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水肥耦合效应对楸树苗木叶片δ^13C的影响 预览 被引量:4

Coupling Effects of Soil Water and Fertilizer Application on Leaf δ^13C of Catalpa bungei Seedlings
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摘要 以楸树(Catalpa bungei)无性系004-1苗木为研究对象,采用三因素五水平二次回归通用旋转组合设计进行盆栽试验,通过测定6、7和8月份20个处理楸树苗木叶片碳同位素组成δ^13C、总氮含量和总磷含量,建立数学模型,分析土壤水分、施氮量和施磷量的主因子效应、单因素效应及其耦合效应对叶片δ^13C的影响,以及叶片碳同位素组成δ^13C与其总氮含量和总磷含量的关系。结果表明:(1)楸树苗木叶片δ^13C存在明显的月动态变化特征,总体上呈现出6月份高于7、8月份的趋势,20个处理苗木叶片δ^13C平均值(6~8月)变化范围介于-29.12‰~-26.60‰之间;(2)土壤水分对叶片δ^13C有显著负效应,施氮量对叶片δ^13C有显著正效应,并且施氮量主效应大于土壤水分主效应,但施磷量对叶片δ^13C无显著主效应;单因素效应分析表明,楸树苗木叶片δ^13C随土壤水分或施氮量的增加均呈先增加后减小的“抛物线型”关系;土壤水分×施N量对楸树苗木叶片δ^13C有显著耦合负效应,土壤水分和施氮量耦合效应图表明,叶片δ^13C随土壤水分降低、施氮量增加而逐渐增加;(3)6月、7月和8月份楸树苗木叶片δ^13C与其叶片总氮含量均呈显著正相关关系(P〈0.05;n=100),但叶片δ^13C与总磷含量无显著相关关系(P〉0.05;n=100)。研究认为,楸树苗木叶片碳同位素组成δ^13C随生长期表现出动态变化特征,它受到土壤水分、水氮耦合的显著负向影响,以及施氮量的显著正向影响,可以通过合理水肥配施措施大幅提高楸树苗木δ^13C。 By using rotatable central composite design(RCCD) for a pot experiment with three factors,five levels,twenty runs,we determined leaf δ^13C,nitrogen content(LN) and phosphorus content(LP) of Catal- pa bungei seedling(clone 004-1) under different treatments in June and July. Mathematical model was es- tablished for analysis of main factor effects,monofactor effects, and the combined effects of W(soil water), N(nitrogen) and P(phosphorus) on leaf δ^13C,also,LN and LP were correlated with leaf δ^13C. The results showed that: (1)monthly dynamic of leaf δ^13C of C. bungei seedlings was obviously found in the study,and the average leaf δ^13C(average measurements in June, July and August) of 20 treatments ranges from --29.12‰ to --26.60‰. (2)W had a significantly negative efirect on leaf δ^13C, and N had a significantly positive effect on leaf δ^13C, with a size sequence of N〉W, whereas P had no obvious effect on leaf δ^13C. Monofactor effects analysis results showed that the changes of leaf δ^13C with W or N increasing both showed a parabolic trend: first increasing and then decreasing. Interaction of W X N had obvious effect on leaf δ^13C of C. bungei seedling in July,but no significant effect on leaf δ^13C of C. bungei seedling in August. Moreover,the response surface on interaction between W and N indicated that leaf δ^13C increased gradually with W decreasing and N increasing. (3) Leaf δ^13C showed a significantly positive correlation with LN in July and August(P〈0.01;n=100), whereas the correlation between leaf δ^13C and LP was not significant (P〉0.05 n= 100). In general, leaf δ^13C of C. bungei seedling was observed to change dynamically along with the growth period,and be negatively affected by W and W)〈 N and positively affected by N, thus, it could be promoted by the rational method of irrigation and fertilizer application.
作者 邱权 李吉跃 王军辉 何茜 苏艳 马建伟 吴俊文 白晶晶 QIU Quan ,LI Jiyue,WANG Junhui,HE Qian,SU Yan, MA Jianwei ,WU Junwen ,BAI Jingjing ( 1 College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou 510642, China; 2 Research Institute of Forestry, Chinese Academy of Forestry, Key Laboratory of Tree Breeding and Cultivation, State Forestry Administra tion, Beijing 100091, China; 3 Xiaolongshan Forestry Science and Technology Research Institute, Tianshui, Gansu 741022, China)
出处 《西北植物学报》 CAS CSCD 北大核心 2015年第11期2290-2298,共9页 Acta Botanica Boreali-Occidentalia Sinica
基金 “十二五”农村领域国家科技计划课题(2012BAD21B03,2012BAD21B0304) 教育部博士点基金(20124404120008)
关键词 水肥耦合效应 碳同位素组成δ^13 C 叶片养分 数学模型 楸树 coupling effects of soil water and fertilizer application carbon isotope composition ( δ^13C) leafnutrients mathematical model Catalpa bungei
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