普遍覆盖在上述黄土上部及河谷阶地地带上更新世q 3的马兰黄土及全新世q 4下部的次生黄土，称之为新黄土。
The universal cover takes to bring with pleistocene epoch Q3 on the above loess and the valley terrace the Malan loess and lower part the brand-new world Q4 secondary loess, calls it the new loess.
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。
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。
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.
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