Grassland afforestation impact on primary productivity a remote sensing approach
Question: How is the magnitude and seasonality of carbon uptake affected by the replacement of native grasslands by eucalyptus plantations? Location: Río de la Plata Grasslands in Argentina and Uruguay. Methods: A total of 115 paired sites of fast-growing Eucalyptus grandis plantations and adjacent grasslands were used to characterize the magnitude and seasonality of [1] radiation interception by canopies and [2] above-ground net primary productivity based on a time series of MODIS-derived normalized difference vegetation index [NDVI]. The response of NDVI to precipitation was explored across temporal scales. Results: NDVI in afforested vs. grassland plots presented higher annual averages [1.3-fold], lower seasonal ranges [average relative range of 0.11 vs. 0.29] and delayed growing seasons [2-month shift]. Temporally, NDVI was positively associated with precipitation input, showing a correlation with longer periods of precipitation accumulation in tree plantations compared to grasslands [greather than 7 vs. 2-3 months]. Estimated average annual above-ground net primary productivity [ANPP] almost quadrupled as a consequence of replacing grasslands by tree plantations [&4 vs. &17Â Mg dry matter. ha-1.·yr-1], and this difference was evidenced throughout the whole study period. Conclusions: Afforested grasslands intercept more radiation and have higher and more stable ANPP throughout the year, probably as a result of major changes in leaf phenology and root distribution patterns, which in turn allowed better access to water. Changes in carbon uptake can influence climate/biosphere feedbacks and should be considered in land-use planning, especially when grassland afforestation is recommended as a tool to mitigate global warming.
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| Subjects: | ANPP, LAND-USE CHANGE, MODIS, NDVI, RIO DE LA PLATA GRASSLANDS, TREE PLANTATIONS, EUCALYPTUS, EUCALYPTUS GRANDIS, |
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KOHA-OAI-AGRO:469402023-11-16T14:25:15Zhttp://ceiba.agro.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=46940AAGGrassland afforestation impact on primary productivity a remote sensing approachVassallo, María MercedesDieguez, HernánGarbulsky, Martín FabioJobbágy, Esteban G.Paruelo, José Maríatextengapplication/pdfQuestion: How is the magnitude and seasonality of carbon uptake affected by the replacement of native grasslands by eucalyptus plantations? Location: Río de la Plata Grasslands in Argentina and Uruguay. Methods: A total of 115 paired sites of fast-growing Eucalyptus grandis plantations and adjacent grasslands were used to characterize the magnitude and seasonality of [1] radiation interception by canopies and [2] above-ground net primary productivity based on a time series of MODIS-derived normalized difference vegetation index [NDVI]. The response of NDVI to precipitation was explored across temporal scales. Results: NDVI in afforested vs. grassland plots presented higher annual averages [1.3-fold], lower seasonal ranges [average relative range of 0.11 vs. 0.29] and delayed growing seasons [2-month shift]. Temporally, NDVI was positively associated with precipitation input, showing a correlation with longer periods of precipitation accumulation in tree plantations compared to grasslands [greather than 7 vs. 2-3 months]. Estimated average annual above-ground net primary productivity [ANPP] almost quadrupled as a consequence of replacing grasslands by tree plantations [&4 vs. &17Â Mg dry matter. ha-1.·yr-1], and this difference was evidenced throughout the whole study period. Conclusions: Afforested grasslands intercept more radiation and have higher and more stable ANPP throughout the year, probably as a result of major changes in leaf phenology and root distribution patterns, which in turn allowed better access to water. Changes in carbon uptake can influence climate/biosphere feedbacks and should be considered in land-use planning, especially when grassland afforestation is recommended as a tool to mitigate global warming.Question: How is the magnitude and seasonality of carbon uptake affected by the replacement of native grasslands by eucalyptus plantations? Location: Río de la Plata Grasslands in Argentina and Uruguay. Methods: A total of 115 paired sites of fast-growing Eucalyptus grandis plantations and adjacent grasslands were used to characterize the magnitude and seasonality of [1] radiation interception by canopies and [2] above-ground net primary productivity based on a time series of MODIS-derived normalized difference vegetation index [NDVI]. The response of NDVI to precipitation was explored across temporal scales. Results: NDVI in afforested vs. grassland plots presented higher annual averages [1.3-fold], lower seasonal ranges [average relative range of 0.11 vs. 0.29] and delayed growing seasons [2-month shift]. Temporally, NDVI was positively associated with precipitation input, showing a correlation with longer periods of precipitation accumulation in tree plantations compared to grasslands [greather than 7 vs. 2-3 months]. Estimated average annual above-ground net primary productivity [ANPP] almost quadrupled as a consequence of replacing grasslands by tree plantations [&4 vs. &17Â Mg dry matter. ha-1.