摘要
为探索和了解普安珍稀四球茶茶园土壤团聚体分布特征及其稳定性,采用野外调查和室内分析相结合的方法,通过测定普安四球茶茶园植茶年限为5年、15年、25年和40年土壤团聚体粒径组成,研究不同植茶年限下土壤团聚体分布特征及其稳定性。结果表明:(1)茶园主要以>2 mm粒级团聚体为主,占总体的40.92%~65.02%,在植茶15和25年时最大,植茶40年时最小。(2)2~5 mm粒级团聚体含量最多,<0.25 mm粒级团聚体含量最少。2~5 mm粒级团聚体与其他粒级团聚体呈显著差异(P<0.05)。(3)土壤团聚体平均重量直径(MWD)、几何平均直径(GMD)和R0.25的值均在植茶40年时有所减低;分形维数(D)在植茶40年时最大,土壤稳定性最差。综上,种植年限对茶园土壤团聚体分布及稳定性具有一定的影响,在植茶40年时稳定性较差,其抗蚀性、保肥性也相对较差,应适当施有机肥。
Distribution and stability of soil aggregates at the Camellia tetracocca tea plantations were surveyed in the field and studied in the laboratory.The size distribution and stability of the soil aggregates at areas with 5,15,25,and 40 years of the tea cultivation history were compared.It was found:(1)The soil aggregates at the plantations were mainly larger than 2mm in size.They accounted for 40.92%to 65.02%of the total at the differed sampling lots.The largest aggregates were in the areas that had grown the tea bushes for 15 or 25 years,while the smallest at the 40-year lots.(2)The 2~5 mm aggregates constituted the highest percentage of all sizes;whereas,those smaller than 0.25 mm the lowest.There was a significant difference between the 2~5 mm size group and others(P<0.05).And,(3)The mean weight diameter(MWD),geometric mean diameter(GMD)and R0.25 decreased after 40 years of planting.The fractal dimension rose with increasing time of cultivation and peaked on the least stable 40-year lots.The years of C.tetracocca cultivation seemed to affect the aggregate distribution and stability of the plantation soil.The greatest impact appeared when the tea bushes had grown on the land for 40 years.
作者
卢青
吴传美
刘鸿雁
黄春艳
杨谨铭
甘正刚
何季
LU Qing;WU Chuan-Mei;Liu Hong-yan;HUANG Chun-yan;YANG Jin-ming;GAN Zheng-gang;HE Ji(College of Agriculture, Guizhou University, Guiyang, Guzhou 550025, China;Tea Industry Development Center, Pu’an County, Guizhou Province, Southwest Guizhou, Guzhou 561500, China)
出处
《茶叶学报》
2021年第1期16-21,共6页
Acta Tea Sinica
基金
贵州省生物学一流学科建设项目(GNYL[2017]009)
贵州省科技计划项目(黔科合基础[2019]1106号)
贵州省科技计划项目(黔科合后补助[2020]3001)。
关键词
四球茶
土壤团聚体
植茶年限
稳定性
Camellia tetracocca
soil aggregates
tea-planting years
stability
作者简介
卢青(1994-),女,硕士研究生,主要从事茶园土壤的研究,E-mail:1336213189@qq.com;通讯作者:何季(1986-),女,博士,讲师,主要从事农业资源与环境方面研究,E-mail:heji15@163.com。
