Effects of Highway Forest Belts on Heavy Metals Pollution from Tail Gas of Vehicles Changes of soil enzyme activities in heavy metals polluted region: A case study in a wastewater-irrigated agricultural area near a smelter in Xinluo District of Longyan City, Fujian Province Research advance of soil heavy metals pollution in China Effects of heavy metals pollution on soil microbial communities metabolism and soil enzyme activities in coal mining area of Tongchuan, Shaanxi Province of Northwest China. The pollution monitoring index system of wheat at different growth stages under the stress of Cd,Cr and Pb Research Progress in the Remediation of Heavy Metal Contaminated Soils with Populus Sources and potential risk of heavy metals in roadside soils of Xi’an City. Pollution characteristics and potential ecological toxicity assessment of heavy metals in surface sediments of Xinglin Bay, Xiamen