Effects of soil microbial films on the photosynthesis and fluorescence characteristics of psammophyte seedlings
Received date: 2023-05-23
Revised date: 2023-10-20
Online published: 2024-06-20
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 Fv/Fm values compared to the control group (P < 0.05). Except for the 3 g·kg-1 treatment, Ammopiptanthus mongolicus exhibited higher Fv/Fm and QP 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 Fv/Fm increased by 28.48% and 0.84%, respectively.
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 . DOI: 10.13866/j.azr.2024.02.10
表1 不同菌剂施用方式和施用量对土壤固结层影响的双因素方差分析Tab. 1 Results of Two -Way ANOVA of the different bacteria application methods and amounts on soil consolidation layer |
| 固结层 | 方式 | 用量 | 方式×用量 | |||||
|---|---|---|---|---|---|---|---|---|
| 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 | ||
表2 不同菌剂施用方式和施用量对土壤酶活性影响的双因素方差分析Tab. 2 Results of Two -Way ANOVA of the different bacteria application methods and amounts on soil enzyme activity |
| 酶种类 | 方式 | 用量 | 方式×用量 | |||||
|---|---|---|---|---|---|---|---|---|
| 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 | ||
图4 不同菌剂施用量下光合作用参数的增量Fig. 4 Increment of photosynthetic parameters under different application amount of bacteria |
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