摘要
探讨不同沙化程度对草地土壤无机磷(P)组分的影响,明确土壤无机P组分的变化特征。以辽西北沙化草地为研究对象,设置6个加沙水平[0%(对照)、10%、30%、50%、70%],测定了不同加沙水平下,土壤化学性质[pH、浸提态铁、锰(DTPA-Fe、DTPA-Mn)、交换性Ca^(2+)、交换性Mg^(2+)]、土壤无机磷组分[磷酸二钙(Ca_(2)-P)、磷酸八钙(Ca_(8)-P)、磷酸铝(Al-P)、磷酸铁(Fe-P)、磷酸十钙(Ca_(10)-P)、闭蓄态磷(O-P)],以及土壤有效磷的变化。研究表明,加沙处理增加了土壤pH,但显著降低了土壤DTPA-Fe、DTPA-Mn、交换性Ca^(2+)和交换性Mg^(2+)含量。不同加沙处理的土壤Ca_(2)-P、Fe-P、O-P含量分别比对照处理降低0.6%~26.6%、0.2%~16.3%、6.6%~13.3%;随着加沙比例的增加,土壤Ca_(8)-P和Ca_(10)-P含量显著增加,与对照处理相比分别增加0.2~7.6和8.8~59.9 mg·kg^(-1);土壤有效磷含量随加沙量的增加显著降低。土壤有效磷与土壤Ca_(2)-P显著正相关,与Ca_(8)-P和Ca_(10)-P显著负相关。随着沙化程度的加剧,溶解性较高的土壤Ca_(2)-P含量显著降低,而溶解性较低的Ca_(8)-P和Ca_(10)-P含量显著升高,是导致土壤有效磷含量降低的关键因子;研究结果揭示了沙化草地土壤无机磷组分的转化过程及土壤有效磷降低的关键调控因子。
The effects of different degrees of desertification on the inorganic phosphorus(P)fractions of grassland soils were investigated,and the change characteristics of soil inorganic P fractions were examined.The desertified grasslands in the northwestern Liaoning province was employed as the research object and six sand addition levels[0%(control),10%,30%,50%,70%]were established to ascertain the changes in soil chemical properties(pH,DTPA-Fe and Mn,exchangeable Ca^(2+)and Mg^(2+)),soil inorganic phosphorus fractions[dicalcium phosphate(Ca_(2)-P),octacalcium phosphate(Ca_(8)-P),aluminum-bound phosphate(Al-P),iron-bound phosphate(Fe-P),dicalcium phosphate(Ca_(10)-P),and occluded phosphate(O-P)],and soil available P under different sand addition levels.The results showed that sand addition increased soil pH,but significantly reduced soil DTPA-Fe,DTPA-Mn,exchangeable Ca^(2+),and exchangeable Mg^(2+)contents.Compared to the control,the contents of soil Ca_(2)-P,Fe-P,and O-P were reduced by 0.6%-26.6%,0.2%-16.3%and 6.6%-13.3%,as the percentage of sand in the soil increased,the contents of Ca_(8)-P and Ca_(10)-P were significantly increased by 0.2-7.6 mg·kg^(-1)and 8.8-59.9 mg·kg^(-1),respectively.Soil available P exhibited a marked decline with increasing sand addition.Correlation analysis revealed a significant positive relationship between soil available P and Ca_(2)-P,and a significant negative relationship with Ca_(8)-P and Ca_(10)-P.The intensified desertification reduced the highly soluble Ca_(2)-P content while increasing the less soluble Ca_(8)-P and Ca_(10)-P fractions,which were identified as key factors driving the decline in soil available P.The results of the study revealed the transformation process of soil inorganic phosphorus fractions in desertified grasslands and the key regulatory factors for the decrease of soil available phosphorus.
作者
廖垠鸿
刘贺永
李秋桦
王嘉强
孙树林
吕林有
姜勇
LIAO Yin-hong;LIU He-yong;LI Qiu-hua;WANG Jia-qiang;SUN Shu-lin;LV Lin-you;JIANG Yong(College of Life Sciences,Hebei University,Baoding Hebei 071002;Tangshan Ecological and Environmental Bureau Kaiping District Branch,Tangshan Hebei 063021;Institute of Sand Land Management and Utilization,Fuxin Liaoning 123000)
出处
《中国土壤与肥料》
北大核心
2025年第11期9-15,共7页
Soil and Fertilizer Sciences in China
基金
天津市自然科学基金项目(23JCQNJC01140)
河北省教育厅青年拔尖人才项目(BJK2024136)。
关键词
草地
土壤沙化
无机磷组分
有效磷
grassland
desertification
inorganic phosphorus fractions
available phosphorus
