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Auxin-induced AUXIN RESPONSE FACTOR4 activates APETALA1 and FRUITFULL to promote flowering in woodland strawberry

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Horticulture Research 2021年第1期8卷 1431-1442页

作者： Xiangxiang Dong Yanjun li Yuhan Guan Shaoxi Wang He Luo xiaoming li He li Zhihong Zhang liaoning Key Laboratory of Strawberry Breeding and Cultivation College of HorticultureShenyang Agricultural UniversityShenyang 110866China Analytical and Testing Center Shenyang Agricultural UniversityShenyang 110866China

Flowering time is known to be regulated by numerous pathways,such as the autonomous,gibberellin,aging,photoperiod-mediated,and vernalization pathways.These regulatory mechanisms involve both environmental triggers and endogenous hormonal cues.Additional flowering control mechanisms mediated by other phytohormones,such as auxin,are less well understood.We found that in cultivated strawberry(Fragaria×ananassa),the expression of auxin response factor4(FaARF4)was higher in the flowering stage than in the vegetative stage.Overexpression of FaARF4 in Arabidopsis thaliana and woodland strawberry(Fragaria vesca)resulted in transgenic plants flowering earlier than control plants.In addition,FveARF4-silenced strawberry plants showed delayed flowering compared to control plants,indicating that FaARF4 and FveARF4 function similarly in regulating flowering.Further studies showed that ARF4 can bind to the promoters of the floral meristem identity genes APETALA1(AP1)and FRUITFULL(FUL),inducing their expression and,consequently,flowering in woodland strawberry.Our studies reveal an auxin-mediated flowering pathway in strawberry involving the induction of ARF4 expression.

关键词： straw Fragaria flowering

不同降水年型下耕作方式结合覆盖对旱地土壤物理性质和马铃薯产量的影响

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应用生态学报 2024年第2期35卷 447-456页

作者：马晓明李丹雷佳于婕王楠侯贤清魏娜李荣宁夏大学农学院银川750021 固原市原州区昊农家庭农场宁夏固原756000

2018—2021年连续3年在宁夏南部旱作区开展大田定位试验,设置4种耕作方式(翻耕15 cm、深松30 cm、深松40 cm、深松50 cm)和3种覆盖措施(燕麦秸秆覆盖、塑料地膜覆盖、不覆盖),以翻耕15 cm不覆盖处理为对照,探讨不同降水年型下耕作方式... 详细信息

2018—2021年连续3年在宁夏南部旱作区开展大田定位试验,设置4种耕作方式(翻耕15 cm、深松30 cm、深松40 cm、深松50 cm)和3种覆盖措施(燕麦秸秆覆盖、塑料地膜覆盖、不覆盖),以翻耕15 cm不覆盖处理为对照,探讨不同降水年型下耕作方式结合覆盖对旱地土壤容重、团聚体含量、生育期土壤蓄水量和马铃薯产量的影响。结果表明:与试验处理前相比,3年耕作结合覆盖均能有效降低0~60 cm土层土壤容重;同一耕作方式下,不同降水年型均以秸秆覆盖最佳;丰水年20、40 cm土层以深松30 cm覆盖秸秆处理最佳,60 cm土层以翻耕15 cm覆盖秸秆处理最佳,平水年和枯水年20、40、60 cm土层均以深松40 cm覆盖秸秆处理最佳。在0~20 cm土层,>0.25 mm土壤团聚体含量3年均以深松40 cm覆盖秸秆处理最高;20~40 cm土层,丰水年以翻耕15 cm覆盖秸秆处理最高,平水年和枯水年以深松40 cm覆盖秸秆处理最高;在40~60 cm土层,丰水年、平水年、枯水年分别以翻耕15 cm覆盖地膜处理、深松30 cm覆盖地膜处理、深松30 cm覆盖秸秆处理最高,较对照分别显著提高18.8%、27.0%、35.8%。马铃薯关键生育期(现蕾至块茎膨大期)0~100 cm土层土壤蓄水量,丰水年以深松30 cm覆盖秸秆处理最佳,平水年和枯水年均以深松40 cm覆盖秸秆处理最佳,较对照分别显著提高19.4%、19.5%、23.7%。对于马铃薯产量,丰水年以深松30 cm覆盖秸秆处理最佳,平水年和枯水年均以深松40 cm覆盖秸秆处理最佳,较对照分别显著提高84.6%、81.7%、106.3%。相关性分析表明,土壤物理性质的改善可显著影响马铃薯产量,其中以土壤容重和现蕾期土壤蓄水量作用最显著;对不同降水年型下马铃薯产量与耕作深度间关系进行拟合发现,耕作深度为34.67~36.03 cm时,马铃薯可获得高产。可见,耕作方式结合覆盖可有效改善土壤物理性质,增加马铃薯生育期土壤蓄水量,从而显著提高产量,其中在丰水年采用深松30 cm覆盖秸秆处理,在平水年和枯水年采用深松40 cm覆盖秸秆处理可实现旱作区马铃薯增产。

