石漠化地区农村能源结构调整及其生态经济效应分析——以广西平果县龙何屯为例

Rehabilitation process of “Rocky Desert” region, im-provement of farm fuel and its ecological efficiency

关键词:  农村能源  沼气系统  植被恢复  生态效益

Key words:  farm fuels  methane system  vegetation restoration  ecological efficiency

摘要:

通过对岩溶石漠化地区农村能源结构调查显示,实施生态重建工程,开展沼气系统工程和薪炭林建设,节柴效果十分明显,龙何屯三个生产队的沼气普及率达60%以上,年总节柴量达96 408 kg,三个队节约燃烧生物量分别为31%、16%和20%,平均每年少砍森林面积10.25 hm²、6.44 hm²和7.46 hm²,沼气工程可以节省劳动力,龙何三个队的人均节柴工值分别为95元、53元和69元。同时,通过沼气工程建设,森林得以封育生息。经固定样地研究与测算,以这样的沼气利用水平,一年后,第一年只需砍伐69 hm²,第二年只需砍伐34.5 hm²,第三年为23 hm²,因此更多面积的植被将得以休养生息,植被恢复可望实现。

Abstract:

Methane system and fuel woodland is developing as a rehabilitation approach in the Longhe“rocky desert”sub-village(three producing communities). Over 60% of families were using methane for cooking,which saved a total fuel wood 96.41 t·a^-1 with fuel wood saving rate of 31%,16% and 20% in the three communities respectively. The result also shows vegetation conservation are 10.25 hm²,6.44 hm² and 7.46 hm² each year which therefore contributed to restoring the ecological environment because of using methane. Meanwhile,the improvement of farm fuel could save labors that were calculated as 95 CNY,53 CNY,and 69 CNY per person per year of each community. Basing on the fixed sampling and analysis,after using methane system,there are 69 hm² will clear for fuel in the first year,but the number would reduce by 34.5 hm² in the second year,then 23 hm² in the third year,consequently,more and more rocky area will be preserved and it is possible that the vegetation restoration will be achieved.