Shuitu Baochi Xuebao, 2006 以浙江省嘉兴市双桥农场的青紫泥水稻田为研究对象，采用大田小区的研究方法，对不同供肥水平下水稻追施尿素后田面水中氮素主要形态的浓度变化进行了动态监测，并从土壤酶学的角度探讨了其氮素转化的深层机制。研究发现．土壤脲酶在稻田田面水氮素转化中起着关键作用，施尿素后3天内田面水中总氮、氨氮的浓度及氨氮／总氮比值达到峰值．且第二次追肥较第一次追肥后峰值低．随后急剧下降。5天后维持在较低的水平，说明施肥后前5天是氮素大量且快速流失的关键时期，其流失以氨氮为主；土壤脲酶活性在第一次追肥后3～5天也出现了明显的增长趋势 ...
李华 +4 more
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[Exercise-induced hyperinsulinism: genetic basis and clinical management]. [PDF]
Zhongguo Dang Dai Er Ke Za ZhiZhang QT, Hou L.
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[Dietary secoisolariciresinol diglucoside alleviates chronic kidney disease in offspring rats caused by maternal trans-fatty acid exposure by regulating the Bcl-2/Bax/caspase-3 signaling axis]. [PDF]
Nan Fang Yi Ke Da Xue Xue BaoMa S, Chen M, Wu T, Zhao W.
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[Performance evaluation of different filtration fractions during daytime continuous renal replacement therapy]. [PDF]
Zhejiang Da Xue Xue Bao Yi Xue BanWang L, Chen Y, Xu G, Xu C.
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[Application and research progress of metal-organic framework materials in skin repair]. [PDF]
Sheng Wu Yi Xue Gong Cheng Xue Za ZhiMa S, Wu W, Liu H, Liu M, Xing F.
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[Performance validation and consistency assessment of three liquid chromatography-tandem mass spectrometry methods for detecting fat-soluble vitamins]. [PDF]
Se PuLi BC +8 more
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[Analysis of influencing factors on secondary olfactory dysfunction in different types of chronic sinusitis]. [PDF]
Lin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za ZhiHan L, Wang J, Qiao X.
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[Research progress on the causes of pain in knee osteoarthritis]. [PDF]
Zhongguo Xiu Fu Chong Jian Wai Ke Za ZhiWei N, Zheng Z.
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Shuitu Baochi Xuebao[目的] 禾豆间作可兼顾生产和生态效益,提高氮素利用效率并减少氮肥污染。目前对不同水分条件下禾豆间作体系氮素利用吸收及转移分配过程尚不清晰。[方法] 通过设置2时段总水量相同但间隔3,5天的不同频次水处理,结合根系分隔(不分隔、尼龙网分隔、塑料板分隔)和氮同位素标记方法,研究间作禾豆牧草的地上生物量、氮素的吸收利用、固氮率和氮转移率。[结果] 间作披碱草的地上生物量、氮含量和氮素累积量相较单作披碱草显著提升,而苜蓿间作相比单作均降低。在总水量持平的情况下 ...
王一帆 +3 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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