| 旱地土壤的供氮潜力 |
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| 引用本文： | 丘华昌,陈家宙.旱地土壤的供氮潜力[J].植物营养与肥料学报,1995,1(2):33-39. |
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| 作者姓名： | 丘华昌 陈家宙 |
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| 作者单位： | 1.华中农业大学土化系 430070 |
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| 摘 要： | 对潮土、黄褐土、黄棕壤和红壤旱地的供氮潜力进行研究的结果表明,矿化势(No)变化于60340mgkg-1之间,矿化速率常数(K)0.00556-0,01280d-1,矿化势(No)、矿化速率常数(K)和矿化量(Nt)与土壤供氮量均呈显著相关,说明No、Nt和K是土壤供氮潜力的重要参数。这些参数与土壤全氮、有机质、有机氮、易分解有机质、C/N等土壤组成性质密切相关。测定表明,供试土壤粘土矿物多以2:1型为主,土壤固定态铵多在100mgkg-1以上,有部分可重新释放出来,是研究土壤供氮潜力时不容忽视的因素。
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| 关 键 词： | 旱地土壤 土壤供氮潜力 氮矿化势 固定态铵 |
NITROGEN SUPPLY POTENTIALITY OF UPLAND SOILS |
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| Qiu Huachang Chen Jiazhou.NITROGEN SUPPLY POTENTIALITY OF UPLAND SOILS[J].Plant Nutrition and Fertilizer Science,1995,1(2):33-39. |
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| Authors: | Qiu Huachang Chen Jiazhou |
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| Institution: | 1.Huazhong Agricultural University. 430070 |
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| Abstract: | Nitrogen supply potentiality of fluvo-aquic soils, yellow-cinamon soils, yellow-brown soils and red soils was studied. Results indicated that mineralization potential (No) of soils range from 60-340mgkg-1,and the mineralization rate constant(K) range from 0. 00556-0. 01280d-1.There was a good correlation between No, K, Nt and the capacity of soil nitrogen supply, which revealed that No, K and Nt could be used as parameters of soil nitrogen supply potentiality. These parameters were close to the corresponding soil composition properties, such as soil total N, OM, Organic N, easyly-oxidzed OM, C/N ratio. The results also showed that the clay mineral composition for most of the examined soils was mainly 2: 1 type minerals, and the amount of fixed ammonium was generally more than 100 mgKg-1. This fixed ammonium could also be released in part, therefore, it should be pay attention to in the study of soil nitrogen supply potentiality. |
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