不同土地利用方式下南亚热带赤红壤酸化特征  

Acidification Characteristics of Lateritic Red Soil Under Different Land Use Types in Typical Subtropical Region

作　　者：文慧颖 吴华勇[1] 董岳 冯文娟 卢瑛[3] 胡月明[3] 张甘霖[1,2,4] WEN Huiying;WU Huayong;DONG Yue;FENG Wenjuan;LU Ying;HU Yueming;ZHANG Ganlin(State Key Laboratory of Soil and Sustainable Agriculture,Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008,China;University of Chinese Academy of Sciences,Beijing 100049,China;College of Natural Resources and Environment,South China Agricultural University,Guangzhou 510642,China;Key Laboratory of Watershed Geographic Sciences,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,China)

机构地区：[1]土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所),南京210008 [2]中国科学院大学,北京100049 [3]华南农业大学资源环境学院,广州510642 [4]中国科学院南京地理与湖泊研究所中国科学院流域地理学重点实验室,南京210008

出　　处：《土壤》2023年第2期372-378,共7页Soils

基　　金：国家自然科学基金面上项目(U1901601,41977003)资助。

摘　　要：土地利用方式是影响土壤酸化的重要因素,研究不同土地利用方式下赤红壤酸化特征可为缓解和治理赤红壤区土壤酸化提供依据。本研究采集了4种土地利用方式(菜地、果园、水田、林地)的赤红壤区土壤样品,测定了表层(0~20 cm)和表下层(20~40 cm)土壤的理化性状,结合田间调查和统计数据分析了不同土地利用方式下土壤酸化特征及成因。结果表明:果园表层土壤pH显著低于林地,果园表下层土壤pH显著低于水田和林地;菜地、果园土壤交换性Al^(3+)含量显著高于水田和林地;果园表层土壤的盐基饱和度与阳离子交换量均显著低于自然林地,菜地表下层土壤盐基饱和度显著低于水田;与水田和林地相比,菜地和果园的酸化更严重,酸缓冲能力更低。不同土地利用下施肥、复种指数以及耕作方式上的差异可能是造成气候与母质相似地区土壤酸化差异的主要原因。Land use type is an important factor affecting soil acidification.Study on the acidification characteristics and differences of lateritic red soil under different land use types is the premise of mitigating and controlling soil acidification in lateritic red soil region.In this study,four land use types(vegetable lands,orchards,paddy fields,woodlands)of lateritic red soil were selected,soil physical and chemical properties were measured at different depths(surface:0–20 cm;subsurface:20–40 cm),and then the acidification characteristics and causes of lateritic red soil under different land use types were analyzed with the combination of field investigation.The results show that pH of orchards is significantly lower than that of woodlands in the surface layer,and significantly lower than that of paddy fields and woodlands in the subsurface layer.Exchangeable Al^(3+)content is significantly higher in vegetable lands and orchards than those of paddy fields and woodlands.In surface layer,base saturation(BS)and CEC of orchards are significantly lower than those of woodlands.In subsurface layer,BS of paddy fields is significantly higher than that of vegetable lands(P<0.05).Compared with paddy fields and woodlands,vegetable lands and orchards have more serious acidification and worse acid buffering capacity.Differences in fertilization,multiple cropping index and tillage methods may be responsible for soil acidification under different land uses.

关 键 词：土壤酸化 土地利用方式 土壤PH 赤红壤 

分 类 号：S153[农业科学—土壤学]