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排序方式: 共有163条查询结果,搜索用时 15 毫秒
161.
Peter E. Levy Renate Wendler Marcel Van Oijen Melvin G. R. Cannell Peter Millard 《Water, Air, & Soil Pollution: Focus》2004,4(6):67-74
Estimates of the global carbon sink induced by nitrogen enrichment range vary widely, from nearly zero to 2.3 Gt C year-1. It is necessary to reduce this uncertainty if we are to make accurate predictions of the future magnitude of the terrestrial carbon sink. Here, we present a Monte Carlo approach to uncertainty and sensitivity analysis of three ecosystem models, Century,BGCand Hybrid. These models were applied to a coniferous forest ecosystem in Sweden. The best estimate of the change in total carbon content of the ecosystem with the cumulative change in nitrogen deposition over 100 years, Ctotal/Ndeposition was 20.1 kg C (kg N)-1 using the pooled mean, with a pooled standard deviation of 13.8 kg C (kg N)-1. Variability in parameters accounted for 92% of the total uncertainty in Ctotal/Ndeposition, and only 8% was attributable to differences between models. The most sensitive parameters were those which controlled the allocation of assimilate between leaves, roots and stem. In particular, an increase in allocation to fine roots led to a large reduction in Ctotal/Ndeposition in all models, because the fine roots have a very high turnover rate, and extra carbon allocated there is soon lost through mortality and decomposition. 相似文献
162.
Woldetsadik Desta Simon Marcel Pierre Knuth Dennis Hailu Hillette Gebresilassie Araya Dejen Asmare Düring Rolf-Alexander 《Environmental geochemistry and health》2021,43(9):3597-3613
Environmental Geochemistry and Health - Khat (Catha edulis) chewing is widespread in the region of East Africa. Even low levels of organochlorine pesticides (OCPs) in khat could induce public... 相似文献
163.
Dröge Janis Moussaoui Ibrahim El Klingelhöfer Doris Held Hannelore Groneberg David. A. Verhoff Marcel A. Plenzig Stefanie 《Environmental science and pollution research international》2022,29(40):60519-60530
Environmental Science and Pollution Research - Particulate matter emitted during autopsies can serve as a vector for numerous viruses or bacteria and can lead to infections. Reducing the exposure... 相似文献