检索结果-南通市图书馆

Are regional precipitation-productivity relationships robust to decadal-scale dry period?

在线全文

学校读者我要写书评

暂无评论

Journal of Plant Ecology 2022年第4期15卷 711-720页

作者： Zhongmin Hu minqi liang Alan Knapp Jianyang Xia Wenping Yuan School of Geography South China Normal UniversityShipai CampusGuangzhou 510631China College of Ecology and Environment Hainan UniversityHaikou 570228China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082China Department of Biology and Graduate Degree Program in Ecology Colorado State UniversityFort CollinsCO 80523USA Tiantong National Forest Ecosystem Observation and Research Station School of Ecological and Environmental SciencesEast China Normal UniversityShanghai 200062China Institute of Eco-Chongming(IEC) Shanghai 200062China School of Atmospheric Sciences Sun Yat-Sen UniversityGuangzhou 519082China

Precipitation(PPT)is the primary climatic determinant of plant growth and aboveground net primary productivity(ANPP)for many of the world’s major terrestrial ***,relationships between PPT and productivity can provide insight into how changes in climate may alter ecosystem functions *** PPT–ANPP relationships for grasslands are found remarkably similar around the world,but whether and how they change during periods of extended climatic anomalies remain ***,we quantifed how regional-scale PPTANPP relationships vary between an extended wet and a dry period by taking advantage of a 35-year record of PPT and NDVI(as a surrogate for ANPP)at 1700 sites in the temperate grasslands of northern *** found a sharp decrease in the strength of the spatial PPT–ANPP relationship during an 11-year period of below average *** attributed the collapse of this relationship to asynchrony in the responses of different grassland types to this decadal period of increased *** results challenge the robustness of regional PPT–productivity if aridity in grasslands is increased globally by climate change.

关键词： grassland net primary productivity precipitation–productivity relation drought climate change NDVI

Four decades of full-scale nitrous oxide emission inventory in China

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

National Science Review 2024年第3期11卷 137-149页

作者： minqi liang Zheyan Zhou Peiyang Ren Han Xiao Xu-Ri Zhongmin Hu Shilong Piao Hanqin Tian Qing Tong Feng Zhou Jing Wei Wenping Yuan School of Atmospheric Sciences Guangdong Province Data Center of Terrestrial and Marine Ecosystems Carbon Cycle Sun Yat-sen University State Key Laboratory of Tibetan Plateau Earth System Resources and Environment Institute of Tibetan Plateau Research Chinese Academy of Sciences Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province Hainan University Sino-French Institute for Earth System Science College of Urban and Environmental SciencesPeking University Schiller Institute for Integrated Science and Society Department of Earth and Environmental Sciences Boston College Institute of Energy Environment and Economy Tsinghua University Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)

China is among the top nitrous oxide（N2O）-emitting countries, but existing national inventories do not provide full-scale emissions including both natural and anthropogenic sources. We conducted a four-decade（1980–2020） of comprehensive quantification of Chinese N2O inventory using empirical emission factor method for anthropogenic sources and two up-to-date process-based models for natural sources. Total N2O emissions peaked at 2287.4（1774.8–2799.9） Gg N2O yr-1in 2018, and agriculture-developed regions, like the East, Northeast, and Central, were the top N2O-emitting regions. Agricultural N2O emissions have started to decrease after 2016 due to the decline of nitrogen fertilization applications, while, industrial and energetic sources have been dramatically increasing after 2005. N2O emissions from agriculture, industry,energy, and waste represented 49.3%, 26.4%, 17.5%, and 6.7% of the anthropogenic emissions in 2020,respectively, which revealed that it is imperative to prioritize N2O emission mitigation in agriculture,industry, and energy. Natural N2O sources, dominated by forests, have been steadily growing from 317.3（290.3–344.1） Gg N2O yr-1in 1980 to 376.2（335.5–407.2） Gg N2O yr-1in 2020. Our study produces a Full-scale Annual N2O dataset in China（FAN2020）, providing emergent counting to refine the current national N2O inventories.

关键词： nitrous oxide four decades anthropogenic sources natural sources

Recent greening of grasslands in northern China driven by increasing precipitation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Plant Ecology 2021年第5期14卷 843-853页

作者： Kai Di Zhongmin Hu Mei Wang Ruochen Cao minqi liang Genan Wu Ruru Chen Guangcun Hao Yaolong Zhao School of Geography South China Normal UniversityShipai CampusGuangzhou 510631China Synthesis Research Center of Chinese Ecosystem Research Network Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100101China China Communications Construction Co.Ltd. Fourth Harbor Engineering Institute Co.Ltd.Guangzhou 510230China China Communications Construction Co.Ltd. Key Laboratory of Environmental Protection&Safety of Communication Foundation EngineeringGuangzhou 510230China

