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Intensive management enhances mycorrhizal respiration but decreases free-living microbial respiration by affecting microbial abundance and community structure in Moso bamboo forest soils

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Pedosphere 2024年第2期34卷 508-519页

作者： wenhao jin Jiangfei GE Shuai SHAO Liyuan PENG Jiajia XING Chenfei LIANG Junhui CHEN Qiufang XU Hua QIN State Key Laboratory of Subtropical Silviculture Zhejiang A&F UniversityHangzhou 311300China School of Environmental and Resource Sciences Zhejiang A&F UniversityHangzhou 311300China

Intensive management is known to markedly alter soil carbon(C)storage and turnover in Moso bamboo forests compared with extensive ***,the effects of intensive management on soil respiration(RS)components remain *** study aimed to evaluate the changes in different RScomponents(root,mycorrhizal,and free-living microorganism respiration)in Moso bamboo forests under extensive and intensive management practices.A1-year in-situ microcosm experiment was conducted to quantify the RScomponents in Moso bamboo forests under the two management practices using mesh screens of varying *** results showed that the total RSand its components exhibited similar seasonal variability between the two management *** with extensive management,intensive management significantly increased cumulative respiration from mycorrhizal fungi by 36.73%,while decreased cumulative respiration from free-living soil microorganisms by 8.97%.Moreover,the abundance of arbuscular mycorrhizal fungi(AMF)increased by 43.38%,but bacterial and fungal abundances decreased by 21.65%and 33.30%,respectively,under intensive *** management practices significantly changed the bacterial community composition,which could be mainly explained by soil pH and available *** fungi and intensive management affected the interrelationships between bacterial *** equation modeling indicated that intensive management changed the cumulative RSby elevating AMF abundance and lowering bacterial *** concluded that intensive management reduced the microbial respiration-derived C loss,but increased mycorrhizal respiration-derived C loss.

关键词： arbuscular mycorrhizal fungi extensive management microbial co-occurrence network root respiration soil organic C soil respiration structural equation model

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平面叶栅风洞流场品质的被动调控策略

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航空动力学报 2024年第7期39卷 217-228页

作者：蔡明高丽敏晋文浩雷祥福西北工业大学动力与能源学院西安710129 西北工业大学翼型、叶栅空气动力学国家级重点实验室西安710129

为了提升高负荷叶型的平面叶栅试验流场品质以保证试验数据的可靠性和准确性,建立了平面叶栅流场品质的评价参数,提出了中间流线型上端壁及其与出口可调尾板组合的两种被动调控方案.采用试验验证的数值模拟方法研究了以上两种方案对高... 详细信息

为了提升高负荷叶型的平面叶栅试验流场品质以保证试验数据的可靠性和准确性,建立了平面叶栅流场品质的评价参数,提出了中间流线型上端壁及其与出口可调尾板组合的两种被动调控方案.采用试验验证的数值模拟方法研究了以上两种方案对高负荷平面叶栅流场品质的调控策略.结果表明:两种调控方案均能够有效抑制上端壁区域的流场恶化,进而提升平面叶栅的来流准确性、流场周期性以及二维性.采用与平面叶栅理想中间流线相匹配的上端壁安装角和周向距离,以及尾板安装角时,两种方案对流场品质的提升效果最好.中间流线型上端壁组合出口尾板方案优于中间流线型上端壁方案,使叶栅中间3个叶片通道的进口马赫数偏差不超过±0.005,来流攻角偏差不超过±0.3°;叶栅进口和出口马赫数的周期性偏差不超过0.005,气流角的周期性偏差不超过0.3°;设计攻角下叶栅轴向速度密度比(AVDR)达到1.1,叶栅二维性较好.两种调控方案对叶栅大攻角工况的流场品质调节具有很好的适用性.

关键词：平面叶栅试验端壁改型尾板流场品质准确性周期性

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计及荷电状态的混合储能系统容量优化配置

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河北电力技术 2024年第3期43卷 21-26页

作者：靳雯皓吴倩国网山东省电力公司济宁供电公司山东济宁272000

为平抑风电输出功率波动,降低对电力系统造成的冲击,提出一种计及荷电状态的混合储能系统容量优化配置策略。采取滑动平均控制的方法抑制功率波动性,运用频谱分析将风力发电波动部分转化为高、低频波动控制量,由混合储能系统按频段分别... 详细信息

