羊草和紫花苜蓿人工草地光合特性

doi:10.13287/j.1001-9332.202310.009

应用生态学报 ›› 2023, Vol. 34 ›› Issue (10): 2655-2662.doi: 10.13287/j.1001-9332.202310.009

羊草和紫花苜蓿人工草地光合特性

时一平¹, 宋彦涛¹, 那木汗^1,2, 彭擎天¹, 吕林有³, 申悦¹, 倩娜⁴, 乌云娜^1*

¹大连民族大学环境与资源学院, 辽宁大连 116600;
²沈阳农业大学生物科学技术学院, 沈阳 110866;
³辽宁省沙地治理与利用研究所, 辽宁阜新 123008;
⁴内蒙古自治区国土空间规划院, 呼和浩特 010010

收稿日期:2023-05-16 接受日期:2023-08-24 出版日期:2023-10-15 发布日期:2024-04-15
通讯作者: * E-mail: wuyunna@dlnu.edu.cn
作者简介:时一平, 男, 1998年生, 硕士研究生。主要从事禾豆混播人工草地生态系统研究。E-mail: shiyiping0418@163.com
基金资助:
国家自然科学基金项目(31971750)、国家民委中青年英才培养计划项目(2022)和中央高校基本科研业务费项目(2023)

Photosynthetic characteristics of Leymus chinensis and Medicago sativa in artificial grassland

SHI Yiping¹, SONG Yantao¹, Namuhan^1,2, PENG Qingtian¹, LYU Linyou³, SHEN Yue¹, Qian Na⁴, Wu Yunna^1*

¹College of Environment and Resources, Dalian Minzu University, Dalian 116600, Liaoning, China;
²College of Bioscience and Biotechnology, Shenyang Agricultural University, Shenyang 110866, China;
³Research Institute of Sand Control and Utilization, Fuxin 123008, Liaoning, China;
⁴Inner Mongolia Autonomous Region Land and Spatial Planning Institute, Hohhot 010010, China

Received:2023-05-16 Accepted:2023-08-24 Online:2023-10-15 Published:2024-04-15

摘要/Abstract

摘要： 为探究单播与混播人工草地对羊草和紫花苜蓿光合特性的影响,测定2种牧草光合特性日变化进程,比较不同处理下羊草和紫花苜蓿光合特征。结果表明: 单播处理下,羊草和紫花苜蓿的净光合速率、蒸腾速率、叶片温度呈单峰型,紫花苜蓿的气孔导度呈单峰型,羊草的气孔导度和水分利用效率呈双峰型。混播处理下,羊草和紫花苜蓿的净光合速率、蒸腾速率、叶片温度日变化呈单峰型,羊草的气孔导度和水分利用效率呈单峰型,紫花苜蓿的气孔导度呈双峰型。混播处理下,羊草净光合速率峰值显著高于单播,分别为17.72和13.65 μmol CO₂·m^-2·s^-1。单播和混播处理下,羊草叶绿素含量均高于紫花苜蓿,羊草叶片氮含量均低于紫花苜蓿,且混播羊草叶片氮含量显著高于单播羊草,二者分别为27.60和22.55 g·kg^-1。不同种植方式下,羊草和紫花苜蓿的净光合速率与气孔导度、蒸腾速率呈显著正相关,与胞间CO₂浓度呈显著负相关,紫花苜蓿的净光合速率与叶片温度、水分利用效率呈显著正相关。混播处理有利于增加羊草叶片氮含量。试验结果为牧草光合特性对人工草地种植方式的响应提供理论基础。

关键词: 羊草, 紫花苜蓿, 光合作用, 叶绿素

Abstract: To explore the effect of monoculture and mixture sowing artificial grassland on the photosynthetic characteristics of Leymus chinensis and Medicago sativa, we determined the diurnal variation of photosynthetic properties of L. chinensis and M. sativa under different treatments. The results showed that the diurnal changes of net photosynthetic rate, blade temperature and transpiration rate of L. chinensis and M. sativa showed ‘unimodal type’ in monoculture, the stomatal conductance of M. sativa showed ‘unimodal type’, and the stomatal conductance and water use efficiency of L. chinensis showed ‘bimodal type’. Under the mixed sowing treatment, the diurnal changes of net photosynthetic rate, blade temperature and transpiration rate of L. chinensis and M. sativa showed ‘unimodal type’, the stomatal conductance and water use efficiency of L. chinensis showed ‘unimodal type’, and the stomatal conductance of M. sativa showed ‘bimodal type’. The peak photosynthetic rate of L. chinensis under mixture was signi-ficantly higher than that under monoculture, being 17.72 and 13.65 μmol CO₂·m^-2·s^-1, respectively. Under monoculture and mixture sowing treatments, the chlorophyll content of L. chinensis was higher than that of M. sativa, nitrogen content of the leaves of L. chinensis was lower than that of M. sativa, and the nitrogen content in the leaves of mixture sowing L. chinensis was significantly higher than that of monoculture sowing L. chinensis, which were 27.60 and 22.55 g·kg^-1, respectively. Net photosynthetic rates of L. chinensis and M. sativa were significantly positively correlated with stomatal conductance and transpiration rate, and significantly negatively correlated with intercellular CO₂ concentration under different planting methods. Net photosynthetic rate of M. sativa was significantly positively correlated with blade temperature and water use efficiency. In summary, mixed sowing was beneficial to enhance nitrogen content of L. chinensis. Our results provided a theoretical basis for the response of the photosynthetic characteristics of forage to planting mode of artificial grassland.

Key words: Leymus chinensis, Medicago sativa, photosynthesis, chlorophyll

时一平, 宋彦涛, 那木汗, 彭擎天, 吕林有, 申悦, 倩娜, 乌云娜. 羊草和紫花苜蓿人工草地光合特性[J]. 应用生态学报, 2023, 34(10): 2655-2662.

SHI Yiping, SONG Yantao, Namuhan, PENG Qingtian, LYU Linyou, SHEN Yue, Qian Na, Wu Yunna. Photosynthetic characteristics of Leymus chinensis and Medicago sativa in artificial grassland[J]. Chinese Journal of Applied Ecology, 2023, 34(10): 2655-2662.

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羊草和紫花苜蓿人工草地光合特性

Photosynthetic characteristics of Leymus chinensis and Medicago sativa in artificial grassland

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