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炼山是我国南方林区栽培杉木的重要环节,近年来随着杉木丰产林基地建设的迅猛发展,炼山引起的生态问题已日益引起人们的关注。但目前林业界对炼山的利弊众说纷纭。鉴于此,我所承担了国家“七五”攻关项目“炼山对杉木人工林生态系统影响的研究”,在福建尤溪建立了12个不同坡度径流小区,对炼山林地的水土流失规律、炼山引起的土壤理化性质、微生物数量、酶活性的变化及林木生长效果进行了连续4年系统的观测。研究结果表明,炼山造成了严重的水土流失。炼山第1年的径流量和泥沙冲刷量分别达2743.3立方米/公顷和24.8吨/公顷,分别是不炼山林地的11倍和88倍,炼山后3年中,有机
In recent years, with the rapid development of Cunninghamia lanceolata forest base construction, the ecological problems caused by refining have attracted more and more attention. However, there are different opinions on the pros and cons of refining mountains in the forestry sector. In view of this, I have undertaken the national “Seventh Five-Year” research project “the impact of refining hillsides on Chinese fir plantation ecosystem research” in Fujian Youxi established 12 different slope runoff plots, on the mountain forests of the law of soil erosion, The physical and chemical properties of soil, the amount of microorganisms, the change of enzyme activity and the effect of forest growth caused by refining were systematically observed for 4 years. The results show that the refining of the mountain caused serious soil erosion. The runoff and sediment flushing volume in the first year of Lianhe Mountain reached 2743.3 cubic meters per hectare and 24.8 ton per hectare, respectively, 11 times and 88 times that of the non-alpine forest respectively. After 3 years of refining, organic