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EFFECTS OF DIFFERENT MIXED PLANTING PATTERNS OF CHINESE FIR (CUNNINGHAMIA LANCEOLATA) ON CHEMICAL FORMS OF ALUMINUM IN SOIL

Jiabao Zhang

Published 2019 in Applied Ecology and Environmental Research

ABSTRACT

Aluminum (Al) toxicity is an important cause of forest degradation. Al phytotoxicity is closely related to its chemical forms in soils. In this study, the effects of different mixed planting patterns of Chinese fir (Cunninghamia lanceolata) on four chemical forms of Al in soils were examined. One-yearold seedlings of C. lanceolata, Michelia macclurei and Schima superba were used. The results showed that the content of exchangeable Al and monomer hydroxy Al decreased by 2.3–8.1% and 2.6–14.2% in soil of mixed plantation of C. lanceolata with M. macclurei, whereas they decreased by 6.6–6.9% and 7.2–7.3% in bulk soil of C. lanceolata mixed with S. superba. The content of acid-soluble inorganic Al in soil of mixed plantation of C. lanceolata also indicated a decreasing tendency, whereas the content of humic acid Al indicated an increasing tendency. Meanwhile, soil pH indicated an increasing tendency and had a negative correlation with all chemical forms of Al in soil. These results indicated that mixed planting patterns of C. lanceolata could reduce active Al in soil and would be an alternative alleviation method to control the harmful effects of Al on C. lanceolata forest.

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