Research on the Nitrogen and Phosphorus Homeostasis of Plant Community of Desert Steppe under Different Stocking Rates

doi:10.11733/j.issn.1007-0435.2026.06.012

Acta Agrestia Sinica ›› 2026, Vol. 34 ›› Issue (6): 2090-2098.DOI: 10.11733/j.issn.1007-0435.2026.06.012

Research on the Nitrogen and Phosphorus Homeostasis of Plant Community of Desert Steppe under Different Stocking Rates

WANG Rong, Lü Shi-jie, ZHANG Bo-han, QU Zhi-qiang, LI Zhi-guo

College of Grass Industry, Inner Mongolia Agricultural University/Key Laboratory of Grassland Resources, Ministry of Education, Hohhot, Inner Mongolia 010011, China

Received:2025-10-14 Revised:2026-01-03 Published:2026-06-02

不同载畜率下荒漠草原植物群落氮磷内稳性研究

汪蓉, 吕世杰, 张博涵, 屈志强, 李治国

内蒙古农业大学草业学院/草地资源教育部重点实验室, 内蒙古呼和浩特 010011

通讯作者: 李治国,E-mail:nmndlzg@163.com
作者简介:汪蓉(1999-),女,汉族,青海海东人,硕士研究生,主要从事草地资源与管理研究,E-mail:wr19490@163.com
基金资助:
国家重点研发项目-基于生态和经济双赢的草地-家畜系统可持续管理研究（2024YFE0113100）；内蒙古自治区“揭榜挂帅”项目“荒漠草原综合治理与家庭牧场可持续管理集成技术示范”（2024JBGS0011）；内蒙古自治区一流学科科研专项项目（YLXKZX-NND-029）；国家自然科学基金项目（32060384）资助

Abstract

Abstract: In order to study the nitrogen and phosphorus homoeostasis of plant community of desert steppe under different stocking rates， the Stipa breviflora desert steppe in Inner Mongolia was used as the research object. The grazing experiment adopted a completely randomized block design， with a total of 4 levels of stocking rate and 3 repetitions， namely control （CK）， light grazing （LG）， moderate grazing （MG） and heavy grazing （HG） [sheep units·hm^-2·0.5a^-1]. The total nitrogen （TN） and the total phosphorus （TP） in plant community and soil were measured， and than calculated the homeostasis index （H）， the results showed that the interaction between grazing and soil layer had no significant effect on the soil. Grazing attenuated TN and TP homeostatic regulation of the plant community. When the stocking rate was <1.1 or> 3.65， TN homeostasis was weakly homeostatic. The TP homeostasis was enhanced in HG. When the stocking rate was <1.09 or> 2.78， TP homeostasis was weakly homeostatic. The N∶P homeostasis was the strongest in MG， and when the stocking rate ranged from 0.17 to 1.9， the N∶P homeostasis was weakly homeostatic. Overall， when the stocking rate ranged from 0.17 to 1.09， which is a light to moderate grazing level， the grassland ecosystem had homeostatic regulation. The stocking rate has a minimum threshold of 2.37 for H_TN and 1.94 for H_TP， while a maximum threshold of 1.03 exists for H_N∶P.

Key words: Desert steppe, Plant community, Stocking rate, Ecological stoichiometry, Homoeostasis

摘要： 为研究不同载畜率下荒漠草原植物群落氮磷内稳性特征，本文以内蒙古荒漠草原为研究对象，采取完全随机区组设计，共设置4个载畜率水平，3次重复，分别为对照组（Control，CK）0、轻度（Light stocking rate，LG）0.19、中度（Moderate stocking rate，MG）1.82和重度（Heavy stocking rate，HG）2.71[羊单位·hm^-2·（0.5a）^-1]。通过测定植物群落和土壤全氮（Total nitrogen，TN）、全磷（Total phosphorus，TP）含量，并计算内稳性指数（Homeostasis index，H），结果显示：放牧与土层的交互作用对土壤无显著影响。放牧降低了植物群落TN和TP含量及其内稳性，当载畜率<1.1或>3.65时，TN内稳性为弱稳态。TP内稳性在HG区有所增强，当载畜率<1.09或>2.78时TP为弱稳态。MG区N∶P内稳性最强，当载畜率为0.17~1.9时N∶P内稳性为弱稳态。总体来看，当载畜率为0.17~1.09，为轻中度放牧时，草地生态系统均具有一定的稳态调节能力。载畜率对H_TN和H_TP均存在一个最小阈值2.37和1.94；对H_N∶P存在一个最大阈值1.03。

关键词: 荒漠草原, 植物群落, 载畜率, 生态化学计量, 内稳性

CLC Number:

S812

WANG Rong, Lü Shi-jie, ZHANG Bo-han, QU Zhi-qiang, LI Zhi-guo. Research on the Nitrogen and Phosphorus Homeostasis of Plant Community of Desert Steppe under Different Stocking Rates[J]. Acta Agrestia Sinica, 2026, 34(6): 2090-2098.

汪蓉, 吕世杰, 张博涵, 屈志强, 李治国. 不同载畜率下荒漠草原植物群落氮磷内稳性研究[J]. 草地学报, 2026, 34(6): 2090-2098.

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Research on the Nitrogen and Phosphorus Homeostasis of Plant Community of Desert Steppe under Different Stocking Rates

不同载畜率下荒漠草原植物群落氮磷内稳性研究

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