Aims Recent warmer and wetter climate in northern China remains a hot topic in recent years,yet its effect on vegetation growth has not been fully *** study investigated the temporal change of vegetation cover and its correlations with climatic variables from 1982 to 2018 for grasslands in northern *** aim is to clarify whether the warmer and wetter climate in recent years drives the greening of the vegetation in this *** We investigated the temporal dynamic of vegetation normalized difference vegetation index(NDVI)and its driving forces based on long time-series *** regression was used to examine whether there was a turning point of the trend of NDVI and climatic *** correlation analyses were conducted to quantify the relationship between NDVI and climatic *** multivariable regression was used to quantify the contributions of climate variables to the temporal variations in *** Findings We found a turning point of NDVI trend in 2008,with GIMMS NDVI indicating a slight increase of 0.00022 yr?1 during 1982–2008 to an increase of 0.002 yr?1 for GIMMS NDVI during 2008–2015 and 0.0018 yr?1 for MODIS NDVI during 2008–*** was the predominant driver,and air temperature and vapor pressure deficit exerted a minor impact on the temporal dynamics of ***,our results suggest a turning point of NDVI trend,and that recent warmer and wetter climate has caused vegetation greening,which provides insights for better predicting the vegetation cover in this region under changing climate.

关键词： plant growth temporal dynamics turning point trend change climate change

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

基于协同学理论的大学民族传统体育教学研究

中华武术 2020年第12期 119-121,118页

作者：梁敏棋吉林体育学院研究生院吉林长春130000

从协同学的思想出发,运用协同学理论对民族传统体育教学进行探索,分析协同学理论在民族传统体育课程教学中的内部协同作用,探讨民族传统体育教学从被组织到自组织教学的发展,运用协同学理论构建自组织教学模式。旨在更好地推进协同学理... 详细信息

从协同学的思想出发,运用协同学理论对民族传统体育教学进行探索,分析协同学理论在民族传统体育课程教学中的内部协同作用,探讨民族传统体育教学从被组织到自组织教学的发展,运用协同学理论构建自组织教学模式。旨在更好地推进协同学理论在民族传统体育课程教学中的应用,使民族传统体育课程教学得以更好的发展。

关键词：协同学理论大学民族传统体育民族传统体育教学

在线全文

学校读者我要写书评

暂无评论

丹七片中原儿茶醛的含量测定

中国临床药学杂志 2005年第3期14卷 186-187页

作者：梁民琦胜利油田中心医院临床药学研究室东营257034

目的建立测定丹七片中原儿茶醛含量的HPLC法。方法色谱柱:KromasilC18柱(250mm×4.6mm,5μm);流动相:甲醇-0.2mol·L-1醋酸铵(用HCl调pH至2.2)(12∶88,V/V);流速1.0mL·min-1;柱温30℃;检测波长313nm。以原儿茶醛为对照品,外标法定量。结果原儿茶醛线性范围0.04～0.20mg·L-1(r=0.9999),平均回收率99.99%,RSD1.0%。结论本法简便、准确,可用于该药品的质量控制。

关键词：丹七片原儿茶醛高效液相色谱含量测定

近40年(1982年—2018年)中国草原区干湿变化趋势分析

在线全文

学校读者我要写书评

暂无评论

遥感学报 2022年第12期26卷 2629-2641页

作者：底凯胡中民郝珖存曹若臣梁敏琪韩道瑞吴戈男华南师范大学地理科学学院广州510631 中交四航工程研究院有限公司广州510230 中交交通基础工程环保与安全重点实验室广州510230 中国科学院地理科学与资源研究所生态系统观测与模拟重点实验室北京100101 中国科学院大学资源与环境学院北京100049

在全球变暖影响下,由降水、气温等气象要素所主导的干湿条件在全球或区域上均发生了明显变化,中国草原区对气候变化敏感、具有明显的生态脆弱性特征,因此研究中国草原区的干湿变化趋势非常重要。本研究基于干旱指数分析了1982年—2018... 详细信息

在全球变暖影响下,由降水、气温等气象要素所主导的干湿条件在全球或区域上均发生了明显变化,中国草原区对气候变化敏感、具有明显的生态脆弱性特征,因此研究中国草原区的干湿变化趋势非常重要。本研究基于干旱指数分析了1982年—2018年中国草原区的干湿程度时空变化趋势。结果表明,1982年—2018年中国草原区的干旱指数呈不显著上升趋势。2005年前后两个时期中国草原区表现出显著的趋势差异,1982年—2005年中国草原区干旱指数呈下降趋势,即干旱程度增加,而2006年—2018年呈增加趋势,该时段湿润化明显。2006年之后的中国草原区湿润化趋势源于该地区降水持续增多,而增温停滞导致潜在蒸散发不再升高。分区域来看,1982年—2005年内蒙古草原区干旱指数呈下降趋势,2006年—2018年呈上升趋势;西北草原区在1982年—2005年和2006年—2018年两个时间段干旱指数均呈上升趋势;青藏草原区在1982年—1994年干旱指数呈下降趋势,1995年—2018年呈上升趋势。

