土壤氮素矿化与土壤供氮能力——Ⅲ.旱地土壤氮素矿化的数学模型

Soil Nitrogen Mineralization and Soil N-Supplying Capacities Ⅲ. Mathmetical Models for Dryland Soil N Mineralization

根据一级化学动力学反应方程,利用数值解的电子计算机优化程序,把矿化氮分为易矿化氮和难矿化氮两部分,分别求出了他们的矿化数量(N_1,N_2)及其矿化速率常数(k_1,k_2),建立了土壤氮素矿化的数学模型。结果表明,易矿化氮约占土壤全氮的10％左右,与作物吸氮量的关系最为密切。其主要来源于酸解性氨基酸氮。

Based on first-order chemical equation, the N-mineralization was split into two nitrogen fractions.- a easily decomposable N-fractiona GV,) and a resistant, slowly decomposable organic N-fraction (N2) using a computer optimation programme, the amounts of the two N-fractions and their decomposable rates or reaction coefficients (k1, and k2) were obtained, andmathematical models for soil N mineralizations were established. The results show that the easily decomposable N-fraction mainly from hydrolyzable amino-acid N occupied about 10% total N, having the closest correlation with plant uptake N.