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以元谋干热河谷区赤桉、新银合欢等纯林为参照,对苏门答腊金合欢×赤桉混交林进行调查和综合生态经济效益分析。结果表明:苏门答腊金合欢×赤桉混交林首伐期生物产出量(干物质)为19.20 t/hm2,按照其热值折合标准煤约11.8 t/hm2,明显地高于赤桉纯林(7.08 t/hm2)、银合欢纯林(5.47 t/hm2)和苏门答腊金合欢纯林(2.97 t/hm2);绝对经济效益(纯收入)1.23万元/hm2,分别是赤桉纯林(0.74万元/hm2)的1.7倍、银合欢纯林(0.42万元/hm2)的3.0倍和苏门答腊金合欢纯林(0.14万元/hm2)的9.2倍;投入产出比为1.0∶5.9,略低于赤桉纯林(1.0∶6.2),但明显高于银合欢纯林(1.0∶2.9)和苏门答腊金合欢纯林(1.0∶1.6)纯林。此外,该混交林模式具有高度的稳定性,并能实现天然更新。
Taking Yuanmou dry and hot valley of Pure Eucalyptus and New Acacia as reference, this paper investigated the Acacia × Acacia × Eucalyptus and Sumatra mixed forest and analyzed the comprehensive ecological and economic benefits. The results showed that the biomass (dry matter) of A. capitatum × E. tibetanum mixed forest at the first cutting stage was 19.20 t / hm2, which was about 11.8 t / hm2 according to its calorific value, which was obviously higher than that of the pure Eucalyptus globulus 7.08 t / hm2), pure silver forest (5.47 t / hm2) and pure Sumatra (2.97 t / hm2); absolute economic benefit (net income) was 1.23 million yuan / hm2, 1.7 times than that of the pure silver (0.42 yuan / hm2) and 9.2 times of the pure pure (0.14 yuan / hm2) of Sumatra. The input-output ratio was 1.0: 5.9, Lower than that of Pure Eucalyptus (1.0: 6.2), but significantly higher than that of Pure Acacia (1.0: 2.9) and Pure Sumatra (1.0: 1.6). In addition, the mixed forest model is highly stable and enables natural regeneration.