长期施肥下红壤旱地磷素有效性影响因子的冗余分析  

Redundancy analysis of influencing factors of phosphorus availability in red soil upland under long-term fertilization

作　　者：王蕾 王艳玲[1] 李欢 石嘉琦 周亦靖 WANG Lei;WANG Yan-ling;LI Huan;SHI Jia-qi;ZHOU Yi-jing(School of Applied Meteorology,Nanjing University of Information Science and Technology,Nanjing Jiangsu 210044)

机构地区：[1]南京信息工程大学应用气象学院,江苏南京210044

出　　处：《中国土壤与肥料》2021年第1期17-25,共9页Soil and Fertilizer Sciences in China

基　　金：国家自然科学基金项目(41571286)。

摘　　要：以长期施肥(1988~2014年)的红壤旱地为研究对象,以全磷(TP)、有效磷(Bray-P)为响应变量,土壤p H值、大小粒级团聚体组成比例(PSAi)、铁铝氧化物、阳离子交换量(CEC)、分形维数(D)等指标为解释变量,借助于冗余分析(RDA)方法探讨各指标变量与红壤旱地TP和Bray-P含量变化的相关关系。研究结果表明,长期施磷或配施猪粪均可显著增加红壤旱地TP和Bray-P含量,而配施作物秸秆无显著影响。冗余分析发现,土壤p H、CEC、D、铁铝氧化物含量及粒级为0.25~0.05、0.001~0.005与<0.005 mm的团聚体分布比例(PSA2、PSA4与PSA5)等土壤测试值是影响红壤旱地磷素有效性的主控因子,其中,p H和CEC的影响作用最大。可见,通过长期施肥改善土壤的酸性环境,提高土壤阳离子交换量,是提高红壤旱地磷素有效性的关键。In this study,taking red soil upland under long-term fertilization(1988~2014)as research materials,total phosphorus(TP)and available phosphorus(Bray-P)as response variables,soil pH,the particle size composition of aggregates(PSAi),iron and aluminum oxides,cation exchange capacity(CEC),fractal dimension(D)as explanatory variables,the correlation between index variables and the changes of TP and Bray-P content in red soil upland were discussed by means of redundancy analysis(RDA)method.The results showed that long-term application of phosphorus or combined application of pig manure significantly increased TP and Bray-P content in red soil upland,while the application of crop straw had no significant effect.RDA found that the main controlling factors affecting phosphorus availability in red soil upland were soil pH,CEC,D,iron and aluminum oxide content and the distribution ratio of aggregates with particle size of 0.25~0.05 mm(PSA2),0.001~0.005 mm(PSA4),and<0.005 mm(PSA5),among which pH and CEC played the most important roles.It can be seen that improving the acidic environment and increasing the cation exchange capacity of soil by long-term fertilization is the key to improve the phosphorus availability in red soil upland.

关 键 词：长期施肥 红壤旱地 土壤物理化学性质 磷素有效性 冗余分析 

分 类 号：S153.6[农业科学—土壤学]