Liao Siyi Tan Yan Peng Dingyi Wang xiangyin ni Kai Yue Fuzhong Wu Yusheng Yang Key Laboratory for Humid Subtropical Eco-Geographical Processes of the Ministry of Education School of Geographical SciencesFujian Normal University8 Shangshan RdFuzhou 350007CangshanChina Department of Geosciences and Natural Resource Management University of CopenhagenRolighedsvej 23DK-1958 Frederiksberg CDenmark Center for Biodiversity Dynamics in a Changing Word(BIOCHANGE) Section for Ecoinformatics and BiodiversityDepartment of BiologyAarhus UniversityNy Munkegade 114DK-8000 Aarhus CDenmark

Background:China’s terrestrial ecosystems have been receiving increasing amounts of reactive nitrogen(N)over recent decades.External N inputs profoundly change microbially mediated soil carbon(C)dynamics,but how elevated N affects the soil organic C that is derived from microbial residues is not fully understood.Here,we evaluated the changes in soil microbial necromass C under N addition at 11 forest,grassland,and cropland sites over China’s terrestrial ecosystems through a meta-analysis based on available data from published articles.Results:Microbial necromass C accounted for an average of 49.5%of the total soil organic C across the studied sites,with higher values observed in croplands(53.0%)and lower values in forests(38.6%).Microbial necromass C was significantly increased by 9.5%after N addition,regardless of N forms,with greater stimulation observed for fungal(+11.2%)than bacterial(+4.5%)necromass C.This increase in microbial necromass C under elevated N was greater under longer experimental periods but showed little variation among different N application rates.The stimulation of soil microbial necromass C under elevated N was proportional to the change in soil organic C.Conclusions:The stimulation of microbial residues after biomass turnover is an important pathway for the observed increase in soil organic C under N deposition across China’s terrestrial ecosystems.

关键词： Microbial necromass carbon nitrogen deposition Amino sugars Soil organic carbon

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米槠和杉木人工林土壤酶活性和酶化学计量特征对凋落物输入的短期响应

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应用生态学报 2024年第3期35卷 631-638页

作者：艾灵吴福忠樊雪波杨静吴秋霞朱晶晶倪祥银福建师范大学地理科学学院、碳中和未来技术学院福州350117 福建师范大学湿润亚热带生态-地理过程教育部重点实验室福州350117 福建三明森林生态系统国家野外科学观测研究站福建三明365002

凋落物输入刺激土壤胞外酶的分泌,加快凋落物中碳(C)、氮(N)、磷(P)等养分释放,但不同基质质量凋落物输入如何调控土壤胞外酶活性和酶化学计量特征仍不清晰。本研究以亚热带10年生米槠和杉木人工林为研究对象,采用凋落物输入原位微宇宙... 详细信息

凋落物输入刺激土壤胞外酶的分泌,加快凋落物中碳(C)、氮(N)、磷(P)等养分释放,但不同基质质量凋落物输入如何调控土壤胞外酶活性和酶化学计量特征仍不清晰。本研究以亚热带10年生米槠和杉木人工林为研究对象,采用凋落物输入原位微宇宙试验,分析了2021年4—8月、10月和12月不同凋落物输入对β-葡萄糖苷酶、纤维二糖水解酶、β-N-乙酰氨基葡萄糖苷酶、亮氨酸氨基肽酶和酸性磷酸酶(AP)5种土壤胞外酶活性及其化学计量特征的影响。结果表明:1)与无凋落物输入相比,米槠人工林凋落物输入对土壤酶活性、酶化学计量和矢量特征均无显著影响;而杉木人工林凋落物输入使5月土壤AP活性显著提高1.7%,使8月酶化学计量碳氮比、10月酶化学计量碳磷比和氮磷比分别降低3.8%、11.7%和10.3%,使10月土壤酶向量角增加到53.8°,表明土壤微生物存在显著磷限制。2)偏最小二乘回归分析表明,土壤可溶性有机质和微生物生物量C、N分别是米槠和杉木人工林土壤胞外酶活性响应凋落物输入的主要影响因子。总体上,低质量(高C/N)的杉木凋落物输入在短期内更能刺激土壤胞外酶的分泌,加快凋落物分解,研究区域土壤微生物受到磷限制。

关键词：凋落物输入土壤胞外酶凋落物分解酶生态化学计量生物地球化学

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全球尺度上氮添加影响植物生物量分配但不影响不同器官间的异速生长关系

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Journal of Plant Ecology 2021年第3期14卷 361-371页

作者： Kai Yue Dario A.Fomara Wang Li xiangyin ni Yan Peng Shu Liao Siyi Tan Dingyi Wang Fuzhong Wu Yusheng Yang Key Laboratory for Humid Subtropical Eco-Geographical Processes of the Ministry of Education School of Geographical SciencesFujian Normal UniversityFuzhou 350007China Sustainable Agri-Food Science Division Agri-Food and Bioscience Institute(AFBI)BelfastUK State Key Laboratory of Remote Sensing Science Aerospace Information Research InstituteChinese Academy of SciencesBeijing 100101China Department of Geosciences and Natural Resource Management University of CopenhagenRolighcdsvej 23DK-1958 Frederiksberg CDenmark

生物量在不同器官间的分配是植物对环境变化响应的一个关键生态生理学过程。然而,在全球尺度上有关不同陆地生态系统植物生物量分配对氮沉降响应的认识还比较欠缺。本文通过整合分析333篇己发表文章的5474个观测值,基于“最优分配假说... 详细信息

