Effect of Mixed Forests of Chinese Fir and Tsoong's Tree on Soil Properties

Ｔｓｏｏｎｇ’ｓｔｒｅ（ＴｓｏｎｇｉｏｄｅｎｄｒｏｎｏｄｏｒｕｍＣｈｕｎ）ｉｓａｎａｎｃｉｅｎｔａｎｄｖｅｓｔｉｇｅｓｐｅｃｉｅｓｗｈｉｃｈｉｓｅｘｃｌｕｓｉｖｅｌｙｄｉｓｔｒｉｂｕｔｅｄｉｎＣｈｉｎａ．Ｔｈｅｔｒｅｅｇｒｏｗｓｆａｓｔａｎｄｉｔｓｗ...

An investigation and on 13 year old (1984～1996) Chinese fir and Tsoong's tree mixed forests in Jianou City, Fujian Province, China was carried out to compare the influences of different interplanting types of individual tree tree, row row, row strip (three rows) and pure Chinese fir stands on soil properties. Compared with the pure stands of Chinese fir, the mixed stands exerted a positive effect on soil fertility, with increases in soil organic matter, total N, available P and available K. Moreover, improvements were also observed in soil enzymatic activities, aggregate structure, structure stability, status of soil porosity, soil aeration and penetrability in mixed stands. The row row interplanted stands had the best effect on tree growth and soil properties among these mixed forests. In the southern subtropical region, the spreading of the row row mixing model of the two tree species would be helpful to preventing the soil from fertility deterioration caused by successive plantation of Chinese fir.