杉木幼林施用不同品种磷肥的肥效研究

１９９２－１９９５年，对杉木幼林施用不同品种磷肥的肥效反应进行了研究。结果表明：（１）磷肥施用第一年末，开始出现肥效，磷酸氢二铵、钙镁磷肥的肥效较高，过磷酸钙和磷矿粉肥效不明显；第二年末，肥效反应最大；施肥第３年末，不同磷肥品种肥效都开始下降；施肥后第四年磷肥肥效比前一年明显下降；（２）不同品种磷肥对杉木幼林地径、树高和冠幅影响很不一致，磷肥对地径、胸径的增长普遍有效；（３）在立地指数为１８的肥沃土壤施用磷肥作用不大。

Studies on the Effect of Different Varieties of Phosphate Fertilizers on Young Forests of Cunninghamia lanceolata

From 1992 to 1995，studies were conducted on the effect of different varieties of phosphate fertiliz-ers applied to young forests of Cunninghamia lanceolata. The results showed that the fertilizer effect startedto arise at the end of the first year of the phosphate fertilizer application：it was maximal at the end of thesecond year：it started to reduce at the end of the third year and the phosphate fertilizers had an effect on theincrease of the ground diameter and dbh.