黄土丘陵区梯田谷子养分循环特征与生产力关系的研究

The relationship of soil nutrient cycling characteristics with productivity of terrace millet on hilly loess plateau.

以新修梯田7年长期肥料定位试验为依据,研究了不同施肥条件下谷子各部位生物量、养分携出量、养分平衡以及耕层土壤养分时空变化。结果表明,有机肥与N、P肥配合施用可提高谷子的籽粒产量和生物产量。养分携出量的大小顺序为籽粒>叶>糠秕>茎,为同类地区农业生产及生态环境建设提供科学依据。

The 7-years long-term fertilization experiment was conducted on newly built terrace in Ansai Compre-hensive Research Station of Soil and Water Conservation, Chinese Academy of Sciences, located in hilly-gully loess plateau. Under different fertilization treatments the bio-yield, nutrient-absorbed amount, nutrient import and ex-port amount of millet, soil nutrient dynamic changes were discussed in this paper. The results showed that the compound organic manure with chemical fertilizer could increase grain yield and biomass of millet,and the sequence of nutrient-absorbed amount was grain>leaf>chaff>stem. It provides scientific basis for farming production and eco-environment construction in this area.