Long Tree-Ring Chronologies Provide Evidence of Recent Tree Growth Decrease in a Central African Tropical Forest
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{"title"=>"Long tree-ring chronologies provide evidence of recent tree growth decrease in a central african tropical forest", "type"=>"journal", "authors"=>[{"first_name"=>"Giovanna", "last_name"=>"Battipaglia", "scopus_author_id"=>"6507001590"}, {"first_name"=>"Enrica", "last_name"=>"Zalloni", "scopus_author_id"=>"55959961400"}, {"first_name"=>"Simona", "last_name"=>"Castaldi", "scopus_author_id"=>"6602805710"}, {"first_name"=>"Fabio", "last_name"=>"Marzaioli", "scopus_author_id"=>"8852340800"}, {"first_name"=>"Roberto", "last_name"=>"Cazzolla-Gatti", "scopus_author_id"=>"56022184900"}, {"first_name"=>"Bruno", "last_name"=>"Lasserre", "scopus_author_id"=>"8684670500"}, {"first_name"=>"Roberto", "last_name"=>"Tognetti", "scopus_author_id"=>"7004400879"}, {"first_name"=>"Marco", "last_name"=>"Marchetti", "scopus_author_id"=>"57192094610"}, {"first_name"=>"Riccardo", "last_name"=>"Valentini", "scopus_author_id"=>"35410947600"}], "year"=>2015, "source"=>"PLoS ONE", "identifiers"=>{"sgr"=>"84926286882", "doi"=>"10.1371/journal.pone.0120962", "isbn"=>"19326203", "pmid"=>"25806946", "issn"=>"19326203", "scopus"=>"2-s2.0-84926286882", "pui"=>"603466416"}, "id"=>"180d0e87-2c59-3539-94de-2ef19229845f", "abstract"=>"It is still unclear whether the exponential rise of atmospheric CO2 concentration has produced a fertilization effect on tropical forests, thus incrementing their growth rate, in the last two centuries. As many factors affect tree growth patterns, short -term studies might be influenced by the confounding effect of several interacting environmental variables on plant growth. Long-term analyses of tree growth can elucidate long-term trends of plant growth response to dominant drivers. The study of annual rings, applied to long tree-ring chronologies in tropical forest trees enables such analysis. Long-term tree-ring chronologies of three widespread African species were measured in Central Africa to analyze the growth of trees over the last two centuries. Growth trends were correlated to changes in global atmospheric CO2 concentration and local variations in the main climatic drivers, temperature and rainfall. Our results provided no evidence for a fertilization effect of CO2 on tree growth. On the contrary, an overall growth decline was observed for all three species in the last century, which appears to be significantly correlated to the increase in local temperature. These findings provide additional support to the global observations of a slowing down of C sequestration in the trunks of forest trees in recent decades. Data indicate that the CO2 increase alone has not been sufficient to obtain a tree growth increase in tropical trees. The effect of other changing environmental factors, like temperature, may have overridden the fertilization effect of CO2.", "link"=>"http://www.mendeley.com/research/long-treering-chronologies-provide-evidence-recent-tree-growth-decrease-central-african-tropical-for", "reader_count"=>65, "reader_count_by_academic_status"=>{"Unspecified"=>2, "Professor > Associate Professor"=>5, "Librarian"=>1, "Researcher"=>12, "Student > Doctoral Student"=>5, "Student > Ph. D. Student"=>13, "Student > Postgraduate"=>2, "Other"=>4, "Student > Master"=>11, "Student > Bachelor"=>5, "Lecturer"=>2, "Professor"=>3}, "reader_count_by_user_role"=>{"Unspecified"=>2, "Professor > Associate Professor"=>5, "Librarian"=>1, "Researcher"=>12, "Student > Doctoral Student"=>5, "Student > Ph. D. Student"=>13, "Student > Postgraduate"=>2, "Other"=>4, "Student > Master"=>11, "Student > Bachelor"=>5, "Lecturer"=>2, "Professor"=>3}, "reader_count_by_subject_area"=>{"Unspecified"=>9, "Environmental Science"=>23, "Agricultural and Biological Sciences"=>25, "Business, Management and Accounting"=>1, "Computer Science"=>2, "Earth and Planetary Sciences"=>5}, "reader_count_by_subdiscipline"=>{"Earth and Planetary Sciences"=>{"Earth and Planetary Sciences"=>5}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>25}, "Computer Science"=>{"Computer Science"=>2}, "Business, Management and Accounting"=>{"Business, Management and Accounting"=>1}, "Unspecified"=>{"Unspecified"=>9}, "Environmental Science"=>{"Environmental Science"=>23}}, "reader_count_by_country"=>{"Japan"=>1, "Germany"=>1, "India"=>1}, "group_count"=>1}

