中国草地学报2025，Vol.47Issue(3)：20-30,11.DOI:10.16742/j.zgcdxb.20240277
降水变化对荒漠草原土壤碳氮磷生态化学计量的影响
Influence of Precipitation Change on the Ecological Stoichiometry of Carbon,Nitrogen,and Phosphorus within Desert Steppe Soil
摘要
Abstract
This research aims to investigate the effects of variations in precipitation on the ecological stoichiometry of soil organic carbon(SOC),total nitrogen(TN),and total phosphorus(TP)in desert steppes and to reveal the response of C,N,and P and their ecological stoichiometry to precipitation gradi-ents in desert steppe ecosystems.The experiment was conducted in temperate desert steppe on the south-ern edge of Mu Us Desert,Yanchi County,Ningxia Hui Autonomous Region.Five precipitation levels,33%,66%,100%,133%,and 166%of natural precipitation(G1,G2,G3,G4,G5),were simulated by rainout shelters and manual water replenishment.Variation patterns of SOC,TN,TP contents across soil layers(0-10 cm,10-20 cm,and 20-30 cm)were analyzed under different precipitation levels.The results indicate that:(1)When precipitation increased(G4),the SOC,TN,and TP contents,and soil C∶P and N∶P ratios in 10-20 cm and 20-30 cm soils were significantly lower than in 0-10 cm soils(P<0.05).How-ever,the TP content did not respond significantly to precipitation changes.(2)With the increasing of soil layer depth,the correlation between the contents and ratios of SOC,TN,and TP within soil followed the order of 20-30 cm>10-20 cm>0-10 cm;(3)The variation in the SOC,TN,and TP contents was the highest in the 20-30 cm layer,followed by the 10-20 cm,and was the lowest in 0-10 cm.The variation of soil TP content was the least for all the three soil layers.In conclusion,precipitation changes have a signifi-cant impact on the ecological stoichiometry of soil carbon,nitrogen,and phosphorus,and the variation of carbon,nitrogen,and phosphorus in deep soil is greater.Deep soil(20-30 cm)is more responsive to pre-cipitation changes than surface soil(0-20 cm),indicating that the ecological stoichiometry of desert steppe soils is more sensitive to precipitation in deeper layers.关键词
荒漠草原/降水梯度/土壤碳、氮、磷/生态化学计量Key words
Desert steppe/Precipitation gradient/Soil carbon,nitrogen,and phosphorus/Ecological stoichiometry分类
农业科技引用本文复制引用
杨雪琴,李建平,连佳丽,韩翠,罗叙,赵莹,赵雅欣..降水变化对荒漠草原土壤碳氮磷生态化学计量的影响[J].中国草地学报,2025,47(3):20-30,11.基金项目
国家自然科学基金项目(32160336) （32160336）
宁夏自然科学基金项目(2023AAC3092) （2023AAC3092）
