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In the agroforestry system, the spatial distribution of the root system of each component determines its competitive ability to the resources in the system, which is an important basis for the design of an agroforestry system. In this paper, the root density and spatial distribution of Areca catechu and elephant grass in the compound system were studied by the zonal layered mining method, and the underground competition index of A. catechu and elephant grass was calculated by the niche overlap formula proposed by Levins. The biomass density of betel nut root (1343.88 g/m3) was 2.41 times that of elephant grass (558.53 g/m3). In the horizontal direction, the biomass density, root length density and competition index of fine roots (0-2 mm), middle roots (2-5 mm) and thick roots (> 5mm) of A. catechu decreased with the increase of the distance between roots and the base of A. catechu trunk. The root biomass density, root length density and competition index of elephant grass increased with the increase of distance, and the distribution was relatively uniform. In the horizontal direction, the root biomass density of A. catechu in 80cm from the trunk of A. catechu was significantly higher than that of elephant grass, and the root biomass density of elephant grass in 120-140 cm was significantly higher than that of A. catechu, but there was no significant difference between them in other distances. The root length density of A. catechu in 20-40 cm was higher than that of elephant grass, but the difference is not significant. The root length density of elephant grass in other horizontal distances was significantly higher than that of A. catechu. Except 20-60 cm from the trunk, the competition index of elephant grass in other areas was higher than that of betel nut. In the vertical direction, the biomass density, root length density and competition index of fine root, middle root, thick root and elephant grass root in 0-20 cm soil layer were significantly higher than those in 20-40 cm soil layer. In the two soil layers, the root length density of A. catechu root system was smaller than that of elephant grass, while the biomass density and competition index of A. catechu root system were larger than that of elephant grass. The results show that although the root distribution of A. catechu and elephant grass overlaps in space, they have their own advantages in a certain area, and neither can form an absolute competitive advantage over the other, thus both can grow healthily in the competition. Therefore, in order to effectively reduce the competition between betel nut and elephant grass, give full play to their respective advantages, and maximize their yield and benefit, we should appropriately increase the planting distance between elephant grass and betel nut trees, and appropriately strengthen the water and fertilizer input in the upper soil in the intercropping area.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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