| 毛梦凡,高利正,龙永,徐影,李彦生,金剑,于镇华.大气CO2浓度和温度升高对黑土禾谷类作物根际土壤有机氮组分的影响[J].农业环境科学学报,2025,44(4):890-898. |
| 大气CO2浓度和温度升高对黑土禾谷类作物根际土壤有机氮组分的影响 |
| The impact of elevated atmospheric CO2 concentrations and temperatures on the organic nitrogen composition in the rhizosphere soil of cereals in Mollisol |
| 投稿时间：2024-03-19 |
| DOI：10.11654/jaes.2024-0240 |
| 中文关键词: 气候变化 酸解有机氮 氮矿化 禾本科作物 |
| 英文关键词: climate change organic nitrogen fractions nitrogen mineralization gramineous crops |
| 基金项目:国家自然科学基金项目（42177435）；国际大科学计划培育专项项目（131323KYSB20210004） |
| 作者 | 单位 | E-mail | | 毛梦凡 | 中国科学院东北地理与农业生态研究所, 黑土区农业生态重点实验室, 哈尔滨 150081
中国科学院大学, 北京 100049 | | | 高利正 | 中国科学院东北地理与农业生态研究所, 黑土区农业生态重点实验室, 哈尔滨 150081
中国科学院大学, 北京 100049 | | | 龙永 | 中国科学院东北地理与农业生态研究所, 黑土区农业生态重点实验室, 哈尔滨 150081
中国科学院大学, 北京 100049 | | | 徐影 | 中国科学院东北地理与农业生态研究所, 黑土区农业生态重点实验室, 哈尔滨 150081
中国科学院大学, 北京 100049 | | | 李彦生 | 中国科学院东北地理与农业生态研究所, 黑土区农业生态重点实验室, 哈尔滨 150081 | | | 金剑 | 中国科学院东北地理与农业生态研究所, 黑土区农业生态重点实验室, 哈尔滨 150081 | | | 于镇华 | 中国科学院东北地理与农业生态研究所, 黑土区农业生态重点实验室, 哈尔滨 150081 | yuzhenhua@iga.ac.cn |
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| 中文摘要: |
| 为阐述大气CO2浓度和温度升高对黑土区主要禾谷类作物土壤有机氮组分含量的变化及其对土壤氮素有效性的潜在影响，本实验通过使用开顶式气候室（OTC）模拟大气CO2浓度升高（550 μmol·mol-1）和温度升高（+2 ℃），以正常大气CO2浓度和温度作为对照，对黑土区3种主要禾谷类作物根际土壤的有机氮组分进行了测定，并与土壤理化性质进行了相关性分析。结果显示：小麦根际土壤酸解总氮和各组分受大气CO2浓度和温度升高的影响大于玉米和水稻。具体表现在：小麦根际土壤的酸解氮和各组分均不同程度地受到大气CO2浓度和温度升高，以及两者共同升高的影响。水稻根际只有酸解氮以及未知态氮受到两者共同升高作用显著影响，而玉米根际的酸解氮和各组分则没有受到大气CO2浓度和温度单独升高或两者共同升高的影响。同时，与对照处理相比，在大气CO2浓度和温度共同升高的作用下，不同作物的有机氮各组分占全氮的比例也会发生变化，3种作物土壤中氨基酸态氮和氨态氮仍然为酸解氮组分的主要贡献者，未知态氮次之，氨基糖态氮含量最低。相关分析表明，酸解有机氮组分受全氮和速效磷影响显著。研究表明，在未来大气CO2浓度和温度升高条件下，应适度减少小麦氮肥的施加量，增加水稻和玉米氮肥的施用量以及适当调节土壤理化性质，以提高氮素的有效性。 |
| 英文摘要: |
| To elucidate the potential impacts of increased atmospheric CO2 concentration and temperature rise on the changes in soil organic nitrogen components of major cereal crops in Mollisol, this study employed open-top chambers（OTCs）to simulate elevated atmospheric CO2 concentration（550 μmol·mol-1）and temperature（+2 ℃）. Normal atmospheric CO2 concentration and temperature were used as controls. Soil samples from the rhizosphere of different crops were analyzed for acid hydrolyzable organic nitrogen components, and their correlation with soil physicochemical properties was investigated. The results revealed that the influence of elevated atmospheric CO2 concentration and temperature on acid hydrolyzable total nitrogen and its components in wheat rhizosphere was greater than that in maize and rice. Specifically, in wheat rhizosphere soil, both total nitrogen and its components were affected to varying degrees by elevated atmospheric CO2 concentration and temperature, as well as their interaction. In rice rhizosphere, total nitrogen and unidentified nitrogen was affected by the interaction between the two factors, while in maize rhizosphere, neither total nitrogen nor its components were affected by either the increase in CO2 concentration or temperature alone, or their interaction. Furthermore, compared to the control, under the interactive effect of CO2 concentration and temperature increase, the proportions of different organic nitrogen components to total nitrogen varied among different crops. In the soils of three types of crops, amino acid nitrogen and ammonium nitrogen remain the primary contributors to acid hydrolysable nitrogen components, followed by unknown nitrogen, with amino sugar nitrogen content being the lowest. Correlation analyses showed that acid hydrolysable nitrogen compontents are significantly affected by total nitrogen and available phosphorus. The results of the study indicated that under future conditions of elevated atmospheric CO2 concentration and temperature, the application of N fertiliser for wheat should be moderately reduced, the use of N fertiliser for rice and maize should be increased, and the soil physicochemical properties should be adjusted to improve the soil nitrogen effectiveness. |
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