关键词：降水年型耕作方式覆盖土壤物理性质马铃薯产量

Nitrogen and phosphorus translocation of forest floor mosses as affected by a pulse of these nutrients

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Journal of Plant Ecology 2020年第5期13卷 633-640页

作者： Xin liu Zhe Wang xiaoming li Weikai Bao Ecological Security and Protection Key Laboratory of Sichuan Province Mianyang Normal UniversityMianyang 621000China Chinese Academy of Sciences(CAS)Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization&Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province Chengdu Institute of BiologyChinese Academy of SciencesChengdu 610041China College of life Sciences Shanghai Normal UniversityShanghai 200234China

藓类是亚高山森林、北方针叶林和极地苔原等原始生态系统的重要组成部分。养分沉降是这些生态系统的主要养分来源。然而,对藓类如何利用大气沉降这一时间上异质性较高的养分来源的认识缺乏,限制了我们对藓类在生态系统养分循环中作用的... 详细信息

藓类是亚高山森林、北方针叶林和极地苔原等原始生态系统的重要组成部分。养分沉降是这些生态系统的主要养分来源。然而,对藓类如何利用大气沉降这一时间上异质性较高的养分来源的认识缺乏,限制了我们对藓类在生态系统养分循环中作用的认识,也制约了模拟和预测生态系统服务功能动态变化的有效性。本研究中,我们重点关注如下问题:(1)藓类新生部分的氮、磷含量随氮或磷沉降量的变化;(2)氮或磷养分沉降如何影响藓类的氮磷转运;(3)氮磷转运与藓类新生部分养分含量的关联性?为此,我们在位于青藏高原东部的亚高山冷杉林中开展了设置有不同氮、磷施加量水平的突发养分沉降实验。以林下优势度最高的塔藓和锦丝藓为对象,我们在施加实验处理8天和1年后,分别测定了不同年龄藓类茎段中的氮、磷含量。研究结果发现,养分处理8天后,锦丝藓和塔藓的所有茎段的氮或磷含量均随处理中氮或磷施加量的增加而增加,表明它们能够高效率地吸收施加的氮或磷。养分处理1年后,形成于养分处理后的新生茎段中的氮、磷含量以及氮磷比与处理后8天的藓类茎段中氮、磷含量以及氮磷比呈正相关关系,表明藓类将吸收的养分转运至新生部分,转运过程受源—库关系的调控。磷转运效率解释了新生茎段21%-23%的氮磷比变化,而氮转运与新生茎段氮磷比没有显著关系,结果暗示磷转运对藓类生长的重要性。上述结果表明,养分转运是藓类植物利用间断的沉降养分的关键机制,也使藓类成为生态系统中重要的养分库。

关键词：林下藓类养分回收养分循环突发养分沉降老龄林

The characteristics of multi-source mobility datasets and how they reveal the luxury nature of social distancing in the U.S. during the COVID-19 pandemic

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International Journal of Digital Earth 2021年第4期14卷 424-442页

作者： Xiao Huang Zhenlong li Yuqin Jiang Xinyue Ye Chengbin Deng Jiajia Zhang xiaoming li Department of Geosciences University of ArkansasFayettevilleARUSA Department of Geography University of South CarolinaColumbiaSCUSA Landscape Architecture and Urban Planning Texas A&M UniversityCollege StationTXUSA Department of Geography State University of New York at BinghamtonBinghamtonNYUSA Department of Epidemiology and Biostatistics University of South CarolinaColumbiaSCUSA Department of Health Promotion Educationand BehaviorUniversity of South CarolinaColumbiaSCUSA

This study reveals the human mobility from various sources and the luxury nature of social distancing in the U.S during the COVID-19 pandemic by highlighting the disparities in mobility dynamics from lower-income and upper-income counties.We collect,process,and compute mobility data from four different sources.We further design a Responsive Index(RI)based on the time series of mobility change percentages to quantify the general degree of mobility-based responsiveness to COVID-19 at the U.S.county level.We find statistically significant positive correlations in the RI between either two data sources,revealing their general similarity,albeit with varying Pearson’s r coefficients.Despite the similarity,however,mobility from each source presents unique and even contrasting characteristics,in part demonstrating the multifaceted nature of human mobility.The results suggest that counties with higher income tend to react more aggressively in terms of reducing more mobility in response to the COVID-19 pandemic.Most states present a positive difference in RI between their upper-income and lower-income counties,where diverging patterns in time series of mobility changes percentages can be found.The findings shed light on not only the characteristics of multi-source mobility data but also the mobility patterns in tandem with the economic disparity.

