土壤微生物膜对沙生植物幼苗光合和荧光特性的影响

doi:10.13866/j.azr.2024.02.10

Abstract

Abstract:

This study investigated the impact of soil microbial film sand fixation on the photosynthetic and fluorescence characteristics of seedlings from two psammophyte species, Ammopiptanthus mongolicus and Astragalus laxmannii. A pot experiment was conducted utilizing different application methods (spray, mix) and application amounts (0, 1, 3, 5, 7, and 10 g·kg^-1). After soil microbial biofilm formation, the characteristics of plant gas exchange and chlorophyll fluorescence were analyzed. The results showed that: (1) An application of bacteria exceeding 3 g·kg^-1 notably increased the hardness and thickness of the consolidated layer, alongside higher soil urease and sucrase activities compared to the control group (P < 0.05). (2) The net photosynthetic rate of Astragalus laxmannii in 3-7 g·kg^-1 treatment was significantly higher than that of the control (P < 0.05). Additionally, its transpiration rate, net photosynthetic rate, and intercellular CO₂ concentration surpassed those of Ammopiptanthus mongolicus (P < 0.05). (3) Astragalus laxmannii treated with over 5 g·kg^-1 displayed significantly higher F_v/F_m values compared to the control group (P < 0.05). Except for the 3 g·kg^-1 treatment, Ammopiptanthus mongolicus exhibited higher F_v/F_m and Q_P values than Astragalus laxmannii. (4) Soil properties, photosynthetic gas exchange, and chlorophyll fluorescence were partially mediated models. Changes in soil characteristics can directly affect the chlorophyll fluorescence characteristics of Ammopiptanthus mongolicus and Astragalus laxmannii. The soil microbial film increased consolidation layer hardness and thickness by 3.84% and 152.85%, respectively, and enhanced catalase, urease, and sucrase activities by 93.37%, 170.68%, and 256.03%, respectively. This improvement in soil quality and leaf stomatal conductance enhanced photosynthetic efficiency and capacity in both plants. The net photosynthetic rate and F_v/F_m increased by 28.48% and 0.84%, respectively.

Key words: soil microbial films, psammophyte, photosynthesis, chlorophyll fluorescence

WU Weiting, WANG Yu, GAO Guanglei, ZHANG Ying, DING Guodong, CAO Hongyu. Effects of soil microbial films on the photosynthesis and fluorescence characteristics of psammophyte seedlings[J].Arid Zone Research, 2024, 41(2): 272-283.

Figures/Tables 10

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固结层	方式		用量		方式×用量
固结层	F	P	F	P	F	P
厚度	32.581	0.000	42.184	0.000	1.951	0.099
硬度	58.313	0.000	88.959	0.000	7.953	0.000

酶种类	方式		用量		方式×用量
酶种类	F	P	F	P	F	P
过氧化氢酶	21.665	0.000	2.902	0.035	3.928	0.010
脲酶	59.563	0.000	36.289	0.000	8.554	0.000
蔗糖酶	231.578	0.000	53.765	0.000	35.682	0.000

Effects of soil microbial films on the photosynthesis and fluorescence characteristics of psammophyte seedlings

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