摘要
【目的】研究杉木木荷混交对土壤肥力的影响。【方法】以23年生杉木(Cunninghamia lanceolata)-木荷(Schima superba)混交林、杉木纯林和木荷纯林3种林分类型为研究对象,分析了不同土层(表层:0~20 cm、下层:20~50 cm)土壤pH、土壤养分(有机碳、全氮、速效氮、有效磷、速效钾)和土壤酶活性(蛋白酶、蔗糖酶、过氧化氢酶、酸性磷酸酶、脲酶)的变化及其之间的关系。【结果】(1)3种林分类型土壤养分因子和酶活性含量基本呈现明显的“表聚”现象。0~20 cm土层,混交林的土壤全氮、速效氮、速效钾含量均显著高于杉木纯林(P<0.05),分别比纯林提高66.67%、44.32%和8.25%;混交林土壤中脲酶活性较杉木纯林显著提高1.99%。(2)20~50 cm土层,混交林的土壤全氮含量显著高于杉木纯林,比纯林提高64.86%;混交林土壤脲酶活性相比杉木纯林显著提高18.58%(P<0.05),蛋白酶、蔗糖酶和酸性磷酸酶活性分别增加了50%、14.42%和4.92%。(3)相关分析显示,土壤蛋白酶、蔗糖酶、酸性磷酸酶活性与土壤有机碳、全氮和有效磷均呈极显著正相关(P<0.01)。【结论】整体来看,杉木木荷混交林不仅能显著提高表层土壤养分还能显著提升下层土壤全氮的含量,说明杉木木荷混交林营林模式是缓解杉木人工林土壤肥力衰退的有效措施,且土壤酶活性与土壤养分之间关系密切,在提升土壤肥力方面发挥重要作用。研究加深了对杉阔混交林造林缓解土壤退化机理的认识,为杉阔混交林营造和杉木可持续经营提供了科学依据。
[Objective]This study aims to investigate the effects of mixed plantation of Cunninghamia lanceolata and Schima superba on soil fertility.[Method]The changes and relationship between soil pH,soil nutrients(organic carbon,total nitrogen,available nitrogen,available phosphorus,available potassium)and soil enzyme activities(protease,sucrase,catalase,acid phosphatase,urease)in different soil layers(surface layer:0-20 cm,subsurface layer:20-50 cm)of 23-year Cunninghamia lanceolata and Schima superba mixed forest,pure Cunninghamia lanceolata plantation,and pure Schima superba plantation were explored.[Result]The results showed that:(1)Soil nutrient properties and enzyme activities of three types of forests showed obvious“surface aggregation”trend.In the 0-20 cm soil layer,the contents of soil TN,AN,and AK in the mixed plantation were significantly higher than in pure Cunninghamia lanceolata plantation(P<0.05),and were 66.67%,44.32%,and 8.25%higher than that in pure forest respectively.Moreover,soil urease activities in the surface soil layer of mixed plantation increased by 1.99%respectively as compared with pure Cunninghamia lanceolata plantation;(2)In the 20-50 cm soil layer,soil TN content in the mixed forest was significantly higher than that of the pure Cunninghamia lanceolata plantation and 64.86%higher than that of the pure plantation(P<0.05).Additionally,soil sucrase and acid phosphatase activities in the mixed plantation increased by 50%,14.42%,and 4.92%in the pure Cunninghamia lanceolata plantation.(3)Correlation analysis showed that soil protease,sucrase and acid phosphatase activities were significantly positively correlated with soil SOC,AN and AP respectively(P<0.01).[Conclusion]Overall,the mixed forest of Cunninghamia lanceolata and Schima superba can effectively improve soil fertility not only in the surface soil but also the TN content in the subsoil.The results demonstrated that the mixed forest afforestation is an effective measure to alleviate the soil fertility decline of pure Cunninghamia lanc
作者
孙沉沉
王自强
潘畅
宋雅琦
俞元春
SUN Chenchen;WANG Ziqiang;PAN Chang;SONG Yaqi;YU Yuanchun(College of Biology and the Environment,Co-Innovation Center for the Sustainable Forestry in Southern China,Nanjing Forestry University,Nanjing 210037,China)
出处
《江西农业大学学报》
CAS
CSCD
北大核心
2023年第3期517-525,共9页
Acta Agriculturae Universitatis Jiangxiensis
基金
国家“十四五”重点研发计划项目(2021YFD2201303)
江苏高校优势学科建设工程资助项目(PAPD)。
关键词
杉木
木荷
混交林
土壤养分
土壤酶活性
Cunninghamia lanceolate
Schima superba
mixed forest
soil nutrients
soil enzyme activity
