Effects of Phosphorus Addition on Stoichiometric Traits and Nutrient Resorption Efficiency in Bluegrass Leaves

doi:10.11733/j.issn.1007-0435.2026.03.019

Acta Agrestia Sinica ›› 2026, Vol. 34 ›› Issue (3): 949-959.DOI: 10.11733/j.issn.1007-0435.2026.03.019

Effects of Phosphorus Addition on Stoichiometric Traits and Nutrient Resorption Efficiency in Bluegrass Leaves

WANG Xiao-li^1,2, WANG Qian¹, XU Hang^1,2, HE Ke-yan^1,2, WANG Jia-hao³, SONG Mei-qi^1,2, JIN Ling^1,2, WEI Xiao-xing^1,2

1. Qinghai University, Xining, Qinghai Province 810016, China;
2. Qinghai University/Key Laboratory of Superior Forage Germplasm in the Qinghai-Tibetan Plateau, The Academy of Animal and Veterinary Science, Xining, Qinghai Province 810016, China;
3. Grassland Research Institute, Chinese Academy of Agricultural Sciences, Hohhot, Inner Mongolia 010010, China

Received:2025-04-22 Revised:2025-05-27 Published:2026-03-23

磷添加对早熟禾叶片化学计量特征和养分重吸收效率的影响

王晓丽^1,2, 王倩¹, 徐航^1,2, 何克燕^1,2, 王佳豪³, 宋美琪^1,2, 金玲^1,2, 魏小星^1,2

1. 青海大学, 青海西宁 810016;
2. 青海省青藏高原优质牧草种质资源利用重点实验室/青海大学畜牧兽医科学院, 青海西宁 810016;
3. 中国农业科学院草原研究所, 内蒙古呼和浩特 010010

通讯作者: 魏小星，E-mail：wuiko@163.com
作者简介:王晓丽（1997-），女，汉族，山西沁水人，博士，主要从事青藏高原抗逆草种质资源创新与利用研究，E-mail：1640765149@qq.com；
基金资助:
青海省基础研究计划（2023-ZJ-942J）；青海省高端创新人才计划（2024-LJ87）资助

Abstract

Abstract: In this study， Poa pratensis var. Qinghai was used as the research subject. The changing trends in leaf stoichiometric ratios and nutrient resorption efficiency under six phosphorus （P） addition levels （30， 45， 60， 75， 90， and 105 kg·hm^-²， sequentially labeled as P₁， P₂， P₃， P₄， P₅， and P₆） were investigated. The results indicated：（1） The leaf carbon （C）， nitrogen （N）， and P contents generally exhibited the pattern of senescent stage < full ripeness stage < milky ripeness stage， with the highest accumulation of leaf nutrient contents observed under the P₃ level. （2） Leaf C/N and C/P ratios generally followed the pattern of senescent stage > full ripeness stage > milky ripeness stage， while the N/P ratio generally showed full ripeness stage > milky ripeness stage > senescent stage. （3） The Nitrogen Reabsorption Efficiency （NRE） was the highest under the CK （control， no P addition） treatment， whereas the Phosphorus Reabsorption Efficiency （PRE） was the highest under the P₂ addition level. （4） A generally positive correlation was observed between leaf NRE and stoichiometric ratios， while PRE exhibited a generally negative correlation with stoichiometric ratios in mature leaves and a generally positive correlation with stoichiometric ratios in litter leaves. This study suggests that the appropriate P addition amount is P₂-P₃ （45~60 kg·hm^-2）. This research provides practical guidance for precision fertilization and scientific management of artificial grasslands in alpine regions.

Key words: Poa pratensis var.Qinghai, Phosphorus addition, Phenological stages, Ecological stoichiometry, Nutrient reabsorption efficiency

摘要： 本研究以青海扁茎早熟禾（Poa pratensis var. Qinghai）为研究对象，探究在6个磷（P）添加水平下（30，45，60，75，90，105 kg·hm^-2，依次标记为P₁，P₂，P₃，P₄，P₅，P₆），其叶片的化学计量比和养分重吸收效率的变化趋势。结果表明：（1）叶片碳（C）、氮（N）、磷（P）含量普遍呈现枯黄期<完熟期<乳熟期，且在P3水平下叶片养分含量累积最高；（2）叶片C/N和C/P普遍呈现枯黄期>完熟期>乳熟期，N/P普遍呈现完熟期>乳熟期>枯黄期；（3）叶片氮重吸收效率（Nitrogen reabsorption efficiency，NRE）在CK处理下最高，磷重吸收效率（Phosphorus reabsorption efficiency，PRE）在P₂添加下最高；（4）叶片NRE与化学计量比普遍呈正相关关系，PRE与成熟叶片化学计量比普遍呈负相关关系，与凋落叶片化学计量比普遍呈正相关关系。本研究认为适宜的P添加量为P₂-P₃（45~60 kg·hm^-2）。本研究为高寒区人工草地的精准施肥与科学管理提供了实践性指导。

关键词: ‘青海’扁茎早熟禾, 磷添加, 生长时期, 生态化学计量, 养分重吸收

CLC Number:

S544.9

WANG Xiao-li, WANG Qian, XU Hang, HE Ke-yan, WANG Jia-hao, SONG Mei-qi, JIN Ling, WEI Xiao-xing. Effects of Phosphorus Addition on Stoichiometric Traits and Nutrient Resorption Efficiency in Bluegrass Leaves[J]. Acta Agrestia Sinica, 2026, 34(3): 949-959.

王晓丽, 王倩, 徐航, 何克燕, 王佳豪, 宋美琪, 金玲, 魏小星. 磷添加对早熟禾叶片化学计量特征和养分重吸收效率的影响[J]. 草地学报, 2026, 34(3): 949-959.

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Effects of Phosphorus Addition on Stoichiometric Traits and Nutrient Resorption Efficiency in Bluegrass Leaves

磷添加对早熟禾叶片化学计量特征和养分重吸收效率的影响

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