干旱区生态环境知识资源中心(Arid): 利用碳同位素分辨率表征沟灌番茄水分利用效率

Arid

	利用碳同位素分辨率表征沟灌番茄水分利用效率
其他题名	Stable carbon isotope discrimination on water use efficiency of field tomato under furrow irrigation
	魏镇华; 杜太生; 张娟; 徐淑君
来源期刊	农业工程学报
ISSN	1002-6819
出版年	2013
卷号	29 期号:7 页码:58-65
中文摘要	为了进一步探索沟灌条件下作物水分利用效率提升机理,利用稳定碳同位素对水分利用效率(WUE)的指示特性,研究了隔沟交替灌溉(AFI)和常规沟灌(CFI)条件下大田番茄不同部位碳同位素分辨率(Delta~(13)C)与叶片和产量水平水分利用效率的关系。研究结果表明:不同沟灌条件下果实成熟期的叶片碳同位素分辨率(DeltaL)、果实碳同位素分辨率(DeltaF)分别为19.27~20.25和18.07~20.04,DeltaL与叶片水平瞬时水分利用效率(WUE_i)、内在水分利用效率(WUE_n)均呈负相关,且DeltaL对WUE_n的指示性优于WUE_i。DeltaL、DeltaF均与产量水平水分利用效率(WUE_(ET))呈负相关。AFI条件下DeltaL与WUE_n、WUE_(ET)的相关性较CFI更为显著,沟灌条件下果实成熟期的叶片碳同位素分辨率可作为表征作物WUE的量化指标。
英文摘要	Carbon isotope discrimination value (Delta13C) was an integrative reflection to the rate of intercellular CO2 concentration(Ci) and air CO2 concentration (Ca) in a period, and Ci/Ca suggested a relative amount of photosynthetic rate (Pn) and stomatal conductance (gs) corresponding to CO2 demand and supply respectively, and then Ci/Ca would change significantly and affect the water use efficiency (WUE) ultimately with the variation of Pn or gs, which had the same impact factor with stable carbon isotope composition in crops. Delta13C and carbon isotope ratio (delta13C) could characterize the WUE during the entire life period of crops. Furthermore, the measurement for delta13C of different parts in crops could reflect cumulative WUE at different time scales, thus overcoming the limit of any other methods that could just measure instantaneous WUE at a time scale only. Therefore, Delta13C could well reflect water use efficiency at yield level (WUEET), and be used to infer instantaneous water use efficiency (WUEi) and intrinsic water use efficiency(WUEn) at leaf level, which was recognized as a reliable way to estimate the crop WUE at a long term. The current research on indicating the relationship between Delta13C of crop tissue and crop WUE were mainly focused on crops such as wheat, rice, sugar beet and maize under a water deficit, and less on tomatos under alternate partial root-zone furrow irrigation (AFI) and conventional furrow irrigation (CFI). In order to further investigate the water use mechanism on different parts of crops under different furrow irrigation, this research combined theoretical analysis with field experiments, integrating WUE research on different scales through carbon isotopes instruction on WUE, then analyzed the relationship between different parts of Delta13C in tomato with WUE at different scales to further explain the water use process and transferring rule in crops different parts under partial root-zone irrigation. The experiment was carried out at the Experimental Station of Crop Efficient Water Use, Ministry of Agriculture in Wuwei city, Gansu province from May to September in 2011 and 2012 respectively. Leaf carbon isotope discrimination (DeltaL), fruit carbon isotope discrimination (DeltaF) values, and soil moisture, Pn, transpiration rate (Tr), gs, yield were measured and WUEi, WUEn, WUEET values were calculated. The results indicated that: DeltaL, DeltaF value was between 19.27 and 20.25, 18.07 and 20.04 respectively under different furrow irrigation in the fruit maturation period in 2011 and 2012. The DeltaL value was significantly greater than DeltaF value, indicating leaf carbon isotope discrimination was more sensitive to the response on different irrigation methods and irrigation quotas than fruit carbon isotope discrimination. DeltaL showed a negative relationship with WUEi and WUEn respectively. Furthermore, DeltaL showed a better indicating capacity on WUEn than WUEi under different furrow irrigation in the fruit maturation period, DeltaL was significantly negative related with WUEn (R = -0.977, P<0.01) under the alternate partial root-zone furrow irrigation. DeltaF had a better negative correlation with yield than DeltaL. DeltaL and DeltaF both showed a negative relationship with WUEET. DeltaL showed more significant correlation with WUEET and WUEn under AFI than CFI, indicating that AFI could regulate the photosynthetic capacity and improve water use efficiency more effectively and better reflect DeltaL indicating capacity on WUE at different levels. In conclusion, using different tomato tissue Delta13C values to indicate WUE at different levels has a certain feasibility under different furrow irrigation in the northwest inland arid region, and also the leaf and fruit Delta13C values measured during the period of maturity can be a quantitative indicator to characterize accumulative WUE at leaf and yield levels of field tomato under furrow irrigation.
中文关键词	灌溉 ; 碳 ; 同位素 ; 分辨率 ; 水分利用效率指示 ; 番茄
英文关键词	irrigation carbon isotope discrimination water use efficiency indication tomato
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURAL ENGINEERING
WOS研究方向	Agriculture
CSCD记录号	CSCD:4820699
来源机构	中国农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/229880
作者单位	中国农业大学中国农业水问题研究中心, 北京 100083, 中国
推荐引用方式 GB/T 7714	魏镇华,杜太生,张娟,等. 利用碳同位素分辨率表征沟灌番茄水分利用效率[J]. 中国农业大学,2013,29(7):58-65.
APA	魏镇华,杜太生,张娟,&徐淑君.(2013).利用碳同位素分辨率表征沟灌番茄水分利用效率.农业工程学报,29(7),58-65.
MLA	魏镇华,et al."利用碳同位素分辨率表征沟灌番茄水分利用效率".农业工程学报 29.7(2013):58-65.