Scopus | Further Information

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Figshare

  • {"files"=>["https://ndownloader.figshare.com/files/1987253"], "description"=>"<p>Light microscopy views of cross sections of old (a) and juvenile rings (b) of <i>E</i>. <i>cylindricum</i>, of old (c) and juvenile rings (d) of <i>T</i>. <i>scleroxylon</i> and of old (e) and juvenile rings (f) of <i>E</i>. <i>ivorense</i>. Arrows indicate a whole tree ring.</p>", "links"=>[], "tags"=>["Recent Tree Growth Decrease", "CO 2 concentration", "fertilization effect", "tree growth increase", "tree growth", "tree growth patterns", "plant growth response", "CO 2 increase", "forest trees"], "article_id"=>1354752, "categories"=>["Biological Sciences", "Ecology"], "users"=>["Giovanna Battipaglia", "Enrica Zalloni", "Simona Castaldi", "Fabio Marzaioli", "Roberto Cazzolla- Gatti", "Bruno Lasserre", "Roberto Tognetti", "Marco Marchetti", "Riccardo Valentini"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0120962.g002", "stats"=>{"downloads"=>3, "page_views"=>6, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Light_microscopy_views_of_cross_sections_of_the_three_species_/1354752", "title"=>"Light microscopy views of cross-sections of the three species.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2015-03-25 03:43:44"}
  • {"files"=>["https://ndownloader.figshare.com/files/1987247"], "description"=>"<p>Sampling area (black circle) (2°14ʹ59˝N and 16°9ʹ59˝E), located in the Lobeke National Park, in south-eastern of Cameroon (grey area), within the Congo basin.</p>", "links"=>[], "tags"=>["Recent Tree Growth Decrease", "CO 2 concentration", "fertilization effect", "tree growth increase", "tree growth", "tree growth patterns", "plant growth response", "CO 2 increase", "forest trees"], "article_id"=>1354746, "categories"=>["Biological Sciences", "Ecology"], "users"=>["Giovanna Battipaglia", "Enrica Zalloni", "Simona Castaldi", "Fabio Marzaioli", "Roberto Cazzolla- Gatti", "Bruno Lasserre", "Roberto Tognetti", "Marco Marchetti", "Riccardo Valentini"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0120962.g001", "stats"=>{"downloads"=>2, "page_views"=>6, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Sampling_area_/1354746", "title"=>"Sampling area.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2015-03-25 03:43:44"}
  • {"files"=>["https://ndownloader.figshare.com/files/1987260"], "description"=>"<p>Temperature anomalies (a) and mean annual precipitation (b) for the period 1900–2000. Trend-lines and the corresponding r values are reported (straight black lines.).</p>", "links"=>[], "tags"=>["Recent Tree Growth Decrease", "CO 2 concentration", "fertilization effect", "tree growth increase", "tree growth", "tree growth patterns", "plant growth response", "CO 2 increase", "forest trees"], "article_id"=>1354759, "categories"=>["Biological Sciences", "Ecology"], "users"=>["Giovanna Battipaglia", "Enrica Zalloni", "Simona Castaldi", "Fabio Marzaioli", "Roberto Cazzolla- Gatti", "Bruno Lasserre", "Roberto Tognetti", "Marco Marchetti", "Riccardo Valentini"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0120962.g008", "stats"=>{"downloads"=>2, "page_views"=>9, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Temperature_anomalies_and_mean_annual_precipitation_/1354759", "title"=>"Temperature anomalies and mean annual precipitation.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2015-03-25 03:43:44"}
