模拟氮沉降下杜仲幼苗的光谱响应  

Spectral Response of Eucommia ulmoides Seedlings to Simulated Nitrogen Deposition

作　　者：哀建国[1] 杜江丽[2] 金松恒[1] 宋新章[2] 

机构地区：[1]浙江农林大学天目学院,浙江临安311300 [2]浙江农林大学林业与生物技术学院,浙江临安311300

出　　处：《浙江林业科技》2014年第6期72-77,共6页Journal of Zhejiang Forestry Science and Technology

基　　金：浙江省自然科学基金资助项目(Y3110393)

摘　　要：设置对照(0kg·hm-2·a-1)、低氮(30kg·hm-2·a-1)、中氮(60kg·hm-2·a-1)3组模拟大棚试验,研究了杜仲(Eucommia ulmoides)幼苗在不同氮沉降处理下的光谱响应特征。结果表明:杜仲幼苗在低氮处理下长势良好,其光谱反射率总体处于最低水平,红边位置出现"红移"趋势,中氮使得杜仲叶片在可见光及近红外波段的反射率普遍升高,并发生"蓝移"现象,杜仲生长受到抑制,后期抑制则逐渐消除;氮沉降处理间的差异显著性光谱区域随着时间的推移逐渐增多,到10月植物生长后期差异显著性开始降低;反高斯模型参数Rs、R0、λ0、λp和σ可作为反映杜仲受氮沉降影响整体水平的指标,其中R0最为显著;与两个归一化植被指数NDVI和gNDVI相比,比值植被指数RVI700和RVI550表现出更为有效的指示胁迫作用。Experiments were conducted on spectral response characteristics of Eucommia ulmoides seedlings under different simulated nitrogen deposition like control（CK： 0kg/ha·a^-1）, low nitrogen（LN： 30kg/ha·a^-1）, medium nitrogen（MN： 60kg/ha·a^-1）. The result showed that the seedlings grew well under low nitrogen treatment, with the lowest spectral reflectance, and the red edge position presented a trend of ＂red shift＂. While the spectral reflectance in visible light and near infrared band of seedlings under medium nitrogen deposition was generally higher, and the ＂blue shift＂ phenomenon occurred, consequently, the growth of seedlings was restrained but grew well later. The spectral regions of significant difference among different treatments increased with time, while in October, differences reduced. The inverted-Gaussian model parameters such as Rs, R0, λ0, λp and σ could be indicators of spectral response of seedlings under simulated nitrogen deposition, among which, R0 performed the best. Compared with NDVI and g NDVI, RVI700 and RVI550 could better indicate stress of nitrogen.

关 键 词：杜仲 模拟氮沉降 光谱反射率 红边 

分 类 号：S718.43[农业科学—林学]