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Modifying native and exotic species richness correlations: The influence of fire and seed addition

机译：修改本地和外来物种的丰富度相关性：火和种子添加的影响

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摘要

An important goal in restoration is to increase the richness of native species while reducing exotic species. However, native species richness is often positively correlated with exotic species richness. In a grassland-savanna system in Michigan (USA), we show that management that focuses on changing the nature of the exotic-native richness relationship can be used to restore native communities. Native and exotic species richnesses were positively correlated, likely due to a shared coupling with aboveground live biomass (a surrogate for productivity). The addition of native-seed shifted the exotic-native richness relationship from a linear positive to a monotonic relationship: in areas of intermediate levels of exotic species richness, seed addition increased native diversity without an associated effect on exotic diversity, but in areas of high or low exotic richness, it did not affect native species richness. Prescribed burning broke the correlation between native and exotic richness with no consistent effect on the richness of either group. However, when burning was combined with native-seed addition, the relationship between native and exotic richness was maintained and was shifted upwards,. enhancing native recruitment. Although aboveground productivity was strongly related to species richness across the landscape, changes in productivity did not drive these shifts.
机译：恢复的一个重要目标是增加本地物种的丰富度，同时减少外来物种。但是，本地物种丰富度通常与外来物种丰富度呈正相关。在美国密歇根州的草原-热带稀树草原系统中，我们表明，着重于改变外来物种与当地居民之间的丰富关系的性质的管理可用于恢复土著社区。本地和外来物种的丰富度呈正相关，这可能是由于与地上活生物量的共享耦合（生产力的替代）。外来种子的添加使外来物种与自然的丰富度关系从线性正关系转变为单调关系：在中等水平外来物种丰富度的区域中，种子添加增加了自然多样性，而对外来物种多样性没有相关影响，但在高发地区或较低的外来物种丰富度，它不会影响本地物种的丰富度。规定的燃烧破坏了本地和外来丰富度之间的相关性，而对任何一组的丰富度均没有一致的影响。但是，当燃烧与本地种子添加相结合时，本地和外来丰富度之间的关系得以维持并向上移动。加强本地招聘。尽管地上生产力与整个景观中物种的丰富程度密切相关，但生产力的变化并没有推动这些变化。

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