CAJ | 학술논문

设置对照（0 kg·hm－2·a－1）、低氮（30 kg·hm－2·a－1）、中氮（60 kg·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。
설치대조（0 kg·hm－2·a－1）、저담（30 kg·hm－2·a－1）、중담（60 kg·hm－2·a－1）3조모의대붕시험，연구료두중（Eucommia ulmoides）유묘재불동담침강처리하적광보향응특정。결과표명：두중유묘재저담처리하장세량호，기광보반사솔총체처우최저수평，홍변위치출현“홍이”추세，중담사득두중협편재가견광급근홍외파단적반사솔보편승고，병발생“람이”현상，두중생장수도억제，후기억제칙축점소제；담침강처리간적차이현저성광보구역수착시간적추이축점증다，도10월식물생장후기차이현저성개시강저；반고사모형삼수Rs、R0、λ0、λp화σ가작위반영두중수담침강영향정체수평적지표，기중 R0최위현저；여량개귀일화식피지수 NDVI 화gNDVI상비，비치식피지수RVI700화RVI550표현출경위유효적지시협박작용。
Experiments were conducted on spectral response characteristics of Eucommia ulmoides seedlings under different simulated nitrogen deposition like control (CK:0 kg/ha·a-1), low nitrogen (LN:30 kg/ha·a-1), medium nitrogen (MN:60 kg/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 gNDVI, RVI700 and RVI550 could better indicate stress of nitrogen.