School of Geomatics and Marine Information, Huaihai Institute of Technology, Lianyungang, 222005, China.
Jiangsu Coastal Zone Environment Research Institute, Lianyungang, 222005, Jiangsu, China.
Environ Monit Assess. 2019 Mar 20;191(4):230. doi: 10.1007/s10661-019-7366-7.
Information about the soil quality of different land-use types and topographies is essential for the sustainable development, utilization, and protection of soil resource in coastal areas. In this study, representative topsoil samples were collected from Liandao Island, China, and soil water content (SWC), soil bulk density (BD), total nitrogen (TN), soil organic matter (SOM), ammonium nitrogen (NH-N), nitrate nitrogen (NO-N), available phosphorus (AP), available potassium (AK), soil salt content (SSC), and pH were recorded. The suitable minimum soil data set (MDS) was computed by principal component analysis (PCA) and the soil quality index (SQI) was then determined. The spatial distribution of the SQI was analyzed using ordinary kriging interpolation. The effects of topographical parameters (digital elevation model [DEM], slope, and aspect) and land-use types (vegetation [V], water resource conservancy land [WRC], sandy land [SL], unused land [UL], and built-up land [BL]) on SQI were then analyzed in detail. The parameters included in the MDS were TN, pH, and BD, which together accounted for 84.371% of the variation in soil quality. The SQI varied from 0.189 to 0.772 in the study area. The correlation coefficients between SQI and DEM, slope, and aspect were 0.498, 0.294, and 0.137, respectively (p < 0.01). The highest SQI score was found at an elevation of 110 m, with a slope of 68.2° and an aspect of 246.6, in the vegetation land-use type. Soil quality differed significantly (p = 0.0000) among the land-use types, with the following ranking: V > UL > SL > BL. Our results provide land managers with an important reference for the development, utilization, and protection of soil resource in coastal zones such as Liandao Island, China.
关于不同土地利用类型和地形的土壤质量信息，对于沿海地区土壤资源的可持续开发、利用和保护至关重要。本研究在中国列岛采集了有代表性的表层土壤样本，记录了土壤含水量（SWC）、土壤容重（BD）、总氮（TN）、土壤有机质（SOM）、铵态氮（NH-N）、硝态氮（NO-N）、有效磷（AP）、速效钾（AK）、土壤盐分含量（SSC）和 pH 值。通过主成分分析（PCA）计算了合适的最小土壤数据集（MDS），然后确定了土壤质量指数（SQI）。使用普通克里金插值法分析了 SQI 的空间分布。然后详细分析了地形参数（数字高程模型 [DEM]、坡度和方位）和土地利用类型（植被 [V]、水资源保护用地 [WRC]、沙地 [SL]、未利用地 [UL]和建设用地 [BL]）对 SQI 的影响。MDS 中包含的参数是 TN、pH 和 BD，它们共同占土壤质量变化的 84.371%。研究区 SQI 从 0.189 到 0.772 不等。SQI 与 DEM、坡度和方位的相关系数分别为 0.498、0.294 和 0.137（p<0.01）。植被土地利用类型中，海拔 110 米、坡度 68.2°和方位 246.6°处的 SQI 得分最高。不同土地利用类型之间的土壤质量差异显著（p=0.0000），排序为：V>UL>SL>BL。我们的研究结果为土地管理者提供了重要参考，可用于中国列岛等沿海地区的土壤资源开发、利用和保护。
