Substrate type, temperature, and moisture content affect gross and net N mineralization and nitrification rates in agroforestry systems

Zaman, Mohammad; Chang, Scott X.

doi:10.1007/s00374-003-0716-0

Cited by 140 publications

(88 citation statements)

References 36 publications

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“…In addition, mineralization rates generally increase with temperature, which would enhance nutrient availability (Rustad et al 2001). However, nutrient availability may also be indirectly affected by temperature for the variation of soil moisture or the input of organic matter to soil (Cassman and Munns 1980;Zaman and Chang 2004). Therefore, prediction of the changes in N availability and plant community structure is complicated and difficult.…”

Section: Discussionmentioning

confidence: 99%

Uptake and recovery of soil nitrogen by bryophytes and vascular plants in an alpine meadow

Wang

Shi

et al. 2014

J. Mt. Sci.

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Due to their particular physiology and life history traits, bryophytes are critical in regulating biogeochemical cycles and functions in alpine ecosystem. Hence, it is crucial to investigate their nutrient utilization strategies in comparison with vascular plants and understand their responses to the variation of growing season caused by climate change. Firstly, this study testified whether or not bryophytes can absorb nitrogen (N) directly from soil through spiking three chemical forms of 15N stable isotope tracer.Secondly, with stronger ability of carbohydrates assimilation and photosynthesis, it is supposed that N utilization efficiency of vascular plants is significantly higher than that of bryophytes. However, the recovery of soil N by bryophytes can still compete with vascular plants due to their greater phytomass. Thirdly, resource acquisition may be varied from the change of growing season, during which N pulse can be manipulated with 15N tracer addition at different time. Both of bryophytes and vascular plants contain more N in a longer growing season, and prefer inorganic over organic N. Bryophytes assimilate more NH4+ than NO3-and amino acid, which can be indicated from the greater shoot excess 15N of bryophytes. However, vascular plants prefer to absorb NO3-for their developed root systems and vascular tissue. Concerning the uptake of three forms N by bryophytes, there is significant difference between two manipulated lengths of growing season. Furthermore, the capacity of bryophytes to tolerate N-pollution may be lower than currently appreciated, which indicates the effect of climate change on asynchronous variation of soil N pools with plant requirements.

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Section: Discussionmentioning

confidence: 99%

Uptake and recovery of soil nitrogen by bryophytes and vascular plants in an alpine meadow

Wang

Shi

et al. 2014

J. Mt. Sci.

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“…Production of N 2 O via heterotrophic nitrification is poorly understood because autotrophic and heterotrophic nitrification can occur simultaneously in a given soil and it is difficult to separate the end products of these two processes without using 15 N tracers (Matheson et al, 2003). Sufficient soil O 2 levels [(optimum at water filled pore space (WFPS) of 60%)], adequate NH 4 + concentrations, a favorable soil temperature above 5 o C (optimum 25 to 35 o C), and soil pH above 5 (optimum 7 to 9) are among the known soil and environmental conditions which control the rate of autotrophic nitrification (Linn & Doran 1984;Grundmann et al, 1995;Whitehead, 1995;Zaman et al, 1999a;Šimek., 2000;Zaman & Chang, 2004;Zaman et al, 2007;Saggar et al, 2009;Zaman et al, 2009;Zaman & Nguyen, 2010). Among these factors, NH 4 + and O 2 concentrations are considered the most critical factors affecting autotrophic nitrification (Zaman et al, 2007).…”

Section: Nitrificationmentioning

confidence: 99%

“…Among these factors, NH 4 + and O 2 concentrations are considered the most critical factors affecting autotrophic nitrification (Zaman et al, 2007). Thus autotrophic nitrification is expected to be a dominant N transformation process in well-drained pastoral or arable systems, where soils are oxygenated (at or around field capacity or at 60% WFPS) and NH 4 + is abundant [(e.g., excreta deposition after animal grazing, after the application of organic wastes, and NH 4 + -based synthetic fertilizer like urea, di-ammonium phosphate (DAP), ammonium sulphate, and liquid ammonia or as a result of increased mineralization of soil organic N compounds)] (Zaman et al, 1999a,b;Zaman & Chang, 2004;Zaman et al, 2007;2008a;Zaman & Nguyen 2010). However, nitrification can also occur in waterlogged areas at a slower rate where wetland vegetation releases O 2 from roots (Armstrong, 1964).…”

Section: Nitrificationmentioning

confidence: 99%

Emissions of Nitrous Oxide (N2O) and Di-Nitrogen (N2) from the Agricultural Landscapes, Sources, Sinks, and Factors Affecting N2O and N2 Ratios

Zaman¹,

Nguyen²,

Šimek³

et al. 2012

Greenhouse Gases - Emission, Measurement and Management

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“…[29,31,46]. In this study, significant correlations of soil microbial respiration with soil temperature and soil moisture at the temporal and spatial scales (Table 2) indicate that these two factors control soil microbial growth, activity, and respiration [47]. Soil temperature and soil moisture could explain 74-92% and 61-84% of the variation in soil respiration.…”

Section: Effect Of Slope Position On Soil Respirationmentioning

confidence: 61%

Effect of No-Till Farming and Straw Mulch on Spatial Variability of Soil Respiration in Sloping Cropland

Li¹,

Hou²,

Wang³

et al. 2016

Pol. J. Environ. Stud.

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The two major techniques of conservation agriculture -no-till and straw mulch -are widely used in agricultural activities. Many studies have investigated the response of soil respiration to conservation agriculture. However, there are few studies estimating soil CO 2 emissions in sloping cropland. For this research we selected typical sloping cropland in China's semiarid Loess Plateau region. The spatial heterogeneity of soil respiration under different tillage and straw mulch was investigated using an LI-8100A soil carbon flux measuring system from October 2013 to September 2014. Soil respiration showed a strong seasonal pattern under all treatments, with the highest values in July ). No-till increased soil respiration by increasing soil temperature and soil moisture, while straw mulch decreased soil moisture and had the tendency to increase annual total carbon emissions, and straw incorporation had the highest annual total soil carbon emissions (992 g C m -2 ). The slope stage had a visible effect on soil respiration, and soil respiration rates increased in the following order: lower > middle > upper positions under different treatments. The relationship between soil respiration and soil moisture was linear under all treatments; the exponential model was more suitable for simulating the relationship between soil respiration and soil temperature. Temperature sensitivity (Q 10 ) values under different treatments ranged from 1.94 to 2.63, and the difference among tillage and straw mulch treatments as a whole was not significant. However, the Q 10 values had a tendency to decrease from summit to foot in tillage treatments, and no-tillage would reduce spatial variability of Q 10 values.

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Substrate type, temperature, and moisture content affect gross and net N mineralization and nitrification rates in agroforestry systems

Cited by 140 publications

References 36 publications

Uptake and recovery of soil nitrogen by bryophytes and vascular plants in an alpine meadow

Uptake and recovery of soil nitrogen by bryophytes and vascular plants in an alpine meadow

Emissions of Nitrous Oxide (N2O) and Di-Nitrogen (N2) from the Agricultural Landscapes, Sources, Sinks, and Factors Affecting N2O and N2 Ratios

Effect of No-Till Farming and Straw Mulch on Spatial Variability of Soil Respiration in Sloping Cropland

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