Results 101 to 110 of about 1,186,146 (205)

生态系统关键参量监测设备研制与生态物联网示范

open access: yes, 2016
本文主要介绍国家重点研发计划2016年首批立项的重点专项"生态系统关键参量监测设备研制与生态物联网示范"(2016YFC500100)的项目立项背景、主要研究内容及总体目标。本项目紧密围绕国家生态监测需求,与国际上生态监测科学技术前沿并跑,研发生态系统关键参量监测设备和生态物联网关键技术,开展示范和产业化推广,推动我国生态监测技术的自主创新,服务我国脆弱生态修复与保护需求,增强我国生态监测的立体化、自动化、智能化水平 ...
郭建文   +10 more
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  

Exploring Chinese International Students’ Intercultural Competence in Australian University Classrooms: Challenges and Opportunities

open access: yesInternational Journal of Applied Linguistics, EarlyView.
ABSTRACT With the increasing number of Chinese international students in Australian universities, intercultural competence has become a critical factor influencing their interactions with Australian tutors in university classroom settings. Existing research often examines students’ intercultural competence from a single‐method or single‐perspective ...
Jiangyu Han, Linda Tsung
wiley   +1 more source

白酒工业生态中的微生物生态学

open access: yes, 2001
微生物生态学是生态学的一个分支 ,白酒微生物生态是佳酿中国白酒的特殊内容 ,它与白酒工业生态密切相关。白酒工业生态把产品质量提高、环境保护、生态园建设纳为一体来研究 ,也包括了白酒微生物生态学的内容。本文讨论了白酒工业生态与白酒微生物生态对中国白酒生产的特殊重要意义 ...
吴衍庸
core  

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

Unraveling Student Anxiety in EFL Classrooms in China: The Roles of the Classroom Environment and Control–Value Appraisals

open access: yesInternational Journal of Applied Linguistics, EarlyView.
ABSTRACT In this study, control–value theory (CVT) was used to investigate how students’ perceptions of the classroom environment shape their anxiety in the context of English as a foreign language (EFL) learning through the mediating effects of control and intrinsic value appraisals.
Quan Qian, Xianhan Huang
wiley   +1 more source

黄河三角洲植物生态位和生态幅对物种分布-多度关系的解释

open access: yes, 2011
物种分布与多度间的正相关格局非常普遍,但该格局的生态机制却一直不太明确。提出了很多假说来解释这种分布-多度关系,其中物种的生态幅和生态位(资源可利用性)机制的研究较多。为了验证物种的生态幅和生态位是否能解释物种的多度-分布格局,研究了黄河三角洲地区湿地植物分布、多度、生态位和生态幅间的关系,结果表明:该区物种分布与多度呈显著正相关,且均与生态幅显著正相关,物种分布与生态位显著负相关,但物种多度与生态位相关性不显著。这说明物种的分布越广,其多度越高,环境容忍度越大;而可利用资源更多的物种分布更广 ...
马克明, 王德, 袁秀
core  

Enacting Everyday Linguistic Citizenship: Language Life and Multi‐Membership Among Young Malaysian Chinese Immigrants in Australia

open access: yesInternational Journal of Applied Linguistics, EarlyView.
ABSTRACT This article examines the language life of young Malaysian Chinese immigrants in Australia and their construction of multi‐membership as reflected in their daily language behaviors. It develops the concept of everyday linguistic citizenship and uses this concept as a theoretical lens to understand how the young adults build, maintain, and ...
Xiaoyi Zhang   +2 more
wiley   +1 more source

基于遥感技术的干旱区生态系统服务价值研究

open access: yes, 2008
生态系统服务价值是生态系统生物资源直接价值及其生态服务功能价值的总和,对生态系统服务价值进行评估是政府宏观决策和生态环境建设的必要条件。针对干旱区支撑资源开发的生态环境相对比较脆弱,制约资源利用的自然灾害十分频繁,大规模人类活动和工程建设诱发的土地沙漠化与盐渍化、草场退化、河湖水质恶化、生物多样性减少等一系列生态环境问题日趋严重这一情况,本论文基于遥感技术在干旱区开展生态系统服务价值研究。本文选择塔里木河下游的尉犁县为研究区,在3S技术的支持下,本文利用地面Landsat TM数据、中巴卫星数据 ...
黄成荣
core  

Off‐Task Talk to Manage Relationship Work During Student Group Work in Second Language Classrooms

open access: yesInternational Journal of Applied Linguistics, EarlyView.
ABSTRACT This paper presents a conversation analytic study on student relationship work in off‐task talk (OTT) during group work in foreign language classrooms. Often seen as disengagement from tasks, OTT's social and relational functions in student classroom group interaction and formation remain underexplored.
Yanyan Li
wiley   +1 more source

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