Soil nitrogen mineralization and enzymatic activities in fire and fire surrogate treatments in California

2011 ◽  
Vol 91 (6) ◽  
pp. 935-946 ◽  
Author(s):  
J. R. Miesel ◽  
R. E. J. Boerner ◽  
C. N. Skinner
Keyword(s):  
Nitrogen Mineralization ◽  
Soil Nitrogen ◽  
Prescribed Fire ◽  
N Mineralization ◽  
Large Scale ◽  
Enzymatic Activities ◽  
N Transformations ◽  
Soil Nitrogen Mineralization ◽  
In Fire ◽  
Nms Ordination

Miesel, J. R., Boerner, R. E. J. and Skinner, C. N. 2011. Soil nitrogen mineralization and enzymatic activities in fire and fire surrogate treatments in California. Can. J. Soil Sci. 91: 935–946. Forest thinning and prescribed fire are management strategies used to reduce hazardous fuel loads and catastrophic wildfires in western mixed-conifer forests. We evaluated effects of thinning (Thin) and prescribed fire (Burn), alone and in combination (Thin+Burn), on N transformations and microbial enzyme activities relative to an untreated control (Control) at 1 and 3 yr following treatment in northern California. N mineralization and net nitrification were reduced by Thin and by Burn in year 1, and N mineralization was increased by Thin+Burn in year 3, relative to the Control. In general, all experimental treatments reduced soil enzyme activity. To identify overall treatment effects on the below-ground ecosystem, we combined these data with soil physicochemical data from this site to perform non-metric multidimensional scaling (NMS) ordination. NMS ordination showed that Burn and Thin+Burn produced the greatest overall effects on soil, and that overall differences in soil characteristics among treatments diminish over time. These results provide an important benchmark for monitoring ecosystem effects of large-scale wildfire hazard reduction strategies over the long term.

Ant-mediated effects on soil nitrogen mineralization vary with species in a tropical forest

CATENA ◽  
2021 ◽  
Vol 203 ◽  
pp. 105352
Author(s):  
Qianqian Zuo ◽  
Shaojun Wang ◽  
Ping Wang ◽  
Qianbin Cao ◽  
Shuang Zhao ◽  
...  
Keyword(s):  
Tropical Forest ◽  
Nitrogen Mineralization ◽  
Soil Nitrogen ◽  
Soil Nitrogen Mineralization ◽  
Mediated Effects

scholarly journals Impact of the addition of different plant residues on carbon–nitrogen content and nitrogen mineralization–immobilization turnover in a soil incubated under laboratory conditions

2014 ◽  
Vol 6 (2) ◽  
pp. 3051-3074 ◽  
Author(s):  
M. K. Abbasi ◽  
M. M. Tahir ◽  
N. Sabir ◽  
M. Khurshid
Keyword(s):  
Nitrogen Mineralization ◽  
Biochemical Composition ◽  
N Mineralization ◽  
Growth Promotion ◽  
Lignin Content ◽  
Leguminous Plant ◽  
Plant Residues ◽  
Net N Mineralization ◽  
N Transformations ◽  
Total N

Abstract. Application of plant residues as soil amendment may represent a valuable recycling strategy that affects on carbon (C) and nitrogen (N) cycling, soil properties improvement and plant growth promotion. The amount and rate of nutrient release from plant residues depend on their quality characteristics and biochemical composition. A laboratory incubation experiment was conducted for 120 days under controlled conditions (25 °C and 58% water filled pore space (WFPS)) to quantify initial biochemical composition and N mineralization of leguminous and non-leguminous plant residues i.e. the roots, shoots and leaves of Glycine max, Trifolium repens, Zea mays, Poplus euramericana, Rubinia pseudoacacia and Elagnus umbellate incorporated into the soil at the rate of 200 mg residue N kg−1 soil. The diverse plant residues showed wide variation in total N, carbon, lignin, polyphenols and C/N ratio with higher polyphenol content in the leaves and higher lignin content in the roots. The shoot of G. max and the shoot and root of T. repens displayed continuous mineralization by releasing a maximum of 109.8, 74.8 and 72.5 mg N kg−1 and representing a 55, 37 and 36% of added N being released from these resources. The roots of G. max and Z. mays and the shoot of Z. mays showed continuous negative values throughout the incubation showing net immobilization. After an initial immobilization, leaves of P. euramericana, R. pseudoacacia and E. umbellate exhibited net mineralization by releasing a maximum of 31.8, 63.1 and 65.1 mg N kg−1, respectively and representing a 16, 32 and 33% of added N being released. Nitrogen mineralization from all the treatments was positively correlated with the initial residue N contents (r = 0.89; p ≤ 0.01), and negatively correlated with lignin content (r = −0.84; p ≤ 0.01), C/N ratio (r = −0.69; p ≤ 0.05), lignin/N ratio (r = −0.68; p ≤ 0.05), polyphenol/N ratio (r = −0.73; p ≤ 0.05) and ligin + polyphenol/N ratio (r = −0.70; p ≤ 0.05) indicating a significant role of residue chemical composition and quality in regulating N transformations and cycling in soil. The present study indicates that incorporation of plant residues strongly modify the mineralization-immobilization turnover (MIT) of soil that can be taken into account to develop synchronization between net N mineralization and crop demand in order to maximize N delivery and minimize N losses.

Hardwood mixtures facilitate leaf litter decomposition and soil nitrogen mineralization in conifer plantations

2022 ◽  
Vol 507 ◽  
pp. 120006
Author(s):  
Chie Masuda ◽  
Hitoshi Kanno ◽  
Kazuhiko Masaka ◽  
Yumena Morikawa ◽  
Masanori Suzuki ◽  
...  
Keyword(s):  
Leaf Litter ◽  
Litter Decomposition ◽  
Nitrogen Mineralization ◽  
Soil Nitrogen ◽  
Leaf Litter Decomposition ◽  
Soil Nitrogen Mineralization ◽  
Conifer Plantations
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