关键词：遥感中国草原区干旱指数动态变化转变气候变化

不同浓度艾拉溶液对艾拉光动力疗法治疗尖锐湿疣的影响

在线全文

学校读者我要写书评

暂无评论

右江医学 2016年第1期44卷 30-33页

作者：梁敏奇黄小耿李洁霞广西医科大学第八附属医院暨贵港市人民医院皮肤科贵港537100

目的研究不同浓度艾拉溶液(5-aminolevulinic acid solution,ALA)对光动力疗法治疗尖锐湿疣的影响。方法选择门诊就诊的204例尖锐湿疣患者,随机分为三组,每组68例,1组采用10%ALA溶液,2组采用15%ALA溶液,3组采用20%ALA溶液进行光动力疗... 详细信息

目的研究不同浓度艾拉溶液(5-aminolevulinic acid solution,ALA)对光动力疗法治疗尖锐湿疣的影响。方法选择门诊就诊的204例尖锐湿疣患者,随机分为三组,每组68例,1组采用10%ALA溶液,2组采用15%ALA溶液,3组采用20%ALA溶液进行光动力疗法治疗。比较三组治疗结束后的疗效和复发率。结果三组疗效比较,2组、3组疗效显著优于1组,差异有统计学意义(P0.05)。6个月内三组复发率比较,2组、3组复发率显著低于1组(P0.05)。结论艾拉光动力疗法治疗尖锐湿疣选择15%ALA溶液和20%ALA溶液疗效显著,且复发率低。但考虑经济原因,选择15%的ALA溶液不仅能有效治疗尖锐湿疣,还能降低治疗费用。

关键词：尖锐湿疣光动力疗法艾拉溶液

在线全文

学校读者我要写书评

暂无评论

1970-2018年全球整体干旱持续增加

Journal of Geographical Sciences 2023年第3期33卷 449-463页

作者：罗登楠胡中民戴黎聪侯国龙底凯梁敏琪曹若臣曾翔 School of Geography South China Normal UniversityGuangzhou 510631China Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province Hainan UniversityHaikou 570228China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082GuangdongChina International Institute for Earth System Sciences Nanjing UniversityNanjing 210023China

Climate change is expected to introduce more water demand in the face of diminishing water supplies,intensifying the degree of aridity observed in terrestrial ecosystems in the 21st *** study investigated spatiotemporal variability within global aridity index(AI)values from *** results revealed an overall drying trend(0.0016 yr-1,p<0.01),with humid and semi-humid regions experiencing more significant drying than other regions,including those classified as arid or *** addition,the Qinghai-Tibet Plateau has gotten wetter,largely due to the increases in precipitation(PPT)observed in that *** drying is driven primarily by decreasing and increasing PPT and potential evapotranspiration(PET),*** in PPT alone or increases in PET also drive global aridification,though to a lesser *** and increasing potential evapotranspiration(PET),with increasing PET alone or decreasing PPT *** less than half of the world’s land area has exhibited a wetting trend,largely owing to increases in regional *** some parts of the world,the combined effects of increased PPT and decreased PET drives wetting,with decreases in PET alone explaining wetting in *** results indicate that,without consideration of other factors(e.g.,CO_(2)fertilization),aridity may continue to intensify,especially in humid regions.

关键词： aridity index climate change arid area drying trend

生物反馈电刺激在产后盆底功能障碍性疾病中的临床应用进展

在线全文

学校读者我要写书评

暂无评论

医学综述 2023年第21期29卷 4648-4652页

作者：卢彩洪麦尚敏梁敏琪中山市小榄人民医院妇产科广东中山528415 中山市民众医院妇产科广东中山528441

盆底功能障碍性疾病(PFD)是产后女性常见的疾病,主要指产后女性盆底肌功能异常引起的盆底肌功能障碍,对患者的生活质量和身心健康造成严重影响。随着人们对自身物质与精神需求的提高,社会及临床工作者逐渐重视女性产后身心健康的恢复情... 详细信息

盆底功能障碍性疾病(PFD)是产后女性常见的疾病,主要指产后女性盆底肌功能异常引起的盆底肌功能障碍,对患者的生活质量和身心健康造成严重影响。随着人们对自身物质与精神需求的提高,社会及临床工作者逐渐重视女性产后身心健康的恢复情况。生物反馈电刺激可对机体肌肉及神经产生刺激,促进盆底功能恢复,缓解产后女性不良情绪,促使患者身心健康得到改善。目前,生物反馈电刺激应用于产后PFD治疗的效果十分明显,但关于生物反馈电刺激应用于产后PFD的疗效稳定性和持续性还需进一步多中心随访研究证实。

关键词：盆底功能障碍性疾病产后生物反馈电刺激