·yr-1], and this difference was evidenced throughout the whole study period. Conclusions: Afforested grasslands intercept more radiation and have higher and more stable ANPP throughout the year, probably as a result of major changes in leaf phenology and root distribution patterns, which in turn allowed better access to water. Changes in carbon uptake can influence climate/biosphere feedbacks and should be considered in land-use planning, especially when grassland afforestation is recommended as a tool to mitigate global warming.ANPPLAND-USE CHANGEMODISNDVIRIO DE LA PLATA GRASSLANDSTREE PLANTATIONSEUCALYPTUSEUCALYPTUS GRANDISApplied Vegetation Science |
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ANPP LAND-USE CHANGE MODIS NDVI RIO DE LA PLATA GRASSLANDS TREE PLANTATIONS EUCALYPTUS EUCALYPTUS GRANDIS ANPP LAND-USE CHANGE MODIS NDVI RIO DE LA PLATA GRASSLANDS TREE PLANTATIONS EUCALYPTUS EUCALYPTUS GRANDIS |
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ANPP LAND-USE CHANGE MODIS NDVI RIO DE LA PLATA GRASSLANDS TREE PLANTATIONS EUCALYPTUS EUCALYPTUS GRANDIS ANPP LAND-USE CHANGE MODIS NDVI RIO DE LA PLATA GRASSLANDS TREE PLANTATIONS EUCALYPTUS EUCALYPTUS GRANDIS Vassallo, María Mercedes Dieguez, Hernán Garbulsky, Martín Fabio Jobbágy, Esteban G. Paruelo, José María Grassland afforestation impact on primary productivity a remote sensing approach |
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Question: How is the magnitude and seasonality of carbon uptake affected by the replacement of native grasslands by eucalyptus plantations? Location: Río de la Plata Grasslands in Argentina and Uruguay. Methods: A total of 115 paired sites of fast-growing Eucalyptus grandis plantations and adjacent grasslands were used to characterize the magnitude and seasonality of [1] radiation interception by canopies and [2] above-ground net primary productivity based on a time series of MODIS-derived normalized difference vegetation index [NDVI]. The response of NDVI to precipitation was explored across temporal scales. Results: NDVI in afforested vs. grassland plots presented higher annual averages [1.3-fold], lower seasonal ranges [average relative range of 0.11 vs. 0.29] and delayed growing seasons [2-month shift]. Temporally, NDVI was positively associated with precipitation input, showing a correlation with longer periods of precipitation accumulation in tree plantations compared to grasslands [greather than 7 vs. 2-3 months]. Estimated average annual above-ground net primary productivity [ANPP] almost quadrupled as a consequence of replacing grasslands by tree plantations [&4 vs. &17Â Mg dry matter. ha-1.·yr-1], and this difference was evidenced throughout the whole study period. Conclusions: Afforested grasslands intercept more radiation and have higher and more stable ANPP throughout the year, probably as a result of major changes in leaf phenology and root distribution patterns, which in turn allowed better access to water. Changes in carbon uptake can influence climate/biosphere feedbacks and should be considered in land-use planning, especially when grassland afforestation is recommended as a tool to mitigate global warming. |
| format |
Texto |
| topic_facet |
ANPP LAND-USE CHANGE MODIS NDVI RIO DE LA PLATA GRASSLANDS TREE PLANTATIONS EUCALYPTUS EUCALYPTUS GRANDIS |
| author |
Vassallo, María Mercedes Dieguez, Hernán Garbulsky, Martín Fabio Jobbágy, Esteban G. Paruelo, José María |
| author_facet |
Vassallo, María Mercedes Dieguez, Hernán Garbulsky, Martín Fabio Jobbágy, Esteban G. Paruelo, José María |
| author_sort |
Vassallo, María Mercedes |
| title |
Grassland afforestation impact on primary productivity a remote sensing approach |
| title_short |
Grassland afforestation impact on primary productivity a remote sensing approach |
| title_full |
Grassland afforestation impact on primary productivity a remote sensing approach |
| title_fullStr |
Grassland afforestation impact on primary productivity a remote sensing approach |
| title_full_unstemmed |
Grassland afforestation impact on primary productivity a remote sensing approach |
| title_sort |
grassland afforestation impact on primary productivity a remote sensing approach |
| url |
http://ceiba.agro.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=46940 |
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AT vassallomariamercedes grasslandafforestationimpactonprimaryproductivityaremotesensingapproach AT dieguezhernan grasslandafforestationimpactonprimaryproductivityaremotesensingapproach AT garbulskymartinfabio grasslandafforestationimpactonprimaryproductivityaremotesensingapproach AT jobbagyestebang grasslandafforestationimpactonprimaryproductivityaremotesensingapproach AT paruelojosemaria grasslandafforestationimpactonprimaryproductivityaremotesensingapproach |
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1787218012071264256 |