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不同烤烟种植模式的物质流、能量流及价值流分析
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摘要
确定合理的种植模式对提高烟田生态系统的生产效率,促进烟草农业的可持续发展十分重要。以皖南地区4种典型烤烟种植模式为研究对象,采取田间调查分析的方法,从农田生态系统的物质流、能量流和价值流角度研究了不同烤烟种植模式的氮磷钾投入产出、投能结构和价值转换及其数量特征。研究结果表明,各烤烟种植模式均需调控氮、磷肥的施用量及其肥料结构,提高其利用率,并在各烤烟轮作模式中重视钾肥施用及秸秆还田管理。在各作物中种植烤烟的有机能和无机能之比最高(0.71),且其投能组成中人力能最高,其次是化肥能及农机能。烟稻复种连作的T1模式其能量产投比最低,而烤烟轮作的T2模式最高。虽然T1模式的经济纯收入最高,但从价值产投比和物质及能量的高效利用角度综合考虑,烤烟—水稻→小麦—水稻→烤烟的2年轮作种植模式为皖南地区较优的烤烟种植模式,后续可进一步推广应用。
The reasonable choice of tobacco planting pattern is very important to improve the efficiency of tobacco field ecosystem and to promote the sustainable development of tobacco modern agriculture. In this study, the materials, energy and value flow characters of four tobacco planting patterns in Southern Anhui area were investigated, and the NPK input and output status, energy structure and value conversion efficiency were analyzed and discussed based on field investigation. The results showed that in all the planting patterns there was a need for decreasing the amounts of N, P fertilizers and increasing the fertilizer application efficiency. Meanwhile, the K fertilizer application and straw returning should be emphasized in the three tobacco rotation patterns. The ratio of organic energy to inorganic energy was the highest(0.71) in tobacco planting among all the studied crops planting, and the labor energy was the highest among the energy components. The fertilizer energy and agricultural machinery energy was the second. The tobacco-rice multiple cropping had the lowest of energy ratio of output to input, and the planting pattern of tobacco-rice→wheat-rice→tobacco had the highest value in the four tobacco planting patterns. Moreover, the tobacco-rice multiple cropping pattern had the highest net income per hectare, but the planting pattern of tobacco-rice→wheat-rice→tobacco in two years was the best of four planting patterns from the perspective of ratio of nutrients input to output, energy efficient utilization and the ratio of value input to output. The later should be promoted in a larger area in the Southern part of Anhui Province.
引文
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