摘要
以苏打盐碱土为研究对象,通过室内培养方法,研究含腐植酸褐煤对苏打盐碱土持水特性的影响,并对土壤持水特性指标进行相关和回归分析。结果显示:施用褐煤处理土壤饱和持水量、毛管持水量、田间持水量、毛管孔隙度、非毛管孔隙度和总孔隙度均显著高于CK处理(P<0.05),且均随着褐煤用量的增加呈升高趋势,但在褐煤用量较低时(<25%)非毛管孔隙度变化不显著。持水量与孔隙度呈极显著正相关,与容重、紧实度均呈极显著负相关(P<0.01)。饱和持水量、毛管持水量、田间持水量与毛管孔隙度相关系数分别为0.972、0.972、0.965,与非毛管孔隙度相关系数分别为0.697、0.691、0.672,与容重相关系数分别为-0.948、-0.948、-0.943,与紧实度相关系数分别为-0.693、-0.694、-0.677。饱和持水量、毛管持水量、田间持水量与容重、紧实度的回归趋势线均符合y=axb(a、b为常数)的幂函数线性关系,拟合优度均较好。综上所述,施用含腐植酸褐煤能够有效改善苏打盐碱土孔隙度,提高土壤持水量。利用持水量与容重、紧实度拟合方程可以间接估算相应持水量。
Taking soda saline-alkali soil as the research object,the effect of lignite containing humic acid on water holding characteristics of soda saline-alkali soil is studied by the indoor culture method,and the correlation and regression analysis of soil water holding characteris⁃tics are conducted.The results show that the soil saturated water holding capacity,capillary water holding capacity,field water holding ca⁃pacity,capillary porosity,non-capillary porosity and total porosity of lignite treatment are significantly higher than those of CK treatment(P<0.05),and all show an increasing trend with the increase in lignite dosage,but the non-capillary porosity does not change significantly when the lignite dosage is low(<25%).Water holding capacity is positively correlated with porosity and negatively correlated with bulk den⁃sity and compactness(P<0.01).The correlation coefficients of saturated water holding capacity,capillary water holding capacity and field water holding capacity with capillary porosity are 0.972,0.972 and 0.965 respectively,with non-capillary porosity are 0.697,0.691 and 0.672 respectively,with bulk density are-0.948,-0.948 and-0.943 respectively,and with compactness are-0.693,-0.694 and-0.677 respectively.The regression trend lines between soil water holding capacity and bulk density,and between soil water holding capacity and compactness both conform to the power function linear relationship of y=axb(a and b were constants),and the goodness of fit is good.Inconclusion,the application of lignite containing humic acid can effectively improve the porosity of soda saline-alkali soil and improve soil water holding capacity.The corresponding water holding capacity can be estimated indirectly by using the fitting equation between soil water holding capacity and bulk density,and between soil water holding capacity and compactness.
作者
顾鑫
任翠梅
张宏宇
王丽娜
杨丽
李娜
韩墨
GU Xin;REN Cui-mei;ZHANG Hong-yu;WANG Li-na;YANG Li;LI Na;HAN Mo(Daqing Branches of Heilongjiang Academy of Agricultural Sciences,Daqing 163316,Heilongjiang Province,China)
出处
《中国农村水利水电》
北大核心
2023年第5期141-145,共5页
China Rural Water and Hydropower
基金
黑龙江省农业科学院大庆分院青年人才培养项目(QN2022A01)。
关键词
含腐植酸褐煤
苏打盐碱土
土壤持水量
土壤孔隙度
回归分析
lignite containing humic acid
soda saline-alkali soil
soil water holding capacity
soil porosity
regression analysis
