Effects of Different Nitrogen Application Rates on Photosynthetic Characteristics and Yield of Alfalfa in Horqin Sandy Land

doi:10.11733/j.issn.1007-0435.2024.12.033

Acta Agrestia Sinica ›› 2024, Vol. 32 ›› Issue (12): 3973-3979.DOI: 10.11733/j.issn.1007-0435.2024.12.033

Effects of Different Nitrogen Application Rates on Photosynthetic Characteristics and Yield of Alfalfa in Horqin Sandy Land

LIU Ze-yu¹, SUI Ke¹, SHAN Xin-he², GAO Qi-fan¹, ZHANG Yu-xia¹, ZHANG Yun-long², SUN Tie-nan¹, WANG Xian-guo²

1. Key Laboratory of Ecological Agriculture in Horqin Sandy Land, College of Prataculture, Inner Mongolia Minzu University/State Ethnic Affairs Commission, Tongliao, Inner Mongolia 028000, China;
2. College of Pratacultural Science and Technology, China Agricultural University, Beijing 100193, China

Received:2024-04-01 Revised:2024-05-02 Published:2024-12-14

不同施氮量对科尔沁沙地紫花苜蓿光合特性及产量的影响

刘泽宇¹, 隋可¹, 单新河², 高启凡¹, 张玉霞¹, 张运龙², 孙铁男¹, 王显国²

1. 内蒙古民族大学草业学院/国家民委科尔沁沙地生态农业重点实验室, 内蒙古通辽 028000;
2. 中国农业大学草业科学与技术学院, 北京 100193

通讯作者: 张玉霞,E-mail:yuxiazhang685@163.com
作者简介:刘泽宇(1998-),男,汉族,内蒙古包头人,硕士研究生,主要从事饲草种质资源与利用研究,E-mail:lzy13171242444@163.com;
基金资助:
国家牧草产业技术体系(CARS-34);内蒙古自治区直属高校科研专项(GXKY22018);国家民委科尔沁沙地生态农业重点实验室开放基金项目(MDK2023095);国家级大学生创新创业训练计划项目(202410136013)资助

Abstract

Abstract: In order to reveal the effects of reduced nitrogen fertilization on the photosynthetic characteristics and yield of alfalfa (Medicago sativa L.) in Horqin Sand Land, the present study was conducted to investigate the response of alfalfa photosynthetic characteristics and growth characteristics to nitrogen fertilization with four nitrogen application treatments, namely, N₀ (0 kg·hm^-2), N₁ (37.5 kg·hm^-2), N₂ (52.5 kg·hm^-2) and N₃ (75 kg·hm^-2).'Knight T’ sas used as the material to study the response of alfalfa photosynthetic characteristics, yield and growth characteristics to the application of nitrogen fertilizer. The results showed that:(1) The N₂ treatment had the highest net photosynthetic rate (Pn) and the lowest intercellular CO₂ concentration (Ci), both of them were significantly different from N₀ (P<0.05). The stomatal conductance (Gs) and transpiration rate (Tr) of the nitrogen treatment were different from N₀ Not significant. Water use efficiency (WUE) was significantly higher than N0 (P<0.05). (2) Nitrogen application did not significantly affected the height of alfalfa plants, with the N₂ treatment showing the highest stem diameter, individual plant weight, and leaf weight (P<0.05). (3) With the increase of nitrogen application rate, the yield of alfalfa hay showed a trend of first increased and then decreased, with significant differences under the N₂ treatment (P<0.05). (4) Correlation analysis showed that yield was highly significant and positively correlated (P<0.01) with net photosynthetic rate, individual plant weight and stem thickness, and significantly positively correlated (P<0.05) with water use efficiency and leaf weight.In conclusion. It was recommended to reduce the nitrogen application rate for planting alfalfa in the Horqin Sandy Land to 52.5 kg·hm^-2.

Key words: Horqin Sand Land, Alfalfa, Nitrogen fertilizer, Photosynthetic characteristics

摘要： 为揭示减施氮肥对科尔沁沙地紫花苜蓿(Medicago sativa L.)光合特性及产量的影响，本研究以'骑士T’为材料，设置N₀(0 kg·hm^-2)，N₁(37.5 kg·hm^-2)，N₂(52.5 kg·hm^-2)和N₃(75 kg·hm^-2)共4个施氮处理，研究了苜蓿光合特性、产量及生长特性对氮肥施用量的响应。结果表明：(1)N₂处理的净光合速率(Net photosynthetic rate，Pn)最高，胞间CO₂浓度(Intercellular CO₂concentration，Ci)最低，均与N₀处理差异显著(P＜0.05)；施氮处理的气孔导度(Stomatal conductance，Gs)和蒸腾速率(Transpiration rate，Tr)与对照差异不显著，水分利用效率(Water use efficiency，WUE)则显著高于N₀处理(P<0.05)。(2)施氮未显著影响苜蓿株高(Plant height，PH)，N₂处理的苜蓿茎粗(Stem thick，ST)、单株重(Plant weight，PW)和叶重(Leaf weight，LW)最高(P<0.05)。(3)随施氮量的增加苜蓿干草产量呈先上升后下降的趋势，在N₂处理下差异显著(P<0.05)。(4)相关性分析表明，产量与Pn、PW和ST呈极显著正相关性(P<0.01)，与WUE和LW呈显著正相关(P<0.05)。综上，建议在科尔沁沙地种植紫花苜蓿的施氮量可以减施至52.5 kg·hm^-2。

关键词: 科尔沁沙地, 紫花苜蓿, 氮肥, 光合特性

CLC Number:

S541.9

LIU Ze-yu, SUI Ke, SHAN Xin-he, GAO Qi-fan, ZHANG Yu-xia, ZHANG Yun-long, SUN Tie-nan, WANG Xian-guo. Effects of Different Nitrogen Application Rates on Photosynthetic Characteristics and Yield of Alfalfa in Horqin Sandy Land[J]. Acta Agrestia Sinica, 2024, 32(12): 3973-3979.

刘泽宇, 隋可, 单新河, 高启凡, 张玉霞, 张运龙, 孙铁男, 王显国. 不同施氮量对科尔沁沙地紫花苜蓿光合特性及产量的影响[J]. 草地学报, 2024, 32(12): 3973-3979.

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Effects of Different Nitrogen Application Rates on Photosynthetic Characteristics and Yield of Alfalfa in Horqin Sandy Land

不同施氮量对科尔沁沙地紫花苜蓿光合特性及产量的影响

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