作者: Breach 時間: 2025-3-21 22:09 作者: 混合,攙雜 時間: 2025-3-22 01:04
Altering the Water Cycle,the summer months, snowmelt is the main driver of peak streamflow in the spring. I analyzed NOAA snowpack records and USGS streamflow records to show that peak annual streamflow was significantly related to maximum snow water equivalent during the winters of 2005–2016. We conducted intensive field s作者: facilitate 時間: 2025-3-22 07:12
Beaver Loggers: Beaver Herbivory Alters Forest Structure,ell mature trees. Our studies at Kabetogama and Duluth, Minnesota confirmed beavers’ preference for trembling aspen, .. Near the Duluth beaver ponds, beavers traveled more than twice as far to obtain trembling aspen as they did to obtain speckled alder (.), a species which they avoided relative to i作者: 背心 時間: 2025-3-22 09:14
Soils of Beaver Meadows,y of glacial deposits that influence soil properties are superimposed upon this bedrock base. Soils derived from glaciolacustrine deposits have pedogenic carbonates and a high clay content (>30% clay), whereas soils derived from glaciofluvial deposits have a low carbonate content and are sandy. Anal作者: 戲法 時間: 2025-3-22 12:54 作者: 改正 時間: 2025-3-22 19:32 作者: 衰老 時間: 2025-3-22 22:14 作者: 意外的成功 時間: 2025-3-23 03:03 作者: 問到了燒瓶 時間: 2025-3-23 07:50
Beavers as Engineers of Wildlife Habitat,yriad of other species. Beaver impoundments are used extensively by moose and white-tailed deer for feeding, cooling, predator avoidance, and relief from biting insects. Gray wolves focus use on beaver impoundments when preying on beavers, moose, and deer. Wolves also use beaver meadows for rendezvo作者: 雪崩 時間: 2025-3-23 11:38 作者: 植物學(xué) 時間: 2025-3-23 15:47
Ecosystem Engineers: Beaver Ponds,sed the proportion of the landscape covered by open water by 2.15%. In addition, 16 of 21 permanent lakes on the Kabetogama Peninsula had lake outlet beaver dams. Collapse of the Shoepack Lake outlet dam in 2001 released an estimated 2.16 million kL of water and drained approximately 2/3 of the lake作者: OWL 時間: 2025-3-23 18:18 作者: AMITY 時間: 2025-3-24 00:52
Beaver Loggers: Beaver Herbivory Alters Forest Structure,ly decreased forest stem density and altered tree species composition, creating a “bathtub ring” of avoided conifers (.) around the pond that was confirmed by GIS analysis of a forest cover map of the Kabetogama Peninsula.作者: 駭人 時間: 2025-3-24 04:30
Vegetation of Beaver Impoundments,function of canopy height. A model that combined the results of the greenhouse and light attenuation studies correctly predicted that . had a competitive advantage over . under high levels of nitrogen availability, whereas the reverse was true under low nitrogen, saturated conditions. Field observat作者: Relinquish 時間: 2025-3-24 09:39
The Biogeochemistry of Boreal Beaver Ponds,ine soils had higher total N, oxalate-extractable Fe, cation exchange capacity, and base cations (K, Ca, Mg) than did glaciofluvial soils. A split moving window was used along a beaver meadow transect to identify biogeochemical ecotones, the locations where sharp breaks occurred in anaerobiosis and 作者: Foment 時間: 2025-3-24 14:37 作者: Coterminous 時間: 2025-3-24 17:24
Beavers as Engineers of Wildlife Habitat,rey nest almost exclusively on dead trees killed by beaver-flooded forests. Woodpeckers and other cavity nesters also benefit from dead trees in flooded areas. Beaver meadows are attractive to many passerine species that prefer shrubby or grassy habitats. Open water in ponds also provide excellent h作者: 不成比例 時間: 2025-3-24 21:13
chemical effects of beaver browsing and construction. There is a critical need for ecologists and land managers to understand the potential magnitude, persistence, and ecosystem services of beaver landscape tra978-3-319-87104-2978-3-319-61533-2作者: constitute 時間: 2025-3-25 02:41 作者: ARC 時間: 2025-3-25 06:09 作者: 狂亂 時間: 2025-3-25 10:13 作者: FICE 時間: 2025-3-25 12:58
https://doi.org/10.1007/978-0-387-46322-3function of canopy height. A model that combined the results of the greenhouse and light attenuation studies correctly predicted that . had a competitive advantage over . under high levels of nitrogen availability, whereas the reverse was true under low nitrogen, saturated conditions. Field observat作者: Bone-Scan 時間: 2025-3-25 18:35 作者: 標(biāo)準 時間: 2025-3-25 21:48
Jupiter and Saturn, Kings of Worlds,ons except aerobic incubation at 15?°C (other treatments were anaerobic incubation at 15 and 30?°C and aerobic incubation at 30?°C). Field measurement of trace gas fluxes showed that beaver ponds and beaver meadows with water table at or above the soil surface emitted methane, but beaver meadows wit作者: 最初 時間: 2025-3-26 03:11
https://doi.org/10.1007/978-0-387-46322-3rey nest almost exclusively on dead trees killed by beaver-flooded forests. Woodpeckers and other cavity nesters also benefit from dead trees in flooded areas. Beaver meadows are attractive to many passerine species that prefer shrubby or grassy habitats. Open water in ponds also provide excellent h作者: acetylcholine 時間: 2025-3-26 08:01 作者: 漸強 時間: 2025-3-26 09:50
