| Effects of biochar continuous returning on soil nutrients, enzyme activities and humus components in soda saline\|alkali paddy field soil |
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| DOI：10.7606/j.issn.1000-7601.2022.04.15 |
| Key Words: biochar continuous returning saline\|alkali soil soil nutrient enzymatic activity humus component |
| Author Name | Affiliation | | LI Hongyu | College of Agronomy, Heilongjiang Bayi Agricultura University, Key Laboratory of Crop Genetic, Breeding and Cultivation, Heilongjiang Provincial Department of Education, Daqing, Heilongjiang 163000, China | | Lin Tian | College of Agronomy, Heilongjiang Bayi Agricultura University, Key Laboratory of Crop Genetic, Breeding and Cultivation, Heilongjiang Provincial Department of Education, Daqing, Heilongjiang 163000, China | | WANG Zhijun | College of Agronomy, Heilongjiang Bayi Agricultura University, Key Laboratory of Crop Genetic, Breeding and Cultivation, Heilongjiang Provincial Department of Education, Daqing, Heilongjiang 163000, China | | ZHAO Haicheng | College of Agronomy, Heilongjiang Bayi Agricultura University, Key Laboratory of Crop Genetic, Breeding and Cultivation, Heilongjiang Provincial Department of Education, Daqing, Heilongjiang 163000, China | | ZHENG Guiping | College of Agronomy, Heilongjiang Bayi Agricultura University, Key Laboratory of Crop Genetic, Breeding and Cultivation, Heilongjiang Provincial Department of Education, Daqing, Heilongjiang 163000, China | | LV Yandong | College of Agronomy, Heilongjiang Bayi Agricultura University, Key Laboratory of Crop Genetic, Breeding and Cultivation, Heilongjiang Provincial Department of Education, Daqing, Heilongjiang 163000, China | | QIAN Yongde | College of Agronomy, Heilongjiang Bayi Agricultura University, Key Laboratory of Crop Genetic, Breeding and Cultivation, Heilongjiang Provincial Department of Education, Daqing, Heilongjiang 163000, China | | FAN Mingyu | College of Agronomy, Heilongjiang Bayi Agricultura University, Key Laboratory of Crop Genetic, Breeding and Cultivation, Heilongjiang Provincial Department of Education, Daqing, Heilongjiang 163000, China |
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| Abstract: |
| To understand the improvement effects of biochar on soda saline\|alkali soil paddy field, pot experiments were set up during 2014 to 2019. The effects of continuous biochar returning on content of soil nutrient content, electric conductivity, pH, enzymatic activities and humus component were studied. The results showed that under biochar returning of 7.5~16.5 t·hm-2, the contents of total N, total P, available P and available K in the soil increased by 19.09%～30.00%,34.58%～45.37%,19.04%～39.16%,38.65%～63.12% （P＜0.05） respectively. Under biochar returning of 12.0～16.5 t·hm-2, Alkaline N in the soil increased by 5.34%～6.87% (P＜0.05). The soil electrical conductivity first increased and then decreased with the amount of biochar returning, and the peak value appeared at 7.5 t·hm-2. Soil pH was significantly positively correlated with biochar returning amount, and soil pH of biochar 12.0~16.5 t·hm-2 was significantly higher than that without biochar. Under biochar returning of 7.5~12.0 t·hm-2, compared with the treatment without biochar, organic matter content, total humus carbon and humin carbon content increased by 48.74% ~ 70.51%, 47.40% ~ 69.94% and 68.94% ~ 96.48% respectively. HA/FA and PQ increased first and then decreased with biochar returning amount, and the peak value was 12 t·hm-2. Under biochar returning of 7.5 t·hm-2, compared with the treatment without biochar, urease activity increased by 89.03% and alkaline phosphatase decreased by 41.27%. Under biochar returning of 12.0 t·hm-2, urease activity was increased by 53.33% (P＜0.05), and the invertase activity was increased by 41.84 % (P＜0.05). Therefore, continuous biochar returning effectively improved the paddy field of soda saline\|alkali soil. The 7.5～12.0 t·hm-2 amount is recommended as the suitable biochar returning from this study. |
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