摘要
摘要:上黄村草地土壤生态系统能量投入主要是动力投入,无营养物质的投入。人工草地能量产出占总能量产出的50％以上,而面积仅为20～52％;草地土壤能量投入具有起伏性,产出有波动性。草地土壤生态系统营养物质移出是草地土壤肥力退化根本原因,无营养物质投入的人工草地,更加剧了营养物质的迁出及土壤肥力的退化。
The power was a major input on the grassland ecosystems in Shanghuang village of the loess hilly region. There was no nutrients input on the ecosystems. The energy output from the artificial pasture was over 50% of total energy output, but area of artificial pasture was only 20～52% of total area. The energy input and output of the ecosystems were fluctuated. The reasons of fertility on the grassland ecosystems decreased were that the nutrients transferred from soil to plants. and no nutrients input on the artificial pasture have maken the situtation worse.
出处
《草业科学》
CAS
CSCD
北大核心
1992年第3期19-22,共4页
Pratacultural Science
关键词
能量投入
能量产出
草地生态
: Loess Hilly, input, output, energy, nutrients.