生物量在不同器官间的分配是植物对环境变化响应的一个关键生态生理学过程。然而,在全球尺度上有关不同陆地生态系统植物生物量分配对氮沉降响应的认识还比较欠缺。本文通过整合分析333篇己发表文章的5474个观测值,基于“最优分配假说”和“异速分配假说”,评估了全球尺度上氮添加对植物生物量及其在不同器官间分配的影响。结果表明:(1)氮添加显著增加了整株植物或不同器官的生物量,降低了根冠比和根质量分数,但对叶质量分数和茎质量分数无显著影响;(2)氮添加对不同器官质量分数的影响受实验条件、植物功能性状、纬度、氮添加率等因子单独或交互作用的调控;(3)氮添加对生物量在不同器官间的异速分配率无显著影响,表明氮添加导致的根冠比和根质量分数减少是在异速分配模式下由整株植物生物量增加而致。虽然氮添加改变了地上和地下部分的质量分数,但不同器官生物量间异速分配模式的稳定性表明“异速分配假说”能更好地描述植物生物量分配对氮添加的响应规律。该研究结果将有助于深入认识氮沉降环境下植物生物量的分配规律,同时表明将生物量分配纳入有关氮沉降对陆地生态系统影响的预测模型中的重要性。

关键词：整合分析异速生长质量分数生态系统植物功能性状全球尺度

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森林土壤微生物生物量碳对凋落物输入的响应

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亚热带资源与环境学报 2024年第1期19卷 16-23页

作者：樊雪波吴福忠艾灵张玉岳楷吴秋霞朱晶晶倪祥银福建师范大学地理科学学院、碳中和未来技术学院福州350117 福建师范大学湿润亚热带生态-地理过程教育部重点实验室福州350117 福建三明森林生态系统国家野外科学观测研究站福建三明365002

微生物生物量碳(MBC)是土壤碳循环中最活跃、最敏感的碳组分之一。凋落物输入为土壤微生物提供了大量新鲜的碳源,是森林生物地球化学循环的重要载体。不同类型森林的地表凋落物种类和数量不同,凋落物化学组成不同,可能直接影响土壤MBC... 详细信息

微生物生物量碳(MBC)是土壤碳循环中最活跃、最敏感的碳组分之一。凋落物输入为土壤微生物提供了大量新鲜的碳源,是森林生物地球化学循环的重要载体。不同类型森林的地表凋落物种类和数量不同,凋落物化学组成不同,可能直接影响土壤MBC含量。因此,评估不同类型森林中凋落物添加和去除后土壤MBC响应的变化,对于认识森林土壤生物地球化学过程具有重要意义。本研究利用国内外已发表的74篇研究论文中630组配对数据,从凋落物类型、森林类型、实验时间等方面揭示凋落物添加和去除对土壤MBC的影响。结果表明:不同凋落物类型对MBC的影响不同,添加凋落叶使土壤MBC响应增加了14.4%,而去除凋落叶、根及同时去除凋落叶和根使土壤MBC响应分别降低了5.9%、12.1%、13.5%,去除根对土壤MBC的影响是去除凋落叶的2.1倍。不同森林类型显著影响土壤MBC对凋落物输入的响应,添加凋落物使人工林(22.8%)的土壤MBC响应高于天然林(8.9%),阔叶林的土壤MBC响应高于针叶林。凋落物输入后土壤MBC的响应在实验第一年迅速增加(15.8%),但这种响应随时间的延长逐渐降低,而去除凋落物后,土壤MBC响应随实验时间的延长迅速下降。这些结果表明,凋落物输入是土壤MBC的重要来源,其中根凋落物的贡献约是凋落叶的2.1倍,且土壤MBC对高质量的凋落物输入更加敏感,这对深入认识森林生物地球化学过程具有重要意义。

关键词：凋落物输入凋落物去除微生物生物量碳

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Recent progress in MnBi2nTe3n+1 intrinsic magnetic topological insulators: crystal growth, magnetism and chemical disorder

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National Science Review 2024年第2期11卷 65-80页

作者： Chaowei Hu Tiema Qian ni ni Department of Physics and Astronomy and California Nano Systems Institute University of California-Los Angeles

The search for magnetic topological materials has been at the forefront of condensed matter research for their potential to host exotic states such as axion insulators, magnetic Weyl semimetals, Chern insulators,etc. To date, the MnBi2nTe3n+1family is the only group of materials showcasing van der Waals-layered structures, intrinsic magnetism and non-trivial band topology without trivial bands at the Fermi level. The interplay between magnetism and band topology in this family has led to the proposal of various topological phenomena, including the quantum anomalous Hall effect, quantum spin Hall effect and quantum magnetoelectric effect. Among these, the quantum anomalous Hall effect has been experimentally observed at record-high temperatures, highlighting the unprecedented potential of this family of materials in fundamental science and technological innovation. In this paper, we provide a comprehensive review of the research progress in this intrinsic magnetic topological insulator family, with a focus on single-crystal growth, characterization of chemical disorder, manipulation of magnetism through chemical substitution and external pressure, and important questions that remain to be conclusively answered.

关键词： MnBi2Te4 magnetic topological insulator magnetism tuning antiferromagnetism ferromagnetism pressure chemical doping

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