Long-Term Application of Chinese Milk Vetch Return to Soil Alters Phosphorus forms Associated with Aggregates
文献类型: 外文期刊
作者: Wang, Hui;Tang, Shan;Han, Shang;Cheng, Wenlong;Bu, Rongyan;Li, Min;Ji, Wu;Cao, Weidong
作者机构:
关键词: Chinese milk vetch;Paddy soil;Soil aggregate;Phosphorus availability;Phosphorus species
期刊名称: JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION
ISSN: 0718-9508
年卷期: 2024 年
页码:
收录情况: SCIE(2024版)
摘要: Chinese milk vetch (MV) as green manure is utilized to improve rice yield and soil fertility in China. However, the long-term effects of MV on the distribution and speciation of phosphorus (P) in soil aggregates are poorly understood. We conducted a 12-year field experiment in a double-rice cropping system, with four treatments: (1) no chemical fertilizer and no MV (CK); (2) 100% of chemical fertilizer (F1); (3) 70% of chemical fertilizer (F2); and (4) 70% of chemical fertilizer and MV (F2M). We analyzed the contents and forms of P in soil aggregates, and explored the mechanisms underlying the relationships among MV, chemical fertilizer, and P forms in paddy soil. The application of MV increased the proportion of > 2 mm soil aggregates and improved the stability of soil aggregates. Compared with F2, MV applied improved the P content and storage in > 2 mm aggregates and increased the available P (AP) in all soil aggregates. Application of MV significantly increased NaHCO3-P (NaHCO3-Pi and NaHCO3-Po) and decreased residue-P (Res-P), and there was a negative correlation between Res-P and MV in all aggregates. Furthermore, MV influenced the P forms by affecting the amount of soil organic matter, total nitrogen and total P in soil aggregates. Although chemical fertilizer input more strongly affected P forms than did MV, the application of MV decreased Res-P. Therefore, co-incorporation of MV and chemical fertilizer improved the distribution of aggregates and increased the availability and supply of P in the double-rice-MV cropping system.
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