武夷山黄山松群落能量的研究

Study on energy of Pinus taiwanensis community in Wuyi Mountains

在生物量、生产力研究的基础上，通过干重热值测定，对黄山松（ Ｐｉｎｕｓ ｔａｉｗ ａｎｅｎｓｉｓ）群落的能量现存量、能量净固定量及太阳能转化效率进行分析讨论。测定结果表明：（１）黄山松群落各组分样品的干重热值具有一定的差异，树皮的干重热值最高，为 ２２１４ｋ Ｊ／ｇ，枯根的干重热值最低，为 １６２７ｋ Ｊ／ｇ。（２）黄山松群落的能量现存量为 ３７９８３２３ｋ Ｊ／ｍ ２，其中地上部分为 ２７５４８８０ｋ Ｊ／ｍ ２ （占 ７２５％ ），地下部分为 １０４３４４３ｋ Ｊ／ｍ ２ （占 ２７５％ ）；１９９３ 年黄山松群落的能量净固定量为２０６５４１ｋ Ｊ／ｍ ２·ａ，其中用于群落自身增长的能量为 １３８９４４ｋ Ｊ／ｍ ２·ａ，而释放至其它子系统的能量为 ６７５９７ｋ Ｊ／ｍ ２·ａ。（３）林地太阳光合有效辐射能的转化效率为 ０９９７％ 。

On the basis of the biomass and productivity research,and by means of calorimetry measurement,the standing crop of energy,net energy production and energy conversing efficiency of Pinus taiwanensis community were determined.The results were as follows:(1)There were some differences in the gross caloric value among the fractions of Pinus taiwanensis community.The gross caloric value of bark of trunk was the highest(22 14kJ/g),that of dead root was the lowest(16 27kJ/g).(2)The energy in standing crop of Pinus taiwanensis community was 379832 3kJ/m 2.The energy value of the aboveground was 275488 0kJ/m 2(accounting for 72 5%)and that of belowground was 104344.3kJ/m 2(accounting for 27 5%).Net energy production was 20654 1kJ/m 2·a for Pinus taiwanensis community in 1993,in which the energy for growth accumulation was 13894 4kJ/m 2·a,the energy of releasing to other branch ecosystem was 6759 7kJ/m 2·a.(3)To the photosynthetic active radiation on the stand,the energy conversing efficiency of Pinus taiwanensis community was 0 997%.