中龄林
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young and middle aged forest 幼壮林
young and middle-aged forest 幼中龄期
natural young middle-aged forest 天然幼中龄林
middle-aged natural forest 天然中龄林
middle aged forest
中年森林
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The wilting litter of the middle aged secondary mountain poplar forest and the decomposing process of litter as well as an amount of their accumulation were analysed with changes in time.
通过对黄土丘陵区中龄山杨次生林的凋落物及其分解过程，以及蓄积量随时间变化的分析，研究了枯枝落叶层的持水和截留作用及其蓄水减沙效益。
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