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Stable carbon isotope composition and intrinsic water use efficiency in plants along an altitudinal gradient on the eastern slope of Yulong Snow Mountain, China

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Ecological Processes 2024年第2期13卷 218-230页

作者： Feng Jiang Tao Pu Zi-Jing Xue Yan-Wei Ma xiao-Yi shi fu-xi shi College of Geography and Environmental Sciences Zhejiang Normal University Yulong Snow Mountain Glacier and Environment Observation and Research Station/State Key Laboratory of Cryospheric Sciences Northwest Institute of Eco-Environment and ResourcesChinese Academy of Sciences Key Laboratory of National Forestry and Grassland Administration on Forest Ecosystem Protection and Restoration of Poyang Lake Watershed College of Forestry Jiangxi Agricultural University

Background Stable carbon isotope composition(δ13Cp) can be used to estimate the changes in intrinsic water use efficiency（iWUE） in plants,which helps us to better understand plants' response strategies to climate *** study focused on the variations in δ13Cpand iWUE for the different life-form plants（i.e.,herbs,shrubs,and trees）along an altitudinal gradient（3300,3600,3900,4100,4300,and 4500 m） on the eastern slope of Yulong Snow Mountain,southeastern margin of the Qinghai-Tibet *** response mechanisms of δ13Cpand iWUE for different life-form plants to altitude were thoroughly analyzed in this mountain *** The δ13Cpvalues of plants on the eastern slopes of Yulong Snow Mountain ranged from-30.4‰to-26.55‰,with a mean of-28.02‰,indicating a dominance of *** δ13Cpand iWUE values varied among different life-form plants in the order of herbs> shrubs> trees,particularly in 3600,3900,and 4300 ***δ13Cpand iWUE values for herbs and shrubs increased with altitude and were mainly controlled by air *** two parameters for trees exhibited a trend of initial decrease followed by an increase with *** 3900 m,the δ13Cpand iWUE values decreased with altitude,influenced by soil ***,above 3900 m,the two parameters increased with altitude,mainly regulated by air *** addition,iWUE was positively correlated with leaf P content but negatively correlated with leaf N:P ratio,especially for herbs and trees,suggesting that P plays a key role in modulating iWUE in this *** The diffe rentiated responses of water availability for different life-form plants to a higher altitudinal gradient are regulated by air temperature,soil moisture,and leaf P content in the Yulong Snow *** results provide valuable insights into understanding the wate r-carbon relationships in high-altitude ecosystems.

关键词： Stable carbon isotope Water use efficiency Altitude Life form Yulong Snow Mountain

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Effect of shrub encroachment on leaf nutrient resorption in temperate wetlands in the Sanjiang Plain of Northeast China

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Ecological Processes 2022年第1期11卷 968-975页

作者： Le‑Lin Yu xin‑Hou Zhang fu‑xi shi Rong Mao Key Laboratory of National Forestry and Grassland Administration on Forest Ecosystem Protection and Restoration of Poyang Lake Watershed College of ForestryJiangxi Agricultural UniversityNo.1101 Zhimin RoadNanchang 330045China Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and AgroecologyChinese Academy of SciencesChangchun 130102China School of Environment Nanjing Normal UniversityNanjing 210046China

Background:Nutrient resorption is an important plant nutrient conservation strategy in ***,how shrub encroachment alters plant nutrient resorption processes is unclear in temperate ***,we collected green and senesced leaves of common sedge,grass,and shrub species in wetlands with high(50–65%)and low(20–35%)shrub covers in the Sanjiang Plain of Northeast China,and assessed the impact of shrub encroachment on leaf nitrogen(N)and phosphorus(P)resorption efficiency and proficiency at both plant growth form and community ***:The effects of shrub cover on leaf nutrient resorption efficiency and proficiency were identical among shrubs,grasses,and *** of plant growth forms,increased shrub cover reduced leaf N resorption efficiency and proficiency,but did not alter leaf P resorption efficiency and ***,the effect of shrub cover on leaf nutrient resorption efficiency and proficiency differed between plant growth form and community *** the community level,leaf N and P resorption efficiency decreased with increasing shrub cover because of increased dominance of shrubs with lower leaf nutrient resorption efficiency over grasses and ***,community‑level senesced leaf N and P concentrations increased with elevating shrub cover,showing a decline in leaf N and P resorption ***,the significant relationships between leaf nutrient resorption efficiency and proficiency indicate that shrub encroachment increased senesced leaf nutrient concentrations by decreasing nutrient resorption ***:These observations suggest that shrub encroachment reduces community‑level leaf nutrient resorp‑tion efficiency and proficiency and highlight that the effect of altered plant composition on leaf nutrient resorption should be assessed at the community level in temperate wetlands.

