Impacts of Vegetation Types on Soil Nitrogen in Ziwuling Forest Region
, 2002 以黄土丘陵沟壑区的子午岭次生林区主要植被类型为对象,研究了植被类型对土壤全氮的影响作用。结果表明,长期草地(白羊草地和茭蒿草地)、灌木林和乔木林地表层土壤(0—5cm)的全氮含量为坡耕地表层土壤全氮含量的1.4～2.5倍。长期草地和乔木林地表层土壤(0—5cm)全氮的含量相近,高于灌木林地及恢复草地表层土壤的全氮含量。在林草植被下,表层土壤的全氮含量明显高于下层土壤的含量,土壤剖面中全氮的含量随着土层深度的增加而表现为下降趋势。与坡耕地相比,草、灌木和乔木可以分别提高0 ...
吴金水, 王百群, 赵世伟
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[Serum levels of polycyclic aromatic hydrocarbons and health risk assessment among children and adolescents]. [PDF]
Se PuWang LP +7 more
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, 2013 丹江水源区的水环境质量对南水北调中线工程的供水安全具有重要意义。本文在 丹江鹦鹉沟小流域进行水质监测和土壤采集分析的基础上，运用地统计学方法、分形 理论、土壤侵蚀预报模型和水文学方法等对小流域土壤氮素空间变异特征和径流-泥 沙-养分流失规律进行研究，以期为水源区保护和清洁小流域建设提供依据。本研究 取得的主要结论如下： （1）流域土壤全氮含量随土壤深度的增加而降低，不同土地利用下 0-40 cm 每 平方米土壤全氮含量表现为林地>农地>草地。不同土层间土壤全氮含量存在极显著 差异（P<
徐 国
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[Progress in preparation of plant biomass-derived biochar and application in pesticide residues field]. [PDF]
Se Pu, 2022 Zhang X, Zhen D, Liu F, Peng Q, Wang Z.
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[Determination of 26 perfluorinated and polyfluoroalkyl compounds in human serum by solid-phase extraction-high performance liquid chromatography-tandem mass spectrometry]. [PDF]
Se PuYue YX +9 more
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[Determination of 10 carbamate pesticide residues in liquid milk by ultra performance liquid chromatography-tandem mass spectrometry with pass-through solid-phase extraction purification]. [PDF]
Se Pu, 2023 Yue C +6 more
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Vertical variations of soil moisture and total nitrogen in small catchment on Loess Plateau
, 2010 为了研究黄土高原土壤中水分及全氮垂直分布及变异情况,对陕北神木县六道沟小流域中苜蓿地、荒草地、农地、柠条地以及油松地5种不同植被类型下0～800cm土层中土壤含水率和土壤全氮进行了测定和分析。土壤含水率在垂直方向上呈现出干湿交替的层状分布。植被类型影响土壤水分含量的垂直剖面分布;各植被类型下相对高湿层和低湿层出现的深度不同;不同深度土层平均土壤含水率不同。农地及退耕荒草地土壤水分涵养较好,垂直方向上含水率变化较大;人工植被苜蓿、柠条消耗土壤水分较多,土壤含水率变化相对平缓 ...
刘志鹏, 邵明安
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[Research progress in material preparation and application of magnetism-enhanced in-tube solid-phase microextraction]. [PDF]
Se PuLuo YN +7 more
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[Toxicity of lunar dust simulant exposure via the digestive system: Microbiota dysbiosis and multi-organ injury]. [PDF]
Zhong Nan Da Xue Xue Bao Yi Xue BanChen Y +8 more
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[Simultaneous determination of six nitroaromatic compounds and three anions in environmental matrices using a liquid chromatography-ion chromatography coupled system]. [PDF]
Se PuLei J, Zheng H, Liu L, Li W.
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