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首页> 外文期刊>Plant and Soil >Silvopasture for reducing phosphorus loss from subtropical sandy soils
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Silvopasture for reducing phosphorus loss from subtropical sandy soils

机译：Silvopasture可减少亚热带沙质土壤中的磷损失

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Phosphorus (P) losses from sandy soils that are predominant in the 1.4 million ha of pastureland in Florida are a major cause of water pollution. We hypothesized that soil P loss would be lower from silvopastoral systems than from treeless pastures because soil P removal by a combined stand of trees and pasture would be more than that of treeless pasture. Four slash pine (Pinus elliottii Engelm.) + bahiagrass (Paspalum notatum Fluegge) silvopastoral systems located in Alachua, Suwannee, Manatee, and Osceola counties in Florida were selected for the study. The former two sites are on Ultisols, and the latter two on Spodosols. Soil samples were collected at different depth increments. Soil P storage capacity (SPSC), the maximum amount of P that can be safely applied to a soil before it becomes an environmental concern, was calculated. Water-soluble P concentrations in the 0-5 cm soil layer ranged from 4 to 11 mg kg super(-1) for the silvopasture sites and 10 to 23 mg kg super(-1) in the treeless pasture sites, with higher P concentrations in the treeless pasture at each location. Total SPSC in the upper 1 m depth ranged from 342 to 657 kg ha super(-1) in the silvopasture sites and -60 to 926 kg ha super(-1) in the treeless pasture sites (a negative value indicates that the soil is a P source). The results suggest that P buildup within the soil profile and therefore the chances for loss of P from soil to water bodies were less from silvopastures than from treeless pastures. Thus, silvopasture systems can be expected to provide greater environmental service in regard to water quality protection compared to treeless pastures under comparable ecological settings
机译：佛罗里达州140万公顷牧场中的沙质土壤中的磷（P）损失是造成水污染的主要原因。我们假设森林牧草系统的土壤P损失要比无树的牧场少，因为树木和牧场联合砍伐的土壤P比无树的牧场要多。选择了位于佛罗里达州阿拉卡瓦，苏万尼，海牛和奥塞奥拉县的四个斜线松树（Pinus elliottii Engelm。）+ bahiagrass（Paspalum notatum Fluegge）木牧系统。前两个站点在Ultisols上，后两个站点在Spodosols上。以不同的深度增量收集土壤样品。计算了土壤磷存储量（SPSC），即在成为环境问题之前可以安全施用于土壤的最大磷含量。沙丘牧草场所0-5 cm土壤层中的水溶性P浓度范围为4至11 mg kg super（-1），无树牧场场所中的水溶性P浓度范围为10至23 mg kg super（-1）在每个位置都没有树木的牧场上。海拔1 m的总SPSC范围在林牧区为342至657 kg ha super（-1），在无树牧场为-60至926 kg ha super（-1）（负值表示土壤P源）。结果表明，土壤植被中磷在土壤剖面中的积累以及因此从土壤流向水体的磷损失的机会要少于无树草场。因此，与具有可比性的生态环境下的无树牧场相比，可以期望silvopasture系统在水质保护方面提供更好的环境服务。

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