中文关键词N₂O排放稻田x[CO₂]升高高应答水稻产量 英文关键词N₂O emissionsrice fieldselevated x[CO₂]the strongly responsive cultivaryield

作者	单位	E-mail
于海洋	中国科学院南京土壤研究所, 土壤与农业可持续发展国家重点实验室, 南京 210008 中国科学院大学, 北京 100049	yuhy@issas.ac.cn
黄琼	中国科学院南京土壤研究所, 土壤与农业可持续发展国家重点实验室, 南京 210008 中国科学院大学, 北京 100049
王天宇	中国科学院南京土壤研究所, 土壤与农业可持续发展国家重点实验室, 南京 210008 中国科学院大学, 北京 100049
张广斌	中国科学院南京土壤研究所, 土壤与农业可持续发展国家重点实验室, 南京 210008
马静	中国科学院南京土壤研究所, 土壤与农业可持续发展国家重点实验室, 南京 210008
朱春梧	中国科学院南京土壤研究所, 土壤与农业可持续发展国家重点实验室, 南京 210008
徐华	中国科学院南京土壤研究所, 土壤与农业可持续发展国家重点实验室, 南京 210008	hxu@issas.ac.cn

中文摘要 依托稻田大气CO₂摩尔分数（x［CO₂］）升高平台FACE （free-air CO₂ enrichment），采用静态透明箱-气相色谱法研究x［CO₂］升高（正常x［CO₂］+200 μmol·mol^-1）对高、低应答水稻（产量对x［CO₂］升高的响应分别为>30%和10%~15%）稻田N₂O排放的影响.本试验设置4个处理：A-W （正常x［CO₂］+低应答水稻）、F-W （x［CO₂］升高+低应答水稻）、A-S （正常x［CO₂］+高应答水稻）和F-S （x［CO₂］升高+高应答水稻）.结果表明，对比正常x［CO₂］处理（A-S和A-W），x［CO₂］升高条件下高、低应答水稻（F-S和F-W）稻田N₂O排放分别降低52.54%（P<0.05）和38.40%（P<0.05），水稻产量分别增加22.96%（P<0.05）和12.11%（P>0.05），稻田N₂O排放强度分别降低61.68%（P<0.05）和45.13%（P<0.05）.另外，高、低应答水稻稻田N₂O排放与稻田土壤NH₄⁺-N含量呈显著相关关系，而与NO₂^--N含量无显著相关.x［CO₂］升高条件下，土壤温度是影响高应答水稻稻田N₂O排放的重要因素.综合考虑，未来x［CO₂］升高条件下，高应答水稻品种的"增产减排"效果最佳. 英文摘要 Using the free air CO₂ enrichment (FACE) platform, an in-situ field experiment was conducted to explore the impacts of elevated CO₂ mole fraction (x[CO₂]) on N₂O emissions from strongly and weakly responsive rice cultivars. Under elevated x[CO₂], grain yield of the strongly responsive rice cultivars increased significantly, by more than 30%, whereas the weakly responsive cultivars showed a growth rate of 10%-15%. The four treatments comprised A-W (normal x[CO₂]+weakly responsive cultivar), F-W (elevated x[CO₂]+weakly responsive cultivar), A-S (normal x[CO₂]+strongly responsive cultivar), and F-S (elevated x[CO₂]+strongly responsive cultivar). Compared to the normal x[CO₂] treatments (A-S and A-W), when the strongly and weakly responsive cultivars were exposed to elevated x[CO₂](F-S and F-W), N₂O emissions decreased by 52.54% (P<0.05) and 38.40% (P<0.05), rice yield increased by 22.96% (P<0.05) and 12.11% (P>0.05), and N₂O emission intensity decreased by 61.68% (P<0.05) and 45.13% (P<0.05), respectively. Moreover, N₂O emissions of all treatments were significantly positively correlated with NH₄⁺-N content (P<0.05), whereas not correlated with NO₂^--N content. Soil temperature is an important factor affecting the N₂O emissions of the strongly responsive cultivar in rice fields under elevated x[CO₂] conditions. Through comprehensive consideration of climate conditions, in the future, priority should be given to planting the strongly responsive cultivar, ensuring high rice yield and significant reduction in N₂O emissions.

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