湖南省会同县两个森林群落的生物生产力

本文就我国亚热带分布最广、最有代表性的两个森林群落——杉木人工林和马尾松天然次生林的生物生产力进行了测定，并从群落的现存量、营养元素和叶绿素含量以及群落中光照分布和消光系数等方面进行分析和比较。

Biological Productivity of Two Forest Communities in Huitong County of Hunan Province

Standing crop of representative 20 year-old stands of natural Pinus massoniana and artificial Cunninghamia lanceolata determined by destructive analysis.Standing crop in Pinus massoniana community and Cunninghamia lanceolata community were respectivity 106.80 ton/ha and 156.31 ton/ha. The standing crop and net production of trees layer were respectively 100.62 ton/ha and 5.03 ton/ha/yr for Pinus massoniana community, 150.85 ton/ha and 7.54 ton/ha/yr for Cunninghamia lanceolata community. The amount of nutrient elements in 1 ton standing crop of trees layer were respectively 13.22 kg for Pinus massoniana community and 14.56 kg for Cunninghamia lanceolata community, it is worth notice that the amount of nutrient elements in 1 ton standing crop of subordinate vegetation is 3.6--4.5 times than trees layer. Standing crop and amount of nutrient element of litterfall were respectively 2.3 ton/ha, 58.37 kg/ha for Pinus massoniana community; and 1.4 ton/ha, 47.82 kg/ha for Cunninghamia lanceolata community. Returning litterfall to soil could lead to increasing of the organic matter in soil and increasing the cycle speed of nutrient elements in Pinus massoniana community were better than in Cunninghamia lanceolata community.Chlorophyll content and extinction coefficient of community were presented and compared. The results show that artificial Cunninghamia lanceolata community can use light energy more efficiently than the natural Pinus massoniana community.