| 日本常规耕作和有机耕作(翻耕与免耕)农田的动物区系(螨和线蚓)比较 |
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| 引用本文： | M. FUJITA,S. FUJIYAMA. 日本常规耕作和有机耕作(翻耕与免耕)农田的动物区系(螨和线蚓)比较[J]. 土壤圈, 2001, 11(1): 11-20 |
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| 作者姓名： | M. FUJITA S. FUJIYAMA |
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| 作者单位： | InstituteofSoilScience,theChineseAcademyofSciences,P.O.Box821,Nanjing210008（China） |
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| 基金项目： | *1Project (No.39790100) supported by the National Natural science Foundation of China. |
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| 摘 要： | Nitrogen forms of humic substances from a subalpine meadow soil,a lateritic red soil and a weathered cola and the effect of acid hydrolysis on N structures of soil humic substances were studied by using ^15N cross-polarization magic angle spinning nuclear magnetic resonance(CPMAS NMR) spectroscopy,Of the detectable ^15N-signal intensity in the spectra of soil humic substances 71%-79% may be attributed to amide groups ,10%-18% to aromatic/aliphatic amines and 6%-11% to indole-and pyrrole-like N.Whereas in the spectrum of the fulvic acid from weathered coal 46%,at least,of the total ^15N-signal intensity might be assigned to pyrrole-like N,14% to aromatic/aliphatic amines,and the reamining intensities could not be assigned with certainty,Data on nonhydrolyzable reside of protein-sugar mixture and a ^15N-labelled soil fulvic acid confirm the formation of nonhydrolyzable heterocyclic N during acid hydrolysis.
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| 关 键 词： | 腐殖质 土壤矿物 风化煤 光谱学 赋存形态 氮 |
Comparison of soil fauna (oribatids and enchytraeids) between conventional and organic (tillage and no-tillage practices) farming crop fields in Japan |
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| M. FUJITA and S. FUJIYAMA. Comparison of soil fauna (oribatids and enchytraeids) between conventional and organic (tillage and no-tillage practices) farming crop fields in Japan[J]. Pedosphere, 2001, 11(1): 11-20 |
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| Authors: | M. FUJITA and S. FUJIYAMA |
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| Affiliation: | Institute of Soil Science, the Chinese Academy of Sciences, P.O. Box 821, Nanjing 210008 (China);Institute of Soil Science, the Chinese Academy of Sciences, P.O. Box 821, Nanjing 210008 (China);Institute of Soil Science, the Chinese Academy of Sciences, P.O. Box 821, Nanjing 210008 (China) |
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| Abstract: | Nitrogen forms of humic substances from a subalpine meadow soil,a lateritic red soil and a weathered cola and the effect of acid hydrolysis on N structures of soil humic substances were studied by using ^15N cross-polarization magic angle spinning nuclear magnetic resonance(CPMAS NMR) spectroscopy,Of the detectable ^15N-signal intensity in the spectra of soil humic substances 71%-79% may be attributed to amide groups ,10%-18% to aromatic/aliphatic amines and 6%-11% to indole-and pyrrole-like N.Whereas in the spectrum of the fulvic acid from weathered coal 46%,at least,of the total ^15N-signal intensity might be assigned to pyrrole-like N,14% to aromatic/aliphatic amines,and the reamining intensities could not be assigned with certainty,Data on nonhydrolyzable reside of protein-sugar mixture and a ^15N-labelled soil fulvic acid confirm the formation of nonhydrolyzable heterocyclic N during acid hydrolysis. |
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| Keywords: | forms of N humic substances mineral soils 15N CPMAS NMR weathered coal |
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