Farming for bees: annual variation in pollinator populations across agricultural landscapes

2018 ◽  
Vol 20 (4) ◽  
pp. 541-548 ◽  
Author(s):  
Erika M. Tucker ◽  
Sandra M. Rehan
Keyword(s):  
Annual Variation ◽  
Agricultural Landscapes ◽  
Pollinator Populations

scholarly journals Soil carbon cycling and sequestration in a seasonally saturated wetland receiving agricultural runoff

2011 ◽  
Vol 8 (11) ◽  
pp. 3391-3406 ◽  
Author(s):  
J. J. Maynard ◽  
R. A. Dahlgren ◽  
A. T. O'Geen
Keyword(s):  
Organic Carbon ◽  
Annual Variation ◽  
Temporal Dynamics ◽  
Sediment Cores ◽  
Soil Layer ◽  
C Sequestration ◽  
Agricultural Runoff ◽  
Agricultural Landscapes ◽  
Depositional Environments

Abstract. The fate of organic carbon (C) lost by erosion is not well understood in agricultural settings. Recent models suggest that wetlands and other small water bodies may serve as important long-term sinks of eroded C, receiving ~30 % of all eroded material in the US. To better understand the role of seasonally-saturated wetlands in sequestering eroded C, we examined the spatial and temporal dynamics of C and sediment accumulation in a 13-year-old constructed wetland used to treat agricultural runoff. The fate of C sequestered within deposited sediment was modeled using point-sampling, remote sensing, and geostatistics. Using a spatially-explicit sampling design, annual net rates of sedimentation and above-ground biomass were measured during two contrasting years (vegetated (2004) vs. non-vegetated (2005)), followed by collection of sediment cores to the antecedent soil layer, representing 13 years of sediment and C accumulation. We documented high annual variation in the relative contribution of endogenous and exogenous C sources, as well as absolute rates of sediment and C deposition. This annual variation, however, was muted in the long-term (13 yr) sediment record, which showed consistent vertical patterns of uniform C distribution (~14 g kg–1) and δ13C signatures in high depositional environments. This was in contrast to low depositional environments which had high levels of surface C enrichment (20–35 g kg–1) underlain by C depleted (5–10 g kg–1) sediments and an increasing δ13C signature with depth indicating increased decomposition. These results highlight the importance of sedimentation in physically protecting soil organic carbon and its role in controlling the long-term C concentration of seasonally-saturated wetland soils. While significant enrichment of surface sediments with endogenous C occurred in newly deposited sediment (i.e., 125 kg m2 in 2004), fluctuating cycles of flooding and drying maintained the long-term C concentration at the same level as inflowing sediment (i.e., 14 g kg–1), indicating no additional long-term storage of endogenous C. These results demonstrate that constructed flow-through wetlands can serve as important sinks for eroded C and sediment in agricultural landscapes, however, additional C sequestration via enrichment from endogenous sources may be limited in seasonally-saturated wetlands due to rapid decomposition during drying cycles.

scholarly journals Agricultural induced impacts on soil carbon cycling and sequestration in a seasonally saturated wetland

2011 ◽  
Vol 8 (3) ◽  
pp. 6031-6075
Author(s):  
J. J. Maynard ◽  
A. T. O'Geen ◽  
R. A. Dahlgren
Keyword(s):  
Organic Carbon ◽  
Annual Variation ◽  
Temporal Dynamics ◽  
Sediment Cores ◽  
Soil Layer ◽  
C Sequestration ◽  
Agricultural Runoff ◽  
Agricultural Landscapes ◽  
Depositional Environments

