scholarly journals Effects of Increased Nitrogen and Phosphorus Deposition on Offspring Performance of Two Dominant Species in a Temperate Steppe Ecosystem

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Yang Li ◽  
Longyu Hou ◽  
Bing Song ◽  
Liuyi Yang ◽  
Linghao Li
Keyword(s):  
Dominant Species ◽  
Temperate Steppe ◽  
Nitrogen And Phosphorus ◽  
Offspring Performance ◽  
Steppe Ecosystem

scholarly journals Nitrogen and phosphorus addition differentially enhance seed production of dominant species in a temperate steppe

2021 ◽  
Author(s):  
Lei Su ◽  
Mengzhou Liu ◽  
Chengming You ◽  
Qun Guo ◽  
Zhongmin Hu ◽  
...  
Keyword(s):  
Seed Production ◽  
Dominant Species ◽  
Temperate Steppe ◽  
Nitrogen And Phosphorus ◽  
Phosphorus Addition

Seasonal distribution of increased precipitation in maternal environments influences offspring performance of Potentilla tanacetifolia in a temperate steppe ecosystem

2019 ◽  
Vol 12 (4) ◽  
pp. 742-750 ◽  
Author(s):  
Yang Li ◽  
Longyu Hou ◽  
Bing Song ◽  
Shiqiang Wan ◽  
Xiaoqin Sun ◽  
...  
Keyword(s):  
Seasonal Distribution ◽  
Temperate Steppe ◽  
Offspring Performance ◽  
Steppe Ecosystem

scholarly journals Nitrogen enrichment enhances the dominance of grasses over forbs in a temperate steppe ecosystem

2011 ◽  
Vol 8 (8) ◽  
pp. 2341-2350 ◽  
Author(s):  
L. Song ◽  
X. Bao ◽  
X. Liu ◽  
Y. Zhang ◽  
P. Christie ◽  
...  
Keyword(s):  
Species Richness ◽  
Aboveground Biomass ◽  
N Deposition ◽  
Soil Mineral N ◽  
N Addition ◽  
Soil Mineral ◽  
Temperate Steppe ◽  
Mineral N ◽  
N Concentration ◽  
Steppe Ecosystem

Abstract. Chinese grasslands are extensive natural ecosystems that comprise 40 % of the total land area of the country and are sensitive to N deposition. A field experiment with six N rates (0, 30, 60, 120, 240, and 480 kg N ha−1 yr−1) was conducted at Duolun, Inner Mongolia, during 2005 and 2010 to identify some effects of N addition on a temperate steppe ecosystem. The dominant plant species in the plots were divided into two categories, grasses and forbs, on the basis of species life forms. Enhanced N deposition, even as little as 30 kg N ha−1 yr−1 above ambient N deposition (16 kg N ha−1 yr−1), led to a decline in species richness. The cover of grasses increased with N addition rate but their species richness showed a weak change across N treatments. Both species richness and cover of forbs declined strongly with increasing N deposition as shown by linear regression analysis (p < 0.05). Increasing N deposition elevated aboveground production of grasses but lowered aboveground biomass of forbs. Plant N concentration, plant δ15N and soil mineral N increased with N addition, showing positive relationships between plant δ15N and N concentration, soil mineral N and/or applied N rate. The cessation of N application in the 480 kg N ha−1 yr−1 treatment in 2009 and 2010 led to a slight recovery of the forb species richness relative to total cover and aboveground biomass, coinciding with reduced plant N concentration and soil mineral N. The results show N deposition-induced changes in soil N transformations and plant N assimilation that are closely related to changes in species composition and biomass accumulation in this temperate steppe ecosystem.

Grazing effects on the greenhouse gas balance of a temperate steppe ecosystem

2012 ◽  
Vol 93 (3) ◽  
pp. 357-371 ◽  
Author(s):  
Philipp Schönbach ◽  
Benjamin Wolf ◽  
Uta Dickhöfer ◽  
Martin Wiesmeier ◽  
Weiwei Chen ◽  
...  
Keyword(s):  
Greenhouse Gas ◽  
Temperate Steppe ◽  
Greenhouse Gas Balance ◽  
Grazing Effects ◽  
Steppe Ecosystem ◽  
Gas Balance

Leaf photosynthetic responses to nitrogen and phosphorus additions of dominant species in farm-withdrawn grassland in the loess hilly-gully region

2021 ◽  
Vol 41 (13) ◽  
Author(s):  
赖帅彬，徐升，简春霞，陈志飞，周俊杰，杨全，王智，徐炳成 LAI Shuaibin
Keyword(s):  
Dominant Species ◽  
Nitrogen And Phosphorus ◽  
Photosynthetic Responses

