磷在褐土不同发生层的吸附解吸特征  

Characteristics of phosphorus adsorption and desorption in different soil pedogenic horizons of cinnamon soil region

作　　者：霍晓兰 马琳杰 李丽君 刘平 惠薇 马琦琦 HUO Xiao-lan;MA Lin-jie;LI Li-jun;LIU Ping;HUI Wei;MA Qi-qi(College of Resources and Environment,Shanxi Agricultural University/Provincial Key Laboratory of Soil Environment and Nutrient Resources,Taiyuan Shanxi 030031;Faculty of Life Sciences,Shanxi University,Taiyuan Shanxi 030006)

机构地区：[1]山西农业大学资源环境学院/山西省土壤环境与养分资源重点实验室,山西太原030031 [2]山西大学生命科学学院,山西太原030006

出　　处：《中国土壤与肥料》2024年第12期52-58,共7页Soil and Fertilizer Sciences in China

基　　金：山西农业大学科技创新提升工程(CXGC2023029);山西省重点研发计划项目(202102140601010-3);科技基础资源调查专项(2021FY100501);山西农业大学横向科技项目(2023HX07);国家重点研发计划项目(2016YFD0800105-5)。

摘　　要：为了探究磷在褐土不同发生层土壤的吸附解吸特征及其影响机制,以山西省典型石灰性褐土耕层、淋溶层、钙积层、黏化层和母质层为研究对象,通过添加不同浓度磷到土壤发生层,测定土壤磷的吸附解吸值,采用Langmuir方程拟合各发生层对磷的吸附曲线,计算相关参数并分析其与土壤性质的相关性。结果表明:(1)不同发生层土壤磷吸附能力为钙积层>黏化层>母质层>耕层>淋溶层,解吸能力则为淋溶层>母质层>耕层>黏化层>钙积层。(2)Langmuir等温吸附方程能很好地拟合5种发生层土壤对磷的吸附曲线(R^(2)=0.9702~0.9980)。钙积层最大吸附磷量(Q_(m))最大,为526.32 mg/kg;黏化层吸附常数(K)和最大吸附缓冲容量(MBC)最高,分别为0.24和78.74 mg/kg;淋溶层Q_(m)为232.56 mg/kg,K值为0.04,MBC值为10.37 mg/kg,且均为最小;耕层拥有最大的吸附饱和度(DPS)(4.34%),存在磷素淋失风险。(3)黏粒含量与土壤Q_(m)呈显著正相关,与磷DPS呈显著负相关;磷DPS还与有效磷含量呈显著正相关;有机质含量与土壤吸附结合能呈显著负相关。研究表明,褐土区不同发生层土壤对磷的吸附解吸特征均不相同,且各吸附参数与土壤性质的某些指标有明显关系,耕层磷素淋失风险较大应重点关注。The isotherm adsorption and desorption test using the typical pedogenic horizons of cinnamon soil(cultivation horizon,leaching horizon,calcic horizon,argic horizon,and parent material)of Shanxi Province as the research object was adopted.The adsorption and desorption characteristics of soil phosphorus in different pedogenic horizons were studied through the adsorption and desorption values of phosphorus,the fitting curve of Langmuir equation and the correlation between the relevant parameters and soil properties.The results showed that:(1)Phosphorus adsorption capacity of different soil pedogenic horizons was calcic horizon>argic horizon>parent material>cultivation horizon>leaching horizon,and desorption capacity was leaching horizon>parent material>cultivation horizon>argic horizon>calcic horizon.The calcic horizon had the highest phosphorus fixation capacity and the lowest desorption rate.The desorption capacity and desorption rate of the leaching horizon were the highest.(2)There was a good fitness between the phosphorus adsorption curve and Langmuir equation(R^(2)=0.9702-0.9980).The maximum phosphorus adsorption amount(Q_(m))of calcic horizon was 526.32 mg/kg.The adsorption constant(K)and maximum adsorption buffer capacity(MBC)values of the argic horizon were 0.24 and 78.74 mg/kg,respectively.The Q_(m),K and MBC values of the leaching horizon were 232.56 mg/kg,0.04 and 10.37 mg/kg,and they were all the minimum.The cultivation horizon had the highest adsorption saturation(DPS)(4.34%),so it was at risk of phosphorus leaching.(3)The clay content was significantly positively correlated with the Q_(m)and negatively correlated with the phosphorus DPS.The phosphoras DPS was significantly positively correlated with available phosphorus.The organic matter content was negatively correlated with soil adsorption binding energy.The results showed that characteristics of phosphorus adsorption and desorption in different soil pedogenic horizons of cinnamon soil region were different,and had obvious relationship with soil pr

关 键 词：褐土 发生层 磷 吸附解吸 土壤性质 

分 类 号：S15[农业科学—土壤学]