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当前位置: 首页 > 文章 > 不同氮水平下棉花冠层NDVI分析与产量估测 农业机械学报 2014,45 (7) 231-236
Position: Home > Articles > Canopy NDVI Analysis and Yield Estimation for Cotton in Different Nitrogen Treatments Transactions of the Chinese Society for Agricultural Machinery 2014,45 (7) 231-236

不同氮水平下棉花冠层NDVI分析与产量估测

作  者：
李新伟;余炳凤;吕新;田敏;石宏刚
单  位：
石河子大学新疆生产建设兵团绿洲生态农业重点实验室
关键词：
棉花;冠层;归一化植被指数;氮水平;产量估测
摘  要：
以2011—2013年连续3个棉花生长季的田间试验数据为基础,利用GreenSeeker获取冠层归一化差值植被指数(NDVI),研究不同氮营养条件下棉花的产量变化、冠层NDVI值随施氮量和生育期的动态变化,以及NDVI与产量的相关性定量分析,建立基于NDVI的棉花产量估算模型。结果表明,生育期冠层NDVI值总体上呈"低-高-低"变化趋势。棉花4个生育期(盛蕾期、花期、盛铃期和初絮期)的NDVI值与产量的相关系数(r)分别为0.7137、0.847 9、0.897 9、0.692 6,在花期(P=0.003 4)、盛铃期(P=0.000 8)达到极显著正相关。经验证,NDVI能够估测关键生育期的产量,其中以盛铃期预测精度最高(R2=0.908 2,RSME为301.67 kg/hm2,RE为5.15%)。
译  名：
Canopy NDVI Analysis and Yield Estimation for Cotton in Different Nitrogen Treatments
作  者：
Li Xinwei;Yu Bingfeng;Lü Xin;Tian Min;Shi Honggang;Key Laboratory of Oasis Ecology Agriculture of Xinjiang Bingtuan,Shihezi University;
关键词：
Cotton Canopy NDVI Nitrogen treatments Yield estimation
摘  要：
The field experiment was carried out in three cotton growing seasons from 2011 to 2013.Cotton canopy normalized difference vegetation index( NDVI) was obtained by GreenSeeker at full-bud stage,flowering stage,full-boll stage,early-wadding stage. Yields,from different nitrogen application rates,were collected at harvest stage and compared with each other. Canopy NDVI,changing with nitrogen application level and growth period,were analyzed,separately. Furthermore,the correlation analysis was done between yield and canopy NDVI. Yield estimation models were established for cotton based on NDVI value. Results indicate that,in the four growth stages,with N rates increasing,canopy NDVI value presents a trend of "low-high-low". And the correlation coefficient between canopy NDVI and yield is 0. 713 7,0. 847 9,0. 897 9,0. 692 6,respectively,and significantly positive correlative at flowering stage( P = 0. 003 4) as well as full-boll stage( P = 0. 000 8). Regression between predicted yield and measured yield values of the year of 2013 shows that the correlation coefficient is maximum at full-boll stage( R2= 0. 908 2),and the root mean square error( RMSE) is 301. 67 kg /hm2,while the relative error( 5. 15%) is minimum. The results suggest that it is especially feasible to use canopy NDVI to estimate yield of cotton at the full-boll stage.

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