杉木、油桐、仙人草复合模式的根际土壤肥力

通过对2年生杉木、油桐、仙人草复合经营模式及对照杉木纯林根际土壤肥力的研究，得出结果：复合经营模式全土pH值比对照的高，模式中杉木、油桐、仙人草根际土壤的有机质和全氮（N）含量均比全土大；对照中杉木根际土与全土有机质和全N量的差值比复合经营模式的大，复合经营模式及对照的杉木根际土壤水解性N均比全土大，而速效磷（P）、速效钾（K）则比全土低。复合经营模式中，与杉木根际土壤相比，仙人草和三年桐根际微生物总数及生理类群数量大，土壤生化活性强，复合经营模式全土和杉木根际土壤微生物数量和生化活性均比相应对照大。这说明复全经营模式的林地能维持较高的土壤肥力，从而促进复合经营模式中杉木生长。

Rhizospheric Soil Fertility under Compound Pattern of Cunninghamia lanceolata-Aleurites fordii-Mesora chinensis

A study on rhizospheric soil fertility under compound pattern of Cunninghamia lanceolata-Aleurites fordii-Mesora chinensis was carried out, and the results showed that the pH value was higher under compound pattern than under the control. The contents of organic matter and total N of rhizospheric soil wers both higher than those of soil under compound pattern. The difference in content of organic matter and total N between rhizospheric soil and total soil of Cunninghamia lanceolata was higher than that of soil under compound pattern. The rhizospheric soil has higher hydrolyzed N, and lower available P and available K than total soil both under compound pattern and the control. The rhizospheric soil of Aleurites fordii and Mesora chinensis had more figure in microbes and physiological groups. and higher biochemical activity than that of Cunninghamia lanceolata. and the amount of microbes and biochemical activity of total soil and rhizospheric soil under compound pattern were both higher than those under the control. It concluds that compound pattern can benefit the soil fertility. and hence stimulate the growth of Cunninghamia lanceolata.