How does continuity in grassland management after ploughing affect plant community patterns?

Ley cultivation by ploughing and fertilising constitute a severe impact on plant community patterns in semi-natural subalpine communities. Since the 1950s, such cultivation have been an important part of the agroecosystem in subalpine areas in Norway, and regularly practised. Today, several former l...

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Published in:Plant ecology 1999-11, Vol.145 (1), p.59-74
Main Authors: Austrheim, G, Olsson, G.A
Format: Article
Language:English
Subjects:
Agricultural ecosystems
Biodiversity
botanical composition
Bryophytes
Cryptogams
Cultivation
ecological succession
Flowers & plants
Grasses
Grassland management
Grasslands
grazing
Growing season
Heterogeneity
land use
Lichens
nitrates
Norway
Pasture management
patterns
phosphates
Plant communities
Plant diversity
Plant ecology
Plant species
Plants
Plowing
range management
soil chemistry
soil fertility
spatial distribution
Species
Species diversity
subalpine grasslands
Vascular plants
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description Ley cultivation by ploughing and fertilising constitute a severe impact on plant community patterns in semi-natural subalpine communities. Since the 1950s, such cultivation have been an important part of the agroecosystem in subalpine areas in Norway, and regularly practised. Today, several former leys are left for grazing management. Plant species diversity and heterogeneity was studied in subalpine grasslands in Valdres, southern Norway (ca. 950 m a.s.l.) at different successional phases after ploughing. Fourteen sites (100 m(2)) varying from recently ploughed grasslands (3-5 years at phase 1) to unploughed sites were used to construct a temporal gradient by a space for time substitution. Small-scale species diversity (0.25 m(2)) of vascular plants increased continuously with the time since last ploughing, while the variation in gamma-diversity was minor among late successional phases 3-5 (>23-28 years, 32-39 years and unploughed sites) after an evident increase from phase 1-3. The number of exclusive species peaked within unploughed sites (10), and included perennial herbs (Antennaria alpina, Hieracium auricula, Viola canina), spore-producing species (Botrychium lunaria, Selaginella selagionides) and woody life-forms. Species diversity of cryptogams was low at both a small and large scale within successional phases 1 and 2 (
doi_str_mv 10.1023/A:1009804509239
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Since the 1950s, such cultivation have been an important part of the agroecosystem in subalpine areas in Norway, and regularly practised. Today, several former leys are left for grazing management. Plant species diversity and heterogeneity was studied in subalpine grasslands in Valdres, southern Norway (ca. 950 m a.s.l.) at different successional phases after ploughing. Fourteen sites (100 m(2)) varying from recently ploughed grasslands (3-5 years at phase 1) to unploughed sites were used to construct a temporal gradient by a space for time substitution. Small-scale species diversity (0.25 m(2)) of vascular plants increased continuously with the time since last ploughing, while the variation in gamma-diversity was minor among late successional phases 3-5 (&gt;23-28 years, 32-39 years and unploughed sites) after an evident increase from phase 1-3. The number of exclusive species peaked within unploughed sites (10), and included perennial herbs (Antennaria alpina, Hieracium auricula, Viola canina), spore-producing species (Botrychium lunaria, Selaginella selagionides) and woody life-forms. Species diversity of cryptogams was low at both a small and large scale within successional phases 1 and 2 (&lt;12 years). Small scale cryptogam diversity peaked at the unploughed sites, while gamma diversity peaked at phase 3(23-28 years). This intermediate phase 3 also had the highest number of exclusive species (12) which exceeded unploughed sites (8). A coarse spatial structure of cryptogams at phase 3 was indicated by a low mean of species distribution. The soil of uncultivated grasslands (phase 5) was, at the end of the growing season (mid August), quite base-rich with a higher content for all measured nutrients as compared to intermediate phases of continuity (phase 3 and 4) The exception was nitrate which was not detectable from phase 3 to 5, and available phosphate which peaked at an intermediate phase of succession (phase 3 and 4). Heterogeneity of vascular plants reached a minimum value at the intermediate phase (3) while cryptogam heterogeneity peaked at this phase. Differences in heterogeneity cycles among these species groups implies that structuring processes act on different temporal scales for vascular plants as compered to cryptogams along the successional gradient in grasslands after ploughing. 