| 刘兴宇,李广,袁建钰,徐万恒,赵萍.不同耕作措施下温度升高对旱作春小麦农田土壤N2O排放的影响[J].干旱地区农业研究,2022,40(4):177~184 |
| 不同耕作措施下温度升高对旱作春小麦农田土壤N2O排放的影响 |
| Effects of temperature rise under different tillage measures on N2O emission in dryland spring wheat farmland soil |
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| DOI：10.7606/j.issn.1000-7601.2022.04.20 |
| 中文关键词: APSIM模型 春小麦 N2O 温度升高 耕作措施 |
| 英文关键词:APSIM model spring wheat N2O temperature rise tillage measures |
| 基金项目:甘肃省重点人才项目(LRYCZ-2020-1);甘肃省重点研究发展计划（20YF8NA135）；甘肃省财政专项(GSCZZ 20160909) |
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| 中文摘要: |
| 为探究不同耕作措施下温度升高对旱作春小麦农田土壤N2O排放的影响效应，基于APSIM模型，结合甘肃省定西旱作春小麦试验区定点连续监测的N2O排放通量等数据，检验该模型模拟不同耕作措施下N2O排放的适宜性，并对不同耕作措施下日最高、最低温在0??2℃范围内耦合变化时旱作春小麦农田土壤N2O排放进行模拟。结果表明：APSIM模型对不同处理下N2O排放的模拟结果与实测结果较为一致，归一化均方根差（NRMSE）最大值为0.17，决定系数（R2）最小值为0.80，相关性均达到显著水平（P<0.05），说明该模型可以用来模拟不同耕作措施下旱作麦田N2O排放；在试验设计范围内，日最高温不变、日最低温升高会增加N2O排放，增排效果表现为传统耕作（T）>免耕（NT）>传统耕作+秸秆覆盖（TS）>免耕+秸秆覆盖（NTS），日最低温每升高0.5℃，最大增排幅度为2.41%；日最低温不变、日最高温升高会减少N2O排放，减排效果表现为T>TS>NT>NTS，日最高温每升高0.5℃，最大减排幅度为1.68%。日最低温升高带来的增排效应大于日最高温升高带来的减排效应。 |
| 英文摘要: |
| To explore the effects of temperature increase on N2O emissions in dryland spring wheat farmland soil under different tillage measures, the APSIM model, combining with datas from fixed\|point and continuous monitoring of N2O emission fluxes from the dryland spring wheat test area in Dingxi, Gansu Province was adopted in the study. The model was tested to simulate different farming practices. The suitability of N2O emission under the measures, and the simulation of N2O emission from dryland spring wheat farmland soil when the daily maximum and minimum temperature under different cultivation measures were coupled in the range of 0??2℃. The results showed that the APSIM model's simulation results of N2O emissions under different treatments were more consistent with the measured results. The minimum determination coefficient R2 was 0.80, and the maximum normalized root mean square error （NRMSE） was 0.17, indicating that the model could be used to simulate different farming. Under the measures, N2O emissions from dry farming wheat fields; within the scope of the experimental design, the daily maximum temperature remained unchanged, and the daily minimum temperature rises increased N2O emissions. The effect of increased discharge is traditional tillage (T)> non\|tillage (NT)> traditional tillage+ straw mulch (TS)> non\|tillage+straw mulch (NTS), and the maximum increase of discharge rate was 2.41% for every 0.5°C increase in the daily minimum temperature. The daily minimum temperature remained unchanged, and the daily maximum temperature rises reduced N2O emissions. The emission reduction effect was as follows: T>TS>NT>NTS. For every 0.5°C increase in the daily maximum temperature, the maximum emission reduction rate was 1.68%. The increase in emissions caused by the increase in the daily minimum temperature was greater than the emission reduction effect caused by the increase in the daily maximum temperature. |
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