Results 31 to 40 of about 17,679 (167)
Shuitu Baochi Xuebao, 2020 为揭示水耕年限对小麦生产的影响，在江汉平原选取了3种水耕年限（2年、18年、>100年）稻—麦轮作农田，采集了小麦各生育期的土壤样品与成熟期的小麦植株样品，测定了土壤水分、硝态氮含量、铵态氮含量和小麦产量等指标，分析了土壤剖面水—氮动态分布与积累特征，及其对小麦产量的影响程度与机制。结果表明：（1）随水耕年限延长，土壤水分和氮素含量显著增加。水耕2年、18年和100年农田的0—100 cm深度剖面平均体积含水量分别为0.36，0.39，0.42 cm3/cm3。硝态氮和铵态氮在0—20 cm土层富集 ...
段赫 +5 more
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Multiple global change factors alter the scaling of nitrogen to phosphorus in alpine plants
Functional Ecology, Volume 39, Issue 8, Page 2044-2055, August 2025.Read the free Plain Language Summary for this article on the Journal blog. Abstract The stoichiometry and allometry of nitrogen (N) and phosphorus (P) reflect nutrient absorption and dynamic allocation by plants, and can be regulated by global change factors (e.g. nitrogen enrichment, climate warming and altered precipitation). Yet, how multiple global
Jiapu Li +10 more
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Gaoya dianqi, 2018 为了评估变压器绝缘纸板的含水量,从而为现场变压器绝缘状态和寿命估计提供可靠指导,笔者在实验室环境中制备4组不同含水量的油纸绝缘试样,采用极化/去极化电流法（PDC）对不同水分含量绝缘纸板开展了研究,提出了可表征纸板含水量的特征量Qpaper。实验结果表明,PDC曲线对油纸绝缘试样含水量的变化十分敏感,且水分含量的改变对于去极化电流曲线的尾端有很大影响;通过去极化电流曲线可以获得拓展Debye模型的各支路参数,且随着水分含量的增加模型支路数量在增加,最大支路时间常数在变大 ...
夏国强, 吴广宁, 宋臻杰, 高波
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Journal of Applied Ecology, Volume 62, Issue 8, Page 1889-1901, August 2025.By quantifying the diet composition of GAPs over crop stages, farm types and years, this study reveals that generalist predators have potential to produce a stable, predictable top‐down effect on pests in rice agro‐ecosystems. Therefore, promoting the field densities of ubiquitous generalist predators will likely enhance pest management and support ...
Gen‐Chang Hsu +4 more
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甘藷の塊根乾物重歩合の変異に関する作物生理学的研究 [PDF]
, 1968 京都大学0048新制・論文博士農学博士論農博第210号新制||農||78(附属図書館)学位論文||S43||N290(農学部図書室)2235(主査)教授 長谷川 浩, 教授 小野寺 幸之進, 教授 滝本 敦学位規則第5条第2項該当Kyoto ...
平井, 源一
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New Phytologist, Volume 247, Issue 3, Page 1460-1473, August 2025.Summary Podocarpus pollen morphology is shaped by both phylogenetic history and the environment. We analyzed the relationship between pollen traits quantified using deep learning and environmental factors within a comparative phylogenetic framework.
Marc‐Élie Adaimé +4 more
wiley +1 more source
Shuitu Baochi Xuebao, 2019 为对臭柏群落土壤水分空间分布特征进行初步研究，以毛乌素南缘神木大保当镇臭柏（Sabina vulgaris Ant.）群落为研究对象，选取10个样地利用环刀进行土壤取样，通过土壤烘干法测出土壤含水量与蓄水量并进行分析。结果表明：（1）在坡位影响下，各样地间的土壤含水量存在显著性差异（P 沙丘中部 > 丘间低地 > 沙脊，沙丘中部 > 沙丘下部 > 丘间低地 > 沙脊；（2）在坡向影响下，各样地的土壤含水量存在显著性差异（P迎风坡；（3）在林内外植被影响下，各样地的土壤含水量存在显著性差异（P 臭柏 ...
刘姣 +6 more
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Contribution of Different Processes in Wetland Soil N_2O Production in Different Restoration Phases of the Yellow River Estuary, China [PDF]
, 2014 采用时空替代法,选择黄河口生态恢复前后未恢复区(R_0)、2007年恢复区(R_(2007))和2002年恢复区(R_(2002))的芦苇湿地为研究对象,分析了生态恢复工程对湿地土壤N_2O产生不同过程与贡献的影响. 结果表明,尽管不同恢复阶段湿地土壤N_2O总产生量差异明显,但总体均表现为N_2O释放. 恢复区湿地土壤的N_2O产生量大于未恢复区.
孙万龙 +4 more
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The Historical Roots of Energy Consumption: Does Financial Development Matter?
World Affairs, Volume 188, Issue 3, Fall 2025.ABSTRACT The objective of this study is to investigate how statehood experience affects energy consumption through the advancement of finance and its sub‐sectors. By doing so, the study uses the ordinary and two‐stage least squares methods to analyze data from 111 countries spanning from 2000 to 2018.
Therese E. Zogo +2 more
wiley +1 more source
Gaoya dianqi, 2017 变压器绝缘纸中水分会加速油纸绝缘的老化,缩短变压器寿命,因此,准确诊断变压器绝缘纸老化状态以及水分含量对变压器安全运行具有重要意义。文中通过测试分析不同水分、不同聚合度的绝缘油纸回复电压曲线,研究发现当绝缘纸处于低水分含量状态（0.5 ...
尹小兵 +5 more
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