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| Effects of Medicago sativa L. planting patterns on the quality of coffee plantation soil in a dry-hot valley area |
| Received:December 13, 2023 |
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| KeyWord:legume cover crop;dry-hot valley;planting pattern;coffee plantation;soil quality |
| Author Name | Affiliation | E-mail | | YAO Li | College of Life Sciences, Southwest Forestry University, Key Laboratory of Conservation and Utilization of Forest Resources in Southwest China, Ministry of Education, Kunming 650224, China | | | LIU Qian | Institute of Tropical and Subtropical Economic Crops, Yunnan Academy of Agricultural Sciences, Baoshan 678000, China | | | WANG Jinhua | College of Life Sciences, Southwest Forestry University, Key Laboratory of Conservation and Utilization of Forest Resources in Southwest China, Ministry of Education, Kunming 650224, China | wangjinhua@swfu.edu.cn | | YAN Qiuli | College of Life Sciences, Southwest Forestry University, Key Laboratory of Conservation and Utilization of Forest Resources in Southwest China, Ministry of Education, Kunming 650224, China | | | JIANG Yurou | College of Life Sciences, Southwest Forestry University, Key Laboratory of Conservation and Utilization of Forest Resources in Southwest China, Ministry of Education, Kunming 650224, China | |
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| Abstract: |
| The aim of this study was to improve the fragile ecological environment of coffee plantations in a hot and dry valley area and explore the effects of different cover crop planting patterns on the soil quality of coffee plantations. The effects of the soil enzyme activity, physicochemical properties, and bacterial community structure and the diversity of cover crops during the full flowering stage of Medicago sativa L. monoculture（A1）and Medicago sativa L.×Vicia villosa Roth var. mixture（A2）. Leisure treatment（CK）was used as a control. The results showed that soil organic matter and nitrogen content in the coffee plantation soil significantly increased（P<0.05）, and the soil pH was restored from weakly alkaline to neutral under A1 and A2 treatments, which was more conducive to the growth of coffee trees. The soil urease activity significantly increased（P<0.05）after A1 treatment, but there were no significant differences in soil catalase activities between the A1, A2, and CK treatments（P>0.05）. The Sobs index and Chao1 index values were significantly lower after A1 treatment than after A2 and CK treatments（P<0.05）. Moreover, the Shannon index values were significantly lower for A1 and A2 than for CK（P<0.05）. Compared with the fallow treatment, monoculture/mixed cover crop planting reduced soil bacterial diversity, but the soil bacterial diversity of Medicago sativa L.×Vicia villosa Roth var. mixture planting was richer than that of Medicago sativa L. monoculture. Acidobacterium was the dominant phylum of the A1 group, whereas Actinomycetes was the dominant phylum of the A2 and CK groups. Acidobacterium RB41 was the dominant genus for the three treatments. pH had the greatest effect on the distribution of soil bacterial populations. The main functions of the bacterial community were carbohydrate metabolism and amino acid metabolism. Cover crop planting could significantly increase soil nutrition, adjust soil pH, affect the soil bacterial community structure, and function. This soil improvement effect could be significant in coffee plantations in dry-hot valley areas, and Medicago sativa L.×Vicia villosa Roth var. mixture planting was found to be more suitable as a cover crop in coffee plantations in these areas. |
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