摘要
【目的】基于广西扶绥县亚热带典型丘陵区,探究1980—2020年间耕地土壤pH的时空变异及其主要驱动因素,为提高我国耕地质量、提升作物产量和实现土地可持续利用提供理论依据。【方法】基于1980年广西扶绥县第二次土壤普查数据和2020年耕地土壤监测数据,分析坡度、海拔、土壤类型、成土母质和土壤有机质含量对耕地土壤pH变化的影响,利用方差分析和回归分析法探究影响其土壤pH变化的主要驱动因素。【结果】与1980年相比,2020年扶绥县西部地区渠旧镇和渠黎镇的立地条件较差,其耕地土壤酸化趋势明显,pH分别下降1.10和0.70,从中性向酸性转变;不同土壤类型中赤红壤的pH变幅最大,平均下降0.60;不同母质中第四纪红土和河流冲积物的土壤pH变异性最强,变幅为0.40。线性回归分析结果表明,坡度和海拔与耕地土壤pH呈极显著负相关(P<0.01,下同),有机质含量与耕地土壤pH呈极显著正相关。方差分析和回归分析结果表明,海拔、坡度和有机质含量是影响耕地土壤pH的重要因素,能分别独立解释21.5%、7.3%和3.7%耕地土壤pH的空间变异,说明海拔是造成土壤pH空间差异的主要因素。【结论】1980—2020年期间,广西扶绥县的耕地土壤pH总体上呈快速下降趋势,其中,赤红壤的pH降幅最大,第四纪红土和河流冲积物土壤pH的空间变异最强;海拔是影响广西扶绥县耕地土壤pH变化的主要因素,须通过增施有机肥改善土壤性状,进而有效调控土壤pH。
【Objective】Based on the typical subtropical hilly region of Fusui county, Guangxi, the temporal and spatial variation of cultivated soil pH and its main driving factors from 1980 to 2020 were investigated, which provided theoretical basis for improving the quality of cultivated land, improving crop yield and realizing sustainable land use in China.【Method】Based on the second soil survey in 1980 and cultivated land soil monitoring data in 2020 in Fusui county, Guangxi, the effects of slope, elevation, soil type, soil parent material and organic content on the change of cultivated land soil pH were analyzed, and the main driving factors influencing the change of cultivated land soil pH were explored by using variance analysis and regression analysis. 【Result】Compared with 1980,the site conditions of Qujiu town and Quli town in the western part of Fusui county were worse in 2020,and the soil acidification trend of cultivated land was obvious. The pH value decreased by 1.1 and 0.7,respectively, and changed from neutral to acidic. Among different soil types, the pH of lateritic soil decreased by 0.6 on average, and the variation was the largest. Among different parent materials, quaternary red earth and river alluvial materia had the strongest pH variability, with a variation range of 0.4. The results of linear regression analysis showed that slope and elevation were significantly negatively correlated with soil pH(P<0.01,the same as below),and organic matter content was significantly positively correlated with soil pH. The results of ANOVA and regression analysis showed that elevation, slope and organic content were the important factors affecting soil pH,and could independently explain the spatial variation of soil pH in 21.5%,7.3% and 3.7% of cultivated land, respectively. Therefore, it could be concluded that elevation was the main factor causing the spatial difference of soil pH.【Conclusion】From 1980 to 2020,the pH of cultivated soil in Fusui county of Guangxi decreased rapidly on the whole. Among them, the pH of lateritic soil decreased the most, and the spatial variation of soil pH of quaternary laterite and fluvial alluvial soil was the strongest. Elevation was the main factor affecting the change of soil pH. Therefore, it was necessary to improve soil properties by increasing organic fertilizer,so as to effectively regulate soil pH.
作者
明雪
康振威
黄智刚
MING Xue;KANG Zhen-wei;HUANG Zhi-gang(College of Agriculture,Guangxi University,Nanning 530004,China)
出处
《西南农业学报》
CSCD
北大核心
2022年第1期217-225,共9页
Southwest China Journal of Agricultural Sciences
基金
国家自然科学基金项目(41967006)
广西科技重大专项(桂科AA17204078)。
关键词
土壤PH
时空变异
驱动因素
回归分析
广西扶绥县
Soil pH
Temporal and spatial variation
Driving factors
Regression analysis
Fusui county
Guangxi
