近30年渭南市秸秆生物能及其分布重心变化

基于农作物草谷比系数、可收割系数和折标煤系数,测算了1978—2011年渭南市各区县秸秆资源的生物能量,利用重心模型研究了渭南市秸秆生物能的重心分布范围及其空间变化情况。结果表明,2008—2011年渭南市秸秆资源年均理论蕴藏量为3.79×106 t,年均可收集量为3.17×106 t,年均折标煤量为8.81×105 t,秸秆资源中以粮食作物秸秆为主,约占90%,其中小麦和玉米约占98%;1978—2011年渭南市秸秆生物能量呈现波动上升趋势,其整体分布重心逐渐向西南方向移动,但移动幅度逐渐变缓;依据渭南市秸秆资源相关指标的地理分布情况,将其秸秆资源能源化利用区划分为重点开发区(临渭区、大荔县、富平县),适度开发区(蒲城县、合阳县、澄城县、华县和华阴市)和不宜开发区(韩城市、潼关县、白水县);渭南市秸秆生物能工厂初步选址可定在大荔县与蒲城县交界处且较为靠近临渭区的地段。

Biomass Energy of Crop Straw and Its Distribution Gravity Center Change of Weinan City in Last 30 Years

The biomass energy of crop straw was calculated from 1978 to 2011 in all counties of Weinan City based on the residue to product ratio, collectable ratio and standard coal equivalence ratio of crops. Meanwhile, the distribution range and spatial change of its gravity center was studied by using gravity center model. The results showed that the annual theoretical resources reserve of crop straw was 3.79×10⁶ t and the annual collected amount was 3.17×10⁶ t, among which 8.81×10⁵ t(the standard coal equivalence) can be used for energy production during 2008 to 2011. Grain straw was the main crop straw resources which occupying 90% of the total amount in which wheat and corn straw accounts for 98%. The biomass energy of crop straw resources in Weinan City was on the rise with fluctuations and its gravity center was moving towards the southwest gradually, but the movement speed became slow from 1978 to 2011. Based on the distribution of the straw resources, Weinan City was divided into the key development and utilization district(Linwei District, Dali and Fuping County), moderate development and utilization district(Pucheng, Heyang, Chengcheng County, Huaxian and Huayin City), the inappropriate district(Hancheng City, Tongguan and Baishui County). The biomass energy factory of the biomass energy of crop straw resources can be set between Dali and Pucheng County and should be next to Linwei District.