Ecological Benefits of Mixed Stand of Cunninghamia Lanceolata and Camptotheca Acuminata
WANG De-yu(Forestry district of Hefei city of Anhui, Hefei 230001, China)
Successive cultivation of pure coniferous plantations has many defects, such as its soil degradation and fire damage. Planting mixed coniferous broad-leaved forests may be one of the most available methods to dispel these defects. Thus in 1984,15 hm 2coniferous broad-leaved forests with several tree species was established at Bocun tree farm, Anhui province, in order to study their ecological benefits. The report deals with a part of the research project. The results, from experimental study done in the past several years, showed that the mixed stand of Cunninghamia lanceolata and Camptotheca acuminata had significant ecological benefits, such as its rational root system distribution, maintaining its soil fertility and site productivity in long-term, promoting its growth and enhancing its fire resistant ability. The mean DBH and height of C.lanceolata in 16-year-old mixed stand increased by 18.4 % and 16.8 % respectively. The content of organic matter, total N, hydrolysable N, available P, available K, granule of soil, capillary and natural water in 0~20 cm layer in 16-year-old mixed stands were 32.4 %, 23.6 %, 38.2 %, 18.6 % 22.8 %, 35.9 %, 9.0 % and 8.9 % higher than these in the pure stand with same age respectively. The amount of combustible matter on woodland of mixed stand was 2.05 t·hm -2 less than that in pure stand. The content of moisture, ash and lignin in the combustible matter from the woodland of mixed stand were 33.2 %, 34.6 % and 12.4 % higher than these and benzene-ethanol extract in the combustible matter from mixed stand were 33.2 % and 41.2 % lower than these in the pure stand. It was thus clear that the mixed stand was suitable for enhancing its fire resistant ability.
【CateGory Index】： S718.5