在杉木伴生下的闽楠人工林生产力研究

Study on the productivity of Phoebe bournei accompanied by Cunninghamia lanceolata

对杉木伴生下的28年生闽楠人工林生产力研究结果表明:在杉木伴生下的闽楠人工林林分总生物量为171.87 t.hm-2,乔木层153.31 t.hm-2,分别比楠木纯林提高了62.79%、59.2%,平均年净生产量5.475 t.hm-2.a-1。乔木层楠木树干117.427 t.hm-2,分配比例为76.6%,比闽楠纯林干材生物量的分配比例68.2%提高了8.4%,以杉木为伴生树种的楠木林叶面积指数6.03,低于楠木纯林,但叶净同化率4 193.82 kg.hm-2.a-1,却高于楠木纯林,分别增加了78.8%。以杉木为伴生树种的楠木林林分生产力高于楠木纯林。这与闽楠的生物学特性及林分经营方式有关。

The study on the productivity of 28-year-old Phoebe bournei accompanied by Cunninghamia lanceolata showed that total biomass of P. bournei plantation accompanied by C. lanceolata was 171.87 t·hm^-2 and arbor layer 153.31 t· hm^-2, which were 62.79 % and 59.2 % higher that that of C. lanceolata pure plantation respectively. The average net yield was 5. 475 t· hm^-2·a^-1. The P. bournei of arbor layer got net yield 117.427 t·hm^-2 with proportion 76.6%, which was 8.4% higher than that of its pure plantation with proportion 68.2 %. The leaf area index of P. bournei plantation accompanied by C. lanceolata was 6.03 which was lower than that of its pure plantation, but the net leaf assimilation rate of P. bournei plantation accompanied by C. lanceolata was 4 193.82 kg·hm^-2·a^-1 which was higher than that of its pure plantation, all of which increased 78.8%, respectively. The result indicated the productivity of P. bournei plantation accompanied by C. lanceolata was higher than that of its pure plantation, which was relative to the biological characteristics of P. bournei and the plantation management ways.