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Variations in nitrogen isotopic values among various particle-sized fractions in modern soil in northwestern China

ISSN号：2096-0956
期刊名称：《中国地球化学学报：英文版》
时间：0
分类：P642.13[天文地球—工程地质学;天文地球—地质矿产勘探;天文地球—地质学] X171.1[环境科学与工程—环境科学]
作者机构：[1]State Key Laboratory of Loess and Quaternary Geology, lEE, CAS, Xi'an 710075, China, [2]School of Human Settlement and Civil Engineering, Xi'an Jiaotong University, Xi 'an 710049, China, [3]School of Environmental Science and Engineering, Chang 'an University, Xi'an 710054, China, [4]Department of Earth Sciences, Dartmouth College, Hanover, NH 03755, USA
相关基金：Acknowledgements This study was supported by the National Natural Science Foundation of China （Grant Nos. 40673012, 40599422, 40523002）, the National Key Funds of China （No. 2004CB720200）, and the Foundation for Excellent Doctoral Dissertation Awards of the People＇s Republic of China.

作者： LIU Weiguo[1,2], WANG Zhoufeng[1,3], WANG Zheng[1], FENG Xiahong[4], ZHANG Pu[1]

关键词：稳定氮同位素, 中国西北地区, 现代土壤, 粒子大小, 自然生态系统, 土壤有机质, 颗粒大小, 组分, nitrogen isotope, soil, particle-sized fraction, plant decomposition

中文摘要：

在从植物导出并且在土壤保存了的有机物的稳定的氮同位素的比率是潜在的 tracers 因为在为气候的评估的自然生态系统和贵重物品的氮周期变化。然而，在在表面土壤并且在植物垃圾的同位素的作文从植物垃圾在分解期间处理玷污有机物的氮之间的关系不是理解的井。由使用氮土壤的同位素的分析粒子大小的部分，在植物垃圾之间的氮同位素辨别和在在西北的中国的各种各样的现代生态系统的表面土壤有机物被进行。我们的学习的结果显示那：(1 ) 一般来说，从表面的粒子大小的部分的同位素的作文玷污的氮是不同的，并且 15N 从植物垃圾珍视增加到好土壤有机物；(2 ) 15N 在土壤珍视粒子大小的部分与增加变得更大相对湿度和温度，和在 15N 价值的最大的变化从 5.9 ～ 0.3；并且(3 ) 在控制气候下面，在在植物垃圾和体积土壤有机物之间的 15N 价值(15Nplant 土壤) 的重要的氮同位素差别被观察，与在各种各样的地点的 1.52 ～ 4.75 的价值。我们的结果建议在体积土壤和土壤的粒子大小的部分之间的 15N 价值的比较能在在干旱、半干旱的生态系统从植物把氮的过程转移到土壤上揭示湿度的效果。

英文摘要：

Ratios of stable nitrogen isotopes in organic matter derived from plants and preserved in soil are potential tracers for nitrogen cycles in natural ecosystems and valuable for evaluation of climate change. However, the relationship between nitrogen isotopic compositions in surface soil and in plant litter during the decomposition process from plant litter to soil organic matter is not well understood. By using nitrogen isotopic analysis of soil particle-sized fractions, nitrogen isotope discrimination between plant litter and surface soil organic matter in various modern ecosystems in northwestern China was conducted. The results of our study indicate that：（1） in general, the nitrogen isotopic compositions of particle-sized fractions from surface soil are different, and δ^15N values increase from plant litter to fine soil organic matter; （2） the δ^15N values in the soil particle-sized fractions become larger with increasing relative humidity and temperature, and the largest variation in the δ^15N values is from -5.9‰ to -0.3‰; and （3） under a controlled climate, significant nitrogen isotope differences in δ^15N values （△δ^15Nplant_soil） between plant litter and bulk soil organic matter were observed, with the values of 1.52 to 4.75 at various sites. Our results suggested that comparisons of △δ^15N values between effect of humidity on transferring process of nitrogen bulk soil and the particle-sized fractions of soil could reveal the from plant to soil in add and semi-add ecosystems.

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