柳州市甘蔗生长季内水分供求情况分析

Analysis of Water Supply and Demand in Sugarcane Growing Season in Liuzhou City

利用柳州市8个气象站1961—2014年的气象资料,在考虑甘蔗作物系数的基础上采用彭曼公式计算甘蔗需水量,结合生长季内的降水情况,分析柳州市甘蔗水分的供求情况。结果表明,甘蔗在幼苗期和分蘖期水分盈余,水分亏缺情况主要发生在伸长期后期和成熟期,其中以伸长期后期最为显著;柳州市甘蔗生长季内降水中心主要集中在融安县、融水县一带,南部降水偏少而甘蔗需水量较大,是水分亏缺的主要地区,干旱风险最大,可为有关部门制定甘蔗的防旱减灾对策时提供科学依据。

The meteorological data of 8 meteorological stations in Liuzhou were collected.In consideration of sugarcane crop coefficient the water requirement of sugarcane were calculated by Penman formula.Then,the water supply and demand of sugarcane in Liuzhou was analyzed in combination with precipitation in the growing season.The results showed that sugarcane was in water surplus in the seedling stage and the tillering stage,while the water deficit occurred mainly in the extended and mature stage,which was the most significant in the later period of extended stage.The precipitation center in the growing season of sugarcane was mainly concentrated in the area of Rongan and Rongshui in Liuzhou.Precipitation was less while the water requirement was larger in the south of study area.The south of study area was the main district of water deficit which took a high drought risk.The results can provide a scientific basis for the relevant departments in formulating drought prevention and mitigation measures for sugarcane.