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| 应用~(15)N示踪研究毛白杨苗木对不同形态氮素的吸收及分配 | |
| 引用本文： | 董雯怡,聂立水,李吉跃,沈应柏,张志毅.应用~(15)N示踪研究毛白杨苗木对不同形态氮素的吸收及分配[J].北京林业大学学报,2009,31(4). |
| 作者姓名： | 董雯怡 聂立水 李吉跃 沈应柏 张志毅 |
| 作者单位： | 1. 北京林业大学水土保持与荒漠化防治教育部重点实验室 2. 北京林业大学省部共建森林培育与保护教育部重点实验室;华南农业大学林学院 3. 北京林业大学生物科学与技术学院 4. 北京林业大学林木育种国家工程实验室,林木花卉遗传育种教育部重点实验室 |
| 摘 要： | 为探讨毛白杨苗木对不同形态氮素的吸收、分配及利用特性,以毛白杨新无性系83号插条苗为试材,于2007年3—9月在北京林业大学苗圃,应用15N示踪技术测定在相同施氮量下毛白杨苗木对硝态氮(NO3-15N)和铵态氮(NH4-15N)的吸收率、利用率及分配率等指标。结果表明:①施肥后28 d,苗木对两种氮肥的吸收利用达到最大值,其中,标记NO3-15N肥吸收率为0.36 g/株,利用率达35.98%;标记NH4-15N肥吸收率为0.15 g/株,利用率为14.53%。②苗木NO3-15N肥平均利用率(19.75%)约为NH4-15N肥(7.95%)的2.5倍。③施肥后各个时期,全株的NO3-15N肥Ndff值均显著大于NH4-15N肥。各器官对NO3-15N肥的征调能力明显高于NH4-15N肥,茎对肥料征调的竞争能力最强,其次为叶和根。④氮素分配率在各器官中差异显著(P<0.05),总体趋势为叶>根>茎。叶中NO3-15N的分配率均高于NH4-15N,根中储存的氮素主要供地上部分生长所需,总体呈逐渐下降的趋势,茎是氮素贮藏的"临时库",苗木主要通过茎将吸收的氮素输送到叶等生长旺盛的部位。 |
| 关 键 词： | 毛白杨 硝态氮 铵态氮 吸收率 氮肥利用率 来自肥料氮的百分率(Ndff) 分配率 |
Effects of nitrogen forms on the absorption and distribution of nitrogen in Populus tomentosa seedlings using the technique of ~(15)N tracing |
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| DONG Wen-yi,NIE Li-shui,LI Ji-yue,SHEN Ying-bai,ZHANG Zhi-yi.Effects of nitrogen forms on the absorption and distribution of nitrogen in Populus tomentosa seedlings using the technique of ~(15)N tracing[J].Journal of Beijing Forestry University,2009,31(4). | |
| Authors: | DONG Wen-yi NIE Li-shui LI Ji-yue SHEN Ying-bai ZHANG Zhi-yi |
| Institution: | DONG Wen-yi~1,NIE Li-shui~1,LI Ji-yue~(2,5),SHEN Ying-bai~3,ZHANG Zhi-yi~4.1 Key Laboratory of Soil , Water Conservation & Desertification Combating of Ministry of Education,Beijing Forestry University,100083,P.R.China,2 Key Laboratory for Silviculture , Conservation of Ministry of Education,3 College of Biological Sciences , Biotechnology,4 National Engineering Laboratory for Tree Breeding,Key Laboratory for Ge... |
| Abstract: | In order to explore the characteristics of absorption,utilization and distribution of nitrogen,with clone 83 of Populus tomentosa seedlings as materials,the stable isotope~(15)N tracer was used to measure the absorption,nitrogen use efficiency(NUE) and distribution rate under the same nitrogen (N) input treatment from March to September in 2007 in the Nursery of Beijing Forestry University. The results indicated that:1) the rates of absorption and NUE for NO_3-~(15)N and NH_4-~(15)N fertilizers reached the ... |
| Keywords: | Populus tomentosa NO_3-~(15)N NH_4-~(15)N absorption rate nitrogen use efficiency percent of nitrogen derived from fertilizer (Ndff) distribution rate |
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