Soils of Beaver Meadows,ysis of soils from well boreholes within a single beaver meadow showed textures ranging from sandy loam (mean phi size?=?3.59) to clay (mean phi size?=?7.31). The soil survey for the Kabetogama Peninsula maps beaver impoundments primarily as Sax-Tacoosh complex, ponded.作者: 刺穿 時間: 2025-3-26 14:15 作者: 動脈 時間: 2025-3-26 20:30 作者: 演講 時間: 2025-3-26 23:33 作者: 止痛藥 時間: 2025-3-27 05:09
and landscape ecologists, wildlife managers, and students.CoBridging the fields of ecosystem science and landscape ecology, this book integrates Dr. Carol Johnston‘s research on beaver ecosystem alteration at Voyageurs National Park. The findings about the vegetation, soils, and chemistry of beaver 作者: 職業(yè) 時間: 2025-3-27 05:27
The Patrick Moore Practical Astronomy Seriesged the beaver’s habitat. Beaver numbers began to recover after the fire of 1936, and trapping was discontinued with the establishment of Voyageurs National Park in 1975. Beaver density peaked in 1981 at 1.4 colonies per square kilometer, among the highest in North America.作者: 詞匯表 時間: 2025-3-27 09:41
,Legacy of Beaver–Human Interaction,ged the beaver’s habitat. Beaver numbers began to recover after the fire of 1936, and trapping was discontinued with the establishment of Voyageurs National Park in 1975. Beaver density peaked in 1981 at 1.4 colonies per square kilometer, among the highest in North America.作者: 譏笑 時間: 2025-3-27 17:09
The Patrick Moore Practical Astronomy Seriesed to co-exist. Over-trapping of beavers during the 1600s–1800s decimated beaver populations in northern Minnesota. Logging and forest fires also changed the beaver’s habitat. Beaver numbers began to recover after the fire of 1936, and trapping was discontinued with the establishment of Voyageurs Na作者: 束以馬具 時間: 2025-3-27 18:52 作者: Solace 時間: 2025-3-27 22:46
The Enigmas of Mars, the Red Planet,the summer months, snowmelt is the main driver of peak streamflow in the spring. I analyzed NOAA snowpack records and USGS streamflow records to show that peak annual streamflow was significantly related to maximum snow water equivalent during the winters of 2005–2016. We conducted intensive field s作者: BROW 時間: 2025-3-28 04:33
The Enigmas of Mars, the Red Planet,ell mature trees. Our studies at Kabetogama and Duluth, Minnesota confirmed beavers’ preference for trembling aspen, .. Near the Duluth beaver ponds, beavers traveled more than twice as far to obtain trembling aspen as they did to obtain speckled alder (.), a species which they avoided relative to i作者: Overstate 時間: 2025-3-28 06:39 作者: 障礙物 時間: 2025-3-28 14:28
https://doi.org/10.1007/978-0-387-46322-3beaver meadows were dominated by two graminoid plant species, . and .. . dominated in wetter sites along streams and the edges of residual beaver ponds which had lower nitrate availability (determined using in situ resin bags), whereas the ubiquitous . dominated in mesic to dry portions of beaver me作者: Ornithologist 時間: 2025-3-28 15:56
Mercury, Venus, and the Inner Solar System, studies showed that, as anaerobic conditions increased, porewater concentrations of Fe. increased and SO.. decreased, consistent with the predictions of redox reactions. Porewater PO.. concentrations also increased under anaerobic conditions, presumably due to dissolution of iron phosphates followi作者: grounded 時間: 2025-3-28 19:53 作者: 消散 時間: 2025-3-28 23:09
The Patrick Moore Practical Astronomy Seriesndscapes. We examine the influence of both local successional processes associated with beaver activity and regional geomorphic boundaries on spatial variation in fish assemblages along the Kabetogama Peninsula in Voyageurs National Park, northern Minnesota, USA. Based on the results, we present a h作者: collateral 時間: 2025-3-29 03:18
https://doi.org/10.1007/978-0-387-46322-3yriad of other species. Beaver impoundments are used extensively by moose and white-tailed deer for feeding, cooling, predator avoidance, and relief from biting insects. Gray wolves focus use on beaver impoundments when preying on beavers, moose, and deer. Wolves also use beaver meadows for rendezvo作者: 蝕刻 時間: 2025-3-29 08:30
https://doi.org/10.1007/978-3-319-61533-2Castor canadensis; herbivory; nutrient cycling; soil carbon; beaver ponds; beaver meadows; Fish and Wildli作者: CLEAR 時間: 2025-3-29 13:09
978-3-319-87104-2Springer International Publishing AG 2017作者: beta-carotene 時間: 2025-3-29 19:15
Carol A. JohnstonFocuses specifically on landscape and ecosystem alteration by beavers.Provides a cohesive reference useful to wetland scientists, ecosystem and landscape ecologists, wildlife managers, and students.Co作者: 放逐某人 時間: 2025-3-29 22:05
http://image.papertrans.cn/b/image/181967.jpg作者: neurologist 時間: 2025-3-30 00:52
