9.Except for basswood leaf, the other leavies can immobolize certain mount of nitrogen until reaching the critical points where the nitrogen content of the pine, oak, elm, birch, aspen, and maple leaf is 0.96%, 1.41%, 2.38%, 1.67%, 1.32%, and 1.32% respectively, From the critical points the leavies begin to release mineralized nitrogen.
除紫椴叶外,其它几种叶子在分解过程中氮的含量有一定增加。 但是,当红松、蒙古栎、春榆、白桦、山杨及色木叶中N素浓度分别为0.96%,1.41%,2.38%,1.67%,1.32%及1.32%时,则开始了N素的矿化释放。