1. College of Resources and Environment SciencesChina Agricultural University Beijing 100193 PR China
2. Beijing Key Laboratory of Farmland Soil Pollution Prevention and RemediationChina Agricultural University Beijing 100193 PR China
3. Key Laboratory of Agricultural Land QualityMinistry of Land and Resources of China Beijing 100193 PR China
4. National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment SciencesShandong Agricultural University Tai'an 271018 PR China