当前位置: 首页 > 文章 > 温度和土壤类型对氮素矿化的影响 植物营养与肥料学报 2011,17 (3) 583-591
Position: Home > Articles > Effects of temperature and soil type on nitrogen mineralization Journal of Plant Nutrition and Fertilizers 2011,17 (3) 583-591

温度和土壤类型对氮素矿化的影响

作  者:
王帘里;孙波
单  位:
中国科学院南京土壤研究所;中国科学院研究生院
关键词:
氮矿化;温度;一级动力学模型;黑土;潮土;红壤
摘  要:
采用短期(15 d)室内好气培养方法,研究我国东部三类主要旱地土壤(黑土、潮土和红壤)有机氮矿化对温度(15~30℃)的响应及其影响因素。结果表明,土壤累积净矿化氮量的顺序为黑土>潮土>红壤,其中高有机质土壤大于低有机质土壤。黑土累积净矿化氮量随温度升高而增加,但潮土和红壤在25℃以上表现出持平和下降趋势。土壤矿质氮含量变化与培养积温(培养温度×培养时间)的平方根表现出线性正相关关系,总体上高有机质含量土壤氮矿化对温度的敏感性强。基于一级动力学方程的模拟,除黑土的土壤潜在矿化氮库(N0)随温度增加而提高外,其余土壤的N0以及所有土壤的氮矿化速率常数(k0)随温度表现出抛物线型的变化;总体上,土壤氮矿化的适宜温度为20~25℃。在15~20℃内,k0随温度升高而增加,其温度敏感性顺序是红壤>黑土>潮土;在20~30℃内,k0随温度升高而下降,其温度敏感性顺序为黑土>红壤>潮土。土壤有机质和全氮显著影响累积矿化氮含量,而土壤C/N比显著影响氮矿化速率常数。
译  名:
Effects of temperature and soil type on nitrogen mineralization
作  者:
WANG Lian-li1,2,SUN Bo1(1 Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008,China;2 Graduate School of Chinese Academy of Sciences,Beijing 100049,China)
关键词:
N mineralization;temperature;first-order rate equation;phaeozem;cambisol;acrisol
摘  要:
Variation between soils in the response to temperature of nitrogen(N) mineralization was investigated in laboratory incubations.Three types of soils with different soil organic matter contents including black soil(phaeozem),fluvo-aquic soil(cambisol) and red soil(acrisol) were sampled from farmlands of different regional climates of east China.The soils were incubated at 15,20,25 and 30℃ and constant moisture conditions and the accumulation of soil extractable NO-3-N and NH+4-N was followed for 15 days.First-order rate equation was fitted to data to estimate net mineralization rate constants(k0) and the size of the mineralizable part of native soil N(N0).The accumulated N mineralization increased by the sequence of red soilblack soil>fluvo-aquic soil for 15-20℃ and a sequence of black soil> red soil>fluvo-aquic soil for 20-30℃.Soil net N mineralization was significantly affected by soil organic matter and total N,and rate constant(k0) by soil C/N ratio.

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