杉木人工林氮磷钾配方施肥的依据及应用研究

FORMULATED NPK—FERTILIZATION IN A CHINAFIR PLANTATION

本文以配方施肥理论为指导,首次提出了以当地Ⅰ立地类型阔叶林砍伐后的第一代杉木人工林作目标产量的参比标准,结合杉木生态特性来计算杉木的需肥量。经进行试验表明,此种方法目标明确,定量准确,效果显著,是促进杉木速生丰产的有效途径。具有广阔的应用前景。

Preliminary studies on quantified fertilization in Chinafir plantations were conducted by applying the formulated fertilization techniques. Taking the yield of the first-generation Chi- nafir plantation established after felling of the broadleaf trees on a site Ⅰ plot as the target yield and the relevant soil fertility level as the reference standard, with further consideration of the physiologic characteristics of Chinafir tree itself, the fertilizer application quantity was successfully predicted using target yield estimation for nitrogen; equilibrated desorption isotherm for phosphorous; and quantity-buffering capacity determination for potassium. The proposed method is practical and effective with reasonable theoretical basis in comparison to those commonly used empirical forest fertilization techniques.