Photosynthetic Light-response Curves of Lespedeza davurica under Different Water and Fertilization Conditions

doi:10.11733/j.issn.1007-0435.2015.04.018

Acta Agrestia Sinica ›› 2015, Vol. 23 ›› Issue (4): 785-792.DOI: 10.11733/j.issn.1007-0435.2015.04.018

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Photosynthetic Light-response Curves of Lespedeza davurica under Different Water and Fertilization Conditions

WU Ai-jiao¹, XU Wei-zhou^2,3, GUO Ya-li², CHEN Ji², LI Shuai⁴, XU Bing-cheng⁴

1. College of Life Sciences, Northwest A&F University, Yangling, Shaanxi Province 712100, China;
2. College of Forestry, Northwest A&F University, Yangling, Shaanxi Province 712100, China;
3. Yulin University, Yulin, Shaanxi Province, 719000;
4. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi Province 712100, China

Received:2014-07-23 Revised:2014-12-10 Online:2015-08-15 Published:2015-08-26

不同水肥条件下达乌里胡枝子的光合-光响应曲线特征

吴爱姣¹, 徐伟洲^2,3, 郭亚力², 陈吉², 李帅⁴, 徐炳成⁴

1. 西北农林科技大学生命科学学院, 陕西杨凌 712100;
2. 西北农林科技大学林学院, 陕西杨凌 712100;
3. 榆林学院, 陕西榆林 719000;
4. 中国科学院水利部水土保持研究所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

通讯作者: 徐炳成
作者简介:吴爱姣(1989-),女,陕西富平人,硕士研究生,研究方向为植物水分与抗旱分子生物学,E-mail:angela-ll@foxmail.com
基金资助:
国家自然科学基金(41371509);教育部新世纪优秀人才支持计划(NECT-11-0444);西北农林科技大学中央高校基本科研业务费专项(ZD2013020)资助

Abstract

Abstract:

In order to study the photosynthetic and physiological characteristics of Lespedeza davurica from loess hilly-gully region under different water and fertility conditions, the photosynthesis-light response curves (P_n-PAR) were determined under potted conditions with three water regimes (HW(80%±5% field capacity, FC), MW(60%±5%FC), LW(40%±5%FC)) and four nutrient treatments(CK, N, P, NP). Results indicated that a rectangular hyperbolic correction model was more appropriate to simulate the P_n-PAR curves of L. davurica under different water and fertility conditions. Under HW regime, NP application significantly improved the maximum net photosynthetic rate (P_nmax), apparent quantum yield (AQY) and light saturation point (LSP); Phosphorus fertilization or nitrogen and phosphorus application together could enhance photosynthetic capacity under adequate water supply, while P application not only can improve its photosynthesis under water stress, and increase its utilization ability to broader light intensity range.

Key words: Nitrogen and phosphorus, Water stress, Rectangular hyperbolic correction model, Non-rectangular hyperbolic model, Photosynthesis

摘要：

为揭示黄土丘陵区达乌里胡枝子(Lespedeza davurica)在不同土壤水分与养分供应条件下的光合生理特征,采用盆栽控制试验,比较研究了在3种水分水平(高水HW,80±5%田间持水量FC;中水MW,60±5%FC和低水LW,40±5%FC)与4种养分处理(CK, N, P和NP)下达乌里胡枝子生长旺期的叶片光合-光响应曲线特征。结果表明:直角双曲线修正模型比非直角双曲线模型更准确地拟合了不同水肥条件下达乌里胡枝子的光合-光响应曲线。HW水平下,P处理显著提高达乌里胡枝子的最大净光合速率(P_nmax),表观量子效率(AQY)与光饱和点(LSP);施磷肥有利于提高充分供水条件下达乌里胡枝子的光合能力,单施磷肥可以改善其在水分胁迫条件下叶片光合作用,以及提高达乌里胡枝子对光能的广幅利用能力。

关键词: 氮磷, 水分胁迫, 直角双曲线修正模型, 非直角双曲线模型, 光合作用

CLC Number:

Q945.11

WU Ai-jiao, XU Wei-zhou, GUO Ya-li, CHEN Ji, LI Shuai, XU Bing-cheng. Photosynthetic Light-response Curves of Lespedeza davurica under Different Water and Fertilization Conditions[J]. Acta Agrestia Sinica, 2015, 23(4): 785-792.

吴爱姣, 徐伟洲, 郭亚力, 陈吉, 李帅, 徐炳成. 不同水肥条件下达乌里胡枝子的光合-光响应曲线特征[J]. 草地学报, 2015, 23(4): 785-792.

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Photosynthetic Light-response Curves of Lespedeza davurica under Different Water and Fertilization Conditions

不同水肥条件下达乌里胡枝子的光合-光响应曲线特征

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