中国草地学报2025，Vol.47Issue(5)：21-33,13.DOI:10.16742/j.zgcdxb.20240325
增温及氮沉降对青藏高原高寒草甸植物-土壤-酶生态化学计量特征的影响
Effects of Warming and Nitrogen Deposition on the Ecological Stoichiometry of Plant-Soil-Enzyme Systems in Qinghai-Xizang Alpine Meadows
摘要
Abstract
Warming and nitrogen deposition can affect the functions and structures of alpine meadow ecosys-tems on the Qinghai-Xizang Plateau.Ecological stoichiometry provides a framework to understand the biogeo-chemical cycling of nutrients between plant and soil.This study conducted a field experiment in an alpine meadow of Qinghai Province,to investigate the effects of different levels of warming and nitrogen deposition.The warming treatment included four levels:W0(no warming),W1(air temperature increases 0.47 °C,soil temperature increases 0.61 °C),W2(air temperature increases 0.92 °C,soil temperature increases 1.09 °C),W3(air temperature increases 1.44 °C,soil temperature increases 1.95 °C).Nitrogen application treatments included:N0(no nitrogen application),16 kg N/(hm2·a),and 32 kg N/(hm2·a).The experiment assessed changes in carbon,nitrogen,and phosphorus contents in plant and soil,soil enzyme activity,and their stoichio-metric ratios,as well as the relationship among these components.The results showed as follows:Warming significantly increased total nitrogen in the aboveground plant tissues,soil total nitrogen,soil organic carbon,the soil nitrogen phosphorus ratio,and the enzyme nitrogen phosphorus ratio.Simultaneously,it significantly decreased the carbon nitrogen ratio in aboveground plant biomass,and the carbon nitrogen and carbon phospho-rus ratios of soil enzymes.Nitrogen deposition significantly increased total nitrogen in both aboveground and root tissues,soil organic carbon,soil total nitrogen,and the enzyme carbon nitrogen ratio.It significantly decreased the root carbon nitrogen ratio and enzyme nitrogen phosphorus ratio.The interaction between nitro-gen deposition and warming significantly affected soil organic carbon content and the carbon nitrogen,carbon phosphorus,and nitrogen phosphorus ratios of soil enzymes.Analysis of stoichiometric homeostasis in plant tis-sues in responses to soil elements and enzyme activities revealed strict stoichiometric homeostasis in plant tis-sues under both warming and nitrogen deposition.Soil total nitrogen,soil carbon nitrogen ratio,and soil β-1,4-xylosidase activity significantly influenced plant nutrient content and stoichiometry.In summary,short-term warming and nitrogen deposition significantly alter the stoichiometry of soil and enzyme systems in alpine mead-ows,which in turn influences the nutrient acquisition strategies of plants on the Qinghai-Xizang Plateau.关键词
增温/氮沉降/高寒草甸/生态化学计量/酶活性/土壤养分/植物养分Key words
Warming/Nitrogen deposition/Alpine meadow/Ecological stoichiometry/Enzyme activ-ity/Soil nutrients/Plant nutrients分类
农业科技引用本文复制引用
向雪梅,德科加,张琳,林伟山,冯廷旭,李菲,魏希杰..增温及氮沉降对青藏高原高寒草甸植物-土壤-酶生态化学计量特征的影响[J].中国草地学报,2025,47(5):21-33,13.基金项目
青海省科技厅重点研发与转化计划项目(2024-NK-137) （2024-NK-137）
称多县一年生饲草种子繁殖与青贮加工贮藏技术研究与示范(2024-NK-P28) （2024-NK-P28）
2024年度中国科协青年人才托举工程博士生专项计划 （）
