Results 91 to 100 of about 1,046,914 (211)

水土保持生态修复的若干科学问题

open access: yesShuitu Baochi Xuebao, 2005
生态修复是水土保持生态建设的深化和发展。在综合分析国内外生态修复研究进展、发展趋势、存在问题的基础上,根据我国水土流失造成生态系统退化的特殊性,以及水土保持生态修复的特点,提出了一系列我国水土保持生态修复过程中需要深入研究的科学问题。主要包括生态修复的潜力及驱动因子,不同尺度生态修复的布局,生态修复技术措施及标准,以流域为单元的生态系统健康评价,水土保持生态修复对生态水文过程、植被演替、生物多样性、农村经济的影响等的综合评价与预测等。
刘国彬 杨勤科 陈云明 张文辉 许明祥
doaj   +2 more sources

塔里木河下游输水后的生态变化及其效应研究

open access: yes, 2006
以生态恢复和环境保护为根本目的的塔里木河下游生态输水工程已经实施了近6年,其间近20.0×108m3生态水已成功输送到塔里木河下游,许多研究表明,塔里木河下游生态环境出现了许多积极的响应和变化。如何用可持续发展的观点认识和实现生态过程与经济过程的和谐统一具有重要的科学研究意义。本文以塔里木河下游生态输水工程为依托,以生态输水后塔里木河下游的生态变化为主要研究内容,以输水过程中的地下水变化-地表生态变化-以及因生态变化而表现出的响应效应的生态经济价值为研究的主线,探讨了塔里木河下游输水后地下水 ...
叶茂
core  

生态系统结构与功能:前沿与展望

open access: yes, 2021
生态系统是由生物群落及其生存环境共同组成的动态平衡体系,是生态学研究的基本单元。自20世纪30年代提出生态系统概念(Tansley,1935)以来,生态系统生态学逐渐成为生态学研究的核心方向之一,形成了完备的理论与方法体系。近年来,全球变化不断加剧,并已对生态系统的结构和过程产生了深远的影响。解析生态系统组成、结构及其动态,阐明其对生态系统功能和服务的影响,是认识生态系统如何响应全球变化的基础 ...
王志恒, 刘玲莉
core  

The Emotional Valence Paradox in Social media: A Computational Linguistic Analysis of How Sentiment, Emotion, and Content Domain Predict Social Comparisons on Rednote

open access: yesInternational Journal of Applied Linguistics, EarlyView.
ABSTRACT This computational linguistic study analyzes 8743 Rednote posts to examine how sentiment, emotion, and content domain collectively shape social comparison dynamics on social media. We identify four key findings: (1) an emotional gradient, where upward comparison content exhibits the highest sentiment scores and downward comparison the lowest; (
Michelle Mingyue Gu   +7 more
wiley   +1 more source

藻类生态型研究进展

open access: yes, 2017
藻类是海洋中重要的初级生产者,从热带到极地均有分布。在不同的生态环境中,藻类为了适应不同环境条件及环境变化,逐渐形成了不同的生态类型。本文对生态型的概念、研究方法进行归纳总结,提出大型藻类生态型的划分方法,即根据生态环境、生物学特征和遗传特征进行划分。着重分析了藻类生态型的研究现状、存在的问题,提出表型特征可以作为一个划分生态型的参考因素,但不能作为绝对的衡量标准。最后,作者通过分析黄海漂浮浒苔的环境特点、遗传差异和生物学特征,将漂浮浒苔视为一种漂浮生态型 ...
刘正一   +5 more
core  

Reconceptualising Motivation as Material‐Semiotic Entanglements: Translanguaging in Graduate TESOL Education

open access: yesInternational Journal of Applied Linguistics, EarlyView.
ABSTRACT Multilingual students in Anglophone universities often operate in survival mode. While translanguaging supports learning, critical gaps remain in understanding how translanguaging pedagogies transform and sustain motivation in English‐dominant contexts.
Melissa Jufenna Slamet, Julie Choi
wiley   +1 more source

民族生态审美学

open access: yes, 2004
本书阐释了民族生态审美思想,民族生态美的形成,民族生态环境美,民族生态美的价值 ...
袁鼎生, 黄秉生
core  

Language Mindset and Discipline Mindset Both Matter: Exploring the Effect of Growth Mindset on Motivation and Willingness to Communicate in EMI Higher Education

open access: yesInternational Journal of Applied Linguistics, EarlyView.
ABSTRACT In English medium instruction (EMI), students face cognitive and emotional demands in second language (L2) communication, which may hamper their motivation and willingness to communicate (WTC). Adopting a mixed‐methods design, this study explores how growth mindsets affected student motivation (e.g., ideal L2 self and ideal disciplinary self ...
Pengzhan Yang   +2 more
wiley   +1 more source

制约蓝藻种群的生态因子

open access: yes, 1984
藻类和微生物作为水体生态系统中的成员,它们之间的相互影响是关系生态平衡不容忽视的重要因素之一。本文报道了不同类型的11株抑制或溶解蓝藻的微生物,描述了它们的溶藻特点及其它生物学特性。它们在分类上分别属于粘球菌、溶解杆菌、屈挠杆菌、鞘丝菌、芽孢杆菌及链霉菌等6个属,其中包括直孢鞘丝菌、中华屈挠杆菌两个本文作者发表的新种。鞘丝菌能溶藻是第一次记载。研究结果进一步揭示了对蓝藻起制约作用的微生物类群的多样性 ...
李勤生,黎尚豪
core  

From “Striving to Survive” to “Striving to Thrive”: A Narrative Inquiry Into a Student's Motivational Development via Translanguaging in EAP and EMI Contexts

open access: yesInternational Journal of Applied Linguistics, EarlyView.
ABSTRACT While English‐medium instruction (EMI) and English for Academic Purposes (EAP) courses are designed to promote language and content learning, their prevailing English‐only approaches often undermine students’ learning motivation. Against this backdrop, translanguaging has gained recognition as an effective pedagogical practice to support ...
Yihai Wen, Fan Fang
wiley   +1 more source

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