土壤2024，Vol.56Issue(6)：1222-1230,9.DOI:10.13758/j.cnki.tr.2024.06.010
盐分梯度对土壤中不同磷素形态转化的影响
Effects of Salt Gradient on Transformation of Different Phosphorus Forms
摘要
Abstract
In order to explore the difference and transformation of soil phosphorus forms under different salt gradients,no-salinized soil was taken from the dry farmland in Pingluo,Ningxia as the research object,and indoor culture experiment was conducted,in which three salt gradients of non-salinization(N),mild salinization(L)and moderate salinization(M)were set up by adding NaCl and Na2SO4 in equal amounts.The effects of salt gradient on soil phosphorus forms and enzyme activities were analyzed under two treatments of no phosphorus fertilizer(S)and KH2PO4(P).The results showed that:1)the higher soil salt content,the lower soil available phosphorus content.2)Soil organic phosphorus content increased with the extension of culture time without phosphorus fertilizer added.In addition to phosphorus fertilizer added,soil organic phosphorus content decreased with the extension of culture time.Under each salt gradient,soil organic phosphorus content showed M＞L＞N.3)After 97 days of culture,inorganic phosphorus reservoirs in the three salinized soils without phosphorus fertilizer added were Ca10-P＞Ca8-P＞Fe-P＞O-P＞Al-P≈Ca2-P.With the increase of salt content,the contents of Ca10-P and O-P increased,while the contents of Fe-P and Al-P decreased under the treatments of adding phosphate fertilizer.4)Significant positive correlations were found between soil Al-P and alkaline phosphatase(ALP)activity in the treatments without adding phosphate fertilizer.While under the treatments of adding phosphate fertilizers,significant negative correlations were found between soil Ca10-P and O-P with ALP and phytase(PHY)activities,and significant positive correlations between soil Al-P and Fe-P with ALP and PHY activities(P＜0.05).From the perspective of the effect of salt on phosphorus form differences,this study provides a reference for exploring the transformation of soil phosphorus form under different salt gradients.关键词
盐分/土壤磷素形态/酶活性/盐渍化土壤Key words
Salt/Soil phosphorus form/Enzyme activity/Salinized soil分类
农业科技引用本文复制引用
李小林,高乾程,刘雨星,王相平,张俊华,姚荣江..盐分梯度对土壤中不同磷素形态转化的影响[J].土壤,2024,56(6):1222-1230,9.基金项目
国家重点研发计划课题(2021YFD1900602、2021YFC3201201)和宁夏科技创新领军人才计划项目(2022GKLRLX02)资助. （2021YFD1900602、2021YFC3201201）
