中国草地学报2025，Vol.47Issue(4)：46-57,12.DOI:10.16742/j.zgcdxb.20240303
退化程度对祁连山南麓高寒草甸土壤化学计量特征及酶活性的影响
Effects of Degradation on Soil Stoichiometric Characteristics and Enzyme Activities in Alpine Meadow on the Southern Slope of the Qilian Mountains
摘要
Abstract
To investigate the effects of degradation on soil stoichiometry and enzyme activity in alpine meadows,this study analyzed the trends and interactions among soil pH,nutrients,stoichiometric ratios,and hydrolytic enzyme activity across native vegetation,as well as mildly,moderately,and severely degraded alpine meadows on the southern slope of the Qilian Mountains.The results showed as follows:(1)The effects of degradation on soil nutrients were primarily observed in the 0-10 cm soil layer.With increasing degradation severity,total phosphorus(TP)in the 0-10 cm layer gradually increased,while soil inorganic carbon(SIC)and the phosphorus potassium ratio(P∶K)initially remained stable before increas-ing.In contrast,soil organic carbon(SOC),total carbon(TC),and total nitrogen(TN)showed a gradual decline.The carbon phosphorus ratio(C∶P)and nitrogen phosphorus ratio(N∶P)showed a gradu-ally decreasing trend.Meanwhile,soil available phosphorus(SAP)increased before declining and then sta-bilized,whereas the soil carbon nitrogen ratio(C∶N),carbon potassium ratio(C∶K),and nitrogen potas-sium ratio(N∶K)ratios showed no significant changes.(2)With increasing degradation intensity,the activites of β-1,4-xylosidase(BX),acid phosphatase(AP),and β-cellobiosidase(BCE)in the 0-10 cm soil layer remained largely unchanged.However,β-glucosidase(BG)and β-N-acetylglucosaminidase(NAG)exhibited an initial stabilization followed by a decline.(3)Monte Carlo test result indicated that soil pH,P∶K,and total potassium(TK)were the most influential factors on soil enzyme activity,with explanatory rates of 11.5%,11.6%,and 11.1%,respectively.In conclusion,the effects of degradation on soil stoichiometry and enzyme activity in alpine meadows on the southern slope of the Qilian Mountains were primarily concentrated in the 0-10 cm surface soil layer.Soil stoichiometry significantly affected enzyme activity,highlighting the importance of surface soil stoichiometric monitoring for assessing alpine meadow degradation.关键词
退化程度/高寒草甸/土壤化学计量/土壤水解酶Key words
Degradation severity/Alpine meadow/Soil stoichiometry/Soil hydrolytic enzyme分类
农业科技引用本文复制引用
张铭洋,郭龙欣,杨永胜,张莉,孙玉,胥子健,张永坤..退化程度对祁连山南麓高寒草甸土壤化学计量特征及酶活性的影响[J].中国草地学报,2025,47(4):46-57,12.基金项目
青海省应用基础研究项目(2022-ZJ-716) （2022-ZJ-716）
国家自然科学基金(42207375) （42207375）
