元谋干热河谷苏门答腊金合欢×赤桉混交林的效益分析

Benefit Analysis of Acacia suma Mixed Forest with Eucalyptus camaldulensis in Yuanmou Dry-Hot Valley

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。

In this paper, taking pure forests of previously created Eucalyptus camaldulensis and Leucaena leuco- cephala in the Yuanmou arid-hot valley as a reference, the comprehensive ecological and economic benefit of previ- ously built Acacia suma mixed forest with Eucalyptus camaldulensis was investigated. The results showed that in the first rotation the biomass output of the Acacia suma mixed forests was up to 19.20 t/hm2 , according to the calorific value of about 11.8 t/hm2 of standard coal equivalent, and significantly higher than that of pure forest Eucalyptus camaldulensis （7.08 t/hm2 ）, Leucaena leucocephala （5.47 t/hm2 ） and Acacia suma （2.97 t/hm2 ） ; Its economic benefits （ net income, ￥ 12 300 per hm2 ） were the Eucalyptus camaldulensis pure forest of 1.7 times, the Leucaena leucocephala pure forest of 3 times and the Acacia suma pure forest of 9.2 times, respectively. The ratios of input to output （1.0： 5.9） slightly lower than the Eucalyptus camaldulensis pure forest, but significantly higher than the two pure forests of the Leucaena leucocephala forest and the Acacia suma forest. In addition, the mixed forest model had a high degree of stability and realization of natural regeneration. The suggests that in the dry-hot valley areas popu- larization of Acacia suma mixed forests not only provide firewood, and non-timber products, and also has important practical significance for vegetation restoration, reconstruction.