scholarly journals Nitrogen Mineralization, Soil Microbial Biomass and Extracellular Enzyme Activities Regulated by Long-Term N Fertilizer Inputs: A Comparison Study from Upland and Paddy Soils in a Red Soil Region of China

Agronomy ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2057
Author(s):  
Sehrish Ali ◽  
Kailou Liu ◽  
Waqas Ahmed ◽  
Huang Jing ◽  
Muhammad Qaswar ◽  
...  
Keyword(s):  
Microbial Biomass ◽  
Paddy Soil ◽  
Enzyme Activities ◽  
Soil Microbial Biomass ◽  
Inorganic Nitrogen ◽  
N Addition ◽  
Upland Soil ◽  
Total N ◽  
Soil Microbial

A long-term experiment (38 years) was conducted to elucidate the effects of long-term N addition on the net N mineralization in both paddy and upland soils, based on their initial soil N status, with and in connection with soil microbial biomass and N cycling extracellular enzyme activities. Two treatments without N addition CK (No fertilizer) and K (inorganic potassium fertilizer) and two treatments with N addition N (inorganic nitrogen fertilizer) and NK (inorganic nitrogen and potassium fertilizer) were placed in incubation for 90 days. Results showed that the total N and soil organic carbon (SOC) contents were higher in the treatments with N application compared to the treatments without N in both paddy and upland soils. The SOC content of paddy soil was increased relative to upland soil by 56.2%, 45.7%, 61.1% and 62.2% without N (CK, K) and with N (N and NK) treatments, respectively. Site-wise, total N concentration in paddy soil was higher by 0.06, 0.10, 0.57 and 0.60 times under the CK, K, N and NK treatments, respectively, compared with upland soil. In paddy soil, soil microbial biomass nitrogen (SMBN) was higher by 39.6%, 2.77%, 29.5% and 31.4%, and microbial biomass carbon (SMBC) was higher by 11.8%, 11.9%, 10.1% and 12.3%, respectively, in CK, K, N and NK treatment, compared with upland soil. Overall, compared to upland soil, the activities of leucine-aminopeptidase (LAP) were increased by 31%, 18%, 20% and 11%, and those of N-acetyl-b-D-glucosaminidase (NAG) were increased by 70%, 21%, 13% and 18% by CK, K, N and NK treatments, respectively, in paddy soil. A significantly linear increase was found in the NO3−-N and NH4+-N concentrations during the 90 days of the incubation period in both soils. NK treatment showed the highest N mineralization potential (No) along with mineralization rate constant, k (NMR) at the end of the incubation. SMBC, SMBN, enzyme activities, NO3−-N and NH4+-N concentrations and the No showed a highly significant (p ≤ 0.05) positive correlation. We concluded that long-term N addition accelerated the net mineralization by increasing soil microbial activities under both soils.

scholarly journals Warming and Nitrogen Addition Change the Soil and Soil Microbial Biomass C:N:P Stoichiometry of a Meadow Steppe

2019 ◽  
Vol 16 (15) ◽  
pp. 2705
Author(s):  
Gong ◽  
Zhang ◽  
Guo
Keyword(s):  
Microbial Biomass ◽  
Soil Microbial Biomass ◽  
Field Experiments ◽  
Microbial Biomass C ◽  
Nutrient Ratios ◽  
Microbial Biomass N ◽  
N Addition ◽  
Total N ◽  
C:N:P Stoichiometry ◽  
Soil Microbial

: Soil and soil microbial biomass (SMB) carbon: nitrogen: phosphorus (C:N:P) stoichiometry are important parameters to determine soil balance of nutrients and circulation of materials, but how soil and SMB C:N:P stoichiometry is affected by climate change remains unclear. Field experiments with warming and N addition had been implemented since April 2007. Infrared radiators were used to manipulate temperature, and aqueous ammonium nitrate (10 g m-2 yr-1) was added to simulate nitrogen deposition. We found that molar nutrient ratios in the soil averaged 60:11:1, warming and warming plus N addition reduced soil C:N by 14.1% and 20% (P < 0.01), and reduced soil C:P ratios by 14.5% and 14.8% (P < 0.01). N addition reduced soil C:N significantly by 17.6% (P < 0.001) (Figs. 2B, 2D). N addition and warming plus N addition increased soil N:P significantly by 24.6% and 7.7% (P < 0.01). The SMB C:N, C:P and N:P ratios increased significantly with warming, N addition and warming plus N addition. Warming and N addition increased the correlations between SOC and soil microbial biomass C (SMBC), soil total P and soil microbial biomass P (SMBP), warming increased the correlation between the soil total N and soil microbial biomass N (SMBN). After four years’ treatment, our results demonstrated that the combined effects of warming and N fertilization could change the C, N, P cycling by affecting soil and SMB C:N:P ratios significantly and differently. At the same time, our results suggested SMB might have weak homeostasis in Sonnen Grassland and warming and N addition would ease N-limitation but aggravate P-limitation in northeastern China. Furthermore, these results further the current demonstration of the relationships between the soil and SMB C:N:P stoichiometry in response to global change in temperate grassland ecosystems.

