水土保持学报2025，Vol.39Issue(2)：102-110,9.DOI:10.13870/j.cnki.stbcxb.2025.02.040
河西走廊盐碱地4种典型植被类型土壤理化性质和酶活性特征
Soil Physicochemical Properties and Enzyme Activity Characteristics of Four Typical Vegetation Types in Saline-alkali Lands of the Hexi Corridor
摘要
Abstract
[Objective]To explore the changes of soil physical and chemical properties and enzyme activities of four vegetation types in desert saline-alkali lands in the Hexi Corridor and their influencing factors,and to provide a theoretical basis for soil nutrient cycling and regulation mechanism in desert saline-alkali lands.[Methods]Taking the desert saline-alkali soil in the Hexi Corridor as the research object,four typical vegetation types,including Lycium ruthenicum Murr.single community(HH),L.ruthenicum and Phragmites australis community(HL),L.ruthenicum and Alhagi camelorum Fisch.community(HT),L.ruthenicum and Tamarix chinensis Lour.community(HC),were selected.Three replicate plots were set up for each vegetation type.Through the combination of field investigation and indoor analysis,soil physical and chemical properties(including organic carbon,total nitrogen,total phosphorus)and enzyme activities(including urease,alkaline phosphatase,nitrate reductase,nitrite reductase)of the four vegetation types were measured.Variance analysis and redundancy analysis were used to evaluate the differences in soil physical and chemical properties and enzyme activities,and the influencing factors were analyzed.[Results]In the soil of the four different vegetation types in the Hexi Corridor,organic carbon content increased with the increase of soil depth,being the highest in HC and the lowest in HH,and the difference was significant(p<0.05).Total nitrogen content decreased with the increase of soil depth,being the highest in HH and the lowest in HC,and the difference was significant(p<0.05).There was no significant change in total phosphorus(p>0.05).The activities of urease,alkaline phosphatase,nitrate reductase and nitrite reductase decreased with the increase of soil depth,showing the phenomenon of surface aggregation.The activities of alkaline phosphatase,nitrate reductase and nitrite reductase were significantly different among different vegetation types(p<0.05),being the highest in HL,HH and HT,and the lowest in HT,HC and HH,respectively.Total nitrogen content was significantly positively correlated with urease and nitrate reductase activities(p<0.05).In the 20-40 cm soil layer,organic carbon content was significantly negatively correlated with urease and nitrate reductase activities(p<0.05).[Conclusion]The changes of different vegetation types and soil layers cause significant changes in soil physical and chemical properties,and then regulate the changes and distribution of soil enzyme activities.Soil total nitrogen and organic carbon contents are the key factors affecting soil enzyme activities,and can better explain the distribution and change characteristics of soil enzyme activities.关键词
盐碱地/植被类型/理化性质/土壤酶活性Key words
saline-alkali land/vegetation type/physicochemical properties/soil enzyme activities分类
农业科技引用本文复制引用
马大卫,马彦军,郭咏淳,曾雨,马瑞,祝建刚..河西走廊盐碱地4种典型植被类型土壤理化性质和酶活性特征[J].水土保持学报,2025,39(2):102-110,9.基金项目
甘肃省高校产业支撑计划项目(2023CYZC-46) （2023CYZC-46）
甘肃省白银市景泰县盐碱地综合利用试点项目(JTYJDSDXM-SG-02) （JTYJDSDXM-SG-02）
甘肃省自然科学基金项目(24JRRG016) （24JRRG016）
国家自然科学基金项目(31760244,31060215) （31760244,31060215）
