降雨利用量与糖料蔗灌溉定额耦合效应分析

Analysis of Rainfall Amount and the Coupling Effect of Irrigation Quota of Sugar Cane

为了研究广西糖料蔗天然降雨利用量与非充分灌溉定额耦合利用和仅利用天然降雨灌溉分别对糖料蔗生长带来不同的影响,通过查阅广西桂南、桂中、桂北的降水资料对广西主要蔗区降雨特性进行分析,并采取了固定灌水次数、固定灌水时期、固定灌水定额的方法对代表主要蔗区的南宁市武鸣等7个县进行试验,再根据对试验区试验研究的糖料蔗需水量及需水规律,绘制出试验区糖料蔗需水量、天然降雨利用量和补充灌水量过程线,显示出广西糖料蔗全生育期3-12月(10个月)降水量在时间上差别较大,缺水时间多,缺水量大,除桂南7月份降水特性能满足糖料蔗生长需水量和砍收前20d不补充灌溉,其他8个月都需要补充灌溉。结果表明耦合天然降雨利用量与非充分灌溉定额的灌溉对糖料蔗产生的效应比仅利用天然降雨灌溉十分显著。

In order to study the Guangxi sugar cane natural rainfall utilization and non full irrigation quota and irrigation coupling using only natural rainfall on sugarcane growth have different effects,through access to Guangxi southern Guangxi,Guangxi,Northern Guangxi rainfall data to analyze rainfall characteristics of main sugarcane areas of Guangxi,and take a fixed number of irrigation fixed period,fixed irrigation,irrigation quota of main sugarcane area representative of Nanning city seven counties in Wuming were tested,according to the experimental research on the test area of sugar cane water requirement and water requirement law,draw the test area of sugar cane,water requirement of natural rainfall utilization and supplementary irrigation process line,show Guangxi sugar cane in the whole growth period of 3-12months（10months）of precipitation in time difference,lack of time,a large amount of water,in addition to the precipitation characteristic of southern Guangxi in July to meet the growing need of water and sugar cane harvesting without supplemental irrigation 20 days before,need other supplementary irrigation for 8 months.The results showed that the utilization of natural rainfall coupled with non sufficient irrigation quota of irrigation of sugar cane to produce effect than only by natural rainfall and irrigation is very significant.