scholarly journals Soil microbial responses to forest floor litter manipulation and nitrogen addition in a mixed-wood forest of northern China

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Xiao-Lu Sun ◽  
Jing Zhao ◽  
Ye-Ming You ◽  
Osbert Jianxin Sun
Keyword(s):  
Forest Floor ◽  
Northern China ◽  
Nitrogen Addition ◽  
Soil Microbial ◽  
Litter Manipulation ◽  
Microbial Responses

Soil Microbial Responses to Experimental Warming and Nitrogen Addition in a Temperate Steppe of Northern China

Pedosphere ◽  
2014 ◽  
Vol 24 (4) ◽  
pp. 427-436 ◽  
Author(s):  
Rui-Chang SHEN ◽  
Ming XU ◽  
Yong-Gang CHI ◽  
Shen YU ◽  
Shi-Qiang WAN
Keyword(s):  
Northern China ◽  
Nitrogen Addition ◽  
Experimental Warming ◽  
Temperate Steppe ◽  
Soil Microbial ◽  
Microbial Responses

Comparison of soil microbial responses to nitrogen addition between ex-arable grassland and natural grassland

2021 ◽  
Vol 21 (3) ◽  
pp. 1371-1384
Author(s):  
Chengcheng Dong ◽  
Wei Wang ◽  
Hongyan Liu ◽  
Xiaotian Xu ◽  
Xinyue Chen ◽  
...  
Keyword(s):  
Nitrogen Addition ◽  
Soil Microbial ◽  
Microbial Responses ◽  
Natural Grassland

scholarly journals Soil microbial responses to nitrogen addition in arid ecosystems

2015 ◽  
Vol 6 ◽  
Author(s):  
Robert L. Sinsabaugh ◽  
Jayne Belnap ◽  
Jennifer Rudgers ◽  
Cheryl R. Kuske ◽  
Noelle Martinez ◽  
...  
Keyword(s):  
Nitrogen Addition ◽  
Arid Ecosystems ◽  
Soil Microbial ◽  
Microbial Responses

scholarly journals Effect of Plant Growth Regulators on Protease Activity in Forest Floor of Norway Spruce Stand

Forests ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 665
Author(s):  
Ladislav Holik ◽  
Jiří Volánek ◽  
Valerie Vranová
Keyword(s):  
Organic Matter ◽  
Proteolytic Activity ◽  
Protease Activity ◽  
Forest Floor ◽  
Soil Microbial Activity ◽  
Inhibitory Effects ◽  
Chlorocholine Chloride ◽  
Soil Microbial ◽  
Native Soil ◽  
Transformation Processes

Soil proteases are involved in organic matter transformation processes and, thus, influence ecosystem nutrient turnovers. Phytohormones, similarly to proteases, are synthesized and secreted into soil by fungi and microorganisms, and regulate plant rhizosphere activity. The aim of this study was to determine the effect of auxins, cytokinins, ethephon, and chlorocholine chloride on spruce forest floor protease activity. It was concluded that the presence of auxins stimulated native proteolytic activity, specifically synthetic auxin 2-naphthoxyacetic acid (16% increase at added quantity of 5 μg) and naturally occurring indole-3-acetic acid (18%, 5 μg). On the contrary, cytokinins, ethephon and chlorocholine chloride inhibited native soil protease activity, where ethephon (36% decrease at 50 μg) and chlorocholine chloride (34%, 100 μg) showed the highest inhibitory effects. It was concluded that negative phytohormonal effects on native proteolytic activity may slow down organic matter decomposition rates and hence complicate plant nutrition. The study enhances the understanding of rhizosphere exudate effects on soil microbial activity and soil nitrogen cycle.

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

Commonwealth of Soil Health: How Do Earthworms Modify the Soil Microbial Responses to CeO2 Nanoparticles?

2021 ◽  
Author(s):  
Wenxing Li ◽  
Peihua Zhang ◽  
Hao Qiu ◽  
Cornelis A. M. Van Gestel ◽  
Willie J. G. M. Peijnenburg ◽  
...  
Keyword(s):  
Soil Health ◽  
Ceo2 Nanoparticles ◽  
Soil Microbial ◽  
Microbial Responses

scholarly journals Early Spring Snowmelt and Summer Droughts Strongly Impair the Resilience of Key Microbial Communities in Subalpine Grassland Ecosystems

2021 ◽  
Author(s):  
Farhan Hafeez ◽  
Lionel Bernard ◽  
Jean-Christophe Clement ◽  
Franck Poly ◽  
Thomas Pommier
Keyword(s):  
Microbial Communities ◽  
Plant Biomass ◽  
Early Spring ◽  
Climatic Extremes ◽  
Soil Microbial ◽  
Cascading Effect ◽  
Growing Seasons ◽  
Grassland Ecosystems ◽  
Microbial Responses ◽  
Early Snowmelt

Subalpine grassland ecosystems are important from biodiversity, agriculture, and touristic perspectives but their resilience to seasonally occurring climatic extremes is increasingly challenged with climate change, accelerating their vulnerability to tipping points. Microbial communities, which are central in ecosystem functioning, are usually considered as more resistant and highly resilient to such extreme events due to their functional redundancy and strong selection in residing habitats. To investigate this, we explored the soil microbial responses upon recurrent summer droughts associated with early snowmelt in grasslands mesocosms set-up at the Lautaret Pass (French Alps). Potential respiration, nitrification and denitrification were monitored over a period of two growing seasons along with quantification of community gene abundances of total bacteria as well as (de)nitrifiers. Results revealed that droughts had a low and short-term impact on bacterial total respiration supporting their hypothesized high resistance and ability to recover. Nitrification and abundances of the corresponding functional guilds showed relatively strong resistance to summer droughts but declined in response to early snowmelt. This triggered a cascading effect on denitrification but also on the abundances of denitrifying communities which could recover from all climatic extremes except from the summer droughts where nitrifiers were collapsed. Denitrification and the respective functional groups faced high impact of applied stresses with strong reduction in the abundance and activity of this specialized community. Although, the consequently lower microbial competition for nitrate may be positive for plant biomass production, warnings exist when considering the potential nitrogen leaching from these ecosystems as well as risks of greenhouses gases emission such as N2O

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