Asymmetry in above‐ and belowground productivity responses to N addition in a semi‐arid temperate steppe

2019 ◽  
Vol 25 (9) ◽  
pp. 2958-2969 ◽  
Author(s):  
Jing Wang ◽  
Yingzhi Gao ◽  
Yunhai Zhang ◽  
Junjie Yang ◽  
Melinda D. Smith ◽  
...  
Keyword(s):  
N Addition ◽  
Temperate Steppe ◽  
Belowground Productivity ◽  
Semi Arid

Impacts of urea N addition on soil microbial community in a semi-arid temperate steppe in northern China

2008 ◽  
Vol 311 (1-2) ◽  
pp. 19-28 ◽  
Author(s):  
Naili Zhang ◽  
Shiqiang Wan ◽  
Linghao Li ◽  
Jie Bi ◽  
Mingming Zhao ◽  
...  
Keyword(s):  
Microbial Community ◽  
Soil Microbial Community ◽  
Northern China ◽  
N Addition ◽  
Temperate Steppe ◽  
Soil Microbial ◽  
Semi Arid

scholarly journals Effects of water and nitrogen addition on vegetation carbon pools in a semi-arid temperate steppe

2015 ◽  
Vol 27 (3) ◽  
pp. 621-629 ◽  
Author(s):  
Junqiang Jia ◽  
Yunshe Dong ◽  
Yuchun Qi ◽  
Qin Peng ◽  
Xinchao Liu ◽  
...  
Keyword(s):  
Nitrogen Addition ◽  
Carbon Pools ◽  
Temperate Steppe ◽  
Vegetation Carbon ◽  
Semi Arid

Responses of plant 15N natural abundance and isotopic fractionation to N addition reflect the N status of a temperate steppe in China

2018 ◽  
Vol 12 (3) ◽  
pp. 550-563
Author(s):  
Zhilu Sheng ◽  
Yongmei Huang ◽  
Kejian He ◽  
Narigele Borjigin ◽  
Hanyue Yang ◽  
...  
Keyword(s):  
Isotopic Fractionation ◽  
15N Natural Abundance ◽  
Natural Abundance ◽  
N Addition ◽  
Temperate Steppe ◽  
N Status

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.

Soil microbial respiration responses of nitrogen addition: Evidence from a long-time semi-arid grassland soil incubation

2020 ◽  
Author(s):  
Zhaomin Wang ◽  
Zhongmiao Liu ◽  
Binhui Guo ◽  
Zhengchao Qi ◽  
Decao Niu ◽  
...  
Keyword(s):  
Microbial Respiration ◽  
Global Climate ◽  
Nitrogen Concentration ◽  
Terrestrial Ecosystems ◽  
Carbon Pools ◽  
N Addition ◽  
North West ◽  
Soil Microbial ◽  
Soil Microbial Respiration ◽  
Semi Arid

&lt;p&gt;Nitrogen is essential for the synthesis of key cellular compounds such as proteins and nucleic acids in all organisms, and it is one of the limiting elements in most terrestrial ecosystems. During past decades, terrestrial ecosystems nutrients availability have altered with nitrogen deposition increases rapidly so that under the soil microbial metabolism activities terrestrial ecosystem biogeochemical cycles are strongly affected. Therefore, maintaining the stability of soil carbon pools, especially microbial carbon pools has great importance for studying global carbon cycle and global climate change processes. Depending on whether soil microbial has already adapted to the environment nitrogen concentration, there exists different results, such as promotion, inhibition, and no impact. To date, how nitrogen will affect soil microbial respiration still has controversy. To determine the effects, we performed a 59 weeks incubation with the soil which has already treated with Urea for 9 years. The soil has been treated with four N addition levels in a semi-arid grassland where located in North-west part of China. We measured CO&lt;sub&gt;2&lt;/sub&gt; effluxion under different treatments within the same temperature. Our results showed that during the first 8 weeks, soil microbial had strong responses about N addition and N9.2 showed greatest influence with soil microbial respiration. With the time passing, in the time of 9-59 weeks, N0 had highest soil microbial respiration rate while N2.3 was the lowest, this illustrated N2.3 had highest N use efficient (NUE), in order to meet soil microbial stoichiometry, microbial growth became strong C-limitation under the N2.3 treatment. What&amp;#8217;s more, comparing with other studies which we shared same study area, we also found that the time of nitrogen application also had strong effect on soil microbial respiration. These results highlight the importance of microbial respiration and may also help us to have a better understand about how N deposition controls terrestrial C flows.&lt;/p&gt;

scholarly journals Response of plant community composition and productivity to warming and nitrogen deposition in a temperate meadow ecosystem

2014 ◽  
Vol 11 (5) ◽  
pp. 6647-6672 ◽  
Author(s):  
T. Zhang ◽  
R. Guo ◽  
S. Gao ◽  
J. X. Guo ◽  
W. Sun
Keyword(s):  
Species Richness ◽  
Community Composition ◽  
Plant Community ◽  
Plant Productivity ◽  
Plant Community Composition ◽  
Experimental Warming ◽  
N Addition ◽  
Meadow Steppe ◽  
Aboveground Productivity ◽  
Belowground Productivity

Abstract. Climate change has profound influences on plant community composition and ecosystem functions. However, its effects on plant community composition and net primary productivity are not well understood. A field experiment was conducted to examine the effects of warming, nitrogen (N) addition, and their interactions on plant community composition and productivity in a temperate meadow ecosystem in northeast China. Experimental warming significantly increased species richness, evenness and diversity, by contrast, N addition highly reduced species richness, evenness and diversity. Warming reduced the importance value of gramineous species but increased in forbs, N addition had the opposite effect. Warming had a significant positive effect on belowground productivity, but had a negative effect on aboveground biomass. The influences of warming on aboveground productivity were dependent on precipitation. Experimental warming had little effect on aboveground productivity in the years with higher precipitation, but significantly suppressed the growth of aboveground in dry years. Our results suggest that warming had indirect effects on plant productivity via altering water availability. Nitrogen addition significantly increased above- and belowground productivity, suggesting that N is one of the most important limiting factors which determine plant productivity in the studied meadow steppe. Significant interactive effects of warming plus N addition on belowground productivity were also detected. Our observations revealed that climate changes (warming and N deposition) plays significant roles in regulating plant community composition and productivity in temperate meadow steppe.

Rapid plant species loss at high rates and at low frequency of N addition in temperate steppe

2014 ◽  
Vol 20 (11) ◽  
pp. 3520-3529 ◽  
Author(s):  
Yunhai Zhang ◽  
Xiaotao Lü ◽  
Forest Isbell ◽  
Carly Stevens ◽  
Xu Han ◽  
...  
Keyword(s):  
Plant Species ◽  
Low Frequency ◽  
Species Loss ◽  
N Addition ◽  
Temperate Steppe

Interannual variability of soil microbial biomass and respiration in responses to topography, annual burning and N addition in a semiarid temperate steppe

Geoderma ◽  
2010 ◽  
Vol 158 (3-4) ◽  
pp. 259-267 ◽  
Author(s):  
Weixing Liu ◽  
Wenhua Xu ◽  
Jianping Hong ◽  
Shiqiang Wan
Keyword(s):  
Microbial Biomass ◽  
Interannual Variability ◽  
Soil Microbial Biomass ◽  
N Addition ◽  
Temperate Steppe ◽  
Soil Microbial
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