摘要
通过对福建省长泰县一块巨尾桉林地18 a经营前后土壤各种养分指标的比较,揭示桉树林地长期经营对土壤肥力的影响,结果表明:土壤有机质、养分全量及交换性钙、镁、碱解氮等都有不同程度提高,而速效钾、pH值和速效磷等有所降低,分析认为杂交桉主要靠杂交优势而非靠消耗地力获得增产,杂交桉林地养分循环良好,土壤有机质增加,土壤供肥潜力提高;现有速效钾、pH值为林地正常值,18 a前测定的为炼山造林后的样品数据,草木灰(K2CO3)渗入土壤所致,速效磷降低为杂交桉对其需求量较大所致;建议在桉树人工林经营过程中应注意补充磷肥和钙肥。
Chemistry indexes of the E. grandis × E. urophylla forest lands were compared with those of lands 18 years ago in Changtai County, Fujian Province,to explain the influence of long- term management of soil fertility. The results showed that the soil organic matter, full dose of nutrient, exchangeable calcium, exchangeable magnesium and the alkaline hydrolysis nitrogen were increased, but the available potassium, the available phosphorus and pH value were reduced. It was believed that hybrid eucalyptus growth mainly depended on the heterosis, but not obtained from the consumption of soil fertility. Furthermore, the nutrient cycle of stand land was fine, for example, soil organic matter was increased and the capability of soil nutrients in supplying was enhanced. The observed value of available potassium and pH value was in the normal range, for the samples of 18 years ago forest lands were taken after vegetation was cleared off with a fire, and the K2 CO3 had been soaked into the earth, so their values of available potassium was higher. In eucalyptus fast growing season, the available nutrient demand was large, fertilizing phosphorus and calcium should be enhanced in order to promote its growth.
出处
《桉树科技》
2011年第2期50-55,共6页
Eucalypt Science & Technology
关键词
巨尾桉
土壤
化学性质
变化
E.grandis x E. urophyUa
forest soil
chemical property
change
