Stable Isotope Effects of Biogas Slurry Applied as an Organic Fertilizer to Rice, Straw, and Soil
文献类型： 外文期刊
作者： Li, Chunlin 1 ; Wang, Qiang 4 ; Shao, Shengzhi 1 ; Chen, Zhaoming 4 ; Nie, Jing 1 ; Liu, Zhi 2 ; Rogers, Karyne M. 1 ; Yu 1 ;
作者机构： 1.State Key Lab Managing Biot & Chem Threats Qual &, Hangzhou 310021, Peoples R China
2.Zhejiang Acad Agr Sci, Inst Agroprod Safety & Nutr, Hangzhou 310021, Peoples R China
3.Minist Agr & Rural Affairs, Key Lab Informat Traceabil Agr Prod, Hangzhou 310021, Peoples R China
4.Zhejiang Acad Agr Sci, Inst Environm Resource & Soil Fertilizer, Hangzhou 310021, Peoples R China
5.Hunan Univ Humanities Sci & Technol, Coll Agr & Biotechnol, Loudi 417000, Peoples R China
6.GNS Sci, Natl Isotope Ctr, Lower Hutt 5040, New Zealand
关键词： rice; biogas slurry; stable isotope; 8(15)N; fractionation; organic practice
期刊名称：JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY （ 影响因子：5.279； 五年影响因子：5.269 ）
ISSN： 0021-8561
年卷期： 2021 年 69 卷 29 期
页码：
收录情况： SCI
摘要： Biogas slurry (BS) is now increasingly used for organic rice production in China. However, the isotopic response and fractionation of different BS application rates to characterize organic rice cultivation have not yet been investigated. In this study, different fertilizer treatments were applied to rice paddy soil including urea, BS with five different application rates and a control with no fertilizer added. Multiproxy analyses (% C, % N, 5'C-3, delta N-15, 5(2)H, and delta O) of rice, rice straw, and soil were undertaken using elemental analyzer-isotope ratio mass spectrometry. Rice, straw, and soil showed only minor isotopic and elemental variations across all fertilizer treatments except for (5'N. 5'N-5 values of rice and straw became more positive (+6.1 to +11.2 parts per thousand and +6.1 to +12.2 parts per thousand, respectively) with increasing BS application rates and became more negative with urea fertilization (+2.8 and +3.0%c, respectively). The soil had more positive delta N-1 values after BS application but showed no significant change with different application rates. No obvious delta N-1 isotopic differences were found between the control soil and soils fertilized with urea. N fractionation was observed between rice, straw, and soil (Delta(rice-soil) -2.0 to +4.3 parts per thousand,Delta(straw-soil)-1.9 to +5.3 parts per thousand) and their isotopic values were strongly correlated to each other (r > 0.94, p < 0.01). Results showed that % C, % N, delta C-15, 8(2)H, and 6180 in rice displayed only minor variations for different fertilizers. However, delta C-18 values increased in response to BS application, confirming that BS leaves an enriched N-15 isotopic marker in soil, straw, and rice, indicating its organically cultivated status. Results from this study will enhance the stable isotope 8'N databank for assessing organic practices using different fertilizer sources.
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