不同氮素水平下107杨光谱及光合响应特征研究  

Hyperspectral response and light response of the Populus×euramericana‘Neva'under different nitrogen nutrition levels

作　　者：王鑫梅 牟洪香[1] 杨可伟[1] 赵雪[1] 孙晓[1] 程志庆[2] 王鹤松[3,4] 

机构地区：[1]河北农业大学林学院,河北保定071000 [2]中国林业科学研究院,北京100083 [3]北京林业大学林学院,北京100083 [4]中国科学院大气物理研究所,北京100029

出　　处：《南京林业大学学报（自然科学版）》2016年第3期70-74,共5页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：国家林业公益性行业科研专项项目(201204105);国家自然科学基金项目(41105076)

摘　　要：为科学制定107杨（Populus×euramericana‘Neva’）氮肥管理措施,研究了不同氮素水平下1年生107杨盆栽苗光谱及光合响应特征。结果表明：1不同氮素水平下107杨光谱反射曲线的变化趋势基本一致,且均有绿色植物典型的＂谷＂和＂峰＂的特征;在不同的施氮量梯度下,随着施氮量的增加,高光谱反射率一阶导数也相应地升高,其在680-760 nm的红边区域具有明显的向长波方向移动的趋势,其中以N-4（4 g）氮素处理表现最为明显;2在不同的施氮量梯度下,随着光照强度增加,107杨叶片的净光合速率（P_n）、蒸腾速率（T_r）和气孔导度（G_s）明显增加,而胞间CO_2浓度（C_i）降低。所有处理中以N-4（4g）处理叶片的光合能力最强,生长发育状况最佳。In order to provide a theoretical foundation for nitrogen fertilizer management of Populus×euramericana ‘Neva＇seedlings,the effects of nitrogen treatments on the hyperspctral and light-response curves of P. euramericana‘Neva＇annual seedlings were studied. The results showed that： 1 Spectral reflectance curves of P. euramericana ‘Neva＇at the different nitrogen levels were almost the same. The curves would all possess typical＂valley＂and ＂peak＂characteristics of green plants. In different nitrogen levels,hyperspectral reflectance first derivative increased with the increase of nitrogen and it had obvious trend of moving to long wavelength in the red edge region of 680-760 nm.2 Under different nitrogen levels,the net photosynthetic rate,transpiration rate and stomatal conductance of P. euramericana ‘Neva＇leaf increased sharply whereas intercellular carbon dioxide concentration of that decreased with the increase of light intensity.The photosynthetic capacity and optimal growth conditions of N- 4（ 4 g） treatment leaf were the best among the treatments.

关 键 词：107杨 氮素 光谱反射率 光响应曲线 净光合速率 

分 类 号：S792.119[农业科学—林木遗传育种]