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通过林地穿透雨排除的方法模拟降雨减少,测定河南宝天曼自然保护区锐齿栎叶片光合色素含量与反射光谱的季节变化,对减雨处理造成的光合色素变化及其反射光谱的变化进行了定量分析,并探讨了水分控制条件下反射光谱对叶片光合色素变化的响应机制.结果表明:锐齿栎叶片的光合色素含量和色素比率均呈现明显的季节变化.减雨样地与对照样地叶片的光合色素含量和比率在生长季的各个时期存在差异,其中,叶片叶绿素b(Chl b)含量的差异显著,说明Chl b对减雨处理的敏感性最高,叶片类胡萝卜素(Car)含量的差异较小,说明Car对减雨处理的敏感性相对较弱.550 nm处的光谱反射率对色素季节变化的响应最敏感,以其构造的简单比值指数(SR_(750,550))与叶片Chl a、Chl b、总Chl和Car含量的正相关关系显著,光化学反射指数(PRI)与叶片Car/Chl的负相关关系显著.550 nm处的光谱反射率对减雨处理造成的色素变化响应最为敏感.SR_(750,550)对减雨处理造成的叶片Chl a、Chl b和总Chl的含量变化表现敏感(P<0.01),对Chl a/b的变化不敏感.PRI对减雨处理造成的叶片Car/Chl变化表现敏感(P<0.01).
Rainfall reduction was used to simulate rainfall reduction. The seasonal variation of photosynthetic pigment content and reflectance spectra of Quercus acutissima leaves in Baotianman Nature Reserve in Henan Province were measured. The changes of photosynthetic pigments and the changes of their reflectance spectra The quantitative analysis and the response mechanism of the reflectance spectrum to the change of photosynthetic pigments under the control of moisture were discussed.The results showed that the photosynthetic pigment content and pigment ratio of Quercus acutissima showed obvious seasonal changes.The rainfall- The photosynthetic pigment content and the ratio of leaf photosynthesis in different growth season were different, among them, the content of chlorophyll b (Chl b) was significantly different, indicating that Chl b had the highest sensitivity to rainfall treatment. The leaf carotenoids (Car) The results showed that the sensitivity of Car to rainfall-reducing treatment was relatively weak. The spectral reflectance at 550 nm was the most sensitive to the seasonal changes of pigment. Using simple ratio index (SR_ (750,550)) and leaf Chl a, Chl b, total Chl and Car content had a significant positive correlation, and the negative correlation between photochemical reflectance index (PRI) and leaf Car / Chl was significant.The spectral reflectance at 550 nm (750,550) were sensitive to changes of content of Chl a, Chl b and total Chl caused by rain reduction (P <0.01), but not to Chl a / b PRI was sensitive to changes of leaf Car / Chl caused by rain reduction (P <0.01).