Tillage reversal did not reverse N fertilization enhanced C storage in a Black Chernozem and a Gray Luvisol

Geoderma ◽  
2020 ◽  
Vol 370 ◽  
pp. 114355
Author(s):  
Lei Sun ◽  
Yongsheng Feng ◽  
Miles F Dyck ◽  
Dick Puurveen ◽  
Scott X. Chang
Keyword(s):  
N Fertilization ◽  
C Storage ◽  
Gray Luvisol

scholarly journals Effects of free atmospheric CO<sub>2</sub> enrichment (FACE), N fertilization and poplar genotype on the physical protection of carbon in the mineral soil of a polar plantation after five years

2006 ◽  
Vol 3 (4) ◽  
pp. 479-487 ◽  
Author(s):  
M. R. Hoosbeek ◽  
J. M. Vos ◽  
E. J. Bakker ◽  
G. E. Scarascia-Mugnozza
Keyword(s):  
Organic Matter ◽  
Net Primary Production ◽  
Mineral Soil ◽  
Co2 Enrichment ◽  
N Fertilization ◽  
Soil C ◽  
C Storage ◽  
Short Rotation ◽  
The Stability ◽  
Choice Of Species

Abstract. Free air CO2 enrichment (FACE) experiments in aggrading forests and plantations have demonstrated significant increases in net primary production (NPP) and C storage in forest vegetation. The extra C uptake may also be stored in forest floor litter and in forest soil. After five years of FACE treatment at the EuroFACE short rotation poplar plantation, the increase of total soil C% was larger under elevated than under ambient CO2. However, the fate of this additional C allocated belowground remains unclear. The stability of soil organic matter is controlled by the chemical structure of the organic matter and the formation of micro-aggregates (within macro-aggregates) in which organic matter is stabilized and protected. FACE and N-fertilization treatment did not affect the micro- and macro-aggregate weight, C or N fractions obtained by wet sieving. However, Populus euramericana increased the small macro-aggregate and free micro-aggregate weight and C fractions. The obtained macro-aggregates were broken up in order to isolate recently formed micro-aggregates within macro-aggregates (iM-micro-aggregates). FACE increased the iM-micro-aggregate weight and C fractions, although not significantly. This study reveals that FACE did not affect the formation of aggregates. We did, however, observe a trend of increased stabilization and protection of soil C in micro-aggregates formed within macro-aggregates under FACE. Moreover, the largest effect on aggregate formation was due to differences in species, i.e. poplar genotype. P. euramericana increased the formation of free micro-aggregates which means that more newly incorporated soil C was stabilized and protected. The choice of species in a plantation, or the effect of global change on species diversity, may therefore affect the stabilization and protection of C in soils.

scholarly journals Effects of elevated CO<sub>2</sub> and N fertilization on plant and soil carbon pools of managed grasslands: a meta-analysis

2012 ◽  
Vol 9 (6) ◽  
pp. 2247-2258 ◽  
Author(s):  
W. M. A. Sillen ◽  
W. I. J. Dieleman
Keyword(s):  
Nitrogen Deposition ◽  
Elevated Co2 ◽  
Root Biomass ◽  
Terrestrial Ecosystems ◽  
N Fertilization ◽  
Soil C ◽  
C Storage ◽  
Co2 Concentrations ◽  
Co2 Levels ◽  
Soil C Storage

Abstract. Elevated atmospheric CO2 levels and increasing nitrogen deposition both stimulate plant production in terrestrial ecosystems. Moreover, nitrogen deposition could alleviate an increasing nitrogen limitation experienced by plants exposed to elevated CO2 concentrations. However, an increased rate of C flux through the soil compartment as a consequence of elevated CO2 concentrations has been suggested to limit C sequestration in terrestrial ecosystems, questioning the potential for terrestrial C uptake to mitigate increasing atmospheric CO2 concentrations. Our study used data from 77 published studies applying elevated CO2 and/or N fertilization treatment to monitor carbon storage potential in grasslands, and considered the influence of management practices involving biomass removal or irrigation on the elevated CO2 effects. Our results confirmed a positive effect of elevated CO2 levels and nitrogen fertilization on plant growth, but revealed that N availability is essential for the increased C influx under elevated CO2 to propagate into belowground C pools. However, moderate nutrient additions also promoted decomposition processes in elevated CO2, reducing the potential for increased soil C storage. An important role was attributed to the CO2 response of root biomass in soil carbon responses to elevated CO2, since there was a lower potential for increases in soil C content when root biomass increased. Future elevated CO2 concentrations and increasing N deposition might thus increase C storage in plant biomass, but the potential for increased soil C storage is limited.

Influences of irrigation and N fertilization on maize (Zea mays L.) properties

2007 ◽  
Vol 35 (2) ◽  
pp. 933-936 ◽  
Author(s):  
Hrvoje Plavsic ◽  
Marko Josipovic ◽  
Luka Andric ◽  
Antun Jambrovic ◽  
Jasna Sostaric
Keyword(s):  
Zea Mays ◽  
Zea Mays L ◽  
N Fertilization

Evaluation of the N-fertilization of winter wheat based on the NMIN-method in farm practice

2006 ◽  
Vol 34 (1) ◽  
pp. 589-592 ◽  
Author(s):  
Tamás Németh ◽  
Ottó Pálmai ◽  
József Horváth
Keyword(s):  
Winter Wheat ◽  
N Fertilization

Effects of Cover Crops and Tillage on Sweet Corn Production

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 476d-476
Author(s):  
Gary R. Cline ◽  
Anthony F. Silvernail
Keyword(s):  
Cover Crops ◽  
Sweet Corn ◽  
N Fertilization ◽  
Winter Rye ◽  
No Tillage ◽  
Corn Production ◽  
Total N ◽  
No Till ◽  
Winter Cover ◽  
Winter Cover Crops

A split-plot factorial experiment examined effects of tillage and winter cover crops on sweet corn in 1997. Main plots received tillage or no tillage. Cover crops consisted of hairy vetch, winter rye, or a mix, and N treatments consisted of plus or minus N fertilization. Following watermelon not receiving inorganic N, vetch, and mix cover cropsproduced total N yields of ≈90 kg/ha that were more than four times greater than those obtained with rye. However, vetch dry weight yields (2.7 mg/ha) were only about 60% of those obtained in previous years due to winter kill. Following rye winter cover crops, addition of ammonium nitrate to corn greatly increased (P < 0.05) corn yields and foliar N concentrations compared to treatments not receiving N. Following vetch, corn yields obtained in tilled treatments without N fertilization equaled those obtained with N fertilization. However, yields obtained from unfertilized no-till treatments were significantly (P < 0.05) lower than yields of N-fertilized treatments. Available soil N was significantly (P < 0.05) greater following vetch compared to rye after corn planting. No significant effects of tillage on sweet corn plant densities or yields were detected. It was concluded that no-tillage sweet corn was successful, and N fixed by vetch was able to sustain sweet corn production in tilled treatments but not in no-till treatments.In previous years normal, higher-yielding vetch cover crops were able to sustain sweet corn in both tilled and no-till treatments.

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