NDLI: Assessing chemical soil tests for predicting nitrogen mineralization in paddy soils of the Dongting Lake region in China

Content Provider	Springer Nature Link
Author	Li, Wenjun Peng, Baofa Zhao, Di Yang, Jifeng
Copyright Year	2016
Abstract	Developing routine methods that accurately predict soil nitrogen (N) mineralization is essential for fertilization recommendation; thus, chemical soil testing has received worldwide attention. However, the optimal chemical soil test for predicting soil N mineralization is region specific. This study aimed to determine suitable chemical soil tests for predicting N mineralization in paddy soils of the Dongting Lake region, China.Composite surface samples (0–20 cm) of soils (n = 30) with diverse inherent properties were collected from representative paddy fields across the region. The benchmark indices for soil N mineralization were the net mineralization rate of soil N in a 112-day anaerobic incubation under waterlogged conditions (NMRN$_{112}$) and N mineralization potential (N $_{ o }$) estimated using a modified double exponential model. Laboratory-based measurements of soil labile organic N (SLON) were conducted using chemical fractionation methods including 0.01 M NaHCO$_{3}$ extraction, hot 2 M KCl hydrolysis, phosphate-borate (PB) buffer hydrolysis, acidic KMnO$_{4}$ oxidation, and alkaline KMnO$_{4}$ oxidation. These were compared with the benchmark indices to assess their suitability for use as indicators for N mineralization.Acidic KMnO$_{4}$-oxidative organic N (acidic KMnO$_{4}$-N) and PB buffer-hydrolysable organic N (PB$_{HYDR}$-N) correlated strongly with NMRN$_{112}$ and N $_{ o }$ (r = 0.825–0.884, P < 0.001, n = 30). Grouping of soils based on soil texture generally provided no improvement in the relationships of chemical soil tests with NMRN$_{112}$ and N $_{ o }$. Multiple stepwise regression analysis indicated that combining acidic KMnO$_{4}$-N and PB$_{HYDR}$-N yielded the best prediction of soil N mineralization, explaining 86.1 and 85.5 % of the variation in NMRN$_{112}$ and N $_{ o }$, respectively, of the 30 tested paddy soils.The results of acidic KMnO$_{4}$-N and PB$_{HYDR}$-N as indicators for soil N mineralization were promising, and the operations of acidic KMnO$_{4}$ oxidation and PB buffer hydrolysis procedures are simple and cost-effective. Therefore, a combination of acidic KMnO$_{4}$-N and PB$_{HYDR}$-N shows promise in predicting N mineralization in paddy soils of the Dongting Lake region. However, further calibration through field studies is required and the chemical characteristics of acidic KMnO$_{4}$-N and PB$_{HYDR}$-N needs to be further clarified.
Starting Page	2419
Ending Page	2429
Page Count	11
File Format	PDF
ISSN	14390108
Journal	Journal of Soils and Sediments
Volume Number	16
Issue Number	10
e-ISSN	16147480
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-05-21
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Dongting Lake region Nitrogen mineralization Paddy soils Soil nitrogen testing Soil Science & Conservation Environment Environmental Physics
Content Type	Text
Resource Type	Article
Subject	Stratigraphy Earth-Surface Processes

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