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(五)林地施肥:日本的人工林长势很好,原因有两个方面,第一是采取维护地力的措施,第二是林地施肥:1、维护地力的办法有:第一、采取保持水土的耕作措施;第二是旱地灌水,积水高湿地的排水对柳杉效果良好。在过湿的条件下,根系吸收氧气少,呼吸作用减弱,或土壤中的氧化还原电位下降,亚氧化铁等还原物质侵入根内,起到了毒害作用(这点在洪雅林场有参考价值),因此应开沟排水。第三是林粮间作:第四是种植肥料草和肥料树。绿肥草有紫苜蓿、羽扁豆和金雀花;肥料树有胡枝子、垂桤木、亦杨、杨梅等。2、林地施肥:在人工林大发展时期,曾广泛进行林地施肥,对于促进林木生长,提高单位面积产
(E) Forest fertilization: Japan’s plantations grow well for two reasons, the first is to take measures to maintain fertility, the second is the fertilization of forest land: 1, ways to maintain fertility are: First, to maintain the soil and water Tillage measures; the second is dryland irrigation, stagnant high water wetland of cedar effect of good. In the wet conditions, the root absorbs less oxygen, respiratory effects weakened, or redox potential in the soil decreased, ferrous oxide and other reducing substances invade the root, played a toxic effect (this point has a reference value in Hong Ya Lin) , So should ditch drainage. The third is forest intercropping: the fourth is the planting of fertilizer and fertilizer tree. Green manure grass with purple alfalfa, lupine and broom; fertilizer tree Lespedeza, weeping wood, also Yang, red bayberry and so on. 2, fertilization of woodland: In the period of great development of plantations, forest land fertilization has been widely carried out to promote the growth of trees and improve the yield per unit area