| 中国湖南省主要水稻土类型的氨固定 |
| |
| 作者姓名： | ZHANG Yang-Zhu LIAO Ji-Pei SUN Yu-Huan FENG Yue-Hu HUANG Yun-Xiang |
| |
| 作者单位： | College of Resources and Environment, Hunan Agricultural University, Changsha 410128 China |
| |
| 摘 要： | The contents, affecting factors, seasonal changes and availability of fixed ammonium in major types ofpaddy soils derived from different parent materials in Hunan Province, China, were studied using the Silva-Bremner method by laboratory and pot experiments. Results showed that the content of fixed ammoniumin the plough horizons ranged from 88.3 mg kg-1 to 388.1 mg kg-1, with 273.2 ± 77.7 mg kg-1 on average,accounting for 11.2% of total soil N on average. Content of fixed ammonium decreased in the order of newlylacustrine clayey paddy soil ＞ alluvial sandy paddy soil ＞ purple clayey paddy soil ＞ newly alluvial sandypaddy soil ＞ yellow clayey paddy soil ＞ reddish-yellow clayey paddy soil ＞ granitic sandy paddy soil. Therewere four distribution patterns of fixed ammonium in the profiles to 1-m depth, i.e., increase with the depth,decrease with increasing depth, no distinct change with the depth, and abrupt increase or decrease in somehorizon. Percentage of fixed ammonium in total N increased with the depth in most of the soils. Fixationof NH4+ by soil was higher at 30 ℃ than at 20 ℃ and 40 ℃, and continuous submergence benefited thefixation of NH4+ in newly alluvial sandy paddy soil, purple clayey paddy soil and alluvial sandy paddy soil,while alternating wetting and drying contributed to the fixation of NH4+ in yellow clayey paddy soil mostly.Fixed ammonium content in the test paddy soils was significantly correlated with ＜ 0.01 mm clay content(P ＜ 0.05), but not with ＜ 0.001 mm clay content, total N, organic N and organic matter. Fixed ammoniumcontent varied with rice growth stages. Application of N fertilizer promoted fixation of NH4+ by soil, and Nuptake by rice plant promoted release of fixed ammonium from the soil. Recently fixed ammonium in paddysoil after N fertilizer application was nearly 100% available to rice plant, while native fixed ammonium wasonly partly available, varying with the soil type and rice type.
|
| 关 键 词： | 中国 湖南 影响因素 生物利用率 水稻土 土壤学 固化铵 |
Fixed ammonium in major types of paddy soils in Hunan province, China |
| |
| ZHANG Yang-Zhu,LIAO Ji-Pei,SUN Yu-Huan,FENG Yue-Hu,HUANG Yun-Xiang.Fixed ammonium in major types of paddy soils in Hunan province, China[J].Pedosphere,2003,13(3):199-208. |
| |
| Authors: | ZHANG Yang-Zhu LIAO Ji-Pei SUN Yu-Huan FENG Yue-Hua and HUANG Yun-Xiang |
| |
| Institution: | College of Resources and Environment, Hunan Agricultural University, Changsha 410128 (China);College of Resources and Environment, Hunan Agricultural University, Changsha 410128 (China);College of Resources and Environment, Hunan Agricultural University, Changsha 410128 (China);College of Resources and Environment, Hunan Agricultural University, Changsha 410128 (China);College of Resources and Environment, Hunan Agricultural University, Changsha 410128 (China) |
| |
| Abstract: | |
| |
| Keywords: | affecting factors bioavailability fixed ammonium Hunan Province paddy soil |
| 本文献已被 万方数据 等数据库收录！ |
| 点击此处可从《土壤圈》浏览原始摘要信息 |
| 点击此处可从《土壤圈》下载免费的PDF全文 |
|
