SCIENTIA GEOGRAPHICA SINICA ›› 2014, Vol. 34 ›› Issue (3): 377-384.doi: 10.13249/j.cnki.sgs.2014.03.377

• Orginal Article • Previous Articles    

Effects of Different Tillage Methods on Spatial Distribution of Heavy Metals in Roadside Soils: A Case Study of Kaifeng Section Along the National Highway 310 in Huanghuai Plain

Zhi-qi TONG(), Tai-zheng CHEN, Hai-jing DUAN, Lei GU, Jian-hua MA()   

  1. Henan Open Laboratory for Key Subjects of Environmental Change and Water-Soil Pollution Control,Institute of Natural Resources and Environment, Henan University, Kaifeng, Henan 475004, China
  • Received:2013-03-04 Revised:2013-05-06 Online:2014-03-10 Published:2013-06-13

Abstract:

Two soil sampling transects in Xinghuaying and Duliang on Kaifeng section along the National Highway 310 were chosen to investigate effects of upland-upland rotation and paddy-upland rotation on spatial distribution of heavy metals in roadside soils. Five sampling sub-transects of 150 m were designed to be perpendicular to the road within 100 m on both sides of the highway. On each sub-transect, mixed topsoil samples (0-15 cm) were collected at 10 m intervals from the roadbed to the outside end. The total samples of 324 were collected, then, the concentrations of Pb, Cu, Ni, Cr, Cd and Zn in soils were detected by the inductively coupled plasma mass spectrometry (ICP-MS) respectively according to the recommended standard method. The spatial distribution of heavy metals concentrations in roadside soils was discussed by Universal Kriging Interpolation model. The results show that the different tillage methods have great effects on spatial distribution of heavy metals in roadside soils. The distribution patterns of metal concentrations are not strips parallel to the road in paddy-upland rotation field on Duliang Transect (DT), because the water in rice field changes pH, Eh of soils, and then accelerates the migration of soil heavy metals when the rice is grown. In contrast, the distribution patterns of metal concentrations in upland-upland rotation field on Xinghuaying Transect (XT) are strips parallel to the highway. The concentrations of Cr and Cu decrease exponentially with the distance from the roadbed, however, the concentrations of Cd, Pb, Ni and Zn reveal a skew distribution with the distance, which increase firstly, reach their highest values at 30 m or 50 m away from the roadbed, and then decrease gradually to the control values.

Key words: roadside soils, heavy metals, spatial distribution, tillage methods, Huanghuai Plain

CLC Number: 

  • X53