氮添加对贝加尔针茅草原植物和土壤化学计量特征的影响

doi:10.11686/cyxb2017312

摘要/Abstract

摘要： 以贝加尔针茅草原为研究对象,设置N₀(0 kg N·hm^-2)、N₃₀(30 kg N·hm^-2)、N₅₀(50 kg N·hm^-2)、N₁₀₀(100 kg N·hm^-2)、N₁₅₀(150 kg N·hm^-2)5个氮添加水平,研究不同氮添加水平对6种植物叶C、N、P计量特征和土壤C、N、P计量特征的影响,分析植物计量特征与土壤计量特征的相关性,为深入理解N沉降增加对草原群落结构的影响提供基础数据。结果表明,自然条件下,6种植物叶C、N、P含量和计量特征存在显著的差异,表现为扁蓿豆叶C、N、P含量和叶N∶P最高,贝加尔针茅叶N、P含量最低,线叶菊叶C含量最低。氮添加提高了除扁蓿豆以外其他5种植物叶N含量,叶C∶P和叶N∶P,降低了叶P含量和叶C∶N,而叶C含量无一致变化趋势。氮添加提高了土壤有机碳含量、土壤N∶P,对土壤全氮含量和土壤C∶N无显著性影响。羊草、羽茅、线叶菊和草地麻花头叶N含量与土壤有机碳、土壤N∶P呈显著正相关,贝加尔针茅、羊草、羽茅和草地麻花头叶N∶P与土壤有机碳、土壤C∶P呈显著正相关。综合分析表明,土壤有机碳、土壤N∶P和土壤C∶P是影响6种植物叶C、N、P含量和计量特征的主要影响因素,但不同植物对氮添加的响应不同,意味着长期氮添加可能会改变贝加尔针茅草原生态系统的结构。

关键词: 贝加尔针茅草原, 氮添加, 碳氮磷, 化学计量学

Abstract: The objective of this study was to investigate the effects of nitrogen addition on soil and plant carbon (C), nitrogen (N), phosphorus (P) and C∶N∶P ecological stoichiometric characteristics in the Stipa baicalensis grassland of Inner Mongolia, China. The plant study focused on six dominant species: S. baicalensis, Leymus chinensis, Achnatherum sibiricum, Filifolium sibiricum, Melissitus ruthenica and Serratula yamatsutanna. A randomized block design experiment was conducted, with six blocks of five treatments each: N₀ (0 kg N·ha^-1), N₃₀ (30 kg N·ha^-1), N₅₀ (50 kg N·ha^-1), N₁₀₀ (100 kg N·ha^-1) and N₁₅₀ (150 kg N·ha^-1). The results showed that there were significant differences in leaf C, N and P contents and in the stoichiometric characteristics of the six species under natural conditions. Pocockia ruthenica had the highest leaf C, N, and P contents and leaf N∶P, while S. baicalensis had the lowest leaf N and P contents and F. sibiricum had the lowest leaf C content. Leaf C contents did not respond to nitrogen addition in all the six plant species. Leaf N contents, leaf C∶P and leaf N∶P significantly increased but leaf P contents and leaf C∶N decreased with nitrogen addition in five of the species, other than M. ruthenica, which did not respond to nitrogen addition. Soil organic carbon and soil N∶P increased significantly, while soil total nitrogen and soil C∶N showed no significant responses to nitrogen addition. The individual leaf N contents of L. chinensis, A. sibiricum, F. sibiricum and S. yamatsutanna were positively correlated with soil organic carbon and soil N∶P. The leaf N∶P of S. baicalensis, L. chinensis, A. sibiricum and S. yamatsutanna were positively correlated with soil organic carbon and soil N∶P. In conclusion, soil organic carbon, soil N∶P and soil C∶P were the main factors that affected leaf C, N, P contents and the C∶N∶P ecological stoichiometric characteristics of the six plant species, but different species had different responses to nitrogen addition, meaning that long-term nitrogen addition may change the structure of the S. baicalensis grassland ecosystem.

Key words: Stipa baicalensis grassland, nitrogen addition, C,N,P, stoichiometry

刘红梅, 李洁, 王丽丽, 赵建宁, 王慧, 杨殿林. 氮添加对贝加尔针茅草原植物和土壤化学计量特征的影响[J]. 草业学报, 2018, 27(7): 25-35.

LIU Hong-mei, LI Jie, WANG Li-li, ZHAO Jian-ning, WANG Hui, YANG Dian-lin. Effects of nitrogen addition on the stoichiometric characteristics of plants and soil in the Stipa baicalensis grassland of Inner Mongolia, China[J]. Acta Prataculturae Sinica, 2018, 27(7): 25-35.

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