湛江市沿海至内陆土壤质地地带性规律分析

选取湛江市东部沿海到内陆作为实验区,从沿海到内陆每隔1km采集一次土壤样品.于实验室内利用甲种比重计法测定所采集土样的物理性黏粒的百分比含量,按卡庆斯基制确定其对应的土壤质地类型,并使用GIS软件绘制采样区质地分布地图.结合统计软件对湛江市从沿海到内陆采集土壤样本进行定性化与定量化的分析.确定了该研究区内的耕地所属的土壤质地类型以及土壤质地空间分布特征,并得出两点结论:(1)湛江市从沿海到内陆,随着与海洋距离的增加,土壤中的物理性黏粒并没有表现出明显的变化趋势.在该地区,土壤质地与离海距离之间无显著的相关关系.(2)湛江沿海地区土壤质地类型主要受到人类耕作方式和施肥的制约,以及地形分布的影响.在水田、低洼处与河湖水库岸边的耕地其物理性黏粒占比相对较高.依据实验得出的各采样位置的土壤质地类型,提出合理的作物种植方案和土壤改良方法.

Analyses of the Patterns of Coastal Soil Textures in Zhanjiang City

In this study, soils of the eastern coastal regions of Zhanjiang City were studied with samples collected every 1 km from the coast to the inland regions. The percentage of clay in the collected soil samples was determined by the hydrometer method in the laboratory. Corresponding soil texture types were determined according to the Katschinski system, and subsequently a map of the sampling area was plotted using GIS software. At the same time, statistical software was used for qualitative and quantitative spatial analyses of the distribution of soil textures and types. Neither clay contents nor textures of the Zhanjiang City soils examined showed any geographic patterns in relation to distance from the sea.Soil textures in Zhanjiang coastal regions were found to be affected mainly by human tillage, and fertilization, and topographical influences. In the paddy fields, low-lying lands as well as along rivers and the shores of lakes and reservoirs,soils generally had high physical clay contents. Finally, according to the experimental results pertaining to soil textures of sampling locations, reasonable crop cultivation programs and soil improvement methods are recommended.