| 镉、铅、锌对红壤微生物生物量的影响 |
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| 作者姓名： | K. S. KHAN XIE Zheng-Miao HUANG Chang-Yong |
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| 作者单位： | [1]InstituteofSoilScience,theChineseAcademyofSciences,Nanjing210008（CHina） [2]NanjingUniversityofScienceand,theChineseAcademyofSciences,Nanjing210008（CHina） |
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| 摘 要： | Nitrogen(N)losses from ammonium bicarbonate or urea applied to wheat and then followed immediately by irrigation were investigated.Ammonia volatilization was determined by a micrometeorological method (ammonia sampler),total N loss was estimated by the ^15N mass balance method ,and denitrification loss was measured by the diference method(calculated from the difference between the total N loss and ammonia loss) and a direct method (measuring the emission of (N2 N2O)-^15N).Total ammonia losses from ammonium bicarbonate and urea in 33 days were 8.7% and 0.9% of the applied nitrogen ,respectively.The corresponding total N losses were 21.6% and 29.5%,Apparent denitrification losses(by the difference method) were rather high,being 12.9% from ammonium bicarbonate and 28.6% from urea .However,no emission of (N2 N2O)-^15N was detected using the direct method.
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| 关 键 词： | 氨挥发 脱氮作用 氮肥 小麦 华北地区 气态 氮流失 钙土 |
Effects of cadmium, lead, and zinc on size of microbial biomass in red soil |
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| K. S. KHAN,XIE Zheng-Miao,HUANG Chang-Yong.Effects of cadmium, lead, and zinc on size of microbial biomass in red soil[J].Pedosphere,1998,8(1):27-32. |
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| Authors: | K S KHAN XIE Zheng-Miao and HUANG Chang-Yong |
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| Institution: | College of Natural Resources and Environmental Sciences, Zhejiang Agricultural University, Hangzhou 310029 (China);College of Natural Resources and Environmental Sciences, Zhejiang Agricultural University, Hangzhou 310029 (China);College of Natural Resources and Environmental Sciences, Zhejiang Agricultural University, Hangzhou 310029 (China) |
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| Abstract: | Nitrogen(N)losses from ammonium bicarbonate or urea applied to wheat and then followed immediately by irrigation were investigated.Ammonia volatilization was determined by a micrometeorological method (ammonia sampler),total N loss was estimated by the ^15N mass balance method ,and denitrification loss was measured by the diference method(calculated from the difference between the total N loss and ammonia loss) and a direct method (measuring the emission of (N2 N2O)-^15N).Total ammonia losses from ammonium bicarbonate and urea in 33 days were 8.7% and 0.9% of the applied nitrogen ,respectively.The corresponding total N losses were 21.6% and 29.5%,Apparent denitrification losses(by the difference method) were rather high,being 12.9% from ammonium bicarbonate and 28.6% from urea .However,no emission of (N2 N2O)-^15N was detected using the direct method. |
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| Keywords: | cadmium lead microbial biomass red soil zinc |
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