  • {"files"=>["https://ndownloader.figshare.com/files/1987261"], "description"=>"<p>Descriptive statistics for raw and standard chronologies of <i>E</i>. <i>cylindricum</i>, <i>T</i>. <i>scleroxylon</i> and <i>E</i>. <i>ivorense</i>. MRWtot = Mean Ring Width of the entire raw mean chronology; MRW1800–2000 = Mean Ring Width of raw mean chronology relative to the period from 1800 to 2000; SD = Standard Deviation; MS = Mean Sensitivity; Glk = Gleichläufigkeit; SI = series intercorrelation; RBAR = mean r bar; EPS = Expressed Population Signal.</p><p>Descriptive statistics for raw and standard chronologies of the three species.</p>", "links"=>[], "tags"=>["Recent Tree Growth Decrease", "CO 2 concentration", "fertilization effect", "tree growth increase", "tree growth", "tree growth patterns", "plant growth response", "CO 2 increase", "forest trees"], "article_id"=>1354760, "categories"=>["Biological Sciences", "Ecology"], "users"=>["Giovanna Battipaglia", "Enrica Zalloni", "Simona Castaldi", "Fabio Marzaioli", "Roberto Cazzolla- Gatti", "Bruno Lasserre", "Roberto Tognetti", "Marco Marchetti", "Riccardo Valentini"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0120962.t001", "stats"=>{"downloads"=>2, "page_views"=>25, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Descriptive_statistics_for_raw_and_standard_chronologies_of_the_three_species_/1354760", "title"=>"Descriptive statistics for raw and standard chronologies of the three species.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2015-03-25 03:43:44"}
  • {"files"=>["https://ndownloader.figshare.com/files/1987259"], "description"=>"<p>BAI (black circle) and CO<sub>2</sub> concentration (white circle) data grouped into 50-year intervals for <i>E</i>. <i>cylindricum (a)</i> and <i>T</i>. <i>scleroxylon</i> (b) for the period 1800–2000. BAI and CO<sub>2</sub> concentration data grouped into 20-year intervals for <i>E</i>. <i>ivorense</i> (c) for the period 1900–2000. Different letters correspond to significantly different values for BAI and CO<sub>2</sub> between different grouped years.</p>", "links"=>[], "tags"=>["Recent Tree Growth Decrease", "CO 2 concentration", "fertilization effect", "tree growth increase", "tree growth", "tree growth patterns", "plant growth response", "CO 2 increase", "forest trees"], "article_id"=>1354758, "categories"=>["Biological Sciences", "Ecology"], "users"=>["Giovanna Battipaglia", "Enrica Zalloni", "Simona Castaldi", "Fabio Marzaioli", "Roberto Cazzolla- Gatti", "Bruno Lasserre", "Roberto Tognetti", "Marco Marchetti", "Riccardo Valentini"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0120962.g007", "stats"=>{"downloads"=>1, "page_views"=>8, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Basal_area_and_CO_2_concentration_data_of_the_three_species_/1354758", "title"=>"Basal area and CO<sub>2</sub> concentration data of the three species.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2015-03-25 03:43:44"}
  • {"files"=>["https://ndownloader.figshare.com/files/1987256"], "description"=>"<p>(a) Ring width chronologies of <i>T</i>. <i>scleroxylon</i> with mean chronology (black line) using raw data of average increment rates per tree. (b) Average ring width chronology (n = 25) with standard deviation (SD) of <i>T</i>. <i>scleroxylon</i> after detrending. The number of samples is reported.</p>", "links"=>[], "tags"=>["Recent Tree Growth Decrease", "CO 2 concentration", "fertilization effect", "tree growth increase", "tree growth", "tree growth patterns", "plant growth response", "CO 2 increase", "forest trees"], "article_id"=>1354755, "categories"=>["Biological Sciences", "Ecology"], "users"=>["Giovanna Battipaglia", "Enrica Zalloni", "Simona Castaldi", "Fabio Marzaioli", "Roberto Cazzolla- Gatti", "Bruno Lasserre", "Roberto Tognetti", "Marco Marchetti", "Riccardo Valentini"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0120962.g004", "stats"=>{"downloads"=>0, "page_views"=>12, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Ring_width_chronologies_of_T_scleroxylon_/1354755", "title"=>"Ring width chronologies of <i>T</i>. <i>scleroxylon</i>.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2015-03-25 03:43:44"}
