Effects of Various Nitrogen Forms Addition on Grassland Biomass in the Agro-Pastoral Ecotone in Northern Shanxi

doi:10.11733/j.issn.1007-0435.2025.07.015

Acta Agrestia Sinica ›› 2025, Vol. 33 ›› Issue (7): 2198-2205.DOI: 10.11733/j.issn.1007-0435.2025.07.015

Effects of Various Nitrogen Forms Addition on Grassland Biomass in the Agro-Pastoral Ecotone in Northern Shanxi

ZHONG Hua^1,3,4, HAO Jie^2,3,4, LIANG Wen-jun^1,3,4, Gao Yang-yang^1,3,4, LI Lang^1,3,4, WANG Ya-nan^1,3,4, WANG Chang-hui^1,3,4, DONG Kuan-hu^1,3,4

1. College of Grassland Science, Shanxi Agricultural University, Taigu, Shanxi Province 030801, China;
2. College of Forestry, Shanxi Agricultural University, Taigu, Shanxi Province 030801, China;
3. Shanxi Key Laboratory of Grassland Ecological Protection and Native Grass Germplasm Innovation, Taigu, Shanxi Province 030801, China;
4. Youyu Loess Plateau Grassland Ecosystem Research Station, Youyu, Shanxi Province 037200, China

Received:2024-11-01 Revised:2025-01-04 Online:2025-07-15 Published:2025-07-18

不同形态氮添加对晋北农牧交错带草地生物量的影响

钟华^1,3,4, 郝杰^2,3,4, 梁雯君^1,3,4, 高阳阳^1,3,4, 李朗^1,3,4, 王雅楠^1,3,4, 王常慧^1,3,4, 董宽虎^1,3,4

1. 山西农业大学草业学院, 山西太谷 030801;
2. 山西农业大学林学院, 山西太谷 030801;
3. 草地生态保护与乡土草种质创新山西省重点实验室, 山西太谷 030801;
4. 山西右玉黄土高原草地生态系统国家定位观测研究站, 山西右玉 037200

通讯作者: 董宽虎,E-mail:dongkuanhu@sxau.edu.cn
作者简介:钟华（1979-），女，汉族，山西岢岚人，博士，实验师，主要从事牧草种质资源开发与利用研究，E-mail：zhonghua109@126.com
基金资助:
国家自然科学基金区域创新发展联合基金重点项目（U22A20576）资助

Abstract

Abstract: At present， the effects of various nitrogen forms on grassland productivity in the Agro-pastoral ecotone of northern Shanxi remain poorly elucidated. To investigate the effects on grassland biomass and its allocation between aboveground and belowground components， the study was conducted with six treatments： control， ammonium nitrate， ammonium sulfate， ammonium bicarbonate， urea， and slow-release urea. The results showed that various forms of nitrogen addition increased aboveground， belowground， and total biomass by increasing plant community diversity， height， and cover. Notably， the addition of NH₄NO₃ significantly elevated soil inorganic nitrogen content， resulting in the greatest increase in aboveground biomass. In contrast， the urea treatment resulted in a moderate rise in soil inorganic nitrogen， which promoted root growth and thus increased the allocation ratio of belowground biomass. This study revealed the varied effects of various nitrogen forms on plant biomass allocation and emphasized the positive effect of a urea input of 10 g·m^-2·a^-1 on maintaining the productivity of grasslands in the Agro-pastoral ecotone of northern Shanxi.

Key words: Biomass, Nitrogen compounds, Agro-pastoral ecotone, Plant communities, Urea

摘要： 目前，多种形态氮输入对晋北农牧交错带草地生产性能的影响尚不清楚。本研究通过设置对照、硝酸铵、硫酸铵、碳酸氢铵、尿素和缓释尿素6个处理，旨在探索这些不同形态氮添加对草地生物量及其地上与地下分配的影响。结果表明：不同形态的氮添加通过增加植物群落多度、高度与盖度提高了地上、地下和总生物量；其中，硝酸铵添加显著增加了土壤中无机氮含量，进而对地上生物量的提升最大。而与其他形态氮添加相比，尿素处理诱导的土壤无机氮含量适度增加促进了根系生长，从而提高了地下生物量的分配比例。本研究揭示了不同形态氮添加对植物生物量分配的不同影响，并强调了10 g·m^-2·a^-1的尿素输入对维持北方农牧交错带草地的生产力具有积极作用。

关键词: 生物量, 氮化合物, 农牧交错带, 植物群落, 尿素

CLC Number:

S812.2

ZHONG Hua, HAO Jie, LIANG Wen-jun, Gao Yang-yang, LI Lang, WANG Ya-nan, WANG Chang-hui, DONG Kuan-hu. Effects of Various Nitrogen Forms Addition on Grassland Biomass in the Agro-Pastoral Ecotone in Northern Shanxi[J]. Acta Agrestia Sinica, 2025, 33(7): 2198-2205.

钟华, 郝杰, 梁雯君, 高阳阳, 李朗, 王雅楠, 王常慧, 董宽虎. 不同形态氮添加对晋北农牧交错带草地生物量的影响[J]. 草地学报, 2025, 33(7): 2198-2205.

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Effects of Various Nitrogen Forms Addition on Grassland Biomass in the Agro-Pastoral Ecotone in Northern Shanxi

不同形态氮添加对晋北农牧交错带草地生物量的影响

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