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 Water extractable organic carbon and nitrogen and their natural stable isotopes from long-term experiment in a Japanese rice paddy. Journal of Wetlands Environmental Management.
Tác giả hoặc Nhóm tác giả: Toan Nguyen-Sy, Weiguo Cheng, Julien Guigue, Samuel Munyaka Kimani, Wisnu Aji Wibowo, Keitaro Tawaraya, Toru Watanabe, Ji Wu and Xingkai Xu
Nơi đăng: JOURNAL OF WETLANDS ENVIRONMENTAL MANAGEMENT; Số: 2;Từ->đến trang: 60-73;Năm: 2018
Lĩnh vực: Nông lâm ngư; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
Hot water- and water-extracted organic matter was extracted from soil samples collected after a 31-year long-term experiment which is carrying out in Yamagata, northeastern Japan for single rice cultivation. The ratio of soil to extracted water was 2:3, lower than normal (1:5~1:10) for δ 13C and δ15N measurements. The amounts of hot waterextracted organic carbon and nitrogen (HWEOC and HWEN) at 80oC and 16 hours, water-extracted organic carbon and nitrogen (WEOC and WEN) at room temperature, and their δ13C and δ15N were measured from the five fertilizer treatment plots as [1) PK, 2) NPK, 3) NPK + 6 Mg ha-1 rice straw (RS), 4) NPK + 10 Mg ha-1 rice straw compost (CM1), and 5) NPK + 30 Mg ha-1 rice straw compost (CM3)], for surface (0-15 cm) and subsurface (15- 25 cm) layers. HWEOC and WEOC accounted for an average of about 1.51 and 0.66% of SOC, while HWEN and WEN accounted for an average of about 1.09 and 0.40% of soil TN, respectively. About 90% of the extracted N was organic form among all treatments. The δ 13C values of HWEOC and WEOC ranged from -28.2 to -26.5‰ and from -28.3 to -27.0‰, similar to the original rice straw and rice straw compost, and lower than the value of original soil at -22.5‰. The δ15N values of HWEN, WEN and bulk soil ranged from 0.8 to 3.8‰, from 1.0 to 4.0‰, and from 0.8 to 2.8‰, respectively. It was clear that δ15N decreased in RS but increased in CM3 treatments. Our results indicated that the amounts of hot water- and water-extracted organic matter were affected by long-term application of inorganic fertilizers and organic matters remarkably. However, the δ 13C values of HWEOC and WEOC were not different among 5 treatments, but δ 15N values of HWEN and WEN were clearly affected by RS and CM3 applications.
ABSTRACT
Hot water- and water-extracted organic matter was extracted from soil samples collected after a 31-year long-term experiment which is carrying out in Yamagata, northeastern Japan for single rice cultivation. The ratio of soil to extracted water was 2:3, lower than normal (1:5~1:10) for δ 13C and δ15N measurements. The amounts of hot waterextracted organic carbon and nitrogen (HWEOC and HWEN) at 80oC and 16 hours, water-extracted organic carbon and nitrogen (WEOC and WEN) at room temperature, and their δ13C and δ15N were measured from the five fertilizer treatment plots as [1) PK, 2) NPK, 3) NPK + 6 Mg ha-1 rice straw (RS), 4) NPK + 10 Mg ha-1 rice straw compost (CM1), and 5) NPK + 30 Mg ha-1 rice straw compost (CM3)], for surface (0-15 cm) and subsurface (15- 25 cm) layers. HWEOC and WEOC accounted for an average of about 1.51 and 0.66% of SOC, while HWEN and WEN accounted for an average of about 1.09 and 0.40% of soil TN, respectively. About 90% of the extracted N was organic form among all treatments. The δ 13C values of HWEOC and WEOC ranged from -28.2 to -26.5‰ and from -28.3 to -27.0‰, similar to the original rice straw and rice straw compost, and lower than the value of original soil at -22.5‰. The δ15N values of HWEN, WEN and bulk soil ranged from 0.8 to 3.8‰, from 1.0 to 4.0‰, and from 0.8 to 2.8‰, respectively. It was clear that δ15N decreased in RS but increased in CM3 treatments. Our results indicated that the amounts of hot water- and water-extracted organic matter were affected by long-term application of inorganic fertilizers and organic matters remarkably. However, the δ 13C values of HWEOC and WEOC were not different among 5 treatments, but δ 15N values of HWEN and WEN were clearly affected by RS and CM3 applications.
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