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Since the 1950s, such cultivation have been an important part of the agroecosystem in subalpine areas in Norway, and regularly practised. Today, several former leys are left for grazing management. Plant species diversity and heterogeneity was studied in subalpine grasslands in Valdres, southern Norway (ca. 950 m a.s.l.) at different successional phases after ploughing. Fourteen sites (100 m(2)) varying from recently ploughed grasslands (3-5 years at phase 1) to unploughed sites were used to construct a temporal gradient by a space for time substitution. Small-scale species diversity (0.25 m(2)) of vascular plants increased continuously with the time since last ploughing, while the variation in gamma-diversity was minor among late successional phases 3-5 (&gt;23-28 years, 32-39 years and unploughed sites) after an evident increase from phase 1-3. The number of exclusive species peaked within unploughed sites (10), and included perennial herbs (Antennaria alpina, Hieracium auricula, Viola canina), spore-producing species (Botrychium lunaria, Selaginella selagionides) and woody life-forms. Species diversity of cryptogams was low at both a small and large scale within successional phases 1 and 2 (&lt;12 years). Small scale cryptogam diversity peaked at the unploughed sites, while gamma diversity peaked at phase 3(23-28 years). This intermediate phase 3 also had the highest number of exclusive species (12) which exceeded unploughed sites (8). A coarse spatial structure of cryptogams at phase 3 was indicated by a low mean of species distribution. The soil of uncultivated grasslands (phase 5) was, at the end of the growing season (mid August), quite base-rich with a higher content for all measured nutrients as compared to intermediate phases of continuity (phase 3 and 4) The exception was nitrate which was not detectable from phase 3 to 5, and available phosphate which peaked at an intermediate phase of succession (phase 3 and 4). Heterogeneity of vascular plants reached a minimum value at the intermediate phase (3) while cryptogam heterogeneity peaked at this phase. Differences in heterogeneity cycles among these species groups implies that structuring processes act on different temporal scales for vascular plants as compered to cryptogams along the successional gradient in grasslands after ploughing. 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Since the 1950s, such cultivation have been an important part of the agroecosystem in subalpine areas in Norway, and regularly practised. Today, several former leys are left for grazing management. Plant species diversity and heterogeneity was studied in subalpine grasslands in Valdres, southern Norway (ca. 950 m a.s.l.) at different successional phases after ploughing. Fourteen sites (100 m(2)) varying from recently ploughed grasslands (3-5 years at phase 1) to unploughed sites were used to construct a temporal gradient by a space for time substitution. Small-scale species diversity (0.25 m(2)) of vascular plants increased continuously with the time since last ploughing, while the variation in gamma-diversity was minor among late successional phases 3-5 (&gt;23-28 years, 32-39 years and unploughed sites) after an evident increase from phase 1-3. The number of exclusive species peaked within unploughed sites (10), and included perennial herbs (Antennaria alpina, Hieracium auricula, Viola canina), spore-producing species (Botrychium lunaria, Selaginella selagionides) and woody life-forms. Species diversity of cryptogams was low at both a small and large scale within successional phases 1 and 2 (&lt;12 years). Small scale cryptogam diversity peaked at the unploughed sites, while gamma diversity peaked at phase 3(23-28 years). This intermediate phase 3 also had the highest number of exclusive species (12) which exceeded unploughed sites (8). A coarse spatial structure of cryptogams at phase 3 was indicated by a low mean of species distribution. The soil of uncultivated grasslands (phase 5) was, at the end of the growing season (mid August), quite base-rich with a higher content for all measured nutrients as compared to intermediate phases of continuity (phase 3 and 4) The exception was nitrate which was not detectable from phase 3 to 5, and available phosphate which peaked at an intermediate phase of succession (phase 3 and 4). Heterogeneity of vascular plants reached a minimum value at the intermediate phase (3) while cryptogam heterogeneity peaked at this phase. Differences in heterogeneity cycles among these species groups implies that structuring processes act on different temporal scales for vascular plants as compered to cryptogams along the successional gradient in grasslands after ploughing. The importance of continuity in management for plant biodiversity in subalpine grasslands is finally discussed from a conservation point of view.</abstract><cop>Dordrecht</cop><pub>Kluwer Publishers</pub><doi>10.1023/A:1009804509239</doi><tpages>16</tpages></addata></record>
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ispartof Plant ecology, 1999-11, Vol.145 (1), p.59-74
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1573-5052
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source Springer Link; JSTOR
subjects Agricultural ecosystems
Biodiversity
botanical composition
Bryophytes
Cryptogams
Cultivation
ecological succession
Flowers & plants
Grasses
Grassland management
Grasslands
grazing
Growing season
Heterogeneity
land use
Lichens
nitrates
Norway
Pasture management
patterns
phosphates
Plant communities
Plant diversity
Plant ecology
Plant species
Plants
Plowing
range management
soil chemistry
soil fertility
spatial distribution
Species
Species diversity
subalpine grasslands
Vascular plants
title How does continuity in grassland management after ploughing affect plant community patterns?
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