杉木光皮桦纯林及混交林生物量

从林分生长、生物量、空间分布格局及土壤养分等方面，对营造于福建南平的5年生杉木与光皮桦混交林及其纯林进行了研究。结果表明:杉木与光皮桦混交林及光皮桦纯林具有较高的林分生产力，光皮桦纯林和杉木光皮桦混交林生物量分别比杉木纯林大86.44%和30.87%。杉木与光皮桦混交林不仅有利于维护地力，促进杉木生长，而且还形成较好的林分结构，杉木光皮桦事状混交模式是值得推广的杉阔造林模型。图2表3参6。

Growth and biomass of pure stands of Betula luminifera and Cunninghamia lanceolata and their mixed forest

The stand growth,biomass,structure and soil fertility of the mixed model of Betula luminifera and Cunninghamia lanceolata and their pure stands at fifth year in Nanping of Fujian were studied.The results showed that the productivity of pure stands of Betula luminifera and mixed forest with Cunninghamia lanceolata were higher.The biomass of pure Betula luminifera stand and the mixed forest of Cunninghamia lanceolata and Betula luminifera increased by 86 44%and 30 87% than pure Cunninghamia lanceolata stand respectively.The mixed forest of Betula luminifera with Cunninghamia lanceolata not only could maintain soil fertility and promote growth of Cunninghamia lanceolata, but also form better stand structure.The mixed forest of Cunninghamia lanceolata and Betula luminifera was a practicable plantation model.