Nitrogen and phosphorus additions interactively affected composition and carbon budget of soil nematode community in a temperate steppe

2021 ◽  
Author(s):  
Zhi-Wei Zhang ◽  
Qi Li ◽  
Yan-Yu Hu ◽  
Hai-Wei Wei ◽  
Shuang-Li Hou ◽  
...  
Keyword(s):  
Carbon Budget ◽  
Nematode Community ◽  
Soil Nematode ◽  
Temperate Steppe ◽  
Nitrogen And Phosphorus ◽  
Soil Nematode Community

scholarly journals Transgenerational effect alters the interspecific competition between two dominant species in a temperate steppe

2021 ◽  
Vol 11 (3) ◽  
pp. 1175-1186
Author(s):  
Yang Li ◽  
Longyu Hou ◽  
Liuyi Yang ◽  
Ming Yue
Keyword(s):  
Interspecific Competition ◽  
Dominant Species ◽  
Temperate Steppe ◽  
Transgenerational Effect

scholarly journals Nitrogen enrichment enhances the dominance of grasses over forbs in a temperate steppe ecosystem

2011 ◽  
Vol 8 (3) ◽  
pp. 5057-5082 ◽  
Author(s):  
L. Song ◽  
X. M. Bao ◽  
X. J. Liu ◽  
Y. Zhang ◽  
P. Christie ◽  
...  
Keyword(s):  
Species Richness ◽  
Aboveground Biomass ◽  
N Deposition ◽  
Soil Mineral N ◽  
N Addition ◽  
Soil Mineral ◽  
Temperate Steppe ◽  
Mineral N ◽  
N Concentration ◽  
Steppe Ecosystem

Abstract. Chinese grasslands are extensive natural ecosystems that comprise 40 % of the total land area of the country and are sensitive to N deposition. A field experiment with six N rates (0, 30, 60, 120, 240, and 480 kg N ha−1 yr−1) was conducted at Duolun, Inner Mongolia, during 2005 and 2010 to identify some effects of N addition on a temperature steppe ecosystem. The dominant plant species in the plots were divided into two categories, grasses and forbs, on the basis of species life forms. Enhanced N deposition, even as little as 30 kg N ha−1 yr−1 above ambient N deposition (16 kg N ha−1 yr−1), led to a decline in species richness. The cover of grasses increased with N addition rate but their species richness showed a weak change across N treatments. Both species richness and cover of forbs declined strongly with increasing N deposition as shown by linear regression analysis (p<0.05). Increasing N deposition elevated aboveground production of grasses but lowered aboveground biomass of forbs. Plant N concentration, plant δ15N and soil mineral N increased with N addition, showing positive relationships between plant δ15N and N concentration, soil mineral N and/or applied N rate. The cessation of N application in the 480 kg N ha−1 yr−1 treatment in 2009 and 2010 led to a slight recovery of the forb species richness relative to total cover and aboveground biomass, coinciding with reduced plant N concentration and soil mineral N. The results show that N deposition induced changes in soil N transformations and plant N assimilation that are key to changes in species composition and biomass accumulation in this temperate steppe ecosystem.

scholarly journals Occurrence of Ceratium furcoides (Levander) Langhans 1925 bloom at the Billings Reservoir, São Paulo State, Brazil

2010 ◽  
Vol 70 (3 suppl) ◽  
pp. 825-829 ◽  
Author(s):  
T Matsumura-Tundisi ◽  
JG Tundisi ◽  
AP Luzia ◽  
RM Degani
Keyword(s):  
Water Treatment ◽  
Dissolved Oxygen ◽  
Water Column ◽  
Dominant Species ◽  
Nutrient Concentrations ◽  
Phosphorus Concentration ◽  
Fish Kill ◽  
Nitrogen And Phosphorus ◽  
Paulo State ◽  
Cold Fronts

An unusual bloom of Ceratium furcoides is reported for a station of the Taquacetuba compartment of the Billings Reservoir. The appearance of this bloom is attributed to the mixing and turbulence of the water column that removed Ceratium cysts from the surface of the sediment and promoted conditions for the growth of this species in the region of mixing. Cold fronts approaching the Billings Reservoir are probably the cause of the mixing and bloom. Also turbulence induced by wind increased phosphorus concentration in the water column. Ceratium furcoides was the dominant species at station 1 where the nutrient concentrations of nitrogen and phosphorus were high. Ceratium spp. blooms may be a problem for water treatment and massive mortality can affect the dissolved oxygen of the water producing fish kill.

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