Results 11 to 20 of about 170,169 (150)
Shuitu Baochi Xuebao, 2004 分析了黑土腐殖质、黑土母质、黑土区气候、地貌、植被及人类开垦等活动与黑土侵蚀之间的关系，指出了黑土区农业开垦与耕作是导致黑土流失的主要原因，同时，在人类干预条件下，某些自然因素对黑土加速侵蚀的影响就会明显地凸现出来。实际上，黑土区独特的自然环境与人类活动方式已经使其成为目前中国土壤侵蚀潜在危险性最大的地区之一。目前，黑土流失速度相当快．不少地区已经出现了成土母质露于地表的现象，土壤侵蚀严重。如果我们现在还不能正确认识黑土地治理的紧迫性，黑土区很快就将变为名副其实的“不毛之地”了。
范昊明 蔡强国 王红闪
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Mechanistic approaches to investigate soil microbe‐mediated plant competition
Journal of Ecology, Volume 111, Issue 8, Page 1590-1597, August 2023., 2023 Our review highlights recent experimental advancements for uncovering microbial mechanisms that alter plant host resource competition and coexistence. We synthesize these mechanisms into a conceptual model that provides a framework for future experiments to investigate the importance of plant–microbe interactions in structuring plant populations and ...
Y. Anny Chung +2 more
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Chinese Fine‐Grained Geological Named Entity Recognition With Rules and FLAT
Earth and Space Science, Volume 9, Issue 12, December 2022., 2022 Abstract Geological named entity recognition (NER) is an essential prerequisite to realizing geological information extraction and information retrieval and is an actual means for accomplishing structured reconstruction of unstructured geological data.
Siying Chen +5 more
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Key n‐Gram Extractions and Analyses of Different Registers Based on Attention Network
Journal of Applied Mathematics, Volume 2021, Issue 1, 2021., 2021 Key n -gram extraction can be seen as extracting n‐grams which can distinguish different registers. Keyword (as n = 1, 1‐gram is the keyword) extraction models are generally carried out from two aspects, the feature extraction and the model design.
Haiyan Wu +5 more
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A field survey on the dietary use of traditional Chinese medicine in selected regions with the Cantonese, Hakka, and Teochew populations in Guangdong province, China. [PDF]
Food Sci NutrA comprehensive field survey encompassing 3031 participants was conducted. Consumption rates of 42 TCM ranged from 2.6% to 47.3%. Distinct disparities were identified across the Cantonese, Hakka, and Teochew populations. Abstract The purpose of this study was to assess the dietary consumption patterns of traditional Chinese medicine (TCM) among the ...
Peng JW +5 more
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Shuitu Baochi Xuebao, 2021 量化东北黑土区多种外营力作用的坡面复合土壤侵蚀过程，将为坡面水保措施的精确布置提供重要科学依据。基于野外模拟试验，分析了东北典型薄层黑土区（宾县）、中层黑土区（海伦市）和厚层黑土区（克山县）多营力叠加作用的坡面水蚀特征。野外模拟降雨的试验处理包括仅水蚀的试验处理（I）、冻融+水力叠加作用的试验处理（Ⅱ）和冻融+风力+水力叠加作用的试验处理（Ⅲ）。结果表明：与仅有水蚀作用的试验处理相比，冻融作用使典型薄层、中层和厚层黑土厚度区的坡面径流深度分别减小29.4%，39.3%，32.1 ...
何煦, 桑琦明, 郑粉莉, 王一菲
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Shuitu Baochi Xuebao, 2023 为量化分析典型黑土农耕地在冻结过程中的剖面水热耦合特征,以东北典型黑土区耕层土壤为研究对象,通过室内单土柱模拟试验,并结合COMSOL Multiphysics模型PDE模块,实现黑土冻结过程中温度场与水分场的耦合求解。结果表明:(1)COMSOL模型可实现黑土剖面冻结过程的水热耦合分析,温度场(R2=0.83,RMSE=0.91 ℃)与水分场拟合效果(R2=0.88,RMSE=0.02 cm/cm3)均较好,可满足拟合精度需要;(2)黑土农耕地剖面温度的变化速率呈先快速冷却后缓慢趋于稳定的变化趋势 ...
蒋瑶钰, 王彬, 陈祖明, 王文刚
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From demonstrative to definite and beyond: the case of nage in spoken Taiwan Mandarin
Faits de Langues, 2014 When demonstrative pronouns undergo grammaticalization, they have regularly been shown to evolve into definite or specific articles (Lehmann 2002, De Mulder & Carlier 2001). In a synchronic perspective, it has also been shown that for some languages, demonstrative determiners are not restricted to deictic or anaphoric functions, but may extend their ...
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Shuitu Baochi Xuebao, 2020 以吉林省黑土玉米带区域内10对长期定位采样点的2种土地利用方式土壤（耕作黑土和防护林带黑土）为研究对象，采用胶散分组法提取土壤胶散复合体，探究长期不同利用方式对黑土胶散复合体和酸度的影响。结果表明：耕作黑土与防护林带黑土均表现为G0与G2组的绝对含量增加，G1组的绝对含量下降，复合体总量分别下降了3.88%和0.28%。耕作黑土和防护林带黑土pH分别平均下降12.12%和3.77%，有机碳含量在耕作黑土和防护林带黑土中分别平均下降23.17%和9.00%，2种利用方式土壤的胡敏酸、富里酸 ...
丁慧仪, 王淑华, 王继红
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Shuitu Baochi Xuebao, 2022 东北黑土区是我国重要的商品粮生产基地,强烈水土流失导致的黑土厚度下降及土壤质量退化,直接威胁国家粮食安全。系统分析黑土区土壤侵蚀研究成果,对阻控黑土退化、维持土地生产力、保障国家粮食安全具有重要意义,论述了黑土区土壤侵蚀环境与侵蚀环境效应、土壤侵蚀过程与机理、土壤侵蚀时空变化和未来研究展望。多营力复合、缓坡长坡是黑土区独特的侵蚀环境,黑土厚度下降与坡耕地土壤质量退化是该区最典型的侵蚀环境效应。细沟间、细沟、浅沟、切沟及冻融侵蚀发育的动力机制与主控因素差异明显 ...
张光辉, 杨扬, 刘瑛娜, 王志强
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