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How do different nitrogen application levels and irrigation practices impact biological nitrogen fixation and its distribution in paddy system?
Plant and Soil ( IF 3.9 ) Pub Date : 2021-08-05 , DOI: 10.1007/s11104-021-05093-7
Yanhui Zhang 1, 2 , Tianlong Hu 1, 2 , Hui Wang 1, 2 , Haiyang Jin 1, 2 , Zhibin Lin 1, 2 , Benjuan Liu 1, 2 , Hongtao Liu 1, 2 , Zhe Chen 1, 2 , Xinwu Lin 1, 2 , Xiaojie Wang 1, 2 , Jing Ma 1, 2 , Delin Sun 1, 2 , Xiaoli Sun 1, 2 , Haoye Tang 1, 2 , Qicheng Bei 1, 2 , Zubin Xie 1 , Qi Liu 3 , Francesco Cherubini 4 , Hans Peter H. Arp 5, 6
Affiliation  

Background and aims

Biological nitrogen fixation (BNF) in paddy systems is impacted by nitrogen application levels and irrigation strategies, but the extent to which these factors influence BNF and its distribution in soil and rice is largely unclear. This study investigates this influence.

Methods

An airtight, transparent growth chamber based 15N-labelling system was used to investigate how different nitrogen application levels (0, 125, 187.5 and 250 kg N ha−1) and irrigation strategies (flooding irrigation or intermittent irrigation) impact the amount of BNF and its distribution in soil and rice.

Results

Nitrogen application at 125–250 kg N ha−1 reduced the amount of BNF by 81–86%. The inhibition effect of nitrogen application on BNF at a soil depth of 1–15 cm was greater than that at 0–1 cm. Relative to the continuous flooding irrigation, intermittent irrigation enhanced rice growth and promoted the transfer of fixed nitrogen from 0-1 cm soil layer to rice, but it did not change the total amount of BNF.

Conclusions

This study indicated that BNF supplied little nitrogen for rice production at the high nitrogen application levels, but the intermittent irrigation could promote utilization of biologically fixed nitrogen.



中文翻译:

不同的施氮水平和灌溉方式如何影响生物固氮及其在水稻系统中的分布?

背景和目标

水稻系统中的生物固氮 (BNF) 受施氮水平和灌溉策略的影响,但这些因素影响 BNF 的程度及其在土壤和水稻中的分布尚不清楚。本研究调查了这种影响。

方法

使用基于15 N 标记系统的密闭透明生长室来研究不同的施氮水平(0、125、187.5 和 250 kg N ha -1)和灌溉策略(漫灌或间歇灌溉)如何影响 BNF 的量及其在土壤和水稻中的分布。

结果

以 125–250 kg N ha -1施氮可使 BNF 的量减少 81–86%。施氮对BNF的抑制作用在1-15 cm土壤深度大于0-1 cm。相对于连续漫灌,间歇灌溉促进了水稻生长,促进了0-1 cm土层固定氮向水稻的转移,但并未改变BNF的总量。

结论

本研究表明,在高施氮水平下,BNF 为水稻生产提供很少的氮,但间歇灌溉可以促进生物固定氮的利用。

更新日期:2021-08-10
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