论文部分内容阅读
银合欢原产墨西哥,是热带、亚热带国家广为种植的乔木树,属豆科的含羞草亚科。它适应性强,根系发达,根瘤菌多,固氮能力强,枝叶含氮量高,萌芽力强,繁殖快。成林后的银合欢,既是用材林、薪炭林、水土保持林;又可作肥料和饲料用,故有“五料树”的美誉。一、对环境条件的要求银合欢喜光,但耐荫。喜欢温热湿润气候,最适生长温度为25～30℃,气温高过35℃仍能生长;也能忍受-3℃的低温。对土壤要求不严,但以微碱性、中性的砂壤土最为适宜。在酸性(pH5～5.6)红壤上仍能生长。它根系深,能耐旱,但不耐涝。由于具有根瘤菌,固氮能力强,因此,虽立地环境土壤贫瘠,它也能生长旺盛。
Acacia native Mexico, is a tropical, subtropical countries widely planted arborvitae, a leguminous mimosa subfamily. It is adaptable, developed roots, rhizobia and more nitrogen-fixing ability, high nitrogen content in leaves and branches, sprout strong, rapid propagation. Acacia after the forest, both timber forest, firewood forests, soil and water conservation forests; but also for fertilizer and feed, it is “five trees” in the world. First, the requirements of environmental conditions Silver Acacia happy, but shade. Like warm and humid climate, the optimum growth temperature is 25 ~ 30 ℃, the temperature can still grow above 35 ℃; also able to endure -3 ℃ low temperature. Not strict on the soil, but to alkaline, neutral sandy loam the most suitable. In acid (pH5 ~ 5.6) red soil can still grow. It is root deep, drought-resistant, but not resistant to waterlogging. Due to rhizobia, it has strong nitrogen fixation capacity, so it can grow vigorously even though the site environment is poor.