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测量了3个水淹深度(对照、根部水淹、全淹)条件下枫杨叶片的高光谱反射率、红边参数及对应的叶绿素总含量,对归一化植被指数与叶绿素总含量进行了相关分析.结果表明:①在水淹胁迫下,枫杨叶片的高光谱反射率呈现下降的趋势,且在蓝光波段(400~500 nm)和近红外波段(760~950 nm)表现为极显著差异;②随着水淹程度的加深,枫杨叶片叶绿素含量显著下降(p<0.05);③红边特征的分析显示,随着水淹程度的加深,叶片光谱出现了蓝移的现象,红边斜率呈现下降的趋势;④叶绿素总含量与归一化植被指数(R705/R750)呈正相关,相关系数为0.86(p<0.01).经回归分析,叶绿素总含量与归一化植被指数呈线性关系(R2=0.80,n=42).认为枫杨叶片高光谱特征及归一化植被指数可较好地反映枫杨的叶绿素含量和水淹胁迫的程度.
The hyperspectral reflectance, red edge parameters and total chlorophyll content of Pterocarya stenoptera under waterlogged conditions (control, root flooding and total flooding) were measured. The normalized vegetation index and total chlorophyll content were measured The results showed that: (1) Under waterlogging stress, the hyperspectral reflectance of Pterocarya stenoptera leaves showed a decreasing trend, and showed extremely significant in the blue (400-500 nm) and near infrared (760-950 nm) bands (P <0.05). (3) The analysis of red edge characteristics showed that with the deepening of waterlogging, the blue spectral shift of the leaf appeared, and the red (P <0.01) .The total chlorophyll content was positively correlated with the normalized vegetation index (R705 / R750) and the correlation coefficient was 0.86 (p <0.01) .The total chlorophyll content was linear with the normalized vegetation index (R2 = 0.80, n = 42) .High spectral characteristics and normalized vegetation index of Maple Leaf can reflect the chlorophyll content and the degree of flooding stress.