Effects of N Addition on Different Organic Carbon Fractions of Soil Growing Bothriochloa ischaemum

doi:10.11733/j.issn.1007-0435.2016.05.002

Acta Agrestia Sinica ›› 2016, Vol. 24 ›› Issue (5): 939-946.DOI: 10.11733/j.issn.1007-0435.2016.05.002

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Effects of N Addition on Different Organic Carbon Fractions of Soil Growing Bothriochloa ischaemum

LIU Hong-fei¹, XUE Sha², WANG Guo-liang², XIN Qi³, LIU Guo-bin⁴

1. College of Forestry, Northwest A & F University, Yangling, Shaanxi Province 712100, China;
2. Institute of Soil and Water Conservation Northwest A & F University, Yangling, Shaanxi Province 712100, China;
3. College of Resources and Environment, Northwest A & F University, Yangling, Shaanxi Province 712100, China;
4. Institute of Soil and Water Conservation, Chinese Academy of Science and Ministry of Water Resources, Yangling, Shaanxi Province 712100, China

Received:2015-08-18 Revised:2016-04-12 Online:2016-10-15 Published:2017-01-13

氮添加对白羊草土壤不同碳组分的影响

刘鸿飞¹, 薛萐², 王国梁², 辛奇³, 刘国彬⁴

1. 西北农林科技大学林学院, 陕西杨凌 712100;
2. 西北农林科技大学水土保持研究所, 陕西杨凌 712100;
3. 西北农林科技大学资源环境学院, 陕西杨凌 712100;
4. 中国科学院水利部水土保持研究所, 陕西杨凌 712100

通讯作者: 刘国彬
作者简介:刘鸿飞(1992-),男,河南信阳人,博士研究生,主要从事恢复生态学等方面的研究,E-mail:liuhongfei@nwsuaf.edu.cn
基金资助:
中科院西部青年学者项目（XAB2015A05）；国家自然科学基金（41371510，41371508，41471438）资助

Abstract

Abstract:

Atmospheric N deposition has become a global environmental problem, in order to examine the effects of N deposition on soil organic carbon fractions in grassland, a stimulated N deposition experiment was conducted in the Institute of Soil and Water Conservation in July 2013 by building Bothriochloa ischaemum community plots. The four treatments selected for present experiment were:0 g·m^-2·year^-1 (N0),2.5 g·m^-2·year^-1 (N2.5),5.0 g·m^-2·year^-1 (N5.0) and 10 g·m^-2·year^-1 (N10.0). The results showed that low-level(N2.5) N addition increased total soil organic carbon (TOC) contents significantly while high-level(N10.0) N addition decreased soil TOC contents. N addition decreased the first (C1) fraction of OC, C1/TOC, C_active/TOC and lability index, and increased the third (C3) fraction of OC and C_passive/TOC. Moreover, at N addition level of N5.0 and N10.0, C_passive/TOC tended to reach 50%. In conclusion, the soil C_active and C_passive tended to reach a balance with N addition, and soil carbon pool tended to be more stable.

Key words: Nitrogen deposition, Bothriochloa ischaemum, Soil total organic carbon, Soil oxidizable organic carbon fractions

摘要：

大气氮沉降已经成为全球性的环境问题，为更好地了解氮沉降增加对草地土壤质量的影响，2013年7月，以白羊草（Bothrichoa ishaemum）群落为研究对象，通过人工构建白羊草种群小区，在中国科学院水土保持研究所人工干旱大厅进行模拟氮沉降的控制试验。本试验设置了裸地（LD）、对照（N0）和3个氮（尿素）添加处理，依次为2.5 g·m^-2·year^-1（N2.5），5.0 g·m^-2·year^-1（N5.0）和10 g·m^-2·year^-1（N10.0），探讨了氮沉降对白羊草群落土壤总有机碳（TOC）和易氧化有机碳（OC）各组分的影响。结果表明，低浓度（N2.5）氮添加提高了白羊草土壤TOC含量，高浓度（N10.0）氮添加降低了土壤TOC含量；氮添加降低了白羊草土壤C_active（活性碳组分）/TOC比例，增加了C_passive（惰性碳组分）/TOC比例；在N5.0和N10.0氮添加水平，C_passive/TOC趋向于达到50%；土壤活性系数随氮添加浓度的增加而降低。综上所述，随着氮添加浓度增加土壤C_active与C_passive含量趋于平衡，土壤碳库更加趋于稳定。

关键词: 氮沉降, 白羊草, 土壤有机碳, 土壤易氧化有机碳组分

CLC Number:

LIU Hong-fei, XUE Sha, WANG Guo-liang, XIN Qi, LIU Guo-bin. Effects of N Addition on Different Organic Carbon Fractions of Soil Growing Bothriochloa ischaemum[J]. Acta Agrestia Sinica, 2016, 24(5): 939-946.

刘鸿飞, 薛萐, 王国梁, 辛奇, 刘国彬. 氮添加对白羊草土壤不同碳组分的影响[J]. 草地学报, 2016, 24(5): 939-946.

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Effects of N Addition on Different Organic Carbon Fractions of Soil Growing Bothriochloa ischaemum

氮添加对白羊草土壤不同碳组分的影响

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