scholarly journals Effects of sylvicultural practices on nutrient status in a Pinus radiata plantation: Nutrient export by tree removal and nutrient dynamics in decomposing logging residues

2001 ◽  
Vol 58 (4) ◽  
pp. 411-422 ◽  
Author(s):  
Guzm�n Ouro ◽  
Pilar P�rez-Batall�n ◽  
Agust�n Merino
Keyword(s):  
Pinus Radiata ◽  
Nutrient Dynamics ◽  
Nutrient Status ◽  
Nutrient Export ◽  
Logging Residues ◽  
Tree Removal

scholarly journals Precocious Male Cone Production associated with Low Nutrient Status in Clones of Pinus radiata

Nature ◽  
1965 ◽  
Vol 206 (4985) ◽  
pp. 739-739 ◽  
Author(s):  
G. B. SWEET ◽  
G. M. WILL
Keyword(s):  
Pinus Radiata ◽  
Nutrient Status ◽  
Cone Production ◽  
Male Cone

scholarly journals The significance of organic carbon and nutrient export from peatland-dominated landscapes subject to disturbance, a stoichiometric perspective

2009 ◽  
Vol 6 (3) ◽  
pp. 363-374 ◽  
Author(s):  
S. Waldron ◽  
H. Flowers ◽  
C. Arlaud ◽  
C. Bryant ◽  
S. McFarlane
Keyword(s):  
Organic Carbon ◽  
Soluble Reactive Phosphorus ◽  
Nutrient Status ◽  
Co2 Efflux ◽  
Nutrient Export ◽  
Terrestrial Carbon ◽  
Carbon Export ◽  
Aquatic Respiration ◽  
Linear Relationships ◽  
Reactive Phosphorus

Abstract. The terrestrial-aquatic interface is a crucial environment in which to consider the fate of exported terrestrial carbon in the aquatic system. Here the fate of dissolved organic carbon (DOC) may be controlled by nutrient availability. However, peat-dominated headwater catchments are normally of low nutrient status and thus there is little data on how DOC and nutrient export co-varies. We present nutrient and DOC data for two UK catchments dominated by peat headwaters. One, Whitelee, is undergoing development for Europe's largest windfarm. Glen Dye by comparison is relatively undisturbed. At both sites there are significant linear relationships between DOC and soluble reactive phosphorus and nitrate concentrations in the drainage waters. However, inter-catchment differences exist. Changes in the pattern of nutrient and carbon export at Whitelee reveal that landscape disturbance associated with windfarm development impacts the receiving waters, and that nutrient export does not increase in a stoichiometric manner that will promote increase in microbial biomass but rather supports aquatic respiration. In turn greater CO2 efflux may prevail. Hence disturbance of terrestrial carbon stores may impact the both the aquatic and gaseous carbon cycle. We suggest estimates of aquatic carbon export should inform the decision-making process prior to development in ecosystems and catchments with high terrestrial carbon storage.

scholarly journals Conceptual Mini-Catchment Typologies for Testing Dominant Controls of Nutrient Dynamics in Three Nordic Countries

Water ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1776 ◽  
Author(s):  
Fatemeh Hashemi ◽  
Ina Pohle ◽  
Johannes W.M. Pullens ◽  
Henrik Tornbjerg ◽  
Katarina Kyllmar ◽  
...  
Keyword(s):  
Land Use ◽  
Nutrient Dynamics ◽  
Pollution Monitoring ◽  
Organic N ◽  
Particulate Phosphorus ◽  
Nutrient Concentrations ◽  
Data Series ◽  
Nutrient Export ◽  
Small Streams ◽  
Export Behaviour

Optimal nutrient pollution monitoring and management in catchments requires an in-depth understanding of spatial and temporal factors controlling nutrient dynamics. Such an understanding can potentially be obtained by analysing stream concentration–discharge (C-Q) relationships for hysteresis behaviours and export regimes. Here, a classification scheme including nine different C-Q types was applied to a total of 87 Nordic streams draining mini-catchments (0.1–65 km2). The classification applied is based on a combination of stream export behaviour (dilution, constant, enrichment) and hysteresis rotational pattern (clock-wise, no rotation, anti-clockwise). The scheme has been applied to an 8-year data series (2010–2017) from small streams in Denmark, Sweden, and Finland on daily discharge and discrete nutrient concentrations, including nitrate (NO3−), total organic N (TON), dissolved reactive phosphorus (DRP), and particulate phosphorus (PP). The dominant nutrient export regimes were enrichment for NO3− and constant for TON, DRP, and PP. Nutrient hysteresis patterns were primarily clockwise or no hysteresis. Similarities in types of C-Q relationships were investigated using Principal Component Analysis (PCA) considering effects of catchment size, land use, climate, and dominant soil type. The PCA analysis revealed that land use and air temperature were the dominant factors controlling nutrient C-Q types. Therefore, the nutrient export behaviour in streams draining Nordic mini-catchments seems to be dominantly controlled by their land use characteristics and, to a lesser extent, their climate.

