热带亚热带土壤氮素反硝化研究进展

被引:11
作者
续勇波 [1 ]
XU Zhihong [2 ]
蔡祖聪 [3 ]
机构
[1] 云南农业大学烟草学院
[2] Environmental Futures Centre and School of Biomolecular and Physical Sciences, Griffith University,QLD , Australia
[3] 南京师范大学地理科学学院
关键词
反硝化; 环境效应; 氮淋失; 保氮策略; 氧化亚氮;
D O I
10.16258/j.cnki.1674-5906.2014.09.004
中图分类号
S151.9 [土壤分析];
学科分类号
0903 ; 090301 ;
摘要
热带亚热带独特的土壤性质可能使得反硝化机理有别于温带土壤。文章综述了热带亚热带地区土壤氮素生物反硝化的研究进展,试图更好地了解该地区土壤反硝化在全球氮(N)循环以及在全球环境变化和生态系统响应互作中的角色。热带亚热带土壤反硝化强度普遍较温带地区弱,且随着土地利用方式和耕作管理措施的不同而呈现较大的时空变异性。影响土壤水分状况和土壤碳(C)、N转化特性和速率的因素即为区域和农田尺度上的反硝化影响因素。湿润型热带亚热带土壤由于含有丰富的氧化物而致使土壤氧化还原势较高,这也是导致该地区土壤反硝化势较温带地区较低的关键土壤因素之一。然而土壤p H值不是该地区土壤反硝化势较低的主要限制因素。有机C矿化过程较土壤全氮含量和土壤C/N比在决定湿润型亚热带土壤反硝化势方面更为重要。愈来愈多的证据表明热带亚热带土壤反硝化的生态环境效应不同于温带地区,热带亚热带地区土壤反硝化对全球变暖的贡献应综合考虑其对其它温室气体(如CH4,CO2)排放和氮沉降的影响。热带亚热带土壤生态系统具有一些防止土壤氮素反硝化损失的机制和保氮策略。然而,热带亚热带生态系统对全球变化的响应机制及其生物地球化学调控机制仍然不清楚,这些研究对于反硝化和其它同时发生的氮转化过程模型的精确构建至关重要。
引用
收藏
页码:1557 / 1566
页数:10
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