火烧对草地土壤氮总矿化、硝化及无机氮消耗速率的影响

应用生态学报 ›› 2003, Vol. ›› Issue (2): 223-226.

火烧对草地土壤氮总矿化、硝化及无机氮消耗速率的影响

李玉中¹, 祝廷成², 李建东², 周道玮²

1. 中国农业科学院农业气象研究所, 北京 100081;
2. 东北师范大学草地研究所, 长春 130024

收稿日期:2000-08-31 修回日期:2001-07-09 出版日期:2003-02-15
通讯作者: 李玉中,男,1964年生,博士,副研究员,主要从事草地生态学、草坪生态、农业减灾研究,发表论文多篇.E-mail:Leeyz@cja.org.cn.
基金资助:
国家自然科学基金国际合作项目(93890091);国家高技术研究发展计划资助项目(2001AA242041)

Effect of prescribed burning on grassland nitrogen gross mineralization and nitrification

LI Yuzhong¹, ZHU Tingcheng², LI Jiandong², ZHOU Daowei ²

1. AgrometeorologyInstitute, Chinese Academy of Agricultural Sciences, Beijing 100081, China;
2. GrasslandInstitute, Northeast Normal University, Changchun 130024, China

Received:2000-08-31 Revised:2001-07-09 Online:2003-02-15

摘要/Abstract

摘要： 采用同位素¹⁵N库稀释技术结合扰动较小的管型取样法,测定了羊草草地火烧区与未烧区不同季节土壤氮的总矿化速率、总硝化速率、无机氮消耗速率.结果表明,火烧地的氮总矿化与硝化速率在牧草返青后的4、5月份均高于未烧地,7月份差异不显著,到生长季末的9月份又低于未烧地;火烧地NH₄⁺-N的消耗速率7月份以前均高于未烧地,9月份低于未烧地,NO₃^--N的消耗4、5份火烧地要高于未烧地,7、9月份又低于未烧地;火烧地土壤NH₄⁺-N含量在4、5和7月份均高于未烧地,9月份基本没有差别,而NO₃^--N在4、5月份无大差别,7、9月份高于未烧地.

Abstract: The seasonal dynamics of nitrogen gross mineralization, nitrification,and mineral nitrogen consumption rates in burned and unburned Leymus chinensis grasslands were studied with ¹⁵N pool dilution technique . The results indicated that the gross mineralization and nitrification rates in burned area were higher than those in unburned area in April and May, and lower than those in unburned area in September. NH₄⁺-N consumption rates were higher than unburned area in April and May, and lower in September. NO₃^--N consumption rates were higher than control in April and May, and lower than control in July and September. The NH₄⁺-N concentrations were higher in burned area in April, May and July, and no difference in September.NO₃^--N concentrations were no difference between burned and unburned areas in April and May, and higher in burned areas in July and September.

中图分类号:

S154.1

李玉中, 祝廷成, 李建东, 周道玮. 火烧对草地土壤氮总矿化、硝化及无机氮消耗速率的影响[J]. 应用生态学报, 2003, (2): 223-226.

LI Yuzhong, ZHU Tingcheng, LI Jiandong, ZHOU Daowei . Effect of prescribed burning on grassland nitrogen gross mineralization and nitrification[J]. Chinese Journal of Applied Ecology, 2003, (2): 223-226.

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