为平抑风电输出功率波动,降低对电力系统造成的冲击,提出一种计及荷电状态的混合储能系统容量优化配置策略。采取滑动平均控制的方法抑制功率波动性,运用频谱分析将风力发电波动部分转化为高、低频波动控制量,由混合储能系统按频段分别平抑控制,构建基于储能系统不同荷电状态区间的充、放电功率优化控制策略,以年平均成本最优为目标函数建立了计及蓄电池循环使用周期的成本模型。仿真结果表明,所提方法可实现功率波动的平滑控制,实现混合储能系统功率优化分配,使荷电状态保持在合理范围内,避免发生过充和过放,具有可行性以及经济优越性。

关键词：混合储能容量优化配置超级电容器蓄电池滑动平均控制频谱分析过充过放

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法律体系视角下清代藩部治理结构新论

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克拉玛依学刊 2024年第1期14卷 50-60页

作者：田庆锋金文浩西北师范大学法学院甘肃兰州730070 兰州大学法学院甘肃兰州730000

法律体系是在特定时空下不同领域中有效的各种类型的静态的法律规范体系与动态的法治体系、与时俱进的制度和卓有成效的法律实践所构成的一个有机整体,具有逻辑严密、结构完整、实效性、历时性等特征,既可横向分为不同的部门法和领域法... 详细信息

法律体系是在特定时空下不同领域中有效的各种类型的静态的法律规范体系与动态的法治体系、与时俱进的制度和卓有成效的法律实践所构成的一个有机整体,具有逻辑严密、结构完整、实效性、历时性等特征,既可横向分为不同的部门法和领域法,也可纵向分为中央法与地方法。清代藩部治理体系包括法源体系、行政和司法治理体系,是当时中国法律体系的重要组成部分,其内在结构呈现出一体二级多元化特征,从不同角度可以分为中央法与地方法、驻扎大臣与地方官员、地方司法与中央司法、自治与共治等多个单元。这种复合型的结构维系着藩部地方国家的政治安全和文化认同。

关键词：法律体系清代藩部治理体系治理结构

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林分改变驱动的优势菌根真菌类型变化影响土壤有机碳积累

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土壤学报 2024年第1期61卷 223-234页

作者：屠嘉莹金文豪盛卫星邢佳佳彭丽媛陈俊辉徐秋芳秦华浙江农林大学省部共建亚热带森林培育国家重点实验室浙江农林大学环境与资源学院杭州311300 浙江省建德市林业局浙江建德311600

马尾松林(PinusmassonianaLamb.)是典型的外生菌根(Ectomycorrhiza,ECM)优势林,但是近年来受到松材线虫病的影响,生态服务功能下降,逐渐被丛枝菌根(Arbuscularmycorrhiza,AM)占优势的阔叶林所替代,但亚热带地区马尾松林转变为阔叶林过程... 详细信息

马尾松林(PinusmassonianaLamb.)是典型的外生菌根(Ectomycorrhiza,ECM)优势林,但是近年来受到松材线虫病的影响,生态服务功能下降,逐渐被丛枝菌根(Arbuscularmycorrhiza,AM)占优势的阔叶林所替代,但亚热带地区马尾松林转变为阔叶林过程中,优势菌根类型的改变对土壤有机碳积累的影响仍不清楚。以建德市马尾松林和阔叶林为研究对象,通过高效液相色谱和中性脂肪酸、磷脂脂肪酸等技术,测定优势菌根真菌生物量、球囊霉素相关土壤蛋白(GRSP)含量以及土壤胞外酶活性和微生物群落特征。结果表明:AM真菌占优势的阔叶林(AMD)取代ECM真菌占优势的马尾松林(ECMD),土壤有机碳显著提高了36.81%,微生物碳利用效率(CUE)显著提高了53.85%,AM真菌生物量提高了25.57%,ECM真菌生物量下降45.04%,并且ECM真菌占优势的马尾松林受到更严重的氮限制。磷脂脂肪酸分析显示,相比于AM真菌占优势的阔叶林,ECM真菌占优势的马尾松林革兰氏阳性细菌(G^(+))以及革兰氏阳性与阴性细菌之比(G^(+)/G^(–))分别显著下降了21.47%和6.46%。冗余分析(Redundancy analysis,RDA)结果表明,AM真菌占优势和ECM真菌占优势的森林之间土壤微生物群落结构存在显著差异(P<0.05),其中AM真菌生物量和土壤有机碳与微生物群落结构变异显著相关。GRSP含量下降以及不同类型菌根真菌招募微生物类群不同是导致ECM真菌占优势森林土壤有机碳下降的重要原因。因此,亚热带地区马尾松林被阔叶林替代后增加森林土壤有机碳含量,提高森林碳汇功能。

