干旱区生态环境知识资源中心(Arid): Predicting the Rooting Depth, Dynamic Root Distribution and the Yield of Sunflower under Different Soil Salinity and Nitrogen Applications

Arid

DOI	10.1016/j.indcrop.2021.113749
	Predicting the Rooting Depth, Dynamic Root Distribution and the Yield of Sunflower under Different Soil Salinity and Nitrogen Applications
	Ma, Tao; Zeng, Wenzhi; Lei, Guoqing; Wu, Jingwei; Huang, Jiesheng
通讯作者	Zeng, WZ (corresponding author), Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Peoples R China.
来源期刊	INDUSTRIAL CROPS AND PRODUCTS
ISSN	0926-6690
EISSN	1872-633X
出版年	2021
卷号	170
英文摘要	Soil salinity is a major abiotic stress affecting crop production in arid and semi-arid regions, and nitrogen (N) is the main yield-limiting nutrient in most agroecosystems. To find out the effects of different soil electrical conductivity (EC) and N application rates on sunflower (Helianthus annuus L.) rooting depth, dynamic root distribution and its yield, a three-year field experiment was conducted from 2015 to 2017 in Hetao Irrigation District, China. The experiment consisted of three initial salinity (IS) levels expressed as the EC of a saturated soil extract (ECe) (S0: ECe < 3 dS m(-1); S1: 3< ECe 6 dS m(-1); S2: ECe 6 dS m(-1)) and five N rates (45, 90, 135 180 and 270 kg N ha(-1)), referred as N0, N1, N2, N3 and N4 rates, respectively. The dynamics of sunflower root growth was in-situ monitored by minirhizotrons and revealed flexibility in its distribution among different treatments. Salt stress obviously decreased root penetration in the seedling stage, while it accelerated root elongation below 28.6 cm depth after bud initiation and prolonged its active development to later stages. In particular, the highest fine root length density (FRLD) of S2N1 and S2N3 were rapidly increased to 5.27 and 6.44 cm cm-3 before anthesis, respectively, which were more than three folds of those at S0 and S1 levels. Meanwhile, the N3 rate in this study obviously aggravated salt stress and accelerated sunflower root senescence at S2 level, but it could promote root vertical development after anthesis. In addition, our study proposed a dynamic root distribution model in saline fields (DRD-SF) to predict the dynamics of FRLD distribution based on IS levels, effective nitrogen application (ENA) and the observed leaf area index (LAI) at different growth time. The data in 2015 and 2017 were used to validate our model developed from 2016 data, demonstrating acceptable simulation of the flexible distribution of sunflower fine roots under the interactions of different IS levels and N rates. Moreover, this study also associated sunflower canopy development with yield production, by proposing a yield response function in the form of bivariate quadratic polynomial (r(2) = 0.913, RMSE (root mean squared error) = 539.8 kg/ha) using the ENA and the maximum LAI (LAI(max)) as two inputs. This work will be helpful for evaluating the potential of crop root development and yield production under different N rates in saline fields.
英文关键词	Sunflower salinity nitrogen rooting depth fine root distribution seed yield
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000690615700002
WOS关键词	WATER-UPTAKE ; SALT TOLERANCE ; DENSITY DISTRIBUTION ; BIOMASS ALLOCATION ; RESPONSE FUNCTIONS ; USE EFFICIENCY ; GROWTH ; STRESS ; WHEAT ; MODELS
WOS类目	Agricultural Engineering ; Agronomy
WOS研究方向	Agriculture
来源机构	河海大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/363582
作者单位	[Ma, Tao] Hohai Univ, Coll Agr Sci & Engn, Nanjing 210098, Peoples R China; [Ma, Tao; Zeng, Wenzhi; Lei, Guoqing; Wu, Jingwei; Huang, Jiesheng] Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Peoples R China
推荐引用方式 GB/T 7714	Ma, Tao,Zeng, Wenzhi,Lei, Guoqing,et al. Predicting the Rooting Depth, Dynamic Root Distribution and the Yield of Sunflower under Different Soil Salinity and Nitrogen Applications[J]. 河海大学,2021,170.
APA	Ma, Tao,Zeng, Wenzhi,Lei, Guoqing,Wu, Jingwei,&Huang, Jiesheng.(2021).Predicting the Rooting Depth, Dynamic Root Distribution and the Yield of Sunflower under Different Soil Salinity and Nitrogen Applications.INDUSTRIAL CROPS AND PRODUCTS,170.
MLA	Ma, Tao,et al."Predicting the Rooting Depth, Dynamic Root Distribution and the Yield of Sunflower under Different Soil Salinity and Nitrogen Applications".INDUSTRIAL CROPS AND PRODUCTS 170(2021).