Soil Organic Matter Alteration Velocity due to Land-Use Change: A Case Study under Conservation Agriculture

被引:13
作者
Rieder, Adam [1 ]
Madarasz, Balazs [2 ,3 ]
Szabo, Judit Alexandra [2 ]
Zachary, Dora [2 ]
Vancsik, Anna [2 ]
Ringer, Marianna [2 ,4 ]
Szalai, Zoltan [2 ,4 ]
Jakab, Gergely [2 ,4 ]
机构
[1] Univ Leeds, Earth Surface Sci Inst, Leeds LS2 9JT, W Yorkshire, England
[2] Hungarian Acad Sci, Res Ctr Astron & Earth Sci, Geog Inst, H-1112 Budapest, Hungary
[3] Szent Istvan Univ, Fac Hort Sci, Dept Soil Sci & Water Management, H-1118 Budapest, Hungary
[4] Eotvos Lorand Univ, Fac Sci, H-1117 Budapest, Hungary
关键词
temperate climate; carbon sequestration; conservation tillage; soil organic carbon; CARBON SEQUESTRATION; SPATIAL-DISTRIBUTION; FRACTIONS; GRASSLAND; NITROGEN; TEXTURE; SATURATION; CLIMATE; PROPERTY; DYNAMICS;
D O I
10.3390/su10040943
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The cultivation of native forest soils usually triggers a decline in soil organic matter (SOM) and a deterioration of aggregates. Although switching to conservation tillage (CT) can supply SOM, little is known about the temporal resolution of this change. This study aims to quantify changes in soil organic carbon (SOC) content and SOM composition of the same soil under 14 years of CT, plowing tillage (PT), and native forest (NF). Plowing ameliorates the macroaggregate-mediated loss in SOC content, in both the fine fraction and the coarse particles. Decades of CT can significantly increase both the microaggregates and fine particles related to SOC content, whereas in the finest fraction, the volume of recalcitrant SOC increased the most, and reached the original value under NF. Continuous plowing triggered SOM molecular size increases in both aggregates and the fine fraction, whereas switching to CT restored the molecular SOM size of the fine fraction only. Therefore, this fraction can be changed, even in short periods. Water dissolved the largest and middle-sized molecules of SOM, which are mainly from macroaggregates. Even if aggregation did not increase due to turning to CT, the content of the larger molecules of SOM increased in this short time.
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页数:11
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