  • {"files"=>["https://ndownloader.figshare.com/files/1987255"], "description"=>"<p>(a) Ring width chronologies of <i>E</i>. <i>cylindricum</i> with mean chronology (black line) using raw data of average increment rates per tree. (b) Average ring width chronology (n = 25) with standard deviation (SD) of <i>E</i>. <i>cylindricum</i> after detrending. The number of samples is reported.</p>", "links"=>[], "tags"=>["Recent Tree Growth Decrease", "CO 2 concentration", "fertilization effect", "tree growth increase", "tree growth", "tree growth patterns", "plant growth response", "CO 2 increase", "forest trees"], "article_id"=>1354754, "categories"=>["Biological Sciences", "Ecology"], "users"=>["Giovanna Battipaglia", "Enrica Zalloni", "Simona Castaldi", "Fabio Marzaioli", "Roberto Cazzolla- Gatti", "Bruno Lasserre", "Roberto Tognetti", "Marco Marchetti", "Riccardo Valentini"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0120962.g003", "stats"=>{"downloads"=>4, "page_views"=>11, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Ring_width_chronologies_of_E_cylindricum_/1354754", "title"=>"Ring width chronologies of <i>E</i>. <i>cylindricum</i>.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2015-03-25 03:43:44"}
  • {"files"=>["https://ndownloader.figshare.com/files/1987273", "https://ndownloader.figshare.com/files/1987274", "https://ndownloader.figshare.com/files/1987275", "https://ndownloader.figshare.com/files/1987276", "https://ndownloader.figshare.com/files/1987277", "https://ndownloader.figshare.com/files/1987278", "https://ndownloader.figshare.com/files/1987279", "https://ndownloader.figshare.com/files/1987280"], "description"=>"<div><p>It is still unclear whether the exponential rise of atmospheric CO<sub>2</sub> concentration has produced a fertilization effect on tropical forests, thus incrementing their growth rate, in the last two centuries. As many factors affect tree growth patterns, short -term studies might be influenced by the confounding effect of several interacting environmental variables on plant growth. Long-term analyses of tree growth can elucidate long-term trends of plant growth response to dominant drivers. The study of annual rings, applied to long tree-ring chronologies in tropical forest trees enables such analysis. Long-term tree-ring chronologies of three widespread African species were measured in Central Africa to analyze the growth of trees over the last two centuries. Growth trends were correlated to changes in global atmospheric CO<sub>2</sub> concentration and local variations in the main climatic drivers, temperature and rainfall. Our results provided no evidence for a fertilization effect of CO<sub>2</sub> on tree growth. On the contrary, an overall growth decline was observed for all three species in the last century, which appears to be significantly correlated to the increase in local temperature. These findings provide additional support to the global observations of a slowing down of C sequestration in the trunks of forest trees in recent decades. Data indicate that the CO<sub>2</sub> increase alone has not been sufficient to obtain a tree growth increase in tropical trees. The effect of other changing environmental factors, like temperature, may have overridden the fertilization effect of CO<sub>2</sub>.</p></div>", "links"=>[], "tags"=>["Recent Tree Growth Decrease", "CO 2 concentration", "fertilization effect", "tree growth increase", "tree growth", "tree growth patterns", "plant growth response", "CO 2 increase", "forest trees"], "article_id"=>1354767, "categories"=>["Biological Sciences", "Ecology"], "users"=>["Giovanna Battipaglia", "Enrica Zalloni", "Simona Castaldi", "Fabio Marzaioli", "Roberto Cazzolla- Gatti", "Bruno Lasserre", "Roberto Tognetti", "Marco Marchetti", "Riccardo Valentini"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0120962.s001", "https://dx.doi.org/10.1371/journal.pone.0120962.s002", "https://dx.doi.org/10.1371/journal.pone.0120962.s003", "https://dx.doi.org/10.1371/journal.pone.0120962.s004", "https://dx.doi.org/10.1371/journal.pone.0120962.s005", "https://dx.doi.org/10.1371/journal.pone.0120962.s006", "https://dx.doi.org/10.1371/journal.pone.0120962.s007", "https://dx.doi.org/10.1371/journal.pone.0120962.s008"], "stats"=>{"downloads"=>6, "page_views"=>15, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Long_Tree_Ring_Chronologies_Provide_Evidence_of_Recent_Tree_Growth_Decrease_in_a_Central_African_Tropical_Forest_/1354767", "title"=>"Long Tree-Ring Chronologies Provide Evidence of Recent Tree Growth Decrease in a Central African Tropical Forest", "pos_in_sequence"=>0, "defined_type"=>4, "published_date"=>"2015-03-25 03:43:44"}
