金沙江头塘小流域5种人工林种子库研究.

For understanding the status of soil seed bank and providing updated prediction for vegetation restoration in Toutang small watershed of Jinsha River, soil samples were collected from five typical plantations for seed germination test. The results showed that:(1) there were 22 families of plants, 41 species of plants. Among them, the vast majority was herbaceous plants, with 34 species, accounting for 82.930%; shrubs, with 4 species, accounting for 9.756%; and trees, with 3 species, accounting for 7.317%.(2) The order of the density of seed germination was upper layer, middle layer and lower layer from high to low. The density of upper seeds was significantly higher than the middle and the lower. There was little difference in terms of number of seeds at middle layer and lower layer.(3) The largest seed reserves was Pinus yunnanensis-Pinus armandi mixed plantation with 933 grains/m~2, the lowest seed reserves was P. yunnanensis with only 399 grains/m~2.(4) The richness of species was in the order of P. yunnanensis × P. armandi, P. armandi, Alnus nepalensis, P. yunnanensis and Acacia dealbata.(5) There were some similarity between soil seed bank and vegetation composition, and the similarity coefficient was 0.222 2～0.500 0. Except for the low similarity coefficient of A. nepalensis, the calculation results of the similarity coefficients of other plots showed that the above-ground vegetation and soil seed band were moderately similar. [ABSTRACT FROM AUTHOR]