长江流域5个地区间苎麻产量差异的气候影响因素分析

目的]探讨影响苎麻生态区域适应能力的气候因素。方法]在长江流域苎麻主产区选取5个不同生态区域分别作为试验点,考察了中苎2号的产量,并依据苎麻产量高低衡量了中苎2号对各生态区域的适应能力,最后分析了导致苎麻适应性差异的气候因素。结果]各试验点产量差异较大,最高和最低产量差异达到2.3kg/20m2,且这一结果在2年试验中可以很好的重复。结合各生态区域的气候因子分析发现,中苎2号产量与其生长期间降水量、日照时间和相对湿度均呈显著相关性,其中长江流域不同生态区域日照时间和降水量可对中苎2号起到增产作用,而相对湿度则会对中苎2号起到减产作用。结论]环境气候因子降水量、日照时间和相对湿度差异是导致苎麻在长江流域不同生态区域适应性差异的一个重要因素。

Analysis of Climatic Factors Causing Yield Difference in Ramie among Different Eco-regions of Yangtze Valley

Objective] This study was to investigate the climatic factors affecting the regional eco-adaptability of ramie.Method] Five experimental sites of different eco-types in ramie growing regions in Yangtze Valley were set up to investigate the yield of Zhongzhu No.2,based on which we assessed the adaptability of Zhongzhu No.2 to various eco-regions and further analyzed the climatic factors causing the difference in eco-adaptability.Result] Ramie yield varied largely among various experimental sites and the yield difference appeared to be well repeatable,with a differential value between the maximum and the minimum reaching 2.3 kg/20 m2.Analysis of the yield data,together with climatic factors in various ecological regions showed that yield of Zhongzhu No.2 was significantly correlated with rainfall,sunshine hours,relative humidity during its growing period.Of the climatic factors,sunshine hours and rainfall can positively promote yield increase,while relative humidity negatively regulate ramie yield.Conclusion] The climatic indices,including rainfall,sunshine duration and relative humidity are a key factor causing yield difference in ramie among different regions of Yangtze Valley.