Nitrogen Addition Regulates Soil Nematode Community Composition through Ammonium Suppression
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{"title"=>"Nitrogen Addition Regulates Soil Nematode Community Composition through Ammonium Suppression", "type"=>"journal", "authors"=>[{"first_name"=>"Cunzheng", "last_name"=>"Wei", "scopus_author_id"=>"36496202600"}, {"first_name"=>"Huifen", "last_name"=>"Zheng", "scopus_author_id"=>"55349331000"}, {"first_name"=>"Qi", "last_name"=>"Li", "scopus_author_id"=>"36062654700"}, {"first_name"=>"Xiaotao", "last_name"=>"Lü", "scopus_author_id"=>"7404839302"}, {"first_name"=>"Qiang", "last_name"=>"Yu", "scopus_author_id"=>"57193341217"}, {"first_name"=>"Haiyang", "last_name"=>"Zhang", "scopus_author_id"=>"57015854300"}, {"first_name"=>"Quansheng", "last_name"=>"Chen", "scopus_author_id"=>"55696090500"}, {"first_name"=>"Nianpeng", "last_name"=>"He", "scopus_author_id"=>"8701261200"}, {"first_name"=>"Paul", "last_name"=>"Kardol", "scopus_author_id"=>"9941058700"}, {"first_name"=>"Wenju", "last_name"=>"Liang", "scopus_author_id"=>"7402026767"}, {"first_name"=>"Xingguo", "last_name"=>"Han", "scopus_author_id"=>"7402400922"}], "year"=>2012, "source"=>"PLoS ONE", "identifiers"=>{"issn"=>"19326203", "pui"=>"365552127", "doi"=>"10.1371/journal.pone.0043384", "sgr"=>"84865629143", "scopus"=>"2-s2.0-84865629143", "isbn"=>"1932-6203", "pmid"=>"22952671"}, "id"=>"6aa2d25e-79a0-374f-911f-c26de3b82001", "abstract"=>"Nitrogen (N) enrichment resulting from anthropogenic activities has greatly changed the composition and functioning of soil communities. Nematodes are one of the most abundant and diverse groups of soil organisms, and they occupy key trophic positions in the soil detritus food web. Nematodes have therefore been proposed as useful indicators for shifts in soil ecosystem functioning under N enrichment. Here, we monitored temporal dynamics of the soil nematode community using a multi-level N addition experiment in an Inner Mongolia grassland. Measurements were made three years after the start of the experiment. We used structural equation modeling (SEM) to explore the mechanisms regulating nematode responses to N enrichment. Across the N enrichment gradient, significant reductions in total nematode abundance, diversity (H' and taxonomic richness), maturity index (MI), and the abundance of root herbivores, fungivores and omnivores-predators were found in August. Root herbivores recovered in September, contributing to the temporal variation of total nematode abundance across the N gradient. Bacterivores showed a hump-shaped relationship with N addition rate, both in August and September. Ammonium concentration was negatively correlated with the abundance of total and herbivorous nematodes in August, but not in September. Ammonium suppression explained 61% of the variation in nematode richness and 43% of the variation in nematode trophic group composition. Ammonium toxicity may occur when herbivorous nematodes feed on root fluid, providing a possible explanation for the negative relationship between herbivorous nematodes and ammonium concentration in August. We found a significantly positive relationship between fungivores and fungal phospholipid fatty acids (PLFA), suggesting bottom-up control of fungivores. No such relationship was found between bacterivorous nematodes and bacterial PLFA. Our findings contribute to the understanding of effects of N enrichment in semiarid grassland on soil nematode trophic groups, and the cascading effects in the detrital soil food web.", "link"=>"http://www.mendeley.com/research/nitrogen-addition-regulates-soil-nematode-community-composition-through-ammonium-suppression", "reader_count"=>50, "reader_count_by_academic_status"=>{"Unspecified"=>1, "Professor > Associate Professor"=>7, "Researcher"=>9, "Student > Doctoral Student"=>5, "Student > Ph. D. Student"=>13, "Student > Postgraduate"=>1, "Student > Master"=>5, "Student > Bachelor"=>4, "Lecturer"=>2, "Professor"=>2, "Other"=>1}, "reader_count_by_user_role"=>{"Unspecified"=>1, "Professor > Associate Professor"=>7, "Researcher"=>9, "Student > Doctoral Student"=>5, "Student > Ph. D. Student"=>13, "Student > Postgraduate"=>1, "Student > Master"=>5, "Student > Bachelor"=>4, "Lecturer"=>2, "Professor"=>2, "Other"=>1}, "reader_count_by_subject_area"=>{"Unspecified"=>6, "Environmental Science"=>14, "Materials Science"=>1, "Agricultural and Biological Sciences"=>27, "Chemistry"=>1, "Earth and Planetary Sciences"=>1}, "reader_count_by_subdiscipline"=>{"Materials Science"=>{"Materials Science"=>1}, "Chemistry"=>{"Chemistry"=>1}, "Earth and Planetary Sciences"=>{"Earth and Planetary Sciences"=>1}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>27}, "Unspecified"=>{"Unspecified"=>6}, "Environmental Science"=>{"Environmental Science"=>14}}, "reader_count_by_country"=>{"Sweden"=>1, "Belgium"=>1, "China"=>1, "Mexico"=>1, "India"=>1}, "group_count"=>1}

Scopus | Further Information

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Figshare

  • {"files"=>["https://ndownloader.figshare.com/files/307405", "https://ndownloader.figshare.com/files/307458", "https://ndownloader.figshare.com/files/307512", "https://ndownloader.figshare.com/files/307580", "https://ndownloader.figshare.com/files/307644", "https://ndownloader.figshare.com/files/307713", "https://ndownloader.figshare.com/files/307792", "https://ndownloader.figshare.com/files/307863"], "description"=>"<div><p>Nitrogen (N) enrichment resulting from anthropogenic activities has greatly changed the composition and functioning of soil communities. Nematodes are one of the most abundant and diverse groups of soil organisms, and they occupy key trophic positions in the soil detritus food web. Nematodes have therefore been proposed as useful indicators for shifts in soil ecosystem functioning under N enrichment. Here, we monitored temporal dynamics of the soil nematode community using a multi-level N addition experiment in an Inner Mongolia grassland. Measurements were made three years after the start of the experiment. We used structural equation modeling (SEM) to explore the mechanisms regulating nematode responses to N enrichment. Across the N enrichment gradient, significant reductions in total nematode abundance, diversity (H' and taxonomic richness), maturity index (MI), and the abundance of root herbivores, fungivores and omnivores-predators were found in August. Root herbivores recovered in September, contributing to the temporal variation of total nematode abundance across the N gradient. Bacterivores showed a hump-shaped relationship with N addition rate, both in August and September. Ammonium concentration was negatively correlated with the abundance of total and herbivorous nematodes in August, but not in September. Ammonium suppression explained 61% of the variation in nematode richness and 43% of the variation in nematode trophic group composition. Ammonium toxicity may occur when herbivorous nematodes feed on root fluid, providing a possible explanation for the negative relationship between herbivorous nematodes and ammonium concentration in August. We found a significantly positive relationship between fungivores and fungal phospholipid fatty acids (PLFA), suggesting bottom-up control of fungivores. No such relationship was found between bacterivorous nematodes and bacterial PLFA. Our findings contribute to the understanding of effects of N enrichment in semiarid grassland on soil nematode trophic groups, and the cascading effects in the detrital soil food web.