关键词： Biodiversity Freshwater marsh Nutrient conservation strategy Plant growth form Species composition

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Biomass allocation between leaf and stem regulates community-level plant nutrient resorption efficiency response to nitrogen and phosphorus additions in a temperate wetland of Northeast China

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Journal of Plant Ecology 2021年第1期14卷 58-66页

作者： Yun Zhang Gui-Sheng Yang fu-xi shiu Rong Mao Key Laboratory of National Forestry Administration on Forest Ecosystem Protection and Restoration of Poyang Lake Watershed College of ForestryJiangxi Agricullural UniversityNanchang 330045China Wuyishanxipo Observation and Research Station of Forest Ecosystem Zixi 335300China Environment and Plant Protection Institute Chinese Academy of Tropical Agricultural ScienceHaikou 571101China

Aims Nutrient resorption is a crucial component of plant nutrient use strategy,yet the controls on the responses of community-level nutrient resorption to altered nutrient availability remain ***,we addressed two questions:(1)Did leaf and stem nutrient resorption respond consistently to increased nutrient availability?(2)Was community-level plant nutrient resorption response after nutrient enrichment driven by the intraspecific plasticity in plant nutrient resorption or by altered species composition?Methods We investigated the changes in aboveground biomass,and leaf and stem nutrient resorption of individual species after 3-year nitrogen(N)and phosphorus(P)additions,and assessed community-level nutrient resorption response to 3-year nutrient additions in a graminoid-dominated temperate wetland,Northeast *** Findings For both leaves and stems,N and P additions did not affect nutrient resorption efficiency,but they decreased respective nutrient resorption ***,community-level N and P resorption proficiency declined with respective nutrient ***-level N and P resorption efficiency was reduced by N addition primarily due to altered community composition and declined leaf:stem *** results suggest that leaf and stem nutrient resorption processes exhibit consistent responses to increasing nutrient availability in the temperate *** findings highlight the importance of altered species composition and biomass allocation between leaf and stem in driving community-level nutrient resorption response to nutrient enrichment.

关键词： leaf:stem ratio nutrient enrichment nutrient resorption proficiency nutrient use strategy species composition

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输电线路大截面Z型导线架线常见问题处理

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能源与节能 2014年第4期 25-27页

作者：付诗禧南方电网超高压输电公司广东广州510620

结合溪洛渡右岸电站送电广东工程,从放线施工主要设备选择、施线常见问题处理及导线架线注意事项三个方面对大截面Z型导线架线技术进行探讨分析。

关键词：大截面导线架线施工设备压接

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CD-R光盘盘基槽深和槽宽均匀性测试方法研究

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中国激光 2001年第11期28卷 994-998页

作者：徐文东干福熹施宏仁何红林强中国科学院上海光机所上海201800

介绍了一种利用衍射方法测试CD R光盘盘基槽深和槽宽均匀性的方法。CD R光盘盘基槽深和槽宽均匀性的测试对于CD R光盘的制造非常重要 ,它可反映出母盘涂胶、刻录、显影、金属化、电铸及盘基复制的质量。尽管它不能精确测试沟槽的形状 ,... 详细信息

介绍了一种利用衍射方法测试CD R光盘盘基槽深和槽宽均匀性的方法。CD R光盘盘基槽深和槽宽均匀性的测试对于CD R光盘的制造非常重要 ,它可反映出母盘涂胶、刻录、显影、金属化、电铸及盘基复制的质量。尽管它不能精确测试沟槽的形状 ,但在测试均匀性时却显得简单、可靠、灵敏、快速和无损。

关键词： CD-R光盘盘基光栅衍射槽深槽宽测试

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Tranylcypromine upregulates Sestrin 2 expression to ameliorate NLRP3-related noise-induced hearing loss

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Neural Regeneration Research 2025年第5期20卷 1483-1494页

