| 四川洪雅几种退耕还林模式土壤有效氮的动态研究 |
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| 引用本文： | 梁剑,张健,杨丁丁. 四川洪雅几种退耕还林模式土壤有效氮的动态研究[J]. 四川农业大学学报, 2005, 23(1): 48-51,65 |
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| 作者姓名： | 梁剑 张健 杨丁丁 |
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| 作者单位： | 四川农业大学,林学园艺学院,四川,雅安,625014;四川农业大学,林学园艺学院,四川,雅安,625014;四川农业大学,林学园艺学院,四川,雅安,625014 |
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| 基金项目： | 国家科技部“十五”重点课题(2001BA606A-06-1)，四川省重点学科建设项目(2003)。 |
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| 摘 要： | 对四川洪雅4种退耕还林模式进行定位研究,分析各退耕还林模式土壤溶液中有效氮的动态变化。结果表明:各模式土壤溶液中,铵态氮(NH4+-N)、硝态氮(NO3--N)和总有效氮(NH4+-N+NO3--N)含量均呈现明显的季节性变化;根据有效氮的变化规律,3～4月是施肥的最佳时期,并以施速效肥为主;就各退耕还林模式土壤溶液中总有效氮含量而言,模式Ⅰ(光皮桦+牛鞭草)2年总有效氮含量的平均值最高,是对土壤供氮能力影响最好的一种模式。
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| 关 键 词： | 退耕还林(草) 定位研究 硝态氮 铵态氮 |
| 文章编号： | 1000-2650(2005)01-0048-04 |
The Dynamic of Soil Available Nitrogen Under Several Patterns of the Coverting Lands into Forests in Hongya, Sichuan |
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| LIANG Jian,ZHANG Jian,YANG Ding-ding. The Dynamic of Soil Available Nitrogen Under Several Patterns of the Coverting Lands into Forests in Hongya, Sichuan[J]. Journal of Sichuan Agricultural University, 2005, 23(1): 48-51,65 |
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| Authors: | LIANG Jian ZHANG Jian YANG Ding-ding |
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| Abstract: | To understand dynamic changes of soil nitrogen under different patterns of the coverting lands into forests, four patterns were chosen as the sampling spots in Hongya,Sichuan during two-year time. NH_4~+-N, NO_3~--N and total available nitrogen exhibit significant seasonal variations. Viewed from the changeable regularity of available nitrogen,a suitable season for fertilization is between March and April. As far as different patterns are concerned, pattern Ⅰ has the highest content. It is the best patterns in supplying nitrogen. |
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| Keywords: | coverting lands into forests (grass) site investigation NO_3~--N NH_4~ -N |
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