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为探明黄土高原半干旱地区柳枝稷生物质产量和燃料品质随收获时间的变化规律,确定适宜的收获时间,在甘肃省庆阳市进行田间试验,研究收获时间对柳枝稷生物质产量与燃料品质的影响。结果表明:1)随收获时间的推迟,柳枝稷生物质产量呈下降趋势,且叶片所占比例逐渐降低,说明产量损失主要是叶片脱落。2)柳枝稷生物质热值总体上呈降低趋势,开花期热值显著高于其他时期;延迟收获显著降低了柳枝稷生物质含水量和灰分含量;随收获时间推迟,柳枝稷茎叶纤维素、木质素含量提高,半纤维素含量降低;枯亡期之后柳枝稷生物质中K、Mg、Na、Cl等不利于燃烧的矿质元素含量显著降低,生物质的燃料品质提高。3)在柳枝稷能源生产模式下,生育季节末期柳枝稷地上部衰亡后收获生物质燃料品质较好。
In order to find out the change rule of biomass and fuel quality of switchgrass in semiarid area of Loess Plateau with the harvest time, the suitable harvesting time was determined and the field experiment was conducted in Qingyang of Gansu Province to study the effects of harvest time on the biomass and fuel quality of switchgrass influences. The results showed that: 1) with the delay of harvest time, the biomass of switchgrass decreased, and the proportion of leaves gradually decreased, indicating that the loss of yield was mainly the loss of leaves. 2) The calorific value of biomass of switchgrass tended to decrease as a whole, and the caloric value of flowering stage was significantly higher than that of other periods. The delayed harvest significantly reduced the biomass water content and ash content of switchgrass. With the delay of harvest time, And the content of hemicellulose decreased. The content of mineral elements such as K, Mg, Na and Cl in the biomass of switchgrass after switch off was significantly reduced, and the fuel quality of biomass increased. 3) Under the energy production mode of switchgrass, the quality of biomass harvested after switch-off of switchgrass at the end of the growing season is better.