Effects of Long-term Nitrogen Application and Cutting on Plant Phosphorus Uptake of Leymus chinensis Meadow in Songnen Plain

doi:10.11733/j.issn.1007-0435.2024.11.014

Acta Agrestia Sinica ›› 2024, Vol. 32 ›› Issue (11): 3462-3471.DOI: 10.11733/j.issn.1007-0435.2024.11.014

Effects of Long-term Nitrogen Application and Cutting on Plant Phosphorus Uptake of Leymus chinensis Meadow in Songnen Plain

FU Hao-ran¹, HU Ming-xin¹, LI Meng¹, LIAN Xiao-qing¹, LIU Han-zi¹, TIAN Yu¹, LI Qiang^2,3

1. College of Forestry and Grassland Science, Jilin Agricultural University/Jilin Provincial Key Laboratory of Forestry and Grassland Genetics and Breeding, Changchun, Jilin Province 130118, China;
2. Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, Jilin Province 130102, China;
3. Jilin Provincial Key Laboratory of Grassland Farming, Changchun, Jilin Province 130102, China

Received:2024-04-09 Revised:2024-05-13 Published:2024-11-29

长期施氮和刈割对松嫩平原羊草草甸植物磷吸收的影响

傅浩然¹, 胡明欣¹, 李萌¹, 连小晴¹, 刘涵姿¹, 田雨¹, 李强^2,3

1. 吉林农业大学林学与草学学院/吉林省林草遗传育种重点实验室, 吉林长春 130118;
2. 中国科学院东北地理与农业生态研究所, 吉林长春 130102;
3. 吉林省草地畜牧重点实验室, 吉林长春 130102

通讯作者: 李强,E-mail:liqiang@iga.ac.cn
作者简介:傅浩然(1999-),男,汉族,安徽滁州人,硕士研究生,主要从事草地管理与利用研究,E-mail:20220004@mails.jlau.edu.cn
基金资助:
国家自然科学基金区域创新发展联合基金U23A2004资助

Abstract

Abstract: Mowing may further intensify P limitation under elevated nitrogen availability. However,how mowing management under N enrichment affects P utilization of grassland plants remains unclear. Therefore,this study focused on the Songnen grassland,and then investigated the interactive effects of N application and mowing on plant P uptake and related plant characteristics by long-term field observations. The results indicated that nitrogen addition reduced the P availability and increased the N:P ratio in the soil. Additionally,mowing further promotes the decline of P availability content and increases the soil N:P ratio. Under N enrichment,the P concentration in plants decreased,and mowing exacerbated the decline in plant P concentration. Moreover,N enrichment improved root morphological indices and reduced the inorganic phosphorus concentration in the rhizosphere,with mowing enhancing the adaptive adjustments of root morphology. This study indicated that long-term nitrogen addition reduces soil P availability and increased the N∶P ratio in the soil,and plants can adapt to relative P limitation by lowering their P concentration for adjusting the N∶P ratio,and regulating root structure for intensifying P acquisition. Mowing can further reinforce these adaptive mechanisms.

Key words: Leymus chinensis meadow, Nitrogen addition, Mowing, Phosphorus absorption

摘要： 氮增加背景下刈割可能进一步加剧草地磷限制的进程，然而刈割管理如何改变草地植物磷利用特征仍有待深入研究。据此，本研究以松嫩草地为研究对象，通过野外长期定位观测实验，研究了氮增加和刈割交互作用对植物磷吸收及其相关特征的影响。结果表明：氮的增加降低了土壤中速效磷的含量，提高了氮磷比。同时，刈割加剧了速效磷含量的降低和氮磷比的提升。在氮增加下，植物体内磷浓度降低；而刈割则进一步加剧了植物磷浓度的下降。此外，氮增加还改善了根系形态指标，降低了根际中的无机磷含量，刈割对根系形态的适应性调整也表现出上调作用。这表明在长期施氮导致土壤速效磷减少和氮磷比增加下，植物通过降低磷浓度和调整氮磷比，以及改变根系结构和功能来适应磷的相对限制，而刈割则强化了这种适应机制。

关键词: 羊草草甸, 氮添加, 刈割, 磷吸收

CLC Number:

S812

FU Hao-ran, HU Ming-xin, LI Meng, LIAN Xiao-qing, LIU Han-zi, TIAN Yu, LI Qiang. Effects of Long-term Nitrogen Application and Cutting on Plant Phosphorus Uptake of Leymus chinensis Meadow in Songnen Plain[J]. Acta Agrestia Sinica, 2024, 32(11): 3462-3471.

傅浩然, 胡明欣, 李萌, 连小晴, 刘涵姿, 田雨, 李强. 长期施氮和刈割对松嫩平原羊草草甸植物磷吸收的影响[J]. 草地学报, 2024, 32(11): 3462-3471.

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Effects of Long-term Nitrogen Application and Cutting on Plant Phosphorus Uptake of Leymus chinensis Meadow in Songnen Plain

长期施氮和刈割对松嫩平原羊草草甸植物磷吸收的影响

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