Abstract. The fate of organic carbon (C) lost by erosion is not well understood in agricultural settings. Recent models suggest that wetlands and other small water bodies may serve as important long-term sinks of eroded C, receiving ~30 % of all eroded material in the US. To better understand the role of seasonally-saturated wetlands in sequestering eroded C, we examined the spatial and temporal dynamics of C and sediment accumulation in a 13-yr-old constructed wetland used to treat agricultural runoff. The fate of C sequestered within deposited sediment was modeled using point-sampling, remote sensing, and geostatistics. Using a spatially-explicit sampling design, annual net rates of sedimentation and above ground biomass were measured during two contrasting years (vegetated, 2004 vs. non-vegetated, 2005), followed by collection of sediment cores to the antecedent soil layer, representing 13 yr of sediment and C accumulation. We documented high annual variation in the relative contribution of endogenous and exogenous C sources, as well as absolute rates of sediment and C deposition. This annual variation, however, was muted in the long-term (13-yr) sediment record, which showed consistent vertical patterns of uniform C distribution (~14 g kg−1) and δ13C signatures in high depositional environments. This was in contrast to low depositional environments which had high levels of surface C enrichment (20–35 g kg−1) underlain by C depleted (5–10 g kg−1) sediments and an increasing δ13C signature with depth indicating increasing decomposition. These results highlight the importance of sedimentation in physically protecting soil organic carbon and its role in controlling the long-term C concentration of seasonally-saturated wetland soils. While significant enrichment of surface sediments with endogenous C occurred in newly deposited sediment (i.e., 125 kg m2 in 2004), fluctuating cycles of flooding and drying maintained the long-term C concentration at the same level as inflowing sediment (i.e., 14 g kg−1), indicating no additional long-term storage of endogenous C. These results demonstrate that constructed flow-through wetlands can serve as important sinks for eroded C and sediment in agricultural landscapes, however, additional C sequestration via enrichment from endogenous sources may be limited in seasonally-saturated wetlands due to rapid decomposition during drying cycles.

To the issue of water treatment by hydrocyclone on the systems of the combined irrigation

2020 ◽  
Vol 0 (2) ◽  
pp. 21-25
Author(s):  
Nikolay Dubenok ◽  
Andrey Novikov ◽  
Sergei Borodychev ◽  
Maria Lamskova
Keyword(s):  
Water Treatment ◽  
Organic Compounds ◽  
Irrigation Water ◽  
Irrigation System ◽  
Petroleum Products ◽  
Cylindrical Part ◽  
Agricultural Landscapes ◽  
Treatment Unit ◽  
Drain Pipe ◽  
Irrigation Network

At the stage of water treatment for irrigation systems, the efficiency capture coarse and fine mechanical impurities, as well as oil products and organic compounds affects the reliability of the equipment of the irrigation network and the safety of energy exchange processes in irrigated agricultural landscapes. The violation of work irrigation system can cause disruptions in irrigation schedules of agricultural crops, crop shortages, degradation phenomena on the soil and ecological tension. For the combined irrigation system, a water treatment unit has been developed, representing a hydrocyclone apparatus with a pipe filter in the case. For the capacity of 250 m3/h the main geometrical dimensions of hydrocyclone have been calculated. To organize the capture petroleum products and organic compounds, it has been proposed a modernization of a hydrocyclone unit, consisting in dividing the cylindrical part of the apparatus into two section. The first is section is for input irrigation water, the second one is for additional drainage of clarified irrigation water after sorption purification by the filter, placed on the disk and installed coaxially with the drain pipe and the pipe filter.

Annual variation in the timing of breeding, pre‑breeding foraging areas and corticosterone levels in an Arctic population of black-legged kittiwakes

2014 ◽  
Vol 496 ◽  
pp. 233-247 ◽  
Author(s):  
A Goutte ◽  
F Angelier ◽  
C Bech ◽  
C Clément-Chastel ◽  
G Dell’Omo ◽  
...  
Keyword(s):  
Annual Variation ◽  
Timing Of Breeding

Greenhouse Gas Mitigation Opportunities in Agricultural Landscapes

10.1596/25171 ◽  
2016 ◽  
Author(s):  
Ademola K. Braimoh ◽  
Xiaoyue Hou ◽  
Christine Heumesser ◽  
Yuxuan Zhao
Keyword(s):  
Greenhouse Gas ◽  
Agricultural Landscapes ◽  
Greenhouse Gas Mitigation

A STUDY ON THE ANNUAL VARIATION OF ENERGY CONSUMPTION IN OFFICE BUILDINGS

2007 ◽  
Vol 72 (615) ◽  
pp. 81-87
Author(s):  
Kazuhiko SAKAMOTO ◽  
Saburo MURAKAWA ◽  
Michimasa SHINOHARA ◽  
Daisaku NISHINA ◽  
Yoshiyuki UEMURA
Keyword(s):  
Energy Consumption ◽  
Annual Variation ◽  
Office Buildings

Ground beetles (Coleoptera: Carabidae) assemblages in two agricultural landscapes in North-Eastern Algeria

2014 ◽  
Vol 40 (2) ◽  
pp. 5-16 ◽  
Author(s):  
Yasmina Saouache ◽  
Salaheddine Doumandji ◽  
Nadia Ouchtati
Keyword(s):  
Ground Beetles ◽  
Agricultural Landscapes ◽  
North Eastern ◽  
Eastern Algeria
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