Dynamic model of vegetation indices for biomass and nitrogen accumulation in winter wheat
WU Ya-Peng, HE Li, WANG Yang-Yang, LIU Bei-Cheng, WANG Yong-Hua, GUO Tian-Cai, FENG Wei,*College of Agronomy/National Engineering Research Center for Wheat, Henan Agricultural University, Zhengzhou 450046, Henan, China
This study was supported by grants from the “Thirteenth Five-year Plan” of National Key Research Project of China.2016YFD0300604 the National Natural Science Foundation of China.31671624 the China Agricultural Research System.CARS-03-01-22
Abstract Using remote sensing technology to monitor and timely promote and control wheat growth in real time may improve the yield. In this study, the water-nitrogen coupling test was set up at different locations using a high yield cultivar Zhoumai 27. The suitable vegetation indices for monitoring above ground nitrogen uptake and biomass of winter wheat were selected and the dynamic models with preferred vegetation indices at different yield levels were established. The results showed that (1) different water-nitrogen coupling patterns significantly affected the canopy spectral changes of wheat, with the opposite characteristics at 350-700 nm and 750-900 nm; (2) The modified red-edge ratio (mRER), soil-adjusted vegetation index [SAVI (825, 735)], red edge chlorophyll index (CIred-edge) and normalized difference spectral index (NDSI) were the main vegetation indices sensitive to the two agronomic growth indices and with a good compatibility, and the stages well correlated with yield were from jointing to mid-filling; (3) the double Logistic model could fit the dynamic changes of vegetation index very well, and the fitting accuracy was higher at high and super high yield levels (R2 > 0.825), but lower at low yield level (R2 = 0.608-0.736). In comparison, CIred-edge and SAVI (825, 735) were more suitable for evaluating wheat growth. The results of this study are of great significance for evaluating crop yield faced on growing situation in the field, seedling management, and promoting or controlling plant growth according to classification in wheat production. Keywords:winter wheat;hyperspectral remote sensing;vegetation indices;yield;dynamic models
PDF (759KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 本文引用格式 吴亚鹏, 贺利, 王洋洋, 刘北城, 王永华, 郭天财, 冯伟. 冬小麦生物量及氮积累量的植被指数动态模型研究[J]. 作物学报, 2019, 45(8): 1238-1249. doi:10.3724/SP.J.1006.2019.81084 WU Ya-Peng, HE Li, WANG Yang-Yang, LIU Bei-Cheng, WANG Yong-Hua, GUO Tian-Cai, FENG Wei. Dynamic model of vegetation indices for biomass and nitrogen accumulation in winter wheat[J]. Acta Agronomica Sinica, 2019, 45(8): 1238-1249. doi:10.3724/SP.J.1006.2019.81084
W0: 不灌溉; W1: 拔节期灌溉一次; W2: 拔节期和开花期各灌溉一次。 Fig. 1Canopy spectral changes under different water and nitrogen treatments
W0: no irrigation; W1: irrigation once at jointing; W2: irrigation twice at jointing and anthesis. N0: 0; N6, 90 kg N hm-2; N12: 180 kg N hm-2; N18: 270 kg N hm-2; N24: 360 kg N hm-2.
AGNU: 地上部氮积累量; AGDW: 地上部生物量; 其他缩写同表1。 Fig. 2Comparison of vegetation indices with good relationships with nitrogen accumulation and biomass of wheat (n = 400)
AGNU: above ground N uptake; AGDW: above ground dry weight; other abbreviations are the same as those given in Table 1.
Table 2 表2 表2不同时期植被指数与小麦产量间线性决定系数(n = 50) Table 2Linear determination coefficients between vegetation indices and yield at different stages in wheat (n = 50)
植被指数 Vegetation index
越冬期 Wintering
返青期 Regreening
拔节期 Jointing
孕穗期 Booting
抽穗期 Heading
开花期 Anthesis
灌浆前期 Initial-filling
灌浆中期 Mid-filling
灌浆后期 Late-filling
mRER
0.005
0.454***
0.817***
0.815***
0.862***
0.800***
0.781***
0.669***
0.358***
CIred-edge
0.328***
0.604***
0.830***
0.825***
0.845***
0.829***
0.836***
0.681***
0.360***
NDSI
0.022
0.211***
0.681***
0.813***
0.871***
0.807***
0.827***
0.739***
0.592***
SAVI (825, 735)
0.325***
0.649***
0.825***
0.833***
0.876***
0.847***
0.867***
0.736***
0.341***
***表示 P < 0.001显著水平。缩写同表1。***: significant at P < 0.001. Abbreviations are the same as those given in Table 1.
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