Results 51 to 60 of about 27,177 (219)
International 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
Shuitu Baochi Xuebao, 2006 通过盆栽模拟干旱试验，测定了干旱胁迫下玉米根系生长情况和根际土壤中速效N、P、K的含量。结果表明，干旱胁迫抑制了玉米拔节期和抽雄-开花期玉米根系的生长，减弱了玉米根系的吸收能力。干旱胁追下玉米根际NH4^＋-N、NO3^--N、速效P和速效K均发生根际富集现象。其中有效N和速效K含量高于正常供水．而速效P却呈现低于正常供水的趋势。干旱胁追抑制玉米根系生长、减弱根系吸收能力是玉米减产的重要原因。
韩希英, 宋凤斌
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重金属镉、铜在苹果幼树体内的分布特性及生物有机肥对减少重金属效应的研究
Shuitu Baochi Xuebao, 2004 通过土壤追施镉、铜,研究了重金属在红富士苹果幼树体内的分布特性以及生物有机肥影响红富士苹果幼树根系吸收重金属的效应.结果表明,重金属镉、铜在苹果植株不同器官含量分布顺序为根系>二年生枝>一年生枝>叶片;根系富集铜的能力大于镉; 生物有机肥可以减少根系对铜的吸收.在低剂量处理下,施用生物肥处理的根系铜含量比不施用的降低15%,在中、高剂量处理下,根系铜含量降低幅度分别为30%和50%; 生物有机肥可以降低苹果根系对镉元素的吸收.在低、中、高剂量处理下 ...
张连忠 路克国 王宏伟 杨吉华
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Shuitu Baochi Xuebao, 2021 为明确滇南地区普洱茶种植下土壤优先路径特征以及根系对其形成的影响，以典型普洱茶产地为研究对象，灌草地为对照，基于染色示踪法与图像处理技术，定量分析普洱茶树根系特征与土壤优先路径的关系，解释根系对优先路径形成的影响。结果表明：（1）茶地和灌草地染色路径宽度随土层深度增加呈不同幅度的下降趋势，茶地优先路径的连通性比灌草地差，优先路径的发育程度小于灌草地；（2）根系主要集中分布在土壤表层，随土层深度增加，根重密度、不同径级根长密度均呈减小趋势，径级≤1 mm的根长密度贡献度最大，达到84.08%；（3 ...
卢华兴 +5 more
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New Phytologist, EarlyView.Summary Herbarium specimens are widely distributed in space and time, thereby capturing diverse conditions. We reconstructed specimen ‘lived’ climate from knowledge of germination cues and collection dates for 14 annual species in the Streptanthus (s.l.) clade (Brassicaceae) to ask: which climate attributes best explain specimen phenological stage and ...
Megan Bontrager +6 more
wiley +1 more source
地面－大気インターフェイスがパッチスケールでの分光反射および地表面フラックスへ及ぼす影響 [PDF]
, 1999 Thesis (Ph. D. in Science)--University of Tsukuba, (A), no.
Higuchi Atsushi, 樋口 篤志
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New Phytologist, EarlyView.Summary Evidence for the ongoing biodiversity crisis rests on assessment of a small fraction of described species, with major knowledge gaps for most organisms, including plants. Here, we highlight how digitised herbarium specimens can be used to accelerate and improve estimates of recent and ongoing plant extinctions.
Aelys M. Humphreys +4 more
wiley +1 more source
Studies on the mechanisms of adventitious and lateral root formation in plant [PDF]
, 2005 Thesis (Ph. D. in Science)--University of Tsukuba, (A), no.
黒羽 剛
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New Phytologist, EarlyView.Summary Under a changing climate, it is imperative that we understand how species may respond to temperature impacts, which can differ among populations of the same species due to local drivers. Thermal tolerance data, which can be used to assess an organism's upper thermal limits, is valuable to identify species and/or populations' susceptibility to ...
Nicole Said +5 more
wiley +1 more source
Shuitu Baochi Xuebao, 2021 根系的存在对土壤大孔隙的产生及渗透特性有着重要影响，为研究浅表层土体中根系生物量与土壤大孔隙特征之间的数值关系，在缙云山针阔混交林中选取杉木单株植物根际土体为研究对象，进行染色示踪试验及根系生物量测量，取样后在室内采用自制定水头装置进行水分穿透试验和渗透试验。结果表明：（1）不同土壤剖面和不同土层深度的土壤染色面积不同，距离树木主干位置越远的剖面染色面积越大，而距离主干位置越近的剖面染色面积越小，且随着土层深度的增加整体上每个剖面上染色面积比均下降；（2 ...
祁子寒 +5 more
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