关键词： COVID-19 mobility responsive index visualization big data

数字经济、绿色创新意愿与绿色创新绩效——数据要素内生化的理论研究与经验证据

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中南财经政法大学学报 2024年第1期 134-147页

作者：李小明董航航汪婵山东大学经济研究院山东济南250100 重庆师范大学经济与管理学院重庆401331 上海财经大学金融学院上海200433

本文基于偏向型技术进步框架,将数据要素引入生产研发过程,在理论上刻画了数字产业化的替代效应和产业数字化的渗透效应,构建了数字经济—绿色创新模型,并分析数字经济驱动清洁型和污染型研发相对收益变化,探寻数字经济对绿色创新的影... 详细信息

本文基于偏向型技术进步框架,将数据要素引入生产研发过程,在理论上刻画了数字产业化的替代效应和产业数字化的渗透效应,构建了数字经济—绿色创新模型,并分析数字经济驱动清洁型和污染型研发相对收益变化,探寻数字经济对绿色创新的影响及绿色创新意愿的机制作用;进一步本文利用双向固定效应模型,基于2011—2019年我国城市层面数据进行实证检验。研究发现,数字经济显著提升了绿色创新绩效,该结论经过一系列稳健性检验后依然成立。机制研究表明,数字经济通过促进绿色创新意愿进而提升绿色创新绩效,绿色创新意愿是数字经济提升绿色创新绩效的重要影响机制。本文研究揭示了数字经济的绿色偏向性,为数字绿色发展提供理论支撑。

关键词：数字经济绿色创新绩效绿色创新意愿偏向型技术进步

The effect of mechanical loads on the degradation of aliphatic biodegradable polyesters

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Regenerative Biomaterials 2017年第3期4卷 179-190页

作者： Ying li Zhaowei Chu xiaoming li Xili Ding Meng Guo Haoran Zhao Jie Yao lizhen Wang Qiang Cai Yubo Fan School of Biological Science and Medical Engineering Key Laboratory for Biomechanics and Mechanobiology of Ministry of EducationInternational Research Center for Implantable and Interventional Medical DevicesBeihang UniversityBeijing 100191People’s Republic of China Department of Biomedical Engineer University of CincinnatiCincinnatiOH 45221USA Key Laboratory of Advanced Materials of Ministry of Education of China Tsinghua UniversityBeijing 100084People’s Republic of China National Research Center for Rehabilitation Technical Aids Beijing 100176People’s Republic of China

Aliphatic biodegradable polyesters have been the most widely used synthetic polymers for developing biodegradable devices as alternatives for the currently used permanent medical devices.The performances during biodegradation process play crucial roles for final realization of their functions.Because physiological and biochemical environment in vivo significantly affects biodegradation process,large numbers of studies on effects of mechanical loads on the degradation of aliphatic biodegradable polyesters have been launched during last decades.In this review article,we discussed the mechanism of biodegradation and several different mechanical loads that have been reported to affect the biodegradation process.Other physiological and biochemical factors related to mechanical loads were also discussed.The mechanical load could change the conformational strain energy and morphology to weaken the stability of the polymer.Besides,the load and pattern could accelerate the loss of intrinsic mechanical properties of polymers.This indicated that investigations into effects of mechanical loads on the degradation should be indispensable.More combination condition of mechanical loads and multiple factors should be considered in order to keep the degradation rate controllable and evaluate the degradation process in vivo accurately.Only then can the degradable devise achieve the desired effects and further expand the special applications of aliphatic biodegradable polyesters.

关键词： aliphatic biodegradable polyesters mechanical load degradation

Revisiting the contribution of Fe^(Ⅳ)O^(2+)in Fe(Ⅱ)/peroxydisulfate system

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Chinese Chemical Letters 2023年第3期34卷 181-185页

作者： Kunjie Hou Peng Shen Zhu Wang Zhoujie Pi Fei Chen xiaoming li Haoran Dong Qi Yang College of Environmental Science and Engineering Hunan UniversityChangsha 410082China Ministry of Education Key Laboratory of Environmental Biology and Pollution Control(Hunan University)Changsha 410082China Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment Ministry of EducationCollege of Environment and EcologyChongqing UniversityChongqing 400045China

