大埔县是韩江上游水土流失严重县份之一。据1983年航片普查,流失面积达395.53km~2。占山地面积的19%。该县是陶瓷生产区,有瓷厂660间,砖瓦厂334间。农村人口40万人。据有关方面计算,每年需烧去木柴五十万m~3。森林面积逐年减少,森林覆盖率由1951年的80%下降到1984年的36%,森林面积平均每年减少四万亩。 近年来,在党和政府重视下,在封山育林、节燃改烧等方面取得了一定的成绩。由于该县交通不便,缺煤、缺油,在改烧柴为烧煤和油草混烧、油煤混烧陶瓷等方面,仍然存在很大的困难。发展沼气对于缓和烧柴矛盾巩固封山育林成果,防治新的水土流失,具有重要意义。 Dapu County is one of the most serious soil erosion in the Hanjiang River. According to the 1983 Air Navigation Census, the drainage area reached 395.53km ~ 2. 19% of the mountain area. The county is a ceramic production area, there are 660 porcelain, brick factory 334. Rural population 400,000 people. According to the calculations of the parties, it is necessary to burn 500,000 m 3 of wood every year. The area of ​​forest has decreased year by year. The forest coverage rate has dropped from 80% in 1951 to 36% in 1984, and the forest area has decreased by 40,000 mu per year on average. In recent years, under the attention of the party and the government, certain achievements have been made in such fields as closing hillsides to facilitate afforestation and saving fuel and burning flames. Due to traffic inconvenience, lack of coal and lack of oil in the county, there are still great difficulties in changing the burning wood for the burning of coal and the blending of oil and grass, and the oil-coal mixed burning ceramics. The development of biogas is very important for alleviating the contradiction between burning firewood, consolidating the achievements of closing hillsides for afforestation and preventing and controlling new soil and water loss.