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Vesper(金币+10, 翻译EPI+1): 2010-11-02 20:19:33
要是给出全部中文，估计很简单！
With a flat as a reference, the study is involved in 4 land types, pine forest, the slope of barren hill, planted with cutrus orangeand camphor from terrace lands,repectively. Pine forest is covered with pine planted in 1989, which has a coverage of 1250 tree/ hm2 , an average tree height of 12 m and an average DBH of 28cm. It was found few of vegetations in the forest with the coverage only about 0.4 tree/ hm2, such as tea-oil camellia (Camellia oleifera)，栀子Gardenia. It was ascribed to soil leanness owing to severe erosion of the soil and thus exposure of pine roots. Since three years ago, the hill has been barren due to the cut-off by the local residents for fuel-wood consumption. The main reamined shrubs are (五节芒)aiscanthus floridulu，and (短柄枹栎)q.serrata var.brevipetiolata, and the蒿草armoise is a main herb. Cutrus orange trees were planted terrace lands with density of 1350 tree/hm2 in 1995. There are a few 洋蒿Conyza sumatrensis和蒿草armoise. Camphor trees as an economic plant were planted 3-4 years ago. Now, the terrace land is covered with plenty of litters and a few of shrub and herb. |
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