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| Titel |
Impact of the addition of different plant residues on nitrogen mineralization–immobilization turnover and carbon content of a soil incubated under laboratory conditions |
| VerfasserIn |
M. Kaleem Abbasi, M. Mahmood Tahir, N. Sabir, M. Khurshid |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 6, no. 1 ; Nr. 6, no. 1 (2015-02-13), S.197-205 |
| Datensatznummer |
250115396
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| Publikation (Nr.) |
 copernicus.org/se-6-197-2015.pdf |
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| Zusammenfassung |
| Application of plant residues as soil amendment may represent a valuable
recycling strategy that affects carbon (C) and nitrogen (N) cycling in
soil–plant systems. 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) 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,
Populus euramericana, Robinia pseudoacacia and Elaeagnus umbellata, incorporated into the soil at the rate
of 200 mg residue N kg−1 soil. The diverse plant residues showed a wide
variation in total N, C, lignin, polyphenols and C / N ratio with higher
polyphenol content in the leaves and higher lignin content in the roots. The
shoot of Glycine max and the shoot and root of Trifolium 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% recovery of N that had been released from these added
resources. The roots of Glycine max and Zea mays and the shoot of Zea mays showed continuous negative
values throughout the incubation. After an initial immobilization, leaves of
Populus euramericana, Robinia pseudoacacia and Elaeagnus umbellata 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% N recovery, respectively. 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 (lignin + 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 modifies 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. |
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