Phosphorus losses from grasslands in short-term ley rotations under boreal conditions : Doctoral Dissertation
Grasslands occupy 45% of agricultural land in Finland, but in provinces characterised by grassland-based dairy production the proportion can be 67%. Phosphorus (P) loads from grasslands to inland waters have received relatively little research attention. In the Finnish climate, soils are subjected t...
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ftluke:oai:jukuri.luke.fi:10024/546547 2023-10-09T21:54:26+02:00 Phosphorus losses from grasslands in short-term ley rotations under boreal conditions : Doctoral Dissertation Räty, Mari 4100210910 Luonnonvarakeskus 69 p. true https://jukuri.luke.fi/handle/10024/546547 en eng Natural Resources Institute Finland Natural resources and bioeconomy studies 91/2020 978-952-380-099-1 https://jukuri.luke.fi/handle/10024/546547 URN:ISBN:978-952-380-099-1 phosphorus erosion grassland ley rotation nutrient loading surface runoff winter publication fi=G5 Artikkeliväitöskirja|sv=G5 Artikelavhandling|en=G5 Doctoral dissertation (article)| ftluke 2023-09-12T20:27:44Z Grasslands occupy 45% of agricultural land in Finland, but in provinces characterised by grassland-based dairy production the proportion can be 67%. Phosphorus (P) loads from grasslands to inland waters have received relatively little research attention. In the Finnish climate, soils are subjected to frost in winter and snowfall comprises a considerable part of total annual precipitation. Surface runoff is generated by limited infiltration of snowmelt water into partially frozen soil in spring, which is a crucial period for dissolved nutrient and soil particle transport, especially in central and northern Finland. This thesis examined the role of perennial grass vegetation in P dynamics in the soil-plant-water continuum and quantified P losses from grasslands under boreal conditions. Potential contributions of perennial vegetation to P losses were estimated indirectly, by determining changes in nutrient content of aboveground vegetation. Susceptibility of overwintering perennial ley regrowth to deliver P was assessed in a simulated snowmelt-induced surface runoff study. These approaches were complemented with five-year monitoring of a small (3.2 km2) agricultural and forested catchment, representing grassland-based dairy production areas in east-central Finland. Amount and inter-annual variation in P losses and erosion rate were quantified. The results showed that grasslands can release substantial amounts of plant-derived P when exposed to frost, freezing and thawing. Elevated P concentrations and losses of up to 0.69 kg ha-1 were detected in simulated snowmelt-induced runoff outflow. Higher P concentrations were also occasionally measured in early spring runoff at small catchment scale. More frequent freezing/thawing will enhance plant-derived P release, especially under a reduced snow layer and lack of insulating cover. In five-year monitoring of an agricultural sub-catchment with short-terms leys, where some fields were under grassland and others under cereals, mean annual total P (TP) losses were 1.0 kg ... Text Northern Finland Natural Resources Institute Finland: Jukuri |
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Open Polar |
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Natural Resources Institute Finland: Jukuri |
op_collection_id |
ftluke |
language |
English |
topic |
phosphorus erosion grassland ley rotation nutrient loading surface runoff winter |
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phosphorus erosion grassland ley rotation nutrient loading surface runoff winter Räty, Mari Phosphorus losses from grasslands in short-term ley rotations under boreal conditions : Doctoral Dissertation |
topic_facet |
phosphorus erosion grassland ley rotation nutrient loading surface runoff winter |
description |
Grasslands occupy 45% of agricultural land in Finland, but in provinces characterised by grassland-based dairy production the proportion can be 67%. Phosphorus (P) loads from grasslands to inland waters have received relatively little research attention. In the Finnish climate, soils are subjected to frost in winter and snowfall comprises a considerable part of total annual precipitation. Surface runoff is generated by limited infiltration of snowmelt water into partially frozen soil in spring, which is a crucial period for dissolved nutrient and soil particle transport, especially in central and northern Finland. This thesis examined the role of perennial grass vegetation in P dynamics in the soil-plant-water continuum and quantified P losses from grasslands under boreal conditions. Potential contributions of perennial vegetation to P losses were estimated indirectly, by determining changes in nutrient content of aboveground vegetation. Susceptibility of overwintering perennial ley regrowth to deliver P was assessed in a simulated snowmelt-induced surface runoff study. These approaches were complemented with five-year monitoring of a small (3.2 km2) agricultural and forested catchment, representing grassland-based dairy production areas in east-central Finland. Amount and inter-annual variation in P losses and erosion rate were quantified. The results showed that grasslands can release substantial amounts of plant-derived P when exposed to frost, freezing and thawing. Elevated P concentrations and losses of up to 0.69 kg ha-1 were detected in simulated snowmelt-induced runoff outflow. Higher P concentrations were also occasionally measured in early spring runoff at small catchment scale. More frequent freezing/thawing will enhance plant-derived P release, especially under a reduced snow layer and lack of insulating cover. In five-year monitoring of an agricultural sub-catchment with short-terms leys, where some fields were under grassland and others under cereals, mean annual total P (TP) losses were 1.0 kg ... |
author2 |
4100210910 Luonnonvarakeskus |
format |
Text |
author |
Räty, Mari |
author_facet |
Räty, Mari |
author_sort |
Räty, Mari |
title |
Phosphorus losses from grasslands in short-term ley rotations under boreal conditions : Doctoral Dissertation |
title_short |
Phosphorus losses from grasslands in short-term ley rotations under boreal conditions : Doctoral Dissertation |
title_full |
Phosphorus losses from grasslands in short-term ley rotations under boreal conditions : Doctoral Dissertation |
title_fullStr |
Phosphorus losses from grasslands in short-term ley rotations under boreal conditions : Doctoral Dissertation |
title_full_unstemmed |
Phosphorus losses from grasslands in short-term ley rotations under boreal conditions : Doctoral Dissertation |
title_sort |
phosphorus losses from grasslands in short-term ley rotations under boreal conditions : doctoral dissertation |
publisher |
Natural Resources Institute Finland |
url |
https://jukuri.luke.fi/handle/10024/546547 |
genre |
Northern Finland |
genre_facet |
Northern Finland |
op_relation |
Natural resources and bioeconomy studies 91/2020 978-952-380-099-1 https://jukuri.luke.fi/handle/10024/546547 URN:ISBN:978-952-380-099-1 |
_version_ |
1779318004741308416 |