排序方式： 共有6条查询结果，搜索用时 93 毫秒
1
1.
Douglas C Morton Marcio H Sales Carlos M SouzaJr Bronson Griscom 《Carbon balance and management》2011,6(1):18
Background
Historic carbon emissions are an important foundation for proposed efforts to Reduce Emissions from Deforestation and forest Degradation and enhance forest carbon stocks through conservation and sustainable forest management (REDD+). The level of uncertainty in historic carbon emissions estimates is also critical for REDD+, since high uncertainties could limit climate benefits from credited mitigation actions. Here, we analyzed source data uncertainties based on the range of available deforestation, forest degradation, and forest carbon stock estimates for the Brazilian state of Mato Grosso during 1990-2008. 相似文献2.
John S. Bullivant 《新西兰海洋与淡水研究杂志》2013,47(1):111-134
The ctenostome bryozoan Zoobotryon verticillatum was found to clear suspensions of four species of algae, at rates ranging from 0.152–1.05 ml per zooid per hour, or 13.9–96.2 ml per mg dry weight per hour, when the algal suspensions were below the satiation concentrations and thus maximum clearance rates would be expected. Suspensions of Monochrysis lutheri, a small flagellate on which the bryozoan grew well and with which most experiments were made, was cleared below the satiation concentration of 7,900 cells per ml, at the mean rate of 0.368 ml per zooid per hour or 33.7 ml per mg dry weight per hour. Satiation concentrations of the four species of algae were of the same order as the highest concentrations of nannoplankton to be expected in the bryozoan's natural habitat. The bryozoan colony fed fairly constantly over a 48 hour period. Assuming oxygen consumption was similar to that of other bryozoans, Zoobotryon verticillatum cleared about 11.6 litres per ml of oxygen consumed. 相似文献
3.
J. S. Bullivant 《新西兰海洋与淡水研究杂志》2013,47(1):135-146
The lophophorates all feed by “impingement” feeding, so named by analogy with certain types of particle separators used in industry. In gymnolaemate bryozoans the feeding current is directed at the mouth where particles impinge and are sucked into the pharynx; in phylactolaemate bryozoans the particles impinge in the trough of the lophophore and are transported to the pharynx by cilia. In phoronids and brachiopods, particles impinge on the frontal surface of the tentacles and are conveyed to the pharynx by tracts of cilia. 相似文献
4.
The presence of striated myofibrils in the vacuolated cells of the pharynx of gymnolaemate bryozoans has been confirmed. The action of these musculo‐columnar cells is to cause the walls of the pharynx, which is triangular in cross‐section, to flex outward thereby sucking in food particles through the mouth. 相似文献
5.
Relatively little research has explored spatial structure in modern major Canadian regions. Three common models are monocentricity, polycentricity, and dispersion, but these are not always mutually exclusive in the complex spatial structures of contemporary city-regions. Shifts between these models are discussed in the context of three explanations of economic growth and restructuring: accessibility, municipal competition, and globalization. All three explanations suggest a trend away from monocentricity. While this appears clearly in US cities, disagreement surrounds whether Canadian cities are following the same path. This study uses cross-sectional data from InfoGroup in 2011 to estimate the relative strengths of monocentricity, polycentricity, and dispersion for characterizing eight major regions. Results indicate that elements of each model are evident in all eight study regions, but each tends to dominate in different contexts. When focusing on Montreal, Toronto, and Vancouver, results imply that all three forces which guide spatial structure play a role and that job centers appear to play a particularly important structural role in larger regions. 相似文献
6.
Zhangcai QIN Xi DENG Bronson GRISCOM Yao HUANG Tingting LI Pete SMITH Wenping YUAN Wen ZHANG 《大气科学进展》2021,38(6):889-895
正"I call on all leaders worldwide to declare a State of Climate Emergency in their own countries until carbon neutrality is reached."–António GUTERRES(United Nations Secretary General), 12 December, 2020 There is no shortcut to a carbon neutral society; solutions are urgently required from both energy industrial sectors and global ecosystems. 相似文献
1