Photosynthetic Characteristics,Chlorophyll Fluorescence Parameters and Biomass of Alfalfa under Different Irrigation Treatments

doi:10.11733/j.issn.1007-0435.2019.06.014

Acta Agrestia Sinica ›› 2019, Vol. 27 ›› Issue (6): 1569-1576.DOI: 10.11733/j.issn.1007-0435.2019.06.014

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Photosynthetic Characteristics,Chlorophyll Fluorescence Parameters and Biomass of Alfalfa under Different Irrigation Treatments

LI Jun¹, QI Guang-ping¹, KANG Yan-xia¹, MA Yan-lin¹, YIN Min-hua¹, LI Xiao-min¹, LI Zhi²

1. College of Water Resources and Hydropower Engineering, Gansu Agricultural University, Lanzhou, Gansu province 730070, China;
2. Gansu Yangliuqing Forage Feed Development Co., Ltd., Jinchang, Gansu province 737200, China

Received:2019-06-25 Revised:2019-09-17 Online:2019-12-15 Published:2019-12-31

不同灌溉处理下紫花苜蓿光合特性、叶绿素荧光参数及生物量的变化

刘军¹, 齐广平¹, 康燕霞¹, 马彦麟¹, 银敏华¹, 李晓敏¹, 栗志²

1. 甘肃农业大学水利水电工程学院, 甘肃兰州 730070;
2. 甘肃杨柳青牧草饲料开发有限公司, 甘肃金昌 737200

通讯作者: 齐广平,E-mail:qigp@gsau.edu.cn
作者简介:刘军(1990-),男,甘肃定西人,硕士研究生,主要从事旱区水资源的高效利用研究,E-mail:liuj900918@163.com
基金资助:
国家重点研发计划"水资源高效利用专项"（2016YFC0400304）；农业生物技术研究与应用开发项目（GNSW-2016-26）；农业部公益性行业专项（201403048）；覆盖施氮模式调控紫花苜蓿水氮吸收利用机制研究（GAU-KYQD-2018-08）；西北荒漠灌区紫花苜蓿增产优质高效的覆盖节灌模式研究（2019A-057）资助

Abstract

Abstract: In order to obtain the high-yield water-saving technology of alfalfa in Yongchang desertification irrigation area,the photosynthetic characteristics of Gannong 3 alfalfa under different water stress were studied. Soil moisture was artificially controlled using subsurface drip irrigation. Chlorophyll fluorescence parameters and aboveground biomass were analyzed. The results showed that with the increase of water stress,the factors affecting the photosynthetic characteristics of alfalfa gradually changed from stomatal limitation to non-stomatal limitation,and the water use efficiency (WUE) increased first and then decreased,at 10:00 and 16:00. The WUE of mild water stress was significantly greater than that of full irrigation. With the increase of water stress,the total content of chlorophyll increased first and then decreased,indicating that it is more favorable for chlorophyll synthesis under mild water stress;The chlorophyll fluorescence parameters of alfalfa and the yield of hay gradually decreased. Severe water stress inhibited the photochemical activity of PSII,which affected the hay yield of alfalfa;There is no significant difference between mild water stress and full irrigation,indicating the possibility of achieving high yield and water saving under mild water stress.

Key words: Alfalfa, Water stress, Diurnal variation of photosynthesis, Chlorophyll fluorescence, Biomass

摘要： 为了在永昌荒漠化灌区获得紫花苜蓿（Medicago sative）的高产节水技术，本研究以甘农3号紫花苜蓿为试验材料，在地下滴灌方式下，采取人工控制土壤水分的方法，对不同水分胁迫下紫花苜蓿的光合特性、叶绿素荧光参数及地上生物量进行研究。结果表明：随着水分胁迫的加剧，影响紫花苜蓿的光合特性的因素由气孔限制逐渐转变为非气孔限制，水分利用效率（water use efficiency，WUE）呈先上升后下降趋势，在10：00和16：00左右时轻度水分胁迫的WUE显著大于充分灌溉的；随着水分胁迫的加剧，叶绿素总含量均先升高后降低，表明在轻度水分胁迫下更有利于叶绿素的合成；随着水分胁迫的加剧，紫花苜蓿的叶绿素荧光参数下降幅度逐渐加大，干草产量也逐渐下降，严重的水分胁迫会抑制了PSⅡ的光化学活性，从而影响了紫花苜蓿的干草产量；轻度水分胁迫与充分灌溉之间无显著差异，这体现了在轻度水分胁迫下也能够达到高产的目的。

关键词: 紫花苜蓿, 水分胁迫, 光合日变化, 叶绿素荧光, 生物量

CLC Number:

S963.22+3.3

LI Jun, QI Guang-ping, KANG Yan-xia, MA Yan-lin, YIN Min-hua, LI Xiao-min, LI Zhi. Photosynthetic Characteristics,Chlorophyll Fluorescence Parameters and Biomass of Alfalfa under Different Irrigation Treatments[J]. Acta Agrestia Sinica, 2019, 27(6): 1569-1576.

刘军, 齐广平, 康燕霞, 马彦麟, 银敏华, 李晓敏, 栗志. 不同灌溉处理下紫花苜蓿光合特性、叶绿素荧光参数及生物量的变化[J]. 草地学报, 2019, 27(6): 1569-1576.

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Photosynthetic Characteristics,Chlorophyll Fluorescence Parameters and Biomass of Alfalfa under Different Irrigation Treatments

不同灌溉处理下紫花苜蓿光合特性、叶绿素荧光参数及生物量的变化

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