| 盆栽和田间条件下土壤15N标记肥料氮的转化 |
| |
| 引用本文： | 程励励,文启孝,李洪.盆栽和田间条件下土壤15N标记肥料氮的转化[J].土壤学报,1989,26(2):124-130. |
| |
| 作者姓名： | 程励励 文启孝 李洪 |
| |
| 作者单位： | 中国科学院南京土壤研究所;中国科学院南京土壤研究所;中国科学院南京土壤研究所 |
| |
| 摘 要： | 利用15N在盆栽条件下研究了铵的矿物固定作用对肥料氮在三种土壤中转化的影响.结果表明,红壤性水稻土不固定肥料铵,但在白土和夹沙土中,56-77%的肥料氮被土壤矿物所固定,这些“新固定”的固定态铵的有效性很高,其中90%以上在30-50天内即被水稻所吸收,或者为微生物所利用转变为生物固定态氮.生物固定态氮对当季作物的有效性远较“新固定”的固定态铵的低.田间微区试验的结果还表明,甚至第二、三季作物吸收的残留肥料氮中,20-86%的氮也系来自固定态铵.作者认为,对具有较强固铵能力的土壤来说,只有了解铵的矿物固定作用,才能正确了解肥料氮的其它转化过程.
|
| 关 键 词： | 土壤^15N标记 氮转化 盆栽 |
TRANSFORMATION OF 15N LABELLED FERTILIZER N IN SOILS UNDER GREENHOUSE AND FIELD CONDITIONS |
| |
| Cheng Lili,Wen Qixiao and Li Hong.TRANSFORMATION OF 15N LABELLED FERTILIZER N IN SOILS UNDER GREENHOUSE AND FIELD CONDITIONS[J].Acta Pedologica Sinica,1989,26(2):124-130. |
| |
| Authors: | Cheng Lili Wen Qixiao and Li Hong |
| |
| Institution: | Instisute of Soil Science, Academia Sinica, Nanjing;Instisute of Soil Science, Academia Sinica, Nanjing;Instisute of Soil Science, Academia Sinica, Nanjing |
| |
| Abstract: | The effect of ammonium fixation on the transformation of N labelled fertilizer N in three soils was studied in a pot experiment. Little fertilizer N was fixed by clay minerals in a paddy soil derived from red earth, while 56-77% of fertilizer N applied was fixed in bleacked paddy soil and calcareous permeable paddy soil. Availability of these "newly" fixed ammonium N was so high that over 90% of it was recovered by rice plant or microorganisms within 30-50 day after the transplantation of rice seedlings. The availability of the biologically immobilized N to the current crop was much less than that of the "newly" fixed ammonium N. In a field microplot experimant conducted on bleached paddy soil, it was found that 20-86% of the residual fertilizer N taken up by the succesive crops (2nd and 3rd crops) was derived from fixed ammonium nitrogen. The authors consider that far soils with fairly strong NH4+-N-fixing capability, only the NH4+-N-fixation by clay minerals and its release are known, can the N immobilization, remineralization be evaluated. |
| |
| Keywords: | |
| 本文献已被 维普 等数据库收录！ |
| 点击此处可从《土壤学报》浏览原始摘要信息 |
| 点击此处可从《土壤学报》下载免费的PDF全文 |
|
