外源硫添加对草甸草原土壤磷组分的影响  

Effects of Sulfur Addition on Soil Phosphorus Fractions in a Meadow Steppe

作　　者：张玉革[1] 王金环 刘贺永[2] 李天鹏 刘梦霖 王志瑞 冯雪[2] 姜勇[2,3] ZHANG Yuge;WANG Jinhuan;LIU Heyong;LI Tianpeng;LIU Menglin;WANG Zhirui;FENG Xue;JIANG Yong(Key Laboratory of Regional Pollution Environment and Ecological Restoration of Ministry of Education,Shenyang University,Shenyang 110044,China;Erguna Forest-Steppe Ecotone Ecosystem Research Station,Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016,China;School of Life Sciences,Hebei University,Baoding 071002,China)

机构地区：[1]沈阳大学、区域污染环境生态修复教育部重点实验室,辽宁沈阳110044 [2]中国科学院沈阳应用生态研究所、额尔古纳森林草原过渡带生态系统研究站,辽宁沈阳110016 [3]河北大学生命科学学院,河北保定071002

出　　处：《沈阳大学学报（自然科学版）》2023年第2期99-107,115,共10页Journal of Shenyang University：Natural Science

基　　金：国家自然科学基金资助项目(32101320,31870441)。

摘　　要：依托中国科学院额尔古纳森林草原过渡带生态系统研究站硫添加(0、1、2、5、10、15、20、50 g·m^(-2)·a^(-1))试验平台,分析了表土磷组分的变化动态,测定了土壤无机磷组分(Ca_(2)-P、Ca8-P、Al-P、Fe-P、Ca_(10)-P、O-P)和有机磷组分(按照其活性由大到小依次为活性有机磷、中等活性有机磷、中稳性有机磷、高稳性有机磷),研究了外源硫添加对草原土壤磷组分的影响。结果表明:随硫添加量的增加,土壤Al-P和Ca8-P质量分数显著增加,土壤Ca_(2)-P和Ca_(10)-P质量分数显著降低,硫添加降低土壤pH值,促进了易溶性无机磷(Ca_(2)-P)的溶解以及难溶性无机磷(Ca_(10)-P)向中等活性无机磷(Al-P、Ca8-P)的转化。随硫添加量的增加,土壤的活性、中等活性及高稳性有机磷质量分数降低,而中稳性有机磷质量分数增加,表明高量硫添加有利于中稳性有机磷的积累。硫添加增加了土壤有效磷质量分数,表明由硫添加诱导的土壤酸化可提高土壤磷的有效性。Based on a field experiment with S addition(0、1、2、5、10、15、20、50 g·m^(-2)·a^(-1))in Inner Mongolia Grassland Ecosystem Research Station of Chinese Academy of Sciences.The changes of P fractions in the topsoil were examined and the effects of exogenous S addition on grassland soil P fractions were studied.Soil inorganic P fractions include Ca_(2)-P、Ca 8-P、Al-P、Fe-P、Ca_(10)-P、O-P and soil organic P fractions include labile organic P,moderate-labile organic P,moderate-stable organic P,and high-stable organic P.Results showed that S addition significantly increased the mass fraction of soil Al-P and Ca 8-P,but decreased the mass fraction of soil Ca_(2)-P and Ca_(10)-P.S addition promoted the dissolution of soluble inorganic P(Ca_(2)-P)and the transformation of insoluble inorganic P(Ca_(10)-P)to moderate activity inorganic P(Al-P,Ca 8-P)by reducing soil pH.S addition decreased the mass fraction of soil labile,moderate-labile and high-stable organic P,but increased the mass fraction of soil moderate-stable organic P.This suggested that S addition accelerated the accumulation of moderate-stable organic P.S addition significantly increased the mass fraction of soil Olsen-P,suggested that S addition induced soil acidification improved soil P availability.

关 键 词：硫添加 土壤酸化 无机磷组分 有机磷组分 土壤有效磷 

分 类 号：S812.2[农业科学—草业科学]