Flat Thorn Comparison Of Castanopsis - China Schima Superba Natural Hardwood Forests And Plantations And Management Techniques

Comparison between Secondary Broad桳eaved and Plantation in Castanopsis P/atyacantha and Schima Sinensis Forest and the Research on the Management Measure Zhang Yuanbin (College of Forestry and Horticulture, Sicbuan Agricultural University, ya抋n, 625014) Abstract Using the method of community research on natural secondary broad-leaved forest and plantation in Castanopsis Plalyacantha and Schima Sinensis forest, the community comparison including species diversity, living tree class and pattern of dominant population, growth in diameter, height and volume of dominant tree, and biomass of tree layer, have been studied in this paper. The results indicate: The Shannon梬iener index of diversity of the tree layer of artificial mixed forest community, the bush layer of cunninghamia lanccolata pure forest community (thinned stand) and the herb layer of larix kaempferi pure forest (3m x4m) is3 .4664, 3.8331 and 4.1159 respectively. With the increase of coverage of tree layer, the species diversity of bush and herb layer decreases. Giving up control burning, level-strip soil preparation, conserving indigenous broad-leaved tree and planting conifer tree, suitable density and thinning is an effective measure for inducing the development of the under vegetation, conserving biodiversity and maintaining productivity of forest soil. Naturally regenerated indigenous broad-leaved trees under the plantation belong to increasing or stable population. The castanopsis platyacantha population in artificial mixed forest and secondary broad-leaved forest belongs to increasing population. But the litsea cubeba belongs to declining population. With the development of succession, the population will diminish. The dominant population in stable secondary broad-leaved forest community belongs to stable population, but the Machicuspingii in sub-free layer belongs to increasing population. With the development of succession, the contagious degree of population becomes smaller and smaller, and the dominant populations are declined to random distribution in secondary broad-leaved forest. The reason was discussed in this paper. After planting 8 years, growth in volume and diameter of dominant frees in 84 mixed forest is faster than that of the same dominant trees in secondary broad-leaved forest. The growth in height of dominant trees in mixed forest is slower than that of dominant trees in secondary broad-leaved forest. Growth in volume, diameter and height of Larix Kaempferi in small density (833N . hnf2) is faster than that of Larix Kaempferi in moderate density (666N Growth in volume and diameter of conifer trees in mixed forest is faster than that of the same conifer trees in pure forest. Growth in height of conifer tree in mixed forest is faster than that of conifer trees in pure forest in early time, but the result is contrary in the median-time and later period. The dry biomass of tree layer in natural secondary broad-leaved forest community is higher than that of the same age mixed forest and plantation, and the biomass of mixed forest is too bigger than that of plantation. The dry biomass of the natural secondary broad-leaved forest (18a and 45a) is 241.3344 and 469.6757 T ~-2 respectively. The organ...