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Amino acid and peptide dynamics in horticultural soils under conventional and organic management strategies

Content Provider	Springer Nature Link
Author	Ge, Tida Yuan, Hongzhao Roberts, Paula Jones, Davey L. Qin, Hongling Tong, Chengli Huang, Danfeng
Copyright Year	2011
Abstract	Free amino acids (FAAs) and peptides, and dissolved organic nitrogen (DON) comprise key pools in terrestrial soil carbon (C) and nitrogen (N) cycles. A comparative study of organic and conventional arable farming systems was conducted in Shanghai, China to determine the influence of management practices on characterization of AA and peptide dynamics.Soils from an accredited organic farm (OS), transitional farm (TS), and neighboring conventionally managed farm (CS) were sampled from agricultural areas in Shanghai, China, and the AA and peptide behavior of top soils were evaluated by $^{14}$C labeled techniques.Results showed that organic management resulted in significant increases (P < 0.05) in AA and peptide rate acquisition, possibly due to higher soil organic C (SOC) and soil respiration in OS, compared to TS and CS. The half-life of valine (Val), valine-proline-proline (Val-Pro-Pro), glutamate (Glu), and glutamate-phenylalanine (Glu-Phe) averaged across the three soils (OS, TS, and CS) was 10.6 ± 2.3, 9.4 ± 2.2, 7.1 ± 1.9, and 6.7 ± 1.5 h, respectively. The relative AA and peptide C amounts partitioned into respiration (15–32% of total) versus biomass production (68–85% of total C) was also affected by management strategy and generally followed the order CS>TS>OS; OS was significantly different from TS and CS; however, a significant difference was not detected between TS and CS. We hypothesize that AA and peptide mineralization acts as a purely biological process, as CHCl$_{3}$ fumigation and autoclaving resulted in no observable mineralization. Results showed that AA and peptide addition to soil resulted in rapid N mineralization and subsequent NO 3 − –N production, which followed a progression based on soil N mineralization rate of OS>TS>CS. AAs and peptides were only weakly sorbed onto the soil solid phase; however, our results suggested that this did not limit soil bioavailability.The results of our study indicated that soil management regimes have a substantial effect on AA and peptide behavior (mineralization, microbial uptake, and sorption, among other attributes) in horticultural production systems. Therefore, we propose that SOC and total microbial activity are likely key determinants governing AA and peptide behavior in horticultural soils.
Starting Page	323
Ending Page	333
Page Count	11
File Format	PDF
ISSN	14390108
Journal	Journal of Soils and Sediments
Volume Number	12
Issue Number	3
e-ISSN	16147480
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-12-15
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Amino acids Dissolved organic nitrogen (DON) Horticultural soils Mineralization Nitrogen cycling Organic farming Peptides Environmental Physics Environment Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Stratigraphy Earth-Surface Processes

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