| 水氮耦合对盐碱地柳枝稷光合生理及生物质产量的影响 |
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| 引用本文： | 闫承宏,吴 娜,刘吉利,常雯雯,何海锋,杨 茜,满本菊,王志丹.水氮耦合对盐碱地柳枝稷光合生理及生物质产量的影响[J].西北农业学报,2021,30(4):582-590. |
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| 作者姓名： | 闫承宏 吴 娜 刘吉利 常雯雯 何海锋 杨 茜 满本菊 王志丹 |
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| 作者单位： | （1.宁夏大学 农学院，银川 750021；2.宁夏大学 生态环境学院，银川 750021） |
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| 基金项目： | 国家自然科学基金（31860344，31560631）。 |
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| 摘 要： | 通过设置750 m~3/hm~2(W1)、1 500 m~3/hm~2(W2)、3 000 m~3/hm~2(W3)3个灌水及施氮0 kg/hm~2(F0)、60 kg/hm~2(F1)、120 kg/hm~2(F2)、240 kg/hm~2(F3)4个水平,研究水氮对盐碱地柳枝稷光合生理特性及生物质产量的影响。结果表明:施氮和灌水对盐碱地0～20 cm土层土壤含水率影响显著,20～40cm土层土壤含水率主要受到氮肥影响;灌水量和施氮量同时影响叶片叶绿素含量、净光合速率、蒸腾速率、气孔导度及生物质产量,表现为:水分效应水氮耦合效应氮肥效应,氮肥的增效作用在到达一定程度后将不再增加;相关性分析表明柳枝稷生物质产量与开花期光合指标呈显著正相关关系。银北盐碱地区,高水中氮条件下(灌水量3 000 m~3/hm~2、施氮量120 kg/hm~2)有利于提高柳枝稷开花期叶绿素含量,促进叶片光合作用,从而获得较高的生物质产量。
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| 关 键 词： | 盐碱地 柳枝稷 水氮耦合 光合特性 产量 |
Effects of Water-nitrogen Coupling on Photosynthetic Physiology and Biomass Yield of Switchgrass in Saline-alkali Soil |
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| YAN Chenghong,WU N,LIU Jili,CHANG Wenwen,HE Haifeng,YANG Qian,MAN Benju and WANG Zhidan.Effects of Water-nitrogen Coupling on Photosynthetic Physiology and Biomass Yield of Switchgrass in Saline-alkali Soil[J].Acta Agriculturae Boreali-occidentalis Sinica,2021,30(4):582-590. |
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| Authors: | YAN Chenghong WU N LIU Jili CHANG Wenwen HE Haifeng YANG Qian MAN Benju and WANG Zhidan |
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| Abstract: | The effects of water and nitrogen on photosynthetic physiological characteristics and biomass yield of switchgrass in saline-alkali land were studied by three irrigation levels of 750 m/hm(W1), 1 500 m/hm(W2), 3 000 m/hm(W3) and four nitrogen levels of 0 kg/hm(F0), 60 kg/hm(F1), 120 kg/hm(F2), and 240 kg/hm(F3).The results showed that nitrogen application and irrigation had significant effect on the soil moisture content at 0-20 cm soil layers in saline-alkali land, and the soil moisture content at 20-40 cm soil layers was mainly affected by nitrogen fertilizer; The irrigation and nitrogen management simultaneously affected the leaf chlorophyll content,net photosynthesis rate, transpiration rate, stomatal conductance and biomass yield, and its order was water effect > water-nitrogen coupling effect > nitrogen fertilizer effect. The synergistic effect of nitrogen fertilizer will stop increasing after it reached a certain level; The correlation analysis showed that there was a significant positive correlation between switchgrass biomass yield and photosynthetic indicators during flowering stage. In the saline-alkali area of northern Yinchuan plain, appropriate irrigation and nitrogen management was beneficial to increase the chlorophyll content of switchgrass at flowering stage, and promoted leaf photosynthesis, and higher biomass yield was obtained under the condition of irrigation amount of 3 000 m/hm and nitrogen application level of 120 kg/hm. |
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| Keywords: | Saline-alkali land Switchgrass Water-nitrogen coupling Photosynthetic characteristics Yield |
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