关键词：丛枝菌根真菌外生菌根真菌有机碳磷脂脂肪酸麦角固醇微生物策略

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Moso bamboo expansion decreased soil heterotrophic respiration but increased arbuscular mycorrhizal mycelial respiration in a subtropical broadleaved forest

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Forest Ecosystems 2023年第3期10卷 337-347页

作者： wenhao jin Jiaying Tu Qifeng Wu Liyuan Peng Jiajia Xing Chenfei Liang Shuai Shao Junhui Chen Qiufang Xu Hua Qin The State Key Laboratory of Subtropical Silviculture Zhejiang A&F UniversityLin'anHangzhou311300China College of Environmental and Resource Sciences Zhejiang A&F UniversityLin'anHangzhou311300China Agricultural Technology Extension Centre Lin'an Municipal Bureau of AgricultureLin'anHangzhou311300China

Moso bamboo(Phyllostachys Pubescens)expansion into adjacent forests has been widely reported to affect plant diversity and its association with mycorrhizal fungi in subtropical China,which will likely have significant impacts on soil ***,there is still limited information on how Moso bamboo expansion changes soil respiration components and their linkage with microbial community composition and *** on a mesh exclusion method,soil respirations derived from roots,arbuscular mycorrhizal(AM)mycelium,and free-living microbes were investigated in a pure Moso bamboo forest(expanded),an adjacent broadleaved forest(nonexpanded),and a mixed bamboo-broadleaved forest(expanding).Our results showed that bamboo expansion decreased the cumulative CO_(2)effluxes from total soil respiration,root respiration and soil heterotrophic respiration(by 19.01%,30.34%,and 29.92%on average),whereas increased those from AM mycelium(by 78.67%in comparison with the broadleaved forests).Bamboo expansion significantly decreased soil organic carbon(C)content,bacterial and fungal abundances,and enzyme activities involved in C,N and P cycling whereas enhanced the interactive relationships among bacterial *** contrast,the ingrowth of AM mycelium increased the activities ofβ-glucosidase and N-acetyl-β-glucosaminidase and decreased the interactive relationships among bacterial *** in soil heterotrophic respiration and AM mycelium respiration had positive correlations with soil enzyme activities and fungal *** summary,our findings suggest that bamboo expansion decreased soil heterotrophic respiration by decreasing soil microbial activity but increased the contribution of AM mycelial respiration to soil C efflux,which may potentially increase soil C loss from AM mycelial pathway.

关键词： Bamboo expansion Soil respiration Soil organic carbon Plant C allocation Arbuscular mycorrhizal fungi

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Research of Multi-Rate LDPC Decoding in Optical Communication System

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Optics and Photonics Journal 2020年第6期10卷 174-181页

作者： wenhao jin Chunwu Liu College of Artificial Intelligence National University of Defense Technology Changsha China

Low-density parity-check code (LDPC) not only has good performance approaching the Shannon limit, but also has low decoding complexity and flexible structure. It is a research hot-spot in the field of channel coding in recent years and has a wide range of application prospects in optical communication systems. In this paper, the decoding aspects and performance of LDPC codes are analyzed and compared according to the bit error rate (BER) of LDPC codes. The computer simulation was carried out under additive white Gaussian noise (AWGN) channel and binary phase shift keying (BPSK) modulation. Through theoretical analysis and simulation results, this paper explores the way of multi-rate LDPC decoding.

关键词： LDPC Multi-Rate Decoding Simulation

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Epigenetic control on transcription of vernalization genes and whole-genome gene expression profile induced by vernalization in common wheat

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Plant Diversity 2024年第3期46卷 386-394页

作者： Yunzhen Li Liujie jin Xinyu Liu Chao He Siteng Bi Sulaiman Saeed wenhao Yan National Key Laboratory of Crop Genetic Improvement Hubei Hongshan LaboratoryHuazhong Agricultural UniversityWuhan 430070China

Vernalization is necessary for winter wheat to ***,it is unclear whether vernalization is also required for spring wheat,which is frequently sown in fall,and what molecular mechanisms underlie the vernalization response in wheat *** this study,we examined the molecular mechanisms that regulate vernalization response in winter and spring wheat *** this purpose,we determined how major vernalization genes(VRN1,VRN2,and VRN3)respond to vernalization in these varieties and whether modifications to histones play a role in changes in gene *** also identified genes that are differentially regulated in response to vernalization in winter and spring wheat *** found that in winter wheat,but not in spring wheat,VRN1 expression decreases when returned to warm temperature following *** finding may be associated with differences between spring and winter wheat in the levels of tri-methylation of lysine 27 on histone H3(H3K27me3)and tri-methylation of lysine 4 on histone H3(H3K4me3)at the VRN1 *** of winter wheat transcriptomes before and after vernalization revealed that vernalization influences the expression of several genes,including those involved in leucine catabolism,cysteine biosynthesis,and flavonoid *** findings provide new candidates for further study on the mechanism of vernalization regulation in wheat.

