The dynamic simulation of rice growth parameters under cadmium stress   with the assimilation of multi-period spectral indices and crop model

doi:10.1016/j.fcr.2015.08.004

CORC > 北京大学 > 地球与空间科学学院

	The dynamic simulation of rice growth parameters under cadmium stress with the assimilation of multi-period spectral indices and crop model
	Liu, Feng ; Liu, Xiangnan ; Ding, Chao ; Wu, Ling
刊名	FIELD CROPS RESEARCH
	2015
关键词	Growth parameters Dynamic simulation Assimilation Spectral indices Crop growth model Cadmium stress SENSING DATA ASSIMILATION LEAF-AREA INDEX VEGETATION INDEXES PRECISION AGRICULTURE RIVER FLOODPLAINS WOFOST MODEL HEAVY-METAL ACCUMULATION REFLECTANCE YIELD
DOI	10.1016/j.fcr.2015.08.004
英文摘要	Obtaining precise information regarding the levels of heavy metal stress in crops is vital for food security, agricultural production, and ecological protection. In this study, we realized the dynamic simulation of rice growth parameters in three experiment fields that were exposed to varying levels of soil Cd (cadmium) concentration, intending to monitor the stress-induced changes of growth parameters on time scale. To simulate the growth parameters Leaf Area Index (LAI), Weight of Storage Organs (WSO) and Total Above Ground Production (TAGP) more accurately, we imbedded a Cd stress factor f(cd) into the initial World Food Study (WOFOST) model. Then, as the spectral sensing technology is a potentially promising method to monitor crop stress conditions, an optimized methodology of assimilating multi-period spectral indices into the coupled WOFOST + PROSPECT + SAIL model was adopted to obtain the optimum value of stress factor; next, the dynamic simulation of growth parameters was adjusted. Particularly, based on the specific sensibility to contamination levels at different growth stages, TCARI (Transformed Chlorophyll Absorption in Reflectance Index), REP (Red Edge Position) and RH (Reflectance Height) were selected as the multi-period spectral indices, serving as the compared targets of the cost function in the process of assimilation. The growth parameters simulated by the modified WOFOST model preferably reflected the variations of rice growth status on a time scale with R-2 over 94% at all of the three levels. This study indicates that the optimized methodology of assimilating multi-period spectral indices into the crop model is applicable for simulating growth parameters under Cd stress, which provides a reference for dynamically monitoring heavy metal contamination in farmland environments. (C) 2015 Elsevier B.V. All rights reserved.; National Natural Science Foundation of China [41371407]; Fundamental Research Funds for the Central Universities [35732015025]; SCI(E); ARTICLE; liufeng1402@163.com; liuxn@cugb.edu.cn; dc@cugb.edu.cn; wl_19830807@sohu.com; 225-234; 183
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/415482]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Liu, Feng,Liu, Xiangnan,Ding, Chao,et al. The dynamic simulation of rice growth parameters under cadmium stress with the assimilation of multi-period spectral indices and crop model[J]. FIELD CROPS RESEARCH,2015.
APA	Liu, Feng,Liu, Xiangnan,Ding, Chao,&Wu, Ling.(2015).The dynamic simulation of rice growth parameters under cadmium stress with the assimilation of multi-period spectral indices and crop model.FIELD CROPS RESEARCH.
MLA	Liu, Feng,et al."The dynamic simulation of rice growth parameters under cadmium stress with the assimilation of multi-period spectral indices and crop model".FIELD CROPS RESEARCH (2015).