搜索结果: 1-8 共查到“海洋地质学 streams”相关记录8条 . 查询时间(0.171 秒)
Carbon cycling within epilithic biofilm communities across a nutrient gradient of headwater streams
Carbon cycling within epilithic biofilm communities across a nutrient gradient headwater streams
2014/4/17
Primary production (PP), nutrient uptake, and carbon (C) cycling within epilithic biofilm communities were assessed in four headwater streams in the Arkansas Ozarks, U.S.A., representing a hundred-fol...
Assimilatory uptake rather than nitrification and denitrification determines nitrogen removal patterns in streams of varying land use
Assimilatory uptake nitrification denitrification deter nitrogen removal patterns in streams of varying land use
2014/4/18
Agricultural and urban land use increase nitrogen (N) concentrations in streams, which can saturate biotic demand by plants, algae, and bacteria via assimilative uptake, and by nitrification and denit...
Nitrogen dynamics in grassland streams along a gradient of agricultural development
Nitrogen dynamics grassland streams gradient of agricultural development
2014/4/22
We examined nitrogen (N) uptake in seven grassland streams lying in catchments along a gradient (0-84%) of agricultural land use in New Zealand using a stable isotope (15N) addition of NH4+ to quantif...
Many natural streams are net heterotrophic, so I propose that trophic state be divided into autotrophic and
heterotrophic state. This division allows consideration of the influence of external ...
Role of wetlands and developed land use on dissolved organic nitrogen concentrations and DON/TDN in northeastern U.S. rivers and streams
Role of wetlands developed land dissolved organic nitrogen concentrations DON/TDN northeastern U.S. rivers and streams
2014/5/19
Previous studies have shown that watersheds with significant human development (i.e., urban and agricultural land use) generally have higher concentrations and fluxes of dissolved inorganic nitrogen (...
The influence of substratum type and nutrient supply on biofilm organic matter utilization in streams
substratum type nutrient supply
2014/5/19
We investigated the effect of benthic substratum type (sand and rocks) and nutrient supply (N and P) on biofilm
structure and heterotrophic metabolism in a field experiment in a forested ...
Hydrologic and hydraulic control of macrophyte establishment and performance in streams
macrophyte establishment streams
2014/5/21
Macrophytes play a key role in many unshaded lotic ecosystems, but little is known of the factors controlling
their presence, abundance, and composition. Macrophyte abundance, diversity, and composit...
The influence of particle size on seston deposition in streams
particle size seston deposition streams
2014/6/9
We investigated how particle size influences deposition and transport of fine particulate organic matter in streams. Field additions of very fine (VFPOM, 15-52 μm), fine (FPOM, 53-106 μm), and medium ...