草业学报2011，Vol.20Issue(3)：239-244,6.
施氮水平对多花黑麦草植株氮含量及反射光谱特征的影响
Plant nitrogen content of annual ryegrass and spectral reflectance response to nitrogen application level
摘要
Abstract
Plant nitrogen content was a vital indicator to evaluate pasture growing situations, to estimate production and to determine optimal fertilizer application. An experiment was conducted to investigate the plant nitrogen content of annual ryegrass and the characteristics of canopy spectral reflectance under five nitrogen levels, exploring the relationship between plant canopy reflectance and nitrogen content. The nitrogen level had a significant impact on the plant nitrogen content of annual ryegrass and when nitrogen fertilizer increased from 100 to 400 kg/ha the plant nitrogen content increased accordingly. In the visible region, canopy spectral reflectance rate reduced as nitrogen level increased. There was significant negative correlation between plant nitrogen content and single-band reflectance rate and the absolute value of the correlation coefficient was greater than 0.5 (P＜0.01) within 487-718 nm. The optimalmodel of plant nitrogen content estimation by using sensitive bands was y+4. 362-0. 754x579 ＋0. 351x700, and the optimal model of plant nitrogen content estimation based on vegetation index was y=3. 026-0. 670DVI(610,487) +4. 997NDVI(700,579). A strong correlation between estimated and true value of plant nitrogen content was detected (P＜0.01).关键词
多花黑麦草/敏感波段/植被指数/植株氮含量/冠层反射光谱Key words
annual ryegrass(Lolium multiflorum)/ sensitive band/ vegetation index/ plant nitrogen content/canopy spectral reflectance分类
农业科技引用本文复制引用
杨红丽,陈功,吴建付..施氮水平对多花黑麦草植株氮含量及反射光谱特征的影响[J].草业学报,2011,20(3):239-244,6.基金项目
云南省自然科学基金项目(2004C0038M)资助. （2004C0038M）