DairyMod and EcoMod: biophysical pasture-simulation models for Australia and New Zealand

2008 ◽  
Vol 48 (5) ◽  
pp. 621 ◽  
Author(s):  
I. R. Johnson ◽  
D. F. Chapman ◽  
V. O. Snow ◽  
R. J. Eckard ◽  
A. J. Parsons ◽  
...  
Keyword(s):  
New Zealand ◽  
Nutrient Dynamics ◽  
Irrigation Management ◽  
Management Strategies ◽  
Simulation Models ◽  
Nutrient Status ◽  
Pasture Management ◽  
Management Options ◽  
Recent Developments ◽  
Fertiliser Application

DairyMod and EcoMod, which are biophysical pasture-simulation models for Australian and New Zealand grazing systems, are described. Each model has a common underlying biophysical structure, with the main differences being in their available management options. The third model in this group is the SGS Pasture Model, which has been previously described, and these models are referred to collectively as ‘the model’. The model includes modules for pasture growth and utilisation by grazing animals, water and nutrient dynamics, animal physiology and production and a range of options for pasture management, irrigation and fertiliser application. Up to 100 independent paddocks can be defined to represent spatial variation within a notional farm. Paddocks can have different soil types, nutrient status, pasture species, fertiliser and irrigation management, but are subject to the same weather. Management options include commonly used rotational grazing management strategies and continuous grazing with fixed or variable stock numbers. A cutting regime simulates calculation of seasonal pasture growth rates. The focus of the present paper is on recent developments to the management routines and nutrient dynamics, including organic matter, inorganic nutrients, leaching and gaseous nitrogen losses, and greenhouse gases. Some model applications are presented and the role of the model in research projects is discussed.

Soils, crop nutrient status and nutrient dynamics on small-holder farms in central Tibet, China

2011 ◽  
Vol 348 (1-2) ◽  
pp. 219-229 ◽  
Author(s):  
Nicholas G. Paltridge ◽  
Samantha P. P. Grover ◽  
Liu Gouyi ◽  
Jin Tao ◽  
Murray J. Unkovich ◽  
...  
Keyword(s):  
Nutrient Dynamics ◽  
Nutrient Status ◽  
Central Tibet ◽  
Small Holder

Decomposition and nutrient dynamics of green and freshly fallen radiata pine (Pinus radiata) needles

2003 ◽  
Vol 179 (1-3) ◽  
pp. 169-181 ◽  
Author(s):  
G.K. Girisha ◽  
L.M. Condron ◽  
P.W. Clinton ◽  
M.R. Davis
Keyword(s):  
Pinus Radiata ◽  
Nutrient Dynamics ◽  
Radiata Pine

scholarly journals Stable Isotopic Evidence for Nutrient Rejuvenation and Long-Term Resilience on Tikopia Island (Southeast Solomon Islands)

2021 ◽  
Vol 13 (15) ◽  
pp. 8567
Author(s):  
Jillian A. Swift ◽  
Patrick V. Kirch ◽  
Jana Ilgner ◽  
Samantha Brown ◽  
Mary Lucas ◽  
...  
Keyword(s):  
Land Use ◽  
Nutrient Dynamics ◽  
Solomon Islands ◽  
Isotope Analysis ◽  
Nutrient Status ◽  
Nitrogen Isotope ◽  
External Support ◽  
Deep Time ◽  
Human Land Use

Tikopia Island, a small and relatively isolated Polynesian Outlier in the Southeast Solomon Islands, supports a remarkably dense human population with minimal external support. Examining long-term trends in human land use on Tikopia through archaeological datasets spanning nearly 3000 years presents an opportunity to investigate pathways to long-term sustainability in a tropical island setting. Here, we trace nutrient dynamics across Tikopia’s three pre-European contact phases (Kiki, Sinapupu, Tuakamali) via stable carbon and nitrogen isotope analysis of commensal Pacific rat (Rattus exulans) and domestic pig (Sus scrofa) bone and tooth dentine collagen. Our results show a decline in δ15N values from the Kiki (c. 800 BC-AD 100) to Sinapupu (c. AD 100–1200) phases, consistent with long-term commensal isotope trends observed on other Polynesian islands. However, increased δ15N coupled with lower δ13C values in the Tuakamali Phase (c. AD 1200–1800) point to a later nutrient rejuvenation, likely tied to dramatic transformations in agriculture and land use at the Sinapupu-Tuakamali transition. This study offers new, quantifiable evidence for deep-time land and resource management decisions on Tikopia and subsequent impacts on island nutrient status and long-term sustainability.

scholarly journals Topography and Land Use Modulate Hydrological and Nutrient Export Dynamics in two Andean Streams

2019 ◽  
Author(s):  
Alejandro Sosnovsky ◽  
Mailén Elizabeth Lallement ◽  
Magalí Rechencq ◽  
Eduardo Enrique Zattara ◽  
María Valeria Fernández ◽  
...  
Keyword(s):  
Land Use ◽  
Nutrient Dynamics ◽  
Mountain Lake ◽  
Nutrient Export ◽  
Drainage Basins ◽  
Coarse Particulate Organic Matter ◽  
Annual Basis ◽  
Export Dynamics ◽  
Fluvial Dynamics ◽  
Limiting Nutrient

AbstractFluvial dynamics are driven by multiple environmental factors and scales. Studies coupling hydrological and nutrient dynamics of Andean streams are almost nonexistent. We characterized two adjacent streams with contrasting drainage basins: Casa de Piedra, originating in a small mountain lake and running through a pristine landscape, and Gutiérrez, originating in a large piedmont lake and running through an anthropized landscape. Despite both drainage basins sharing geology and climate, we found that the streams presented contrasting hydrological and nutrient dynamics. Casa de Piedra had higher discharge flashiness with shorter response delays to precipitation. Interestingly, Gutiérrez’s hydrology was buffered by the upstream lake, but its nutrient exports were not. Differences observed in quality and timing of coarse particulate organic matter export and basal export levels of phosphorus and nitrogen could be explained by human activities affecting Gutiérrez but not Casa de Piedra. Moreover, nitrogen:phosphorus ratio indicates a possible future shift to phosphorus as the limiting nutrient as Andean basins become more densely populated. In summary, our annual basis study shows that even under a common geology and climate, stream dynamics of adjacent basins can be starkly different due to differences in topography and land use.

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