关键词： Wheat Vernalization VRN1 Histone modification Regulate network

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Homovalent doping: An efficient strategy of the enhanced TiNb2O7 anode for lithium-ion batteries

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Green Energy & Environment 2024年第8期9卷 1257-1266页

作者： Xiaohe jin Yirui Deng Han Tian Miaomiao Zhou wenhao Tang Huiyou Dong Xinquan Zhang Ruiping Liu Department of Materials Science and Engineering China University of Mining & Technology (Beijing) Department of Materials Science and Engineering China University of Mining&Technology (Beijing)

The low energy density,unsatisfied cycling performance,potential safety issue and slow charging kinetics of the commercial lithium-ion batteries restrained their further application in the fields of fast charging and long-haul electric *** TiNb2O7（TNO） with the theoretical capacity of 387 mAh g-1has been proposed as a high-capacity anode materials to replace *** this work,homovalent doping strategy was used to enhance the electrochemical performance of Ti Nb2O7（TNO） by employing Zr to partial substitute Ti through solvothermal *** doping of Zr4+ions can enlarge the lattice structure without changing the chemical valence of the original elements,refine and homogenize the grains,improve the electrical conductivity,and accelerate the ion diffusion kinetics,and finally enhance the cycle and rate ***,Z0.05-TNO shows initial discharge capacity of as high as 312.2 mAh g-1at 1 C and 244.8 mAh g-1at 10 C,and still maintains a high specific capacity of 171.3 mAh g-1after 800 cycles at 10 *** study provides a new strategy for high-performance fastcharging energy storage electrodes.

关键词： Homovalent doping Zr 4+ TiNb 2 O 7 Microsphere Lithium-ion batteries

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Transition Metal/Lanthanide-Nitrogen Double Bonds Co-stabilized in a Carbon Cage

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Precision Chemistry 2024年第5期2卷 193-199页

作者： Zhanxin Jiang Ziqi Hu Yang-Rong Yao wenhao Xiang Xinyi Han jinpeng Xin Huaimin jin Shangfeng Yang Key Laboratory of Precision and Intelligent Chemistry Collaborative Innovation Center of Chemistry for Energy Materials(iChEM)Department of Materials Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026China

Metal−nitrogen double bonds have been commonly reported for conventional metal complexes,but the coexistence of both transition metal−nitrogen and lanthanide−nitrogen double bonds bridged by nitrogen within one compound has never been ***,by encapsulating a ternary transition metallanthanide heteronuclear dimetallic nitride into a C_(84) fullerene cage,transition metal−nitrogen and lanthanide-nitrogen double bonds are costabilized simultaneously within the as-formed clusterfullerene TiCeN@C_(1)(12)-C_(84),which is a representative heteronuclear dimetallic nitride *** molecular structure was unambiguously determined by single-crystal X-ray diffraction,revealing a slightly bentμ2-bridged nitride cluster with short Ti−N(1.761Å)and Ce−N(2.109Å)bond lengths,which are comparable to the corresponding Ti=N and Ce=N double bonds of reported metal complexes and consistent with the theoretically predicted values,confirming their coexistence within TiCeN@C_(1)(12)-C_(84).Density functional theory(DFT)calculations unveil three-center two-electron(3c-2e)bonds delocalized over the entire TiCeN cluster,which are responsible for costabilization of Ti�N and Ce�N double *** electronic configuration of Ti4+Ce^(3+)N^(3−)@C_(84)^(4−)is proposed featuring an intramolecular four-electron transfer,drastically different from the analogous actinide dimetallic nitride clusterfullerene(U_(2))^(9+)N^(3−)@C_(80)^(6−)and trimetallic nitride clusterfullerene(Sc_(2))^(6+)Ti^(3+)^(N3−)@C_(80)^(6−),indicating the peculiarity of 4-fold negatively charged fullerene cage in stabilizing the heteronuclear dimetallic nitride cluster.

关键词： Fullerene metallofullerene transitionmetal lanthanide metal−nitrogen multiplebond

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