Carbohydrates and predicted ethanol yield of different sweet sorghum cultivars at two nitrogen levels in arid region | 氮素对干旱地区甜高梁碳水化合物和理论乙醇产量的影响研究

Chinese. 利用新疆干旱地区4个甜高粱常用品种（杂交种早熟1号和醇甜2号,常规种丽欧和绿能3号）研究其在2个氮素水平下（N0：0 kg/hm2 N和N150：150 kg/hm2 N）全生育期不同碳水化合物含量和产量的变化规律,用以了解品种和氮肥对甜高粱碳水化合物产量的影响,并评估这4个品种在新疆干旱地区生产乙醇的潜力。研究结果表明,随着生育进程的推进,全株可溶性碳水化合物的含量和产量,纤维素、半纤维素的产量都呈现增加趋势,而全生育期半纤维素的含量较稳定。不同的甜高粱品种全株碳水化合物的含量和产量有显著差异,杂交种早熟1号和醇甜2号全株可溶性碳水化合物的产量显著（P〈0.05）高于常规种丽欧和绿能3号。品种间不同器官碳水化合物产量所占比重也不同,杂交种早熟1号和醇甜2号的可溶性碳水化合物主要分布在籽粒,而常规种丽欧和绿能3号的可溶性碳水化合物主要分布在茎。乙醇产量潜力分析表明,乙醇产量主要来源于可溶性碳水化合物;杂交种早熟1号和醇甜2号的总理论乙醇产量（分别为10 148和9 982 L/hm2）显著（P〈0.05）高于常规种丽欧和绿能3号的总理论乙醇产量（分别为9 017和8 728 L/hm2）。氮肥的施用并不能显著（P〈0.001）增加甜高粱全株可溶性碳水化合物的产量,但能显著（P〈0.001）增加全株纤维素、半纤维素理论乙醇产量。

English. To evaluate changes in carbohydrates content and yield during the growth duration,an experiment with four different sweet sorghum cultivars （Two hybrid cultivars,Zaoshu-1（ZS1） and Chuntian-2（CT2）,and two inbred cultivars,Rio and Lvneng-3（LN3）） at two nitrogen fertilizer levels （N0：0 kg/ha N and N150：150 kg/ha N） were carried out in arid region of Xinjiang province.This study will explore the effects of cultivar and nitrogen on carbohydrates yield,and predicted the ethanol yield （PEY） for the four sweet sorghum cultivars in arid region.The results showed：Soluble carbohydrates content and yield,celluloses and hemicelluloses yield of the whole plant were increased,but the hemicelluloses content were stable during the growth duration for all the treatments.Cultivar significantly （P〈0.001） affected the carbohydrates content and yield.Hybrid cultivars （ZS1 and CT2） produced significantly （P〈0.05） higher soluble carbohydrates yield than that of inbred cultivars （Rio and LN3）.Carbohydrates yield of different organs for four cultivars were varied.Most soluble carbohydrates yield was stored in grain for the hybrid cultivars （ZS1 and CT2） whereas stem from inbred cultivars （Rio and LN3） was the main organ for accumulating the soluble carbohydrates.The result showed that predicted ethanol yield （PEY） was mainly from the soluble carbohydrates yield.The potential of sweet sorghum hybrid （ZS1 and CT2） as feedstock for ethanol were 10 148 and 9 982 L/hm2 respectively which were significantly higher than those from the inbred cultivars （Rio and LN3） for biofuel production with 9 017 and 8 728 L/hm2 respectively.The application of nitrogen fertilizer （150 kg/ha） could not significantly （P〈0.001） increase soluble carbohydrates yield,but could significantly （P〈0.001） increase the celluloses, hemicelluloses and total predicted ethanol yield.