</p> </div>", "links"=>[], "tags"=>["nitrogen", "regulates", "nematode", "ammonium", "suppression"], "article_id"=>120648, "categories"=>["Ecology"], "users"=>["Cunzheng Wei", "Huifen Zheng", "Qi Li", "Xiaotao Lü", "Qiang Yu", "Haiyang Zhang", "Quansheng Chen", "Nianpeng He", "Paul Kardol", "Wenju Liang", "Xingguo Han"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0043384.s001", "https://dx.doi.org/10.1371/journal.pone.0043384.s002", "https://dx.doi.org/10.1371/journal.pone.0043384.s003", "https://dx.doi.org/10.1371/journal.pone.0043384.s004", "https://dx.doi.org/10.1371/journal.pone.0043384.s005", "https://dx.doi.org/10.1371/journal.pone.0043384.s006", "https://dx.doi.org/10.1371/journal.pone.0043384.s007", "https://dx.doi.org/10.1371/journal.pone.0043384.s008"], "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/Nitrogen_Addition_Regulates_Soil_Nematode_Community_Composition_through_Ammonium_Suppression/120648", "title"=>"Nitrogen Addition Regulates Soil Nematode Community Composition through Ammonium Suppression", "pos_in_sequence"=>0, "defined_type"=>4, "published_date"=>"2012-08-31 00:10:48"}
  • {"files"=>["https://ndownloader.figshare.com/files/582587"], "description"=>"<p>Data are mean ± S.E. (N = 6). Regression parameters were estimated using log-linear models with N treatment as a continuous predictor. Significant regressions are reported as <i>P</i><0.05*, <i>P</i><0.01**, <i>P</i><0.001***.</p>", "links"=>[], "tags"=>["ammonium", "nitrate", "ph", "treatments", "august", "september"], "article_id"=>253065, "categories"=>["Ecology"], "users"=>["Cunzheng Wei", "Huifen Zheng", "Qi Li", "Xiaotao Lü", "Qiang Yu", "Haiyang Zhang", "Quansheng Chen", "Nianpeng He", "Paul Kardol", "Wenju Liang", "Xingguo Han"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0043384.g001"], "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Soil_ammonium_NH_4_nitrate_NO_3_8722_concentration_and_pH_for_Control_and_N_addition_treatments_in_July_August_and_September_2009_/253065", "title"=>"Soil ammonium (NH<sub>4</sub><sup>+</sup>), nitrate (NO<sub>3</sub><sup>−</sup>) concentration, and pH for Control and N addition treatments in July, August and September 2009.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2012-08-31 00:51:05"}
  • {"files"=>["https://ndownloader.figshare.com/files/582692"], "description"=>"<p>Data are means ± S.E. Linear regressions best fitted the data; regression coefficients are reported if <i>P</i><0.05.</p>", "links"=>[], "tags"=>["nematode", "taxon", "richness", "maturity", "august", "september"], "article_id"=>253166, "categories"=>["Ecology"], "users"=>["Cunzheng Wei", "Huifen Zheng", "Qi Li", "Xiaotao Lü", "Qiang Yu", "Haiyang Zhang", "Quansheng Chen", "Nianpeng He", "Paul Kardol", "Wenju Liang", "Xingguo Han"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0043384.g002"], "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Response_of_soil_nematode_abundance_diversity_H_taxon_richness_S_and_maturity_index_MI_to_N_addition_in_August_and_September_2009_/253166", "title"=>"Response of soil nematode abundance, diversity (H'), taxon richness (S), and maturity index (MI) to N addition in August and September 2009.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2012-08-31 00:52:46"}
  • {"files"=>["https://ndownloader.figshare.com/files/582780"], "description"=>"<p>Data are means ± S.E.. R<sup>2</sup> values were determined using polynomial and exponential decay regressions. Regression coefficients of the best-fitting models are reported if <i>P</i><0.05.</p>", "links"=>[], "tags"=>["nematode", "tropic", "groups", "august", "september"], "article_id"=>253257, "categories"=>["Ecology"], "users"=>["Cunzheng Wei", "Huifen Zheng", "Qi Li", "Xiaotao Lü", "Qiang Yu", "Haiyang Zhang", "Quansheng Chen", "Nianpeng He", "Paul Kardol", "Wenju Liang", "Xingguo Han"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0043384.g003"], "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Response_of_nematode_tropic_groups_to_N_addition_in_August_and_September_2009_/253257", "title"=>"Response of nematode tropic groups to N addition in August and September 2009.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2012-08-31 00:54:17"}
