Application of ((NH4)-N-15)(2)SO4 to study N dynamics in hoop pine plantation and adjacent native forest of subtropical Australia: the effects of injection depth and litter addition
文献类型：期刊论文
| 作者 | Pan, KW ; Xu, ZH ; Blumfield, TJ ; Tutua, S ; Lu, MX |
| 刊名 | JOURNAL OF SOILS AND SEDIMENTS
 |
| 出版日期 | 2009 |
| 卷号 | 9期号:6页码:515_525 |
| 关键词 | Hoop pine In situ N mineralization Injection depth Litter addition Mineral N-15 Native forest |
| ISSN号 | 1439-0108 |
| 通讯作者 | Pan, KW, Chinese Acad Sci, Chengdu Inst Biol, Chengdu 610041, Peoples R China. |
| 中文摘要 | Hoop pine (Araucaria cunninghamii) is a nitrogen (N)-demanding native Australian softwood plantation species. Litter quality and its effects on soil mineral N and N-15 transformations have not been well studied in the hoop pine plantation and adjacent native forest. The present study was conducted to determine the impact of N-15 injection depth and litter additions on the dynamics and fate of mineral N-15 and also to compare the difference in litter quality, N-15 dynamics, and fate between the hoop pine plantation (HP) and the adjacent native forest (NF). The experiments were done in the Yarraman State Forest (26A degrees 52' S, 151A degrees 51' E), southeastern Queensland. Materials of litter addition were prepared on the basis of ten random samples of litters taken from the NF and HP sites using a 1 x 1-m quadrat. Litter additions were defined as: SL represented the average condition of forest floor in the forest ecosystems and DL represented the double average amount of litters in the forest ecosystem. Experiment 1 covered 2 forest types (NF and HP) x 3 litter rates (nil litter, SL, and DL) x 3 N-15 injection depths (0, 2.5, and 5.0 cm). Experiment 2 included 2 forest types (NF and HP) x 2 litter rates (nil litter and SL) x 3 injection depths (0, 2.5, and 5.0 cm) of distilled water. The in situ core incubation method was used with an incubation period of 28 days. The isotope ratio of mineral N or/and total N (soil and litter) were analyzed using an isotope ratio mass spectrometer with a Eurovector elemental analyzer (Isoprime-EuroEA 3000). Total N and delta N-15 were significantly higher, and C/N ratios and delta C-13 were significantly lower in the NF litters than in the HP litters. The NF litters had significantly lower total N-15 and total N-15 recovery than the HP litters after N-15 addition. Litter addition had no significant effect on mineral N-15 transformations and delta N-15 in the NF soil, but decreased (NO)-N-15 (3) (-) -N, mineral N-15, and delta N-15 and increased immobilized N-15 in the HP soil. The depth of added (NH)-N-15 (4) (+) significantly altered total N-15, delta N-15, and total N-15 recovery in the litters, whereas it did not influence (NH)-N-15 (4) (+) -N, (NO)-N-15 (3) (-) -N, mineral N-15, or immobilized N-15 in soils in the two forest ecosystems. The NF litters had significantly higher delta N-15 than the HP litters, indicating that the NF soil had a higher rate of nitrification than the HP soil. Higher litter quality in the NF was an important driving force for N cycling to promote strong N dynamics in the NF soil over the HP soil. The HP litters had significantly higher total N-15 than the NF litters after N-15 addition, implying that soil mineral N was relatively deficient in the HP in comparison with the NF. Litters decreased nitrification and increased immobilization in the HP soil, showing forest litters resulted in more N immobilization to prevent the loss of substantial quantities of NO (3) (-) through leaching or denitrification. The depth of N-15 injection did not significantly alter concentrations of (NH)-N-15 (4) (+) -N, (NO)-N-15 (3) (-) -N, mineral N-15, and immobilized N-15 in the NF and HP soils, suggesting that the depth of N-15 injection had no significant influence on the evaluation of soil N transformations. The NF litters had significantly higher total N and delta N-15 and lower C/N ratios and delta C-13 than the HP litters. Mineral N was relatively insufficient in the HP soil relative to the NF soil. The HP litters facilitated more N immobilization in the soil to reduce the loss of substantial quantities of NO (3) (-) through leaching or denitrification. The depth of N-15 added did not significantly alter concentrations of (NH)-N-15 (4) (+) -N, (NO)-N-15 (3) (-) -N, mineral N-15, and immobilized N-15 in the NF and HP soils. The application of N-15 solution by uniform sprinkling onto the soil surface can be used to study in situ field N (including mineral N-15) transformations in the 10-cm depth soils of both forest ecosystems. |
| 学科主题 | Geosciences, Multidisciplinary; Soil Science |
| 收录类别 | SCI |
| 资助信息 | Australian Research Council (ARC) Linkage ; Chinese Academy of Sciences ; Ministry of Science and Technology of China ; Key Laboratory of Mountain Ecological Restoration and Bio-resource Utilization ; Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province |
| 语种 | 英语 |
| 公开日期 | 2011-07-08 |
| 源URL | [http://210.75.237.14/handle/351003/22350]  |
| 专题 | 成都生物研究所_生态研究 |
| 推荐引用方式 GB/T 7714 | Pan, KW,Xu, ZH,Blumfield, TJ,et al. Application of ((NH4)-N-15)(2)SO4 to study N dynamics in hoop pine plantation and adjacent native forest of subtropical Australia: the effects of injection depth and litter addition[J]. JOURNAL OF SOILS AND SEDIMENTS,2009,9(6):515_525. |
| APA | Pan, KW,Xu, ZH,Blumfield, TJ,Tutua, S,&Lu, MX.(2009).Application of ((NH4)-N-15)(2)SO4 to study N dynamics in hoop pine plantation and adjacent native forest of subtropical Australia: the effects of injection depth and litter addition.JOURNAL OF SOILS AND SEDIMENTS,9(6),515_525. |
| MLA | Pan, KW,et al."Application of ((NH4)-N-15)(2)SO4 to study N dynamics in hoop pine plantation and adjacent native forest of subtropical Australia: the effects of injection depth and litter addition".JOURNAL OF SOILS AND SEDIMENTS 9.6(2009):515_525. |
入库方式： OAI收割
来源：成都生物研究所
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