5 different forests of Pinus massoniana , Schima superba , Liquidambar formosana , P. massoniana × S. superba , P. massoniana × L. formosana as the research object were set up to study the Cr, Cu and Zn content of degraded red soil region in subtropics. The soil heavy metal pollution degree was evaluated by national environmental quality standard (II class). The results showed that three soil metals of P. massoniana × S. superba were the highest, and the soil metals enrichment ability was strong. The order of single factor pollution index of metal elements was Cu (1.38) > Cr (0.81) > Zn (0.42), and moderately pollution, pollution warning and no pollution, respectively. There was n o signi ficant correlation between three soil heavy metals and soil total carbon (TC), total nitrogen (TN) and total phosphorus (TP). These results suggested that the accumulation of heavy metal elements was not derived from the parent material of soil. There was a significant positive correlation between the three metal elements which indicated that the sources of the three elements were similar. The structural equation model showed that the direct and indirect effects among the influencing factors ultimately affected the activity of heavy metals by cascade effects.
KeywordsSubtropical Forest TypeDegraded Red SoilHeavy MetalsPollution Evaluation
Shao, Y.Q., Zhao, J. and Yang, J. (2004) Distribution Characteristics of Soil Microbial Numbers in Grassland and Degraded Grassland. Journal of Desert Research, 24, 223-226.
Martin, J.A.R., Gutiérrez, C., Torrijos, M., et al. (2018) Wood and Bark of Pinus halepensis as Archives of Heavy Metal Pollution in the Mediterranean Region. Environmental Pollution, 239, 438-447. https://doi.org/10.1016/j.envpol.2018.04.036
Li, X.G., Kang, X.R., Cai, Z.Y., et al. (2019) Heavy Metal Tolerance, Accumulation and Distribution in Five Clones of Casuarina equisetifolia. Chinese Journal of Ecology, 38, 2094-2101.
Peng, H., Ma, J., Ma, Y.L., et al. (2019) Characteristics and Sources Identification of Heavy Metal Pollution in Agricultural Soils and Vegetables in Wuqing District, Tianjin City, China. Chinese Journal of Ecology, 38, 2102-2112.
Chen, X.W., Wong, J.T.F., Leung, A.O.W., et al. (2017) Comparison of Plant and Bacterial Communities between a Subtropical Landfill Topsoil 15 Years after Restoration and a Natural Area. Waste Management, 63, 49-57. https://doi.org/10.1016/j.wasman.2016.08.015
Aslam, S.N., Huber, C., Asimakopoulos, A.G., et al. (2019) Trace Elements and Polychlorinated Biphenyls (PCBs) in Terrestrial Compartments of Svalbard, Norwegian Arctic. Science of the Total Environment, 685, 1127-1138. https://doi.org/10.1016/j.scitotenv.2019.06.060
Brockerhoff, E.G., Jactel, H., Parrotta, J.A., et al. (2008) Plantation Forests and Biodiversity, Oxymoron or Opportunity. Biodiversity and Conservation, 17, 925-951. https://doi.org/10.1007/s10531-008-9380-x
Guo, Y., Cheng, R.M., Yang, S., et al. (2018) Temporal and Spatial Variation of Soil Heavy Metal Contents in Different Vegetation Types in the Three Gorges Reservoir Area. Chinese Journal of Ecology, 37, 2497-2504.
Richardson, J.B., Petrenko, C.L. and Friedland, A.J. (2017) Base Cations and Micronutrients in Forest Soils along Three Clear-Cut Chronosequences in the Northeastern United States. Nutrient Cycling in Agroecosystems, 109, 161-179. https://doi.org/10.1007/s10705-017-9876-4
Chu, C.H., She, Y.H., She, J.Y., et al. (2014) Spatial Distribution and Ecological Risk Assessment of Heavy Metals in Soil from Different Forests in Subtropics. Journal of Soil and Water Conservation, 28, 258-263.
