Shuitu Baochi Xuebao, 2011 为了阐明盐-淡水梯度下河口湿地氮形态含量及储量特征,对闽江河口湿地盐-淡水梯度下氮形态含量、储量及其影响因子进行测定与分析。结果表明:尤溪洲湿地、蝙蝠洲湿地和鳝鱼滩湿地芦苇植物下0-60cm土壤全氮含量平均值分别为0.33,1.12,1.60g/kg;有机氮分别为0.33,1.11,1.58g/kg;铵态氮分别0.97,12.36,20.04mg/kg;硝态氮分别0.85,0.87,1.24mg/kg;储量平均值分别为41.16,104.91,114.35t/km2;41.04,103.75,112 ...
王纯 +5 more
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Shuitu Baochi Xuebao, 2011 以传统水氮管理为对照,进行优化水氮管理条件下氮肥与双氰胺配施对大棚黄瓜氮肥利用效率、氮素淋洗损失及黄瓜产量与品质的影响研究。结果表明,与传统水氮管理相比,优化水氮管理虽然减少了氮肥用量及灌水量,但黄瓜产量与传统处理无显著差异,黄瓜硝酸盐含量显著低于传统处理的硝酸盐含量。随追肥及灌水次数增加,优化水氮管理0-60cm土层硝态氮呈增加趋势,60cm以下各土层不同时期变幅较小,W2N2+DCD、W2N3+DCD、W2N4+DCD的变化范围分别为6.09～33.36mg/kg,19.03～29.28mg/kg ...
聂文静 +4 more
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Shuitu Baochi Xuebao, 2006 通过田间试验研究水稻不同覆盖旱作栽培方式对后茬大麦生长及土壤氮素动态变化的影响。结果表明，盖草处理后茬大麦表层土壤硝态氮含量最高，而土壤铵态氮含量由高到低依次为：水作〉盖草〉覆膜〉裸露，且硝态氮、铵态氮从表层（0～20cm）到底层（60～80cm）依次降低。具有明显的层次性。各处理都表现出0～40cm土层氮素表观盈余，水作、盖草和裸露处理后茬分别比覆膜处理后茬高40．5％，39．5％和36．1％。大麦籽粒产量以盖草处理后茬摄高，分别比水作后茬和裸露后茬增加837kg／hm^2和251kg／hm^2 ...
李勇, 徐阳春, 郭世伟, 沈其荣
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Shuitu Baochi Xuebao, 2018 研究紫色土区坡耕地玉米全生育期细沟侵蚀阶段水土及氮素流失规律，以期为研究区氮素流失有效防控提供科学依据。采用人工模拟降雨与野外径流小区相结合的方法，开展降雨强度为1.5 mm/min条件下玉米全生育期细沟侵蚀阶段地表径流、壤中流和侵蚀泥沙中氮素流失特征的研究。结果表明：细沟侵蚀阶段，玉米各生育期地表径流量、壤中流量和侵蚀产沙量总体表现为随降雨时间延长呈先增加后平稳的变化趋势。地表径流中总氮、可溶性总氮、硝态氮和侵蚀泥沙中总氮流失量总体呈现先增加后平稳的趋势 ...
何淑勤, 宫渊波, 郑子成
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Changes of folate constituents and contents in pakchoi as affected by nitrate to ammonium ratio in nutrient solution under hydroponic conditions. [PDF]
J Zhejiang Univ Sci BZhu Y, Cheng W, Ni Y, Ni W.
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[Determination of eight per- and polyfluoroalkyl substances in seawater using dispersive membrane extraction-ultra-high performance liquid chromatography-tandem mass spectrometry]. [PDF]
Se PuRen Z +5 more
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[Determination of 35 pyrrolizidine alkaloids in dried tea by ultra-high performance liquid chromatography- triple quadrupole mass spectrometry]. [PDF]
Se PuDong L +6 more
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[Determination of vitamin A and vitamin E in human tear by liquid chromatography-tandem mass spectrometry and analysis of their relationship with dry eye]. [PDF]
Se PuLuo BB, Jiao JR, Bai J, Liu XY.
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[Determination of <i>N</i>-（1，3-dimethylbutyl）-<i>N'</i>-phenyl-<i>p</i>-phenylenediamine-quinone in urine and dust by ultra performance liquid chromatography-tandem mass spectrometry]. [PDF]
Se PuLu ZL, Deng FF, Bai ZJ, Peng RF, Tan L.
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[Determination of 17 bisphenol compounds in human urine by solid supported liquid-liquid extraction-ultra-high performance liquid chromatography-tandem mass spectrometry]. [PDF]
Se PuJin Y +6 more
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