应用RGB图像分析的方法,研究了日本山口市街区生长的四照花(Comus kousa Buerg.)对2007年夏季干热多风的环境的响应。结果表明,许多四照花叶尖叶缘出现焦枯,清晰的暗棕色防护带显示在焦枯的叶片上。这些防护带逐渐从叶尖向叶基退缩直到成功控制焦枯为止,且留下许多不成功的防卫痕迹。焦枯的叶片呈现鲜明的逻辑斯蒂函数式变化趋势。依据气象数据分析,四照花叶片退缩型焦枯几乎与干燥峰值期同步。这表明在干燥度突然升高期间,极端的水分亏缺诱发了四照花的防卫反应,从而保护其余部分免于进一步的失水。像素分析结果表明,截止到2007年8月底四照花样树通过局部叶片退缩型焦枯减少了40.2%的叶面积。相比之下,鉴于上半年雨量充足,2008年,相同的样树只有13.2%叶面积减少。不管怎样,四照花的确削减了蒸腾表面积,并且表现出一种独特的蒸腾表面减少方式。既不同于落叶也不同于地上部枯死。依据脱水过程的分析,四照花在突然的干热胁迫下叶尖始发的干缩和叶片防卫反应的共同作用被认为是其蒸腾表面削减的关键所在。 Using the method of RGB image analysis, this paper studied the response of Comus kousa Buerg. Grown in the district of Yamaguchi, Japan, to dry, windy and windy summer 2007. The results showed that many of the leaf tips of many four-flowered leaves appeared scorched, and the clear, dark-brown protective bands appeared on the scorched leaves. These protective tapes gradually retreat from the tip to the leaf base until the scorch is successfully controlled, leaving many unsuccessful defensive marks. Scorching leaves showed a clear trend of Logistic function. According to the meteorological data analysis, four-leaf flower retarded scorch is almost synchronized with the dry peak period. This indicates that during a sudden increase in dryness, extreme water deficits induce a four-flowered defensive response, protecting the rest from further water loss. Pixel analysis showed that by the end of August 2007, the four-photo-like tree reduced leaf area by 40.2% through focal leaf-back scorch. In contrast, in the first half of the year, only 13.2% of the same sample trees were reduced in leaf area, due to sufficient rainfall in the first half of the year. In any case, Sihua indeed reduced the transpiration surface area, and showed a unique way to reduce the transpiration surface. Not only different from the leaves are also dead above ground shoots. According to the analysis of dehydration process, the synergistic effect of leaf stem defoliation and leaf defensive reaction under the sudden dry-heat stress is considered as the key point of transpiration surface reduction.