作者： xihang Chen Zhifeng Chen Menghua Li Weiwei Guo Shuolong Yuan Liangwei Xu Chang Lin xi shi Wei Chen shiming Yang Senior Department of Otolaryngology Head and Neck Surgery Chinese PLA General HospitalChinese PLA Medical SchoolBeijingChina State Key Laboratory of Hearing and Balance Science BeijingChina National Clinical Research Center for Otolaryngologic Diseases BeijingChina Key Laboratory of Hearing Science Ministry of EducationBeijingChina Beijing Key Laboratory of Hearing Impairment Prevention and Treatment BeijingChina Department of Otorhinolaryngology Head and Neck Surgery The First Affiliated Hospital of Fujian Medical UniversityFuzhouFujian ProvinceChina Department of Otolaryngology Head and Neck Surgery The 940th Hospital of Joint Logistics Support Force of Chinese PLALanzhouGansu ProvinceChina Key Laboratory of Tropical Biological Resources of Ministry of Education School of Pharmaceutical SciencesHainan UniversityHaikouHainan ProvinceChina Academician Workstation of Hainan University School of Pharmaceutical SciencesYazhou BaySanyaHainan ProvinceChina

Noise-induced hearing loss is the primary non-genetic factor contributing to auditory ***,there are currently no effective pharmacological interventions for patients with noise-induced hearing ***,we present evidence suggesting that the lysine-specific demethylase 1 inhibitor–tranylcypromine is an otoprotective agent that could be used to treat noise-induced hearing loss,and elucidate its underlying regulatory *** established a mouse model of permanent threshold shift hearing loss by exposing the mice to white broadband noise at a sound pressure level of 120 d B for 4 *** found that tranylcypromine treatment led to the upregulation of Sestrin2(SESN2)and activation of the autophagy markers light chain 3B and lysosome-associated membrane glycoprotein 1 in the cochleae of mice treated with *** noise exposure group treated with tranylcypromine showed significantly lower average auditory brainstem response hearing thresholds at click,4,8,and 16 k Hz frequencies compared with the noise exposure group treated with *** findings indicate that tranylcypromine treatment resulted in increased SESN2,light chain 3B,and lysosome-associated membrane glycoprotein 1 expression after noise exposure,leading to a reduction in levels of 4-hydroxynonenal and cleaved caspase-3,thereby reducing noise-induced hair cell ***,immunoblot analysis demonstrated that treatment with tranylcypromine upregulated SESN2 expression via the autophagy *** treatment also reduced the production of NOD-like receptor family pyrin domaincontaining 3(NLRP3)*** conclusion,our results showed that tranylcypromine treatment ameliorated cochlear inflammation by promoting the expression of SESN2,which induced autophagy,thereby restricting NLRP3-related inflammasome signaling,alleviating cochlear hair cell loss,and protecting hearing *** findings suggest that inhibiting lysine-specific demethylase 1 is a

关键词： 4-hydroxynonenal apoptosis autophagy cleaved caspase-3 inflammation NOD-like receptor family pyrin domain-containing 3(NLRP3) noise-induced hearing loss oxidative stress Sestrin2 tranylcypromine

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基于HFC网络的VBR视频流传输

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通信学报 2001年第3期22卷 33-39页

作者：傅锡天施可为孙景鳌蔡安妮北京邮电大学北京100876

本文讨论了基于HFC网络的变比特率 (VBR)视频流的传输问题 ,提出了一种在共享信道上的协作型传输方案 ;分别利用了中心极限定理和直方图卷积的方法 ;给出了两种接纳控制算法 ,通过仿真实验表明了这种方案比传统的无缓冲复用方案在带宽... 详细信息

本文讨论了基于HFC网络的变比特率 (VBR)视频流的传输问题 ,提出了一种在共享信道上的协作型传输方案 ;分别利用了中心极限定理和直方图卷积的方法 ;给出了两种接纳控制算法 ,通过仿真实验表明了这种方案比传统的无缓冲复用方案在带宽利用率上提高了约 2 5% ,同时验证了两种接纳控制算法。

关键词： VBR 视频流 HFC网传输通信网接入网

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软质聚氯乙烯电缆材料的抗老化与耐腐蚀性能研究

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塑料科技 2023年第5期51卷 62-65页

作者：付诗禧陈志辉彭玉培甘宗跃郝德娜中国南方电网超高压输电公司广东广州510620

在聚氯乙烯(PVC)中添加紫外吸收剂,对其表面进行等离子刻蚀,制备PVC复合电缆材料(FPVC/UV)。结果表明:FPVC/UV-3具有最佳的力学性能,拉伸强度以及冲击强度分别为57.6 MPa和4.13 kJ/m2,表现出最佳的抗老化性能。在抗腐蚀测试中,FPVC/UV-3... 详细信息

