• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Soil emission inventories of nitrogen oxide and nitrous oxide from natural ecosystems in Ontario.
【24h】

Soil emission inventories of nitrogen oxide and nitrous oxide from natural ecosystems in Ontario.

机译：安大略省自然生态系统中氮氧化物和一氧化二氮的土壤排放清单。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The purpose of this study was to determine a complete soil emission inventory of NO{dollar}sb{lcub}rm x{rcub}{dollar} and N{dollar}sb2{dollar}O for the Province of Ontario. The source strength of atmospheric trace gases from natural ecosystems must be quantified in order to assess the effect of such inputs on the background tropospheric chemistry. This was the first complete soil emission inventory available for the province, and required the determination of the emissions from the northern wetlands and boreal forests.; Canada contains approximately 54% of the world's {dollar}2.76 times 10sp6{dollar} km{dollar}sp2{dollar} of boreal and polar peatland, but NO{dollar}sb{lcub}rm x{rcub}{dollar} and N{dollar}sb2{dollar}O emissions from this ecosystem had never been previously measured. Nitrous oxide emissions were obtained along a transect from the coast of the James Bay to Kinosheo Lake, during the ice free season period of 1990. Two emission mechanisms, one diffusive and the other episodic, were found to be responsible for the emissions of N{dollar}sb2{dollar}O. The total emission of N{dollar}sb2{dollar}O from the Hudson Bay lowland was 1.2 Gg/yr, of which 80% were attributed to episodic emissions. The emissions of NO{dollar}sb{lcub}rm x{rcub}{dollar} from the northern wetlands were found to be very small, only one seventh of the uptake rate determined.; Boreal forests cover on the order of 55% of the Province of Ontario, and no previous measurements of the emissions of NO{dollar}sb{lcub}rm x{rcub}{dollar} and N{dollar}sb2{dollar}O were available. In the summer of 1992, emission measurements were made from an undisturbed forest, a drained forest, an upland forest and a clear-cut forest. Although the effects of drainage were slight for the emission of NO{dollar}sb{lcub}rm x{rcub}{dollar} and N{dollar}sb2{dollar}O, those of clear-cutting were significant. The uptake of N{dollar}sb2{dollar}O was clearly enhanced in the drainage ditches by the presence of algae, which also resulted in large CH{dollar}sb4{dollar} production.; With the data available from these major ecosystems, a soil emission inventory for the Province of Ontario was compiled. The annual emission of NO{dollar}sb{lcub}rm x{rcub}{dollar} in the province was determined to be 5.4 Gg, of which 82% were emitted from agricultural soils (5.5% of the land area). Emissions from forests accounted for 17% and 0.5% from wetlands. The annual emission of N{dollar}sb2{dollar}O in the province was determined to be 7.9 Gg, of which 68% was emitted from agricultural soils. Forests accounted for 17.8% and wetlands for 14.2%. Inventories such as this, are essential in developing a clear understanding of the role of natural emissions in both local and global air chemistry.
机译：这项研究的目的是确定安大略省NO {dollar} sb {lcub} rm x {rcub} {dollar}和N {dollar} sb2 {dollar} O的完整土壤排放清单。必须对来自自然生态系统的大气痕量气体的源强度进行量化，以便评估此类输入对背景对流层化学的影响。这是该省第一个完整的土壤排放清单，需要确定北部湿地和北方森林的排放量。加拿大的北方和极地泥炭地占世界的{sp} {dol} 2.76乘10sp6 {dollar} km {dol} sp2 {dollar}，约占54％，但没有{dollar} sb {lcub} rm x {rcub} {dollar}和N以前从未测量过该生态系统产生的{dollar} sb2 {dollar} O排放量。一氧化二氮排放物是在1990年无冰季节期间从詹姆斯湾海岸到Kinosheo湖沿一条样带获得的。发现了两种排放机制，一种是扩散性的，另一种是周期性的，是N {美元} sb2 {dollar} O。哈德逊湾低地的N {dolb} sb2 {dollar} O总排放量为1.2 Gg /年，其中80％是由偶发性排放引起的。北部湿地的NOx排放量非常小，仅为吸收率的七分之一。北方森林覆盖安大略省55％的量级，以前没有测量NO {dollarssb {lcub} rm x {rcub} {dollar}和N {dollar} sb2 {dollar} O的排放量可用。在1992年夏天，对未受干扰的森林，流失的森林，高地森林和砍伐森林进行了排放测量。尽管排水对NO {sorb} rmx {rcub} {nol}和N {dols} sb2 {dollar} O的排放影响很小，但清除效果却很显着。藻类的存在明显地提高了排水沟中N {sb2sb2 {dollar} O的吸收，这也导致了CH {sdol4sb4 {dollar}的大量生产。利用这些主要生态系统的数据，编制了安大略省的土壤排放清单。经确定，该省的年排放量为5.4 Gg，其中82％来自农业土壤（占土地面积的5.5％）。森林的排放量占湿地的17％和0.5％。经确定，该省N {dollar} sb2 {dollar} O的年排放量为7.9 Gg，其中68％来自农业土壤。森林占17.8％，湿地占14.2％。这样的清单对于深入了解自然排放物在本地和全球空气化学中的作用至关重要。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号