Zhu, J., Huang, B., Sun, W.X., et al. (2007) Temporal-Spatial Variability and Its Influencing Factors of Available Trace Metals in Soils. Journal of Nanjing University (Natural Sciences), 43, 1-12.
Feng, P., Zhuang, Y.G., Tian, S.X., et al. (2018) Availability and Influencing Factors of Trace Elements in Humus Layer of Broad-Leaved Pinus korean Forest in Northeast China. Journal of Shenyang University (Natural Science), 30, 361-365.
Zhao, L.J., Xiao, H.L., Guo, T.W., et al. (2004) Spatial Variability of Trace Elements in the Desert Soil of Hexi, Gansu Province. Journal of Soil and Water Conservation, 18, 27-34.
Manoj, M., Sandra, H., Karim, C., et al. (2005) Water Regime of Metal-Contaminated Soil under Juvenile Forest Vegetation. Plant and Soil, 271, 227-241. https://doi.org/10.1007/s11104-004-2390-x
Haq, S.M., Rashid, I., Khuroo, A.A., et al. (2019) Anthropogenic Disturbances Alter Community Structure in the Forests of Kashmir Himalaya. Tropical Ecology, 60, 6-15. https://doi.org/10.1007/s42965-019-00001-8
Zhang, J.C., Zeng, F. and Zhu, L. (2004) “Memory” Effects of Heavy Metals on Forest Soils. Rural Ecological Environment, 20, 1-5.
Kuzyakova, I.F., Romanenkov, V.A. and Kuzyakov, Y.V. (2001) Geostatistics in Soil Agrochemical Studies. Eurasian Soil Science C/C of Pochvovedenie, 34, 1011-1017.
Liang, J., Chen, C., Song, X., et al. (2011) Assessment of Heavy Metal Pollution in Soil and Plants from Dunhua Sewage Irrigation Area. International Journal of Electrochemical Science, 6, 5314-5324. https://doi.org/10.1016/S1452-3981(23)18409-4
Hong, T., Kong, X.S. and Yue, X.F. (2019) Concentration Characteristics, Source Analysis, and Potential Ecological Risk Assessment of Heavy Metals in a Peak-Cluster Depression Area, Southeast of Yunnan Province. Environmental Science, 40, 4620-4627.
Shi, R., Wu, X.F., Li, Y., et al. (2015) Plant Species Applied in Phytoremediation of Heavy Metal Contaminated Soils. Journal of Central South University of Forestry and Technology, 35, 139-146.
Liu, Y.J. and Man, X.L. (2015) Morphology of Soil Zn and Mn in Main Forest Types and Potential Ecological Risk in the Great Xing’an Mountains. Journal of Beijing Forestry University, 37, 45-52.
Yang, W., Li, P., Rensing, C., et al. (2019) Biomass, Activity and Structure of Rhizosphere Soil Microbial Community under Different Metallophytes in a Mining Site. Plant and Soil, 434, 245-262. https://doi.org/10.1007/s11104-017-3546-9
Sun, C.Y., Zhao, W.J., Zhang, Q.Z., et al. (2016) Spatial Distribution, Sources Apportionment and Health Risk of Metals in Topsoil in Beijing, China. International Journal of Environmental Research and Public Health, 13, 727-740. https://doi.org/10.3390/ijerph13070727
Zhong, Q., Wang, Y.H. and Jiao, L. (2016) Characteristics and Spatial Variability of the Soil Heavy Metals Contents in Shirshiri Area. Research of Soil and Water Conservation, 23, 360-365.
Yang, X.Y., Liu, X.Z., Du, X., et al. (2009) Distribution of Heavy Metal Elements of Coal Powder in Jiangxi. Environmental Science and Technology, 32, 115-117.
He, Y., Li, Q.H., Tang, L., et al. (2019) Evaluation and Source Analysis of Heavy Metal Pollution in Sediments of Hongfeng Reservoir in Guizhou Province, China. Chinese Journal of Ecology, 38, 799-809.