지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술대회자료
- 저자정보
- 발행연도
- 2013.5
- 수록면
- 55 - 68 (14page)
이용수
초록· 키워드
오류제보하기
The impact of increased CO₂ and NO<SUB>x</SUB> emissions on soil and tree ring chemistry of Pinus banksiana (jack pine) and Populus tremuloides (trembling aspen, aspen) stands in the Athabasca oil sands region in Alberta, Canada was investigated in watersheds NE7 and SM8. Watershed NE7 was exposed to greater amounts of acid deposition due to its closeness to the mining area. The δ<SUP>15</SUP>N in the forest floor was lower (p＜0.05) in NE7 (ranged from -1.42 to -0.87 ‰) than in SM8 (-0.54 to 1.43 ‰), implying a greater amount of recent deposition of <SUP>15</SUP>N-depleted N in NE7. Tree ring δ<SUP>13</SUP>C gradually decreased over time for both tree species/watersheds, indicating the influence of <SUP>13</SUP>C-depleted CO₂ emitted from industrial sources. Tree ring N concentration and δ<SUP>15</SUP>N were not different between watersheds and did not significantly change with time. Interestingly, however, the difference between watersheds (NE7?SM8) that is expressed as Diff_N (for N) increased with concomitant decreases in Diff_δ<SUP>15</SUP>N over time, implying greater increases in <SUP>15</SUP>N-depleted N input in NE7 than in SM8. Such trends were stronger in aspen stands (R²=0.64 and P＜0.001 for Diff_N and R²=0.44 and P＜0.01 for Diff_δ15N between 1964 and 2009) than in jack pine stands. We conclude that δ<SUP>15</SUP>N in the forest floor and differences in N and δ<SUP>15</SUP>N of tree rings between watersheds are useful indicators reflecting the impact of spatial variations of air pollution on forest stands in the Athabasca oil sands region in western Canada.
목차
1. Introduction
2. Materials and Methods
3. Results
4. Discussion
5. Conclusions
References
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UCI(KEPA) : I410-ECN-0101-2014-520-003364212