  • {"files"=>["https://ndownloader.figshare.com/files/1987258"], "description"=>"<p>Full symbols represent the 50- year cumulative average basal area of <i>E</i>. <i>cylindricum</i> (a) and <i>T</i>. <i>scleroxylon</i> (b) and 20 years for <i>E</i>. <i>ivorense</i> (c). The continuous line represents the weighted best fit linear interpolation with the dashed lines defining the confidence interval of the fit (see text for details)</p>", "links"=>[], "tags"=>["Recent Tree Growth Decrease", "CO 2 concentration", "fertilization effect", "tree growth increase", "tree growth", "tree growth patterns", "plant growth response", "CO 2 increase", "forest trees"], "article_id"=>1354757, "categories"=>["Biological Sciences", "Ecology"], "users"=>["Giovanna Battipaglia", "Enrica Zalloni", "Simona Castaldi", "Fabio Marzaioli", "Roberto Cazzolla- Gatti", "Bruno Lasserre", "Roberto Tognetti", "Marco Marchetti", "Riccardo Valentini"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0120962.g006", "stats"=>{"downloads"=>0, "page_views"=>9, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Cumulative_average_basal_area_for_the_three_species_/1354757", "title"=>"Cumulative average basal area for the three species.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2015-03-25 03:43:44"}
  • {"files"=>["https://ndownloader.figshare.com/files/1987257"], "description"=>"<p>(a) Ring width chronologies of <i>E</i>. <i>ivorense</i> with mean chronology (black line) using raw data of average increment rates per tree. (b) Average ring width chronology (n = 15) with standard deviation (SD) of <i>E</i>. <i>ivorense</i> after detrending. The number of samples is reported.</p>", "links"=>[], "tags"=>["Recent Tree Growth Decrease", "CO 2 concentration", "fertilization effect", "tree growth increase", "tree growth", "tree growth patterns", "plant growth response", "CO 2 increase", "forest trees"], "article_id"=>1354756, "categories"=>["Biological Sciences", "Ecology"], "users"=>["Giovanna Battipaglia", "Enrica Zalloni", "Simona Castaldi", "Fabio Marzaioli", "Roberto Cazzolla- Gatti", "Bruno Lasserre", "Roberto Tognetti", "Marco Marchetti", "Riccardo Valentini"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0120962.g005", "stats"=>{"downloads"=>2, "page_views"=>7, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Ring_width_chronologies_of_E_ivorense_/1354756", "title"=>"Ring width chronologies of <i>E</i>. <i>ivorense</i>.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2015-03-25 03:43:44"}

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  • {"unique-ip"=>"15", "full-text"=>"19", "pdf"=>"1", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"4", "cited-by"=>"0", "year"=>"2020", "month"=>"2"}
  • {"unique-ip"=>"20", "full-text"=>"20", "pdf"=>"3", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2020", "month"=>"3"}
  • {"unique-ip"=>"17", "full-text"=>"18", "pdf"=>"3", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2020", "month"=>"4"}
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  • {"unique-ip"=>"20", "full-text"=>"12", "pdf"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"9", "cited-by"=>"0", "year"=>"2020", "month"=>"7"}
  • {"unique-ip"=>"17", "full-text"=>"13", "pdf"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"1", "cited-by"=>"0", "year"=>"2020", "month"=>"8"}
  • {"unique-ip"=>"17", "full-text"=>"24", "pdf"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2020", "month"=>"9"}
  • {"unique-ip"=>"25", "full-text"=>"22", "pdf"=>"1", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2020", "month"=>"10"}
  • {"unique-ip"=>"18", "full-text"=>"19", "pdf"=>"4", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"5", "cited-by"=>"0", "year"=>"2020", "month"=>"11"}
  • {"unique-ip"=>"12", "full-text"=>"10", "pdf"=>"4", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"1", "cited-by"=>"0", "year"=>"2020", "month"=>"12"}
  • {"unique-ip"=>"6", "full-text"=>"6", "pdf"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2021", "month"=>"1"}

Relative Metric

{"start_date"=>"2015-01-01T00:00:00Z", "end_date"=>"2015-12-31T00:00:00Z", "subject_areas"=>[]}

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