Effects of Landscape Features on the Roadside Soil Heavy Metal Distribution in a Tropical Area in Southwest China

Abstract

Soil heavy metals along roadsides pose a great threat to ecosystems while their spatial variations and influencing factors still remain unclear in some regions, especially in tropical areas with complex landscape characteristics. Our study was carried out to determine how the land use, vegetation characteristics, topographical factors and distance to the road affect the soil heavy metal distribution. Taking Jinghong county in Yunnan Province, Southwest China as a case, soil samples were collected at different distances off roads and canonical correspondence analysis (CCA) methods were used to determine the relative importance of different factors. Our results showed that heavy metal sources were obtained mainly from the road, based on the principle component analysis (PCA) identification. There were no obvious trends of soil quality index (SQI) with distance to the road in natural soils, while SQI nutrients and SQI metals in farmlands had a decreasing and increasing trend, respectively, which could both be expressed by logarithm models. However, soil properties showed little differences for road levels while they showed significant differences under land use types. The CCA further showed that heavy metal variations in natural soils were jointly affected by distance, plant coverage, relative elevation and soil properties in decreasing order.

Sebaran Konsentrasi Logam Berat Di Lahan Pertanian Kabupaten Wonosobo

“…Sebaran logam berat dalam tanah bergantung pada proses geogenik, antropogenik, dan iklim. Beberapa studi menunjukkan bahwa sebaran logam berat juga dipengaruhi oleh beberapa faktor seperti topografi, tingkat lalu lintas, penggunaan lahan, jenis vegetasi, kemiringan lahan, jenis tanah, pH tanah, dan curah hujan (Dong et al, 2021;Rawat et al, 2019;Aflizar et al, 2018). Konsentrasi logam berat pada setiap lokasi tidak selalu tetap dan akan fluktuatif tergantung bagaimana pengelolaan lahan dalam budidaya pertanian dan sumber pencemar logam yang masuk pada lahan pertanian dan batuan (bahan induk) sebagai sumber logam itu sendiri.…”

Special Issue on Heavy Metals in the Environment—Causes and Consequences

“…Dong et al [12] have analyzed the impact of landscape structure on the propagation of heavy metal pollution related to road traffic in the tropical areas of south-eastern China. It has been found that the contamination level of soils used for agricultural purposes is impacted by the distance from roads, the type of land cover, topography, and soil properties.…”

Soil Health Evaluation of Farmland Based on Functional Soil Management—A Case Study of Yixing City, Jiangsu Province, China

“…These problems can exert dramatic influences on the level of SH, causing a decrease in crop yields, decline in agricultural product quality, reduction in biodiversity, and even human health hazard. In view of the external attributes or environmental factors that limit the sustainability of SH, the indicators of SH hazards for farmland, including the degree of soil salinization, depth of the barrier layer, degree of soil erosion, white pollution, pesticide residues, irrigation water pollution, heavy metals pollution, atmospheric pollution, degree of surface rock exposure, crop pollution, gravel content, soil acidification, soil compaction, flood disasters, and soil alkalization, were selected in the present study [61][62][63][64][65].…”