Study on the Photosynthetic Characteristics of Bothriochloa ischaemum under Different Water and Nutrient Conditions Ⅱ. Light-Response Curve

doi:10.11733/j.issn.1007-0435.2010.06.005

›› 2010, Vol. 18 ›› Issue (6): 773-779.DOI: 10.11733/j.issn.1007-0435.2010.06.005

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Study on the Photosynthetic Characteristics of Bothriochloa ischaemum under Different Water and Nutrient Conditions Ⅱ. Light-Response Curve

XU Wei-zhou¹, XU Bing-cheng^1,2, DUAN Dong-ping¹, NIU Fu-rong¹

1. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling, Shaanxi Province 712100, China;
2. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi Province 712100, China

Received:2010-03-26 Revised:2010-10-27 Online:2010-12-15 Published:2010-12-15

不同水肥条件下白羊草光合生理生态特征研究Ⅱ.光响应曲线

徐伟洲¹, 徐炳成^1,2, 段东平¹, 牛富荣¹

1. 西北农林科技大学, 黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西, 杨凌, 712100;
2. 中国科学院水利部水土保持研究所, 陕西, 杨凌, 712100

通讯作者: 徐炳成,E-mail:Bcxu@ms.iswc.ac.cn
作者简介:徐伟洲(1985- ),男,陕西蓝田人,硕士研究生,研究方向为植物生理生态适应性,E-mail:wei_zhou7758@163.com
基金资助:
中国科学院重要方向项目(KZCX2-YW-QN412);西北农林科技大学基本科研业务费专项(QN2009079B01);教育部留学回国人员科研启动基金资助

Abstract

Abstract: In order to study the photo-physiological characteristics of old world bluestem(Bothriochloa ischaemum L.Keng.) from loess hilly-gully region under different water and nutrient supplies,the photosynthesis-light response curves(P_n-PAR)were determined under potted conditions with two water treatments(HW-80%FC and LW-40%FC)and three nutrient treatments(CK,P and NP).Results indicte that the photosynthesis-light response curves of old world bluestem was more appropriate to a non-rectangular hyperbolic model.NP treatment improved maximum net photosynthetic rate(P′_max),decreased dark respiration rate(R_d),maintained more lower light compensation point(LCP)and more higher light saturation point(LSP)under adequate water supply condition,which enhanced the ability to light adaptation and increased the potential photosynthesis of old world bluestem.Under water stress condition,P treatment significantly improved P′_max,together with a apparently elevated quantum efficiency(a)and LSP,which suggested that the P nutrient can improve photosynthetic capacity of old world bluestem under water stress.

Key words: Bothriochloa ischaemum, Photosynthesis-light response curve, Nitrogen and phosphorus, Water stress

摘要： 为揭示黄土丘陵区乡土草种白羊草(Bothriochloa ischaemum (L.) Keng.)在不同水肥供应条件下的光合生理特征,本研究采用盆栽控制实验,比较研究了白羊草在2种水分水平(HW-80%FC和LW-40FC%)和3种养分(CK,P和NP)处理下的光合光响应曲线特征。结果表明:非直角双曲线模型能很好的拟合白羊草光响应曲线。充分供水条件下(HW),土壤NP营养提高了白羊草最大净光合速率(P′_max),降低了暗呼吸消耗(R_d)并且保持较低的光合补偿点(LCP)和较高的光饱和点(LSP),表明NP营养有利于提高白羊草对光照的广幅适应能力和光合潜力。水分胁迫条件下(LW),P处理显著提高了白羊草P′_max,其表观量子效率(a)和LCP也相对较高,表明施磷将有利于提高干旱条件下白羊草的光合能力。

关键词: 白羊草, 光响应曲线, 氮磷, 水分胁迫

CLC Number:

XU Wei-zhou, XU Bing-cheng, DUAN Dong-ping, NIU Fu-rong. Study on the Photosynthetic Characteristics of Bothriochloa ischaemum under Different Water and Nutrient Conditions Ⅱ. Light-Response Curve[J]. , 2010, 18(6): 773-779.

徐伟洲, 徐炳成, 段东平, 牛富荣. 不同水肥条件下白羊草光合生理生态特征研究Ⅱ.光响应曲线[J]. , 2010, 18(6): 773-779.

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Study on the Photosynthetic Characteristics of Bothriochloa ischaemum under Different Water and Nutrient Conditions Ⅱ. Light-Response Curve

不同水肥条件下白羊草光合生理生态特征研究Ⅱ.光响应曲线

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