|Table of Contents|

Effects of fertilization regimes on organic carbon and total nitrogen in labile and recalcitrant fractions in reclaimed soils*(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

Issue:
2020 02
Page:
1-12
Research Field:
Articles
Publishing date:

Info

Title:
Effects of fertilization regimes on organic carbon and total nitrogen in labile and recalcitrant fractions in reclaimed soils*
Author(s):
XIE Junyu12 JIAO Huan1 HONG Jianping1 ZHANG Jie1 LI Lina1 HUANG Xiaolei1 LI Li1 ZHAO Linting3 & LI Tingliang1**
1 College of Resources and Environment, Shanxi Agricultural University, Taigu 030801, China
2 Shanxi Province Key Laboratory of Soil Environment and Nutrient Resources Taiyuan 030031, China
3 College of Urban and Rural Construction, Shanxi Agricultural University, Taigu 030801, China
Keywords:
reclaimed soil fertilization regimes labile organic carbon recalcitrant organic carbon SOC critical level
CLC:
-
PACS:
DOI:
10.19675/j.cnki.1006-687x.2019.05032
DocumentCode:

Abstract:
Objectives: To deepen the understanding of the stabilization mechanism of soil organic carbon (SOC) and total nitrogen (TN), the variation characteristics of SOC and TN in labile and recalcitrant fractions in reclaimed soils along reclamation age and fertilization regimes were studied. Methods: Topsoil samples (0-20 cm) were collected from different treatments of a 4-year and an 8-year located experiment. The variation characteristics of SOC and TN in labile (I and II) and recalcitrant fractions were analyzed using sulfuric acid hydrolysis method. Five different fertilization treatments [no fertilizer (CK), chemical fertilizer with nitrogen, phosphatic and potassium (CF), organic manure alone (M), chemical fertilizer combined with manure (MCF), compound fertilizer of biological organic fertilizer and chemical fertilizer and manure (MCFB)] were set within each reclamation age. Results: The SOC and TN contents in bulk soil and each fraction all increased along reclamation age. Compared with CK, after 4 years and 8 years of reclamation, CF, M, MCF and MCFB treatments all significantly increased SOC and TN contents by 40.12%-89.97% (4 years), 34.16%-71.65% (8 years) and 22.66%-60.06%, 25.86%-37.93%, respectively, and the highest increment was in M treatment; M, MCF and MCF treatments markedly increased C and N contents in labile fraction II by 91.74%-141.22%, 60.03%-88.27% and 24.77%-51.15%, 19.73%-66.67%, respectively. Moreover, MCF and MCFB treatments markedly increased OC and TN contents in labile fraction II by 22.94%-44.62% and 41.22%-52.19% than CF after 8 years of reclamation, respectively. In addition, the threshold contents of SOC, labile fraction I and II for maximum crop yield were 9.01, 1.82 and 2.25 g/kg, respectively. Conclusions: In condition of same nutrients inputs, application of manure alone was more beneficial for the accumulation of SOC, TN and OC contents in all fractions. In addition, for the sake of scientific fertilization, the level and time of SOC input should be adjusted according to the above thresholds to achieve higher carbon sequestration efficiency.

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Last Update: 2019-07-30