Recent studies have proposed that the high-valent iron species(such as Fe^(Ⅳ)O^(2+))rather than sulfate radical(SO_(4)^(·-))and hydroxyl radical(·OH)are the main reactive oxidant species(ROS)in Fe(Ⅱ)/peroxydisulfate(PDS)system with the methyl phenyl sulfoxide(PMSO)as the Fe^(Ⅳ)O^(2+)probe.However,many operational factors may interfere with the accuracy of this method,so the contribution of Fe^(Ⅳ)O^(2+)calculated by this method is controversial.In this study,the possible effect of Fe(Ⅱ)concentration,pollutant type,reducing agent,or coexisted anions on Fe^(Ⅳ)O^(2+)production and its corresponding contribution to the removal of target pollutants in the Fe(Ⅱ)/PDS system were investigated in detail,and the intrinsic mechanisms involved were also explored.This study shows that ROS generation is a complex process in the Fe(Ⅱ)/PDS system,and multiple combinatorial approaches are urgently required to deeply explore the contribution of ROS to the elimination of target contaminants.

关键词： Methyl phenyl sulfoxide Fe(Ⅱ)/PDS system Reactive oxidative species Fe^(Ⅳ)O^(2+) Probe

基于层次分析法的致密气藏储层分类定量评价——以新场气田蓬莱镇组气藏为例

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油气藏评价与开发 2024年第3期14卷 468-474,483页

作者：周锋黄仕林李晓明廖开贵李勇中国石化西南油气分公司勘探开发研究院四川成都610041

储层评价是致密砂岩气藏开发的基础,评价结果的准确性直接影响气藏开发的潜力分析,评价方法的选择影响到开发指标预测的可靠性、开发调整部署的科学性。为解决致密砂岩气藏储层评价影响因素多、主控因素不明确、参数敏感性未知、评价指... 详细信息

储层评价是致密砂岩气藏开发的基础,评价结果的准确性直接影响气藏开发的潜力分析,评价方法的选择影响到开发指标预测的可靠性、开发调整部署的科学性。为解决致密砂岩气藏储层评价影响因素多、主控因素不明确、参数敏感性未知、评价指标未量化等问题,以川西新场气田蓬莱镇组气藏为例,运用层次分析法理论,建立定量分析模型,将复杂问题简单化、定性问题定量化。方法优选地球物理、测井解释和地质基础等参数为准则指标,通过构造判断矩阵、确定指标权重、一致性检验等步骤,建立定量评价模型,得到权值向量,再利用真实井进行验证分析可采储量和无阻流量均与评价值呈现较好的相关性,说明研究方法具有较好的可靠性,进一步明确了储层划分类型及标准。根据研究方法确定的气藏储层评价指标,可以深化同区致密砂岩气藏开发“甜点”认识,提升致密砂岩气藏储层预测及开发部署质量,为同类气藏高效开发提供借鉴。

关键词：储层评价致密砂岩判断矩阵参数优选层次分析法

Elevational patterns of carbon,nitrogen and phosphorus in understory bryophytes on the eastern slope of Gongga Mountain,China

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Journal of Plant Ecology 2019年第4期12卷 781-786页

作者： Zhe Wang Chunyan Pi xiaoming li Weikai Bao College of life Sciences Shanghai Normal UniversityShanghai 200234China CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization&Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province Chengdu Institute of BiologyChinese Academy of SciencesChengdu 610041China

Aims The nutrient uptake,requirement and releasing rates of bryophytes are very different from those of tracheophytes.However,it is diffi-cult to make a quantitative evaluation of bryophytes’roles in nu-trient cycling and their specific eco-physiological adaptations due to lack of knowledge of their concentrations and stoichiometric ratios of carbon(C),nitrogen(N)and phosphorus(P).To fill this gap,the present study aims to investigate:(i)what are the elevational trends of C,N and P concentrations and stoichiometric ratios of bryophytes?(ii)whether C,N and P concentrations and stoichio-metric ratios of bryophytes differ between different bryophyte types(in terms of the growth form and living substrate)?and(iii)how do the exponent scalings of N and P of bryophytes change along the elevational gradient?Methods We measured and calculated the C,N,P concentrations and stoi-chiometric ratios of bryophytes from four elevations on the eastern slope of Gongga Mountain(22 species in total).Differences in these traits among elevations,and between different bryophyte types were compared.The log-log allometric regression parameters of N and P at each elevation were also determined and compared.Important Findings The C,N and P concentrations of bryophytes showed decreasing trends with increasing elevations.More specifically,erect bryo-phytes possessed higher C and N concentrations than those of pros-trate species,and terricolous species had higher P concentration than that of corticolous and saxicolous species.Bryophytes from different elevations had an invariant allometric regression slope for P versus N.Future research at a larger scale is in need for a more generalized law of bryophytes.

关键词： allometric scaling growth form living substrate stoichiometric ratio subalpine