Effects of long-term fertilization on soil microbial biomass carbon and nitrogen and enzyme activities during maize growing season

2012 ◽  
Vol 32 (17) ◽  
pp. 5502-5511 ◽  
Author(s):  
马晓霞 MA Xiaoxia ◽  
王莲莲 WANG Lianlian ◽  
黎青慧 LI Qinghui ◽  
李花 LI Hua ◽  
张树兰 ZHANG Shulan ◽  
...  
Keyword(s):  
Microbial Biomass ◽  
Enzyme Activities ◽  
Soil Microbial Biomass ◽  
Microbial Biomass Carbon ◽  
Growing Season ◽  
Biomass Carbon ◽  
Carbon And Nitrogen ◽  
Soil Microbial ◽  
Soil Microbial Biomass Carbon

Linking soil microbial biomass and enzyme activities to long-term manure applications and their nonlinear legacy

Pedobiologia ◽  
2019 ◽  
Vol 74 ◽  
pp. 34-42 ◽  
Author(s):  
Newton Z. Lupwayi ◽  
Yuting Zhang ◽  
Xiying Hao ◽  
Ben W. Thomas ◽  
Andrea H. Eastman ◽  
...  
Keyword(s):  
Microbial Biomass ◽  
Enzyme Activities ◽  
Soil Microbial Biomass ◽  
Soil Microbial

SOIL MICROBIAL BIOMASS AND ENZYME ACTIVITIES RESPONSE TO COPPER AND MOLYBDENUM POLLUTION IN THE VICINITY OF ZANGEZUR COPPER AND MOLYBDENUM COMBINE, ARMENIA

2020 ◽  
Vol 54 (3 (253)) ◽  
pp. 235-245
Author(s):  
K.A. Ghazaryan ◽  
H.S. Movsesyan
Keyword(s):  
Microbial Biomass ◽  
Enzymatic Activity ◽  
Enzyme Activities ◽  
Soil Microbial Biomass ◽  
Negative Impact ◽  
Chemical Elements ◽  
Extracellular Enzyme ◽  
Soil Biological Activity ◽  
Soil Enzymatic Activity ◽  
Soil Microbial

The aim of this study was to define a relationship between heavy metal (Cu, Mo) pollution of soil and various extracellular enzyme activities. Six enzymatic activities involved in cycles of carbon, nitrogen, phosphorus and sulfur (β-glucosidase, chitinase, leucine-aminopeptidase, acid phosphomonoesterase, alkaline phosphomonoesterase, and arylsulphatase) as well as microbial biomass were determined in soil samples collected in the surroundings of Zangezur Copper and Molybdenum Combine. The investigations showed that pollution of soil with copper and molybdenum led to a decrease in microbial biomass and soil enzymatic activity, which in turn had a negative impact on cycles of chemical elements, in particular C, P, N and S. This gives reason to conclude that the changes in soil microbial biomass and enzymatic activity may act as indicators of soil biological activity and quality.

scholarly journals Age and Species of Eucalyptus Plantations Affect Soil Microbial Biomass and Enzymatic Activities

2020 ◽  
Vol 8 (6) ◽  
pp. 811 ◽  
Author(s):  
Jie Xu ◽  
Bing Liu ◽  
Zhao-lei Qu ◽  
Yang Ma ◽  
Hui Sun
Keyword(s):  
Microbial Biomass ◽  
Enzyme Activities ◽  
Fungal Biomass ◽  
Soil Microbial Biomass ◽  
Extracellular Enzymes ◽  
Eucalyptus Species ◽  
Eucalyptus Plantation ◽  
Soil Microbial ◽  
Eucalyptus Plantations ◽  
Plantation Age

Soil microorganisms and extracellular enzymes play important roles in soil nutrient cycling. Currently, China has the second-largest area of eucalyptus plantations in the world. Information on the effects of eucalyptus age and species of trees on soil microbial biomass and enzyme activities, however, is limited. In this paper, the soil microbial biomass and enzyme activities were studied in eucalyptus plantations with different ages (1 and 5+ years) and species of trees (E. urophylla×E. grandis, E. camaldulens and E. pellita) in South China. The results showed that both plantation age and eucalyptus species could affect the total microbial biomass and fungal biomass, whereas the bacterial biomass was affected only by plantation age. The fungal biomass and the fungi-to-bacteria ratio significantly increased along with increasing plantation age. Similarly, the plantation age and eucalyptus species significantly affected the enzyme activities associated with carbon cycling (β-xylosidase, β-d-glucuronidase, β-cellobiosidase and β-glucosidase). The activities of β-d-glucuronidase and β-glucosidase were significantly higher in the E. camaldulens plantation. The enzymes involved in nitrogen (N-acetyl-glucosamidase) and sulfur (sulfatase) cycling were only affected by the eucalyptus plantation age and species, respectively. The results highlight the importance of the age and species of eucalyptus plantations on soil microbial activities.

LONG-TERM LAND USE INFLUENCES SOIL MICROBIAL BIOMASS P AND S, PHOSPHATASE AND ARYLSULFATASE ACTIVITIES, AND S MINERALIZATION IN A BRAZILIAN OXISOL

2013 ◽  
Vol 25 (4) ◽  
pp. 397-406 ◽  
Author(s):  
Elcio L. Balota ◽  
Ines F. Yada ◽  
Higo Amaral ◽  
Andre S. Nakatani ◽  
Richard P. Dick ◽  
...  
Keyword(s):  
Land Use ◽  
Microbial Biomass ◽  
Soil Microbial Biomass ◽  
Soil Microbial ◽  
S Mineralization ◽  
Microbial Biomass P
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