Results 71 to 80 of about 23,362 (181)
Conservation Biology, EarlyView.Abstract Despite the crucial role of human impacts on biodiversity loss, many assessments of this loss focus on single metrics, such as species richness, and overlook the multidimensional effects of human activities. Because of its importance to ecosystem functioning, we investigated the functional diversity of medium‐ and large‐sized mammal ...
Xueyou Li +8 more
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Shuitu Baochi Xuebao, 2004 研究了有机肥与化肥配施对旱地红壤有机质和物理性质的影响。结果表明,虽然部分年份各处理土壤有机质含量存在某些程度的波动,但总体上随施肥年限的延长呈增加趋势;与对照处理相比,有机肥能够显著地提高土壤有机质含量。本田还田是该地区提高土壤有机质含量的最佳方法。有机肥施用均可显著地降低红壤旱地土壤容重,提高土壤孔隙度;但不同的种类之间存在一定差异,即秸秆和本田还田的效果优于厩肥和绿肥的。与化肥处理相比,施用有机肥显著地促进了土壤中>1mm和1～0.5mm水稳性团聚体的形成,厩肥和绿肥处理中 ...
李成亮 孔宏敏 何园球
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How Do I Measure up? Social Influence and L2 Motivation in the Algorithmic Age
International Journal of Applied Linguistics, EarlyView.ABSTRACT Comparative thinking is a fundamental human drive and a hallmark of contemporary life. For social action, such as the learning and use of additional languages, a target for appraisal (an L2 attribute) is evaluated in relation to a comparison standard (an appraiser's standpoint).
Alastair Henry, Meng Liu
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Learning Styles, Engagement and Anxiety in AI‐Mediated Writing: A Multimodal Feedback Study
International Journal of Applied Linguistics, EarlyView.ABSTRACT Artificial intelligence (AI) tools now permeate English academic writing. However, evidence on how feedback modalities align with student differences and with psychological mechanisms remains limited. Prior work often reduced learning styles to simple matches with delivery modes and treated learning engagement and writing anxiety as peripheral.
Yi Ren +3 more
wiley +1 more source
土壤呼吸作用时空动态变化及其影响机制研究与展望. [PDF]
, 2009 测定不同陆地生态系统土壤呼吸速率及其时空波动,阐明其影响因子,对于全球碳素平衡预算和全球变化潜在效应估计是最为基本的数据。然而,有关土壤呼吸作用变异性及其影响因素的知识仍存在局限性,一些关键的过程和机制还有待阐明。该文综述了近年来土壤呼吸作用时空动态规律、影响机制和模拟方面的研究进展,指出环境因子和生物因子共同驱动着土壤呼吸作用的时间动态变化;土壤呼吸作用在不同时间尺度上还具有明显的空间异质性,这主要是植被覆盖、根系分布、主要的环境因素和土壤特性空间分布的异质性造成的 ...
周广胜., 韩广轩
core
International Journal of Applied Linguistics, EarlyView.ABSTRACT Generative artificial intelligence (GenAI) has emerged as a powerful tool in the Informal Digital Learning of English (IDLE) environment, offering personalized, interactive, and innovative language learning experiences that may enhance learning engagement.
Jin Liu, Meilu Liu, Yuan Yao, Dechao Li
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Shuitu Baochi Xuebao, 2020 通过大田试验探究不同用量的有机肥与石灰对土壤pH、有机质和Cd有效态含量以及不同生育期水稻各器官中积累Cd的动态变化。结果表明：成熟期水稻各器官Cd含量规律为根 > 茎 > 叶片 > 稻壳 > 糙米。石灰的施用能显著提高土壤pH，在分蘖期时，低用量石灰与高用量石灰处理下土壤pH分别提高1.35，1.84个单位；有机肥的施用可以增加有机质含量，与对照相比，高用量有机肥处理在分蘖期时有机质含量提高6.60 g/kg，在成熟期提高2.72 g/kg。灌浆期是水稻吸收积累Cd的重要时期 ...
骆文轩 +8 more
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Nations and Nationalism, EarlyView.ABSTRACT This study presents one of the first comparative analyses of digital nationalism on social media. Using a computational mixed‐method approach—combining supervised, computer‐assisted content analysis with network modelling—it analyses 64,541 tweets from Twitter and 91,063 posts from Weibo surrounding a shared geopolitical flashpoint: President ...
Chris Chao Su, Jun Liu
wiley +1 more source
Shuitu Baochi Xuebao目的探究干旱河谷区土壤有机碳组分及其稳定性变化特征，明确环境因子与土壤有机碳组分及其稳定性之间的关系，为生态脆弱区固碳减排的系统管理提供依据。方法选择西藏波密干旱河谷区不同坡向（阴坡、阳坡、半阴坡、半阳坡）、坡位（坡下、坡中、坡上） 0~30 cm土壤为研究对象，测定土壤理化性质、土壤有机碳及其组分。结果1）阴坡土壤有机碳质量分数为11.37~34.74 g/kg，相较于半阴坡、半阳坡、阳坡分别提高55%、138%、292%。土壤颗粒有机碳、易氧化有机碳、矿质结合态有机碳 ...
褚保森 +6 more
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Shuitu Baochi Xuebao, 2018 以吉林省农业科学院黑土有机培肥定位试验基地为平台，研究了不同种类有机肥（堆腐肥、鸡粪、牛粪和猪粪）施用对土壤及不同粒级团聚体中有机碳和腐殖质组成的影响。结果表明：与不施肥（CK）和单施化肥（NPK）相比，有机肥配施化肥显著（P0.25 mm粒级团聚体有机碳含量高于其他有机肥处理，且2~0.25 mm粒级团聚体有机碳含量显著高于鸡粪处理；从不同粒级团聚体中腐殖质组分的分布来看，施用堆腐肥后，2~0.25 mm粒级团聚体中HAC和HUC含量显著高于猪粪处理，而0.25~0.053，
魏宇轩 +5 more
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