Results 31 to 40 of about 1,395,642 (164)

Seasonality of temperature dependence of methane fluxes from natural wetlands

open access: yesFunctional Ecology, Volume 39, Issue 9, Page 2383-2397, September 2025.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Temperature dependence is a crucial parameter in estimating methane (CH4) fluxes from natural wetlands, yet our understanding of this parameter remains inadequate. Seasonal fluctuations in water levels and ecosystem productivity lead to seasonal differences in CH4 ...
Jinshuai Li   +6 more
wiley   +1 more source

乌鲁木齐降水分布型及其40多年来的变化

open access: yes, 2006
使用乌鲁木齐站1961-2003年的月降水值,分析了降水的年分布型及其随时间的变化。年降水距平数据经过标准化处理并计算了对应于R+1.17σ、R+0.33σ,R-0.33σ和R-1.17σ的值,以分析该年份是否为很干、干、正常、湿和很湿的年份。对年内暖半年和冷半年的降水分布型及其趋势也作了分析。结果表明,年降水显示出了增加趋势,尤其是20世纪80年代初期以来最为明显;冷暖2个半年的降水也都呈增加趋势。60年代和70年代早中期,干旱和很干旱年份出现频率很高,此后湿润和很湿润年份的数量显著增加 ...
李珍, 杨跃辉, 姜逢清
core  

旱塬长期施肥的产量效应与土壤肥力演变

open access: yesShuitu Baochi Xuebao, 1995
9年定位试验的分析结果表明:旱地作物产量,肥料效应与降水有明显的相关性,根据降水年型分析肥料的增产效果,丰水年NPM>NP>M>P;平水年NPM>NP>M>N>P;干旱年NPM>NP>M>P>N。钾肥只在丰水显示增产效果,NPM,M或NP长期施用,不但能够培肥地力,保持土壤养分平衡,而且能够增强土壤贮水性,提高水分利用率。
党廷辉 彭琳
doaj  

World‐wide impacts of climate change and nitrogen deposition on vegetation structure, composition, and functioning of shrublands

open access: yesNew Phytologist, Volume 247, Issue 3, Page 1117-1128, August 2025.
Summary Environmental changes and their effects are among the most pressing topics of today's ecological research. Shrublands, although widespread across the globe, remain understudied in this respect. We conducted a global meta‐analysis of 81 shrubland sites subjected to experimental warming, shifts in precipitation (e.g.
Daijun Liu   +11 more
wiley   +1 more source

不同降水年型和施磷水平对小麦产量的效应

open access: yes, 2017
水肥是黄土旱塬小麦产量提高的两大限制因子。探讨长期定位施肥下不同降水年型和施磷水 平对黄土高原旱作小麦产量效应,可为不同降水年型下合理施用磷肥和提高旱塬小麦产量提供理论依据。【方法】 以黄土高原 30 年长期磷肥定位试验为基础,并将冬小麦生育年降水划分为干旱年型、平水年型和丰水年型,深入 分析不同降水年型和施磷水平对小麦产量、产量构成因素及磷肥贡献率的影响。【结果】干旱年型下各处理的小麦 产量、千粒重、穗粒数、公顷有效穗数与平水年型相比呈降低趋势,丰水年型下则呈增加趋势;与平水年型相比 ...
付威   +4 more
core  

伊塞克湖典型小流域径流变化差异性及其影响因素分析

open access: yesShuitu Baochi Xuebao, 2020
基于伊塞克湖流域近70年来气温、降水和径流量资料,采用Mann—Kendall法、突变检验和小波分析进行研究流域气温、降水和径流量的变化特征及差异性,在此基础上,探讨区域气候变化对径流量的影响。结果表明:(1)1951—2012年伊塞克湖典型小流域气温呈上升的趋势;其中,乔尔蓬-阿塔站(湖盆中部)和克孜尔苏站(东部)气温分别在1975年和1989年后上升趋势增大,秋季增温幅度均对气温升高的贡献较大;2个水文站降水量变化相对复杂,整体呈增加趋势,秋季降水量增加幅度最大。(2)受气温升高和降水量的直接影响 ...
伊丽努尔   +3 more
doaj  

Pollen morphology, deep learning, phylogenetics, and the evolution of environmental adaptations in Podocarpus

open access: yesNew Phytologist, Volume 247, Issue 3, Page 1460-1473, August 2025.
Summary Podocarpus pollen morphology is shaped by both phylogenetic history and the environment. We analyzed the relationship between pollen traits quantified using deep learning and environmental factors within a comparative phylogenetic framework.
Marc‐Élie Adaimé   +4 more
wiley   +1 more source

黄土高原地区50年降水时空动态与趋势分析

open access: yes, 2009
基于黄土高原及周边地区74个气象站1952-2001年降水量数据,计算各站年降水量线性趋势系数,利用ArcGIS地统计模块普通Kriging插值法生成黄土高原地区1952-2001年年降水量和年降水量线性趋势表面,分析年降水量、年降水量线性趋势表面时空分布特征与10年尺度降水量带动态变化。结果表明,黄土高原地区1952-2001年平均年降水量(426.69±67.85)mm,年降水量和年降水量线性趋势存在显著时空分异;年降水量由西向东线性增加,从南到北二次曲线递减,总体上东南西北方向递减 ...
高照良   +3 more
core  

Analysis on the characteristics of typhoon and precipitation in Taizhou, Zhejiang Province(影响台州的台风及其降水分布特征分析)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2015
普查1951~2012年台风资料,对期间影响浙江台州的台风年月际变化、生成源地及常见影响路径、降水量地理分布特点及不同台风路径的降水量空间分布等进行了综合分析.结果表明:影响台州的台风有较明显的年、月际变化特征;台风生成源地主要集中在3个区域,主要影响路径类型有5种;复杂的地形地貌,导致台风降水量分布差异较大;降水量分布与台风登陆前后的移动路径密切相关.
QIUHangpei(裘杭培)   +1 more
doaj   +1 more source

Predicting Democracy Support in the Middle East and North Africa

open access: yesWorld Affairs, Volume 188, Issue 3, Fall 2025.
ABSTRACT Democracy support among Arab citizens has decreased noticeably in the past decade. The Arab Barometer data demonstrates more than an average of 15–30 points drop‐in democracy support depending on the country considered. The present research utilizes the seventh wave data set offered by the Arab Barometer conducted between October 2021 and July
Mehmet Onder, Malek F. Abduljaber
wiley   +1 more source

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