草业学报Issue(3)：195-203,9.DOI:10.11686/cyxb20150320
不同密度短星翅蝗危害后羊草的高光谱变化及对产草量的影响
The effects of hyper spectral change on grassland biomass after damage by Callipta-mus abbreviates populations of different densities
摘要
Abstract
In order to evaluate grassland loss caused by Calliptamus abbreviates ,a study has been undertaken to establish the correlation between the Normalized Difference Vegetation Index (NDVI)of Leymus chinensis grassland,as measured with a high resolution radiometer,and the density of C.abbreviates populations.Five groups of C.abbreviates with densities of 5,10,20,40 and 60 heads/m2 were used to simulate the damage caused by locusts feeding in the field.NDVI was measured after different damage periods and losses caused by the locusts were calculated using a regression model of NDVI and grassland biomass.Results indicated that NDVI decreased with increases in locust density.However,at a density of 10 heads/m2 the NDVI rose slight-ly.The regression equations of NDVI and locust density under different damage periods were:y =0.5932 +0.0014x -6.93×10 -5 x 2 (5 days),y =0.5950-4.8500×10 -4x -4.01×10 -5 x 2 (10 days),y =0.5848-0.0024 x -1.61×10 -5 x 2 (15 days)and y =0.6422-0.0031x -2.12×10 -5 x 2 (20 days);where y represents the NDVI score and x locust density.The study found that in the case of low densities (less than 20 heads/m2 )the dam-age caused by C.abbreviates had no obvious effect on NDVI with the extension of damage time.However,un-der high densities (more than 20 heads/m2 )the NDVI decreased rapidly.The regression model (y =614.15x -119.28)shows that NDVI data can be used to measure grassland loss.The study indicated that low densities of C.abbreviates (5 and10 heads/m2 )had significantly less effect on L.chinensis grassland but that when locust density reached 40 heads/m2 the biomass decreased sharply.Results thus showed that the hyper spectral grass-land vegetation index (NDVI)and the damage caused by locust density are significantly correlated.The spec-tral change caused by locust damage can thus be used to estimate both the density of locusts and the extent of grassland loss.This research provides a foundation of further large-scale grassland monitoring with hyper spec-tral remote sensing.关键词
短星翅蝗/羊草/归一化植被指数(NDVI)Key words
Calliptamus abbreviatus/Leymus chinensis/NDVI引用本文复制引用
赵凤杰,王正浩,王慧萍,吴惠惠,刘航玮,王广君,张泽华..不同密度短星翅蝗危害后羊草的高光谱变化及对产草量的影响[J].草业学报,2015,(3):195-203,9.基金项目
公益性行业（农业）科研专项经费资助（201003079）和现代农业产业技术体系建设专项资金（CARS-35-07）资助。 （）
