5种相思树和尾巨桉人工林土壤养分和酶活性特征  

Characteristics of Soil N utrient and Enzyme Activities in Plantations of Eucalypt us urophyll a×E.grandis and F ive Acacia Species

作　　者：周丽丽 李树斌 潘辉[1] 王万萍[2,3] 吴亚岚 郑茹萍 ZHOU Lili;LI Shubin;PAN Hui;WANG Wanping;WU Yalan;ZHENG Ruping(Institute of Oceanography,Minjiang University,Fuzhou 350108,China;Chinese fir Engineering Technology Research Cen ter,State Forestry and Grassland Administration,Fuzhou 350002,China;College of Forestry,Fujian Agriculture and Forestry University,Fuzhou 350002,China;College of Environment and S a fety E n gineering,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]闽江学院海洋研究院,福州350108 [2]国家林业和草原局杉木工程技术研究中心,福州350002 [3]福建农林大学林学院,福州350002 [4]福州大学环境与安全工程学院,福州350108

出　　处：《热带亚热带植物学报》2021年第5期483-493,共11页Journal of Tropical and Subtropical Botany

基　　金：福建省林业科技项目([2019]16);福建省自然科学基金项目(2018J05059)资助。

摘　　要：为揭示固氮树种土壤养分转化的酶学机制,对固氮树种[厚荚相思(Acacia crassicarpa)、黑木相思(A.melanoxylon)、卷荚相思(A.cincinnata)、大叶相思(A.auriculiformis)和马占相思(A.mangium)]及非固氮树种尾巨桉(Eucalyptus urophylla×E.grandis)人工林的土壤养分含量、酶活性及其相关性进行研究。结果表明,相思林40~60 cm土层的pH均高于尾巨桉林;5种相思林土壤各土层的TP、TK含量均低于尾巨桉林,而20~40 cm土层的TC、TN含量均高于尾巨桉林,黑木相思林和马占相思林各土层的有效养分均显著高于尾巨桉林(P<0.05)。0~10 cm土层中,相思林的土壤酸性磷酸酶和纤维素酶活性均高于尾巨桉林,大叶相思林的土壤脲酶、蔗糖酶、纤维素酶和芳基硫酸酯酶活性显著高于尾巨桉林(P<0.05),卷荚相思林的土壤脲酶、纤维素酶、几丁质酶和淀粉酶活性显著高于尾巨桉林(P<0.05)。相关分析结果表明,土壤脲酶、蔗糖酶和几丁质酶活性与AP显著负相关(P<0.05),蔗糖酶和纤维素酶活性与NH4+-N显著负相关(P<0.05),脲酶、纤维素酶、芳基硫酸酯酶与土壤TK显著负相关(P<0.05),几丁质酶活性与TN含量呈显著正相关(P<0.05),土壤淀粉酶活性与NH4+-N呈显著正相关(P<0.05),过氧化氢酶活性与土壤TK含量呈显著正相关。可见,与尾巨桉人工林相比,在我国南方退化山地引种相思树可提高土壤关键酶的活性,对土壤有效养分具有明显改良作用,有利于退化地土壤的生态修复及人工林长期生产力的维持。In order to reveal the enzymatic mechanism of soil nutrient transformation,the soil nutrient contents and enzyme activities in plantations,such as nitrogen-fixing tree species(Acacia crassicarpa,A.melanoxylon,A.cincinnata,A.auriculiformis,A.mangium)and non-nitrogen-fixing species(Eucalyptus urophylla×E.grandis)were studied,and their relationships were analyzed.The results showed that the pH in 40-60 cm soil of Acacia plantations were higher than that in E.urophylla×E.grandis plantation,which total P and K contents at all soil layers were lower than those in E.urophylla×E.grandis plantation,while total C and total N contents at 20-40 cm soil were high in Acacia plantations.Soil available nutrients contents were significantly higher in A.melanoxylon and A.mangium than those in E.urophylla×E.grandis plantation(P<0.05).Compared to E.urophyll a×E.grandis plantation,the acid phosphatase and cellulase activities at 0-10 cm soil layer wer e high in Acacia plantations,which the activities of soil urease,sucrase,cellulase and aryl sulfatase were the highest in A.auriculiformis plantation(P<0.05);the activities of soil urease,cellulose,c h itinase and amylase were the highest in A.cincinnata plantation(P<0.05).Correlation analysis revealed that the activities of soil urease,sucrase and c h itinase were significantly negative to soil AP(P<0.05);the activities of soil sucrase and cellulase were signifi-cantly negative to soil NH 4+-N;the activities of soil urease,cellulase and aryl sulfatase were significantly negative to soil TK;the activities of soil c h itinase were significantly positively to soil TN;the activities of soil amylase were significantly positively to soil NH 4+-N;the activities of soil c atalase were signifi cantly positively to soil TK.Therefore,compared to E.urophyll a×E.grandis plantation,the introduced Acacia species to soil degraded mountains in southern China could improve key soil enzyme activities and soil available nutrients,which was beneficial to the eco-restoration of degraded soil and the m

关 键 词：相思树 桉树 土壤退化 土壤养分 土壤酶 冗余分析 

分 类 号：S714[农业科学—林学]