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Calorific values and nutrient composition of the leaves of monsoon evergreen broad leaved forest and some forest edge plants on Gushan Mountain in Fuzhou

LIN Cheng Chao (Geography Department,Fujian Teachers Universuty,Fuzhou,350007,China)  
The calorific values,ash contents and nutrient compositions in the leaves of the secondary southern subtropical monsoon evergreen broad leaved forest and 13 forest edge plants on Gushan Mountain in Fuzhou were studied.The rank order of the average ash contents in the leaves were shrub layer(10.0%)herbaceous layer(8.5%)tree layer(6.7%).The mean gross calorific values(GCV)increased from the herbaceous layer(16.89 KJ/g),to the shrub layer(17.75 KJ/g) and to the tree layer (19.79 KJ/g).The ash free calorific value(AFCV)was the highest in the tree layer,the second highest in the shrub layer and the lowest in herbaceous layer.They were 21.19,19.72 and 18.55 KJ/g,respectively.For the average nitrogen content,it increased from the coniferous trees of tree layer(0.82%),to the forest edge herbaceous plant Dicranopteris dichotoma (0.89%),to the forest edge shrub plant Rhodomyrtus tomentosa (0.90%),to the inner forest herbaceous plants(1.34%),to the broad leaved trees of the tree layer(1.55%) and to the inner forest shrub plants(1.84%).The average phosphorus contents were 0.18,0.21,0.23,0.25,and 0 27% for the forest edge shrub plant Rhodomyrtus tomentosa, the inner forest shrub plants,the coniferous trees of tree layer,the inner forest herbaceous plants and broad leaved trees of the tree layer,respectively.As for the potassium content,the highest was inner forest shrub plants(2.22%),and the lowest was the coniferous trees of tree layer(0.42%).There was no obvious variation in the sodium,calcium and magnesium contents in the leaves of various layers in the community.The relationships between calorific values and nutrient contents and the factors influencing the calorific values were discussed.
【CateGory Index】: Q948.112
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