  • {"files"=>["https://ndownloader.figshare.com/files/582881"], "description"=>"<p>The model fit the data well: <i>χ<sup>2</sup><sub>9</sub></i> = 8.286, <i>P</i> = 0.507, AIC = 62.268, RMSEA<0.001. Numbers at arrows are standardized path coefficients (equivalent to correlation coefficients). Width of the arrows indicates the strength of the causal influences: black arrows indicate significant standardized path coefficients (<i>P</i><0.05). Circles indicate error terms (e1–e7). Percentages close to endogenous variables indicate the variance explained by the model (R<sup>2</sup>).</p>", "links"=>[], "tags"=>["physicochemical", "nematode", "richness", "was", "nitrate", "calculated", "july"], "article_id"=>253359, "categories"=>["Ecology"], "users"=>["Cunzheng Wei", "Huifen Zheng", "Qi Li", "Xiaotao Lü", "Qiang Yu", "Haiyang Zhang", "Quansheng Chen", "Nianpeng He", "Paul Kardol", "Wenju Liang", "Xingguo Han"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0043384.g004"], "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Structural_equation_model_of_N_addition_on_soil_physicochemical_factors_plant_community_composition_and_richness_nematode_community_composition_and_richness_August_data_was_used_in_SEM_ammonium_nitrate_concentration_was_calculated_as_the_average_of_July_/253359", "title"=>"Structural equation model of N addition on soil physicochemical factors, plant community composition and richness, nematode community composition and richness (August data was used in SEM; ammonium, nitrate concentration was calculated as the average of July and August).", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2012-08-31 00:55:59"}
  • {"files"=>["https://ndownloader.figshare.com/files/583059"], "description"=>"<p>In August, abundance of herbivorous nematodes correlated negatively with NH<sub>4</sub><sup>+</sup>-concentration.</p>", "links"=>[], "tags"=>["ammonium", "abundance", "herbivorous", "nematodes", "august", "september", "2009", "was", "calculated", "july"], "article_id"=>253523, "categories"=>["Ecology"], "users"=>["Cunzheng Wei", "Huifen Zheng", "Qi Li", "Xiaotao Lü", "Qiang Yu", "Haiyang Zhang", "Quansheng Chen", "Nianpeng He", "Paul Kardol", "Wenju Liang", "Xingguo Han"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0043384.g005"], "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Relationships_between_soil_ammonium_NH_4_concentration_and_abundance_of_herbivorous_nematodes_in_August_and_September_2009_close_circles_August_open_circles_September_ammonium_concentration_was_calculated_as_mean_value_of_July_and_August_August_and_Septe/253523", "title"=>"Relationships between soil ammonium (NH<sub>4</sub><sup>+</sup>) concentration and abundance of herbivorous nematodes in August and September 2009 (close circles: August, open circles: September; ammonium concentration was calculated as mean value of July and August, August and September respectively).", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2012-08-31 00:58:43"}
  • {"files"=>["https://ndownloader.figshare.com/files/583138"], "description"=>"<p>Shown are F-values with significance levels in parentheses. Significant effects (<i>P</i><0.05) are indicated in bold and marginally significant effects are indicated in italic.</p>", "links"=>[], "tags"=>["two-way", "variance", "nematode", "feeding", "abundance", "indices", "sampling"], "article_id"=>253613, "categories"=>["Ecology"], "users"=>["Cunzheng Wei", "Huifen Zheng", "Qi Li", "Xiaotao Lü", "Qiang Yu", "Haiyang Zhang", "Quansheng Chen", "Nianpeng He", "Paul Kardol", "Wenju Liang", "Xingguo Han"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0043384.t001"], "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Results_from_two_way_analysis_of_variance_for_total_and_nematode_feeding_group_abundance_and_nematode_ecological_indices_using_N_treatment_N_sampling_time_T_and_their_interaction_as_fixed_factors_/253613", "title"=>"Results from two-way analysis of variance for total and nematode feeding group abundance and nematode ecological indices using N treatment (N), sampling time (T) and their interaction as fixed factors.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2012-08-31 01:00:13"}

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Relative Metric

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