Abstract: The dynamics of the nutrient yields,calorific value and the conversion efficiency for solar energy of oat artificial grassland were discussed in this paper.The net productivity of nutrients of the aboveground were crudeprotein 89.63g/m²,crude fat 30.33g/m²,nitrogen-free extract 603.43g/m²,crude ash 75.26g/m²,calcium 2.05g/m² and phosphorus 1.35g/m².The net primary producti-vity of the whole sward was 27229.709KJ/m² in terms of energy.The conver-sion efficiency for yearly total radiation of the whole sward,the aboveground and the underground were 0.654%,0.548% and 0.106% respectively;for the phy-siological radiation,they were 1.308%,1.098% and 0.213% respectively;and for the photosynthetic available radiation during growing period,they were 2.803%, 2.351% and 0.456% respectively.The optimum harvesting time was suggested.

Key words: oat artificial grassland, nutrients, conversion efficiency for solar radiation

摘要： 本文探讨了高寒牧区燕麦人工草地的营养物质产量动态、热值动态及其光能转化率。试验结果表明,燕麦草地地上部分的净营养物质产量为粗蛋白质89.63克/m²,粗脂肪30.33克/m²,无氮浸出物603.43克/m²,粗纤维331.80克/m²,粗灰分75.26克/m²,钙2.05克/m² 及磷1.35克/m²。以能量表示的燕麦草地全草层的净初级生产力为27229KJ/m²·年,为太阳总辐射的0.654%,其中地上部分为0.548%,地下部分占0.106%;对可见光生理辐射的转化率全草层为1.308%,地上部分为1.098%,地下部分为0.213%;对生长季生理有效辐射转化率全草层为2.083%,地上部分为2.351%,地下部分为0.456%。同时,作者探讨了燕麦草地的适宜刈割期。

关键词: 燕麦人工草地, 营养物质, 光能转化率