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首页> 外文学位 >Salt spray effects on rare New England coastal sandplain heathland plant communities (Massachusetts).
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Salt spray effects on rare New England coastal sandplain heathland plant communities (Massachusetts).

机译：盐雾对新英格兰罕见的沿海沙洲石南丛生植物群落（马萨诸塞州）的影响。

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Sandplain heathlands are a rare plant community found in coastal regions of the northeastern United States. Heathlands require disturbances to prevent the succession of native woody species such as Pinus rigida and Quercus spp. This research tested the hypothesis that salt spray maintains the low stature and community composition of these dwarf shrublands. Spatial patterns of salt spray were investigated in heathlands on Martha's Vineyard, Massachusetts, and it was found that salt spray accumulation on plants was highest close to the ocean and decreased as distance increased. In the field, decreased salt input correlated with decreased Myrica pensylvanica leaf necrosis, lowered M. pensylvanica water stress, and increased vegetation height, suggesting that salt spray suppresses plant growth. Additional field surveys found that species distributions changed along environmental gradients, demonstrating that community composition is related to salt spray and edaphic conditions. Manipulative field studies examined the variation in species' responses to salt spray and water availability. Quercus ilicifolia was particularly sensitive to high salt spray and low water availability, suggesting that it might be excluded from areas with those conditions. Greenhouse experiments demonstrated that Solidago nemoralis, P. rigida, and Q. rubra are more susceptible to salt spray than M. pensylvanica, and these species were not found growing close to the ocean. Transplant studies demonstrated that P. rigida seedlings in high salt spray areas exhibit high water stress and needle necrosis as well as inhibited growth. These data suggest that salt spray may be important in suppressing P. rigida growth close to the ocean, thereby slowing the rate of succession to tree-dominated communities. Collectively, this research provides evidence that salt spray maintains heathland stature as well as community composition by excluding salt-intolerant species from coastal areas.
机译：沙洲荒地是在美国东北沿海地区发现的稀有植物群落。荒地荒地需要进行干扰，以防止诸如 Pinus hardica 和 Quercus spp等天然木本物种的演替。这项研究检验了以下假设：盐雾维持这些矮灌木丛的矮小和群落组成。在马萨诸塞州玛莎葡萄园岛的荒地上调查了盐雾的空间分布，发现盐雾在植物附近的累积量最大，靠近海洋，并且随着距离的增加而减少。在田间，盐输入减少与杨梅杨叶片坏死减少， M降低有关。 pensylvanica 水分胁迫和增加的植被高度，表明盐雾抑制了植物的生长。其他野外调查发现，物种分布沿环境梯度变化，表明群落组成与盐雾和深水条件有关。操纵性野外研究检查了物种对盐雾和水的可利用性的变化。 Quercus ilicifolia 对高盐雾和低水利用率特别敏感，表明它可能被排除在那些有这种情况的地区。温室试验表明， nemoralis，P。僵硬，和 Q。红麻比 M对盐雾更敏感。 pensylvanica ，并且这些物种并未在靠近海洋的地方生长。移植研究表明，高盐雾地区的 P。僵尸幼苗表现出高水分胁迫和针叶坏死现象，并抑制了其生长。这些数据表明盐雾可能在抑制 P中很重要。刚生长在靠近海洋的地方，从而减慢了对以树木为主的社区的继承速度。总体而言，这项研究提供了证据表明，盐雾通过排除沿海地区的耐盐物种来维持健康地带的地位和群落组成。

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