Risk Assessment of Nitrogen Runoff Loss in Single Cropping Paddy Field in the Middle and Lower Reaches of the Yangtze River Plain

WEN Xiangcheng; ZHANG Tai; DONG Shijie; YAO Yao; CHENG Keqiang; LI Xiang; WANG Fengwen; CHENG Zhiqing; MA Youhua; YANG Shuyun

doi:10.13870/j.cnki.stbcxb.2021.01.004

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Risk Assessment of Nitrogen Runoff Loss in Single Cropping Paddy Field in the Middle and Lower Reaches of the Yangtze River Plain

更新时间：2025-03-12

- Risk Assessment of Nitrogen Runoff Loss in Single Cropping Paddy Field in the Middle and Lower Reaches of the Yangtze River Plain
- Vol. 35, Issue 1, Pages: 24-35(2021)
- 作者机构：
  
  1. 安徽农业大学资源与环境学院,合肥,230036
  2. 安徽省六安市气象局,安徽,六安,237000
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2021.01.004
  CLC： X52;S511
- Published：2021
- 稿件说明：
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WEN Xiangcheng, ZHANG Tai, DONG Shijie, et al. Risk Assessment of Nitrogen Runoff Loss in Single Cropping Paddy Field in the Middle and Lower Reaches of the Yangtze River Plain[J]. 2021, 35(1): 24-35.
DOI：

WEN Xiangcheng, ZHANG Tai, DONG Shijie, et al. Risk Assessment of Nitrogen Runoff Loss in Single Cropping Paddy Field in the Middle and Lower Reaches of the Yangtze River Plain[J]. 2021, 35(1): 24-35. DOI： 10.13870/j.cnki.stbcxb.2021.01.004.

摘要

稻田氮素径流损失是农业面源污染主要来源之一，以巢湖地区单季稻田为研究对象，利用该地区1957—2019年的历史气象数据，通过设定插秧区间（6月6—25日）及施肥期水位（3，10，20 cm），建立SMNRL模型，模拟不同插秧时间和田面水水位稻田氮素流失，研究降低长江中下游平原气候区单季稻田氮素径流损失风险的插秧时间与水位控制模式。结果表明：（1）施肥后，稻田田面水氮素浓度呈指数衰减，基肥期田面水氮素衰减期为9天，分蘖肥和穗肥期为7天。（2）在LW、HW组合中，各施肥期占全生育的氮素径流损失为基肥期 > 分蘖肥期 > 穗肥期。在LW组合中，基肥期为氮素径流损失高发期，基肥、分蘖肥、穗肥的氮素流失为72.4%~98.4%，1.9%~27.6%，0~8.3%。（3）控制水位比选择插秧时间对降低氮素径流损失更有效。相同水位下，适宜的插秧期氮素径流损失在全生育期施肥中合计能减少0.4~4.5 kg/hm2，降低32.8%~80.3%；相同插秧时间下，LW、MW组合相比HW组合氮素径流损失能减少8.8~13.1 kg/hm2，降低92.1%~98.8%。（4）在LW、MW、HW 3种组合中，插秧期分别以6月19日、6月11日、6月17日为界，将6月6—25日分为前后2个阶段，前1阶段插秧产生氮素径流损失均值显著低于后1阶段，分别低37.0%，25.0%，21.7%。（5）降低巢湖地区稻田氮素径流损失有效措施为施肥期水位控制为3 cm，并选择6月6-19日期间进行水稻插秧。

Abstract

Nitrogen runoff loss from paddy fields is one of the main sources of agricultural non-point source pollution. In order to reduce the risk of nitrogen runoff loss from single-crop paddy fields in the climatic zone of the middle and lower reaches of the Yangtze River

a suitable fertilization and water level control model for this region was sought and the model of the SMNRL was built. This article used the historical meteorological data from 1957 to 2019 in the Chaohu Lake area by setting the rice transplanting interval (June 6 to 25) and the water level (3

20 cm) to simulate nitrogen loss in paddy fields. The result showed that: (1) After fertilization

the nitrogen concentration in the paddy field surface decreased exponentially. Nitrogen decay time of field water was 9 days at base fertilizer stage

and 7 days at tillering and earing fertilizer stage. (2) According to the order of nitrogen runoff loss that accounts for the whole growth in each fertilization period

in the combination of LW and HW

it was the basal fertilizer stage

the tiller fertilizer stage

and the panicle fertilizer stage. The nitrogen loss of basal fertilizer

tiller fertilizer

and panicle fertilizer was respectively 72.4% to 98.4%

1.9% to 27.6%

and 0 to 8.3% in the combination of LW

and the basal fertilizer period was the period of high nitrogen runoff loss. (3) Controlling water level was more effective than reducing planting time to reduce nitrogen runoff loss. Under the same water level

the total nitrogen runoff loss during the transplanting period were reduced by 0.4 to 4.5 kg/hm2 and 32.8% to 80.3% during the whole growth period. Under the same transplanting time

the nitrogen runoff loss of the LW and MW combinations were reduced by 8.8 to 13.1 kg/hm2 and 92.1% to 98.8% compared with the HW combination. (4) In the three combinations of LW

and HW

June 6 to 25 was divided into the early and late stages of rice transplanting

with June 19

June 11

and June 17 as the boundaries respectively. The average nitrogen runoff loss in the early stage could be reduced by 37.0%

25.0%

and 21.7% compared with the later stage. (5) The effective measures to reduce nitrogen runoff loss in rice fields in Chaohu Lake region were to control the water level during the fertilization period to 3 cm and choose a rice transplanting time between June 6th and June 19th.

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