在聚氯乙烯(PVC)中添加紫外吸收剂,对其表面进行等离子刻蚀,制备PVC复合电缆材料(FPVC/UV)。结果表明:FPVC/UV-3具有最佳的力学性能,拉伸强度以及冲击强度分别为57.6 MPa和4.13 kJ/m2,表现出最佳的抗老化性能。在抗腐蚀测试中,FPVC/UV-3在10 h腐蚀老化后表现出最佳的性能,质量损失率仅为6.9%,拉伸强度和冲击强度下降率分别为15.4%和11.6%,优于其他材料。FPVC/UV-3表现出优异的耐久性,在60 h腐蚀老化测试下,质量损失率仅为14.23%,具有较强的适用性。

关键词：聚氯乙烯抗老化抗腐蚀拉伸强度冲击强度

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Hardware-in-loop adaptive neural control for a tiltable V-tail morphing aircraft

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Defence Technology（防务技术） 2023年第4期22卷 197-211页

作者： fu-xiang Qiao Jing-ping shi xiao-bo Qu Yong-xi Lyu School of Automation Northwestern Polytechnical UniversityXi'an710129China Shaanxi Province Key Laboratory of Flight Control and Simulation Technology Xi'an710129China

This paper proposes an adaptive neural control(ANC)method for the coupled nonlinear model of a novel type of embedded surface morphing aircraft which has a tiltable V-tail.A nonlinear model with sixdegrees-of-freedom is *** first-order sliding mode differentiator(FSMD)is applied to the control scheme to avoid the problem of“differential explosion”.Radial basis function neural networks are introduced to estimate the uncertainty and external disturbance of the model,and an ANC controller is proposed based on this design *** stability of the proposed ANC controller is proved using Lyapunov theory,and the tracking error of the closed-loop system is semi-globally uniformly *** effectiveness and robustness of the proposed method are verified by numerical simulations and hardware-in-the-loop(HIL)simulations.

关键词： Morphing aircraft Back-stepping control Adaptive control Neural networks Radial basis function

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基于点云语义分割的猕猴桃冠层叶密度测量方法

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农机化研究 2025年第2期47卷 27-35页

作者：韩皓名石复习席新明西北农林科技大学机械与电子工程学院陕西杨凌712100

提出了一种基于LiDAR的猕猴桃果园叶密度测量方法,旨在为猕猴桃果园冠层喷药提供更精确的指导。首先,使用激光雷达扫描10个密度不同的猕猴桃冠层建立点云数据集,利用RandLA-Net神经网络模型并通过6折交叉验证的方法对猕猴桃冠层的树叶... 详细信息

提出了一种基于LiDAR的猕猴桃果园叶密度测量方法,旨在为猕猴桃果园冠层喷药提供更精确的指导。首先,使用激光雷达扫描10个密度不同的猕猴桃冠层建立点云数据集,利用RandLA-Net神经网络模型并通过6折交叉验证的方法对猕猴桃冠层的树叶、树枝和T型架点云进行语义分割;然后,计算仅包含树叶信息的冠层点云表面积,通过与人工落叶后的实测冠层叶属性(叶面积、叶片数)进行回归分析比较,得到冠层叶点云表面积与真实冠层叶属性的关系;最后,将3 m×3 m的猕猴桃冠层区域划分为400个225 cm^(2)的小网格区域,用以生成冠层叶密度图。结果表明:RandLA-Net网络模型能够有效地对猕猴桃冠层的树枝、树叶与T型架点云进行分割,模型平均总体精度OA达到92%以上,平均交并比mIoU为81.4%,冠层实测叶面积与冠层叶点云表面积的回归分析中获得了较高的相关性R=0.78,回归方程为y=1.491x+8315。对于每个猕猴桃冠层点云数据,通过Alpha-shape算法计算网格区域的冠层体积和预测网格真实叶面积的方法生成冠层叶密度图。所开发的基于点云语义分割的猕猴桃冠层叶密度测量方法,各项指标均符合预期要求,可以为果园冠层喷药提供更精准的指导。

关键词：猕猴桃园冠层叶密度点云语义分割深度学习精准喷雾

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