15N Tracer Analysis of Nitrogen Distribution and Break-even in Paddy Soil under Water and Biochar Management

被引：0
|
作者：
Zhang Z. [1 ,2 ]
Zhang Z. [1 ,2 ]
Zheng Y. [1 ,3 ]
Li T. [1 ,3 ]
Han Y. [1 ,3 ]
Zhao W. [1 ,3 ]
机构：
[1] School of Water Conservancy and Civil Engineering, Northeast Agricultural University, Harbin
[2] College of Agriculture and Hydraulic Engineering, Suihua University, Suihua
[3] Key Laboratory of Effective Utilization of Agricultural Water Resources, Ministry of Agriculture and Rural Affairs, Northeast Agricultural University, Harbin
来源：
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | 2020年 / 51卷 / 06期
关键词：
Ammonium nitrogen; Break-even; Isotope trace technology; Nitrate nitrogen; Paddy field; Water and biochar management;
D O I：
10.6041/j.issn.1000-1298.2020.06.033
中图分类号：
学科分类号：
摘要：
In order to reveal the distribution of ammonium nitrogen and nitrate nitrogen in different soil layers and the distribution of soil nitrogen in plants under water and biochar management, the accumulation and distribution of NH4+-N and NO3--N, fertilizer NH4+-15N and NO3--15N in 0~60 cm soil layers under different water and biochar management were studied by combining field plots with 15N tracer micro-area, and the distribution of soil nitrogen in plants under different water and biochar management was calculated. The results showed that the accumulation of NH4+-N in paddy soil was decreased with the increase of soil depth under dry-shallow-wet irrigation. The accumulation of NH4+-N and NO3--N in 0~20 cm soil layer was increased by applying appropriate amount of straw biochar, while the accumulation of NH4+-N and NO3--N in 20~60 cm soil layer was reduced. The accumulations of NH4+-N, NO3--N and fertilizer NH4+-15N, NO3--15N in 0~20 cm soil layer of rice under the same straw biochar application level were higher than those of flooding irrigation. The accumulation of NO3--15N in 20~40 cm and 40~60 cm soil layers of dry-shallow-wet model was significantly lower than that of conventional flooding (P<0.05). Totally 9.79%~13.96% of the soil nitrogen accumulated in rice under dry-shallow-wet irrigation was distributed in plant leaves, 15.71%~20.03% was in plant stems and sheaths, and 66.00%~74.50% was in plant panicles. Considering the break-even of soil nitrogen pool in cold and black soil area, the best water and biochar management model was dry-shallow-wet irrigation plus 12.5 t/hm2 straw biochar. © 2020, Chinese Society of Agricultural Machinery. All right reserved.
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页码：309 / 317and395
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