Results 81 to 90 of about 1,328,681 (221)
Shuitu Baochi Xuebao, 2023 为探究宁夏引黄灌区生态承载力和可持续发展情况,基于生态足迹法,通过生态服务价值当量对生态足迹模型中的通用均衡因子和产量因子进行本地化,定量评价引黄灌区2010—2019年不同土地利用生态承载力状况,并将生态承载力结果与通用因子计算结果进行对比分析,结果表明:(1)优化后均衡因子的 平均值为水域(11.735)＞林地(1.561)＞草地(0.901)＞耕地(0.785)＞建筑用地(0.073)＞未利用地(0.027),产量因子均值为耕地=建筑用地(1.701)＞水域(1.681)＞林地(1.680)＞草地(
郑佳乐 +4 more
doaj
, 2015 1年生草本植物是古尔班通古特沙漠夏秋季节草本层片的主要组成部分。选择4种藜科1年生草本植物(刺沙蓬、沙蓬、角果藜和对节刺)作为研究对象,对比分析了各物种构件形态特征、生物量分配以及它们之间的异速生长关系。结果表明:沙蓬个体最大,其次为刺沙蓬,角果藜和对节刺个体最小;对节刺具有最大的根冠比(R/S),其次是刺沙蓬,沙蓬和角果藜R/S最小。4种植物构件形态与生物量间均呈显著正相关,表现出强烈的协同变化趋势。R/S与绝大部分指标间呈显著负相关,表明随个体增大地下生物量分配比例逐渐减小。4种植物各构件形态 ...
陶冶 +4 more
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International 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
, 2008 全球变化背景下,植被对CO2的减排作用得到了广泛关注。森林生态系统具有诸多功能,不同功能的货币化基准难以统一,是进行总体生态资产价值定量核算的制约要素。在资源、环境与生态经济原理指导下,分析相关方法评估生态系统生态资产的可行性,选择量化评估参数,并通过多种模式与方法进行估算乌鲁木齐城市2004年森林生态系统的生态资产。森林生态系统涵养水源类、生物多样性维持类、净化空气类、保护土壤类以及大气调节类生态资产分别为0.2248×108元、10.6088×108元、0.6308×108元、0.2592 ...
张慧芝 +3 more
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International 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
, 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
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International 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
, 2004 通过试验，科学的论证了只有培肥地力来改善土壤养分贮存库，才能促进荒漠绿洲农田生态系统的主要功能-良性养分循环。(1)建议干旱区应以水利和地力建设为中心，通过人为调控绿洲农田生态系统水分和养分的良性循环；(2)有关植物-碱化土壤生态系统养分循环方面的系统总结；(3)扩大林草面积增加绿色植被覆盖度，可以收到改变绿洲农田小气候和生物改良盐碱土等中低产土的效果。同时草业发展了可以保证农区畜牧业发展，使山区天然草场休养生息，得以自然恢复，使新疆干旱区山区“湿岛”涵养水源效应增强，协调好山盆关系 ...
中国科学院新疆生态与地理研究所
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International 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