Organic and Inorganic Contributions to Vertical Accretion in Salt Marsh Sediments
Organic and Inorganic Contributions to Vertical Accretion in Salt Marsh Sediments
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有机和无机对盐沼沉积物垂直沉积的贡献
DOI：
10.1007/0-306-47534-0_27
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
C. S. Milan
中科院分区：
文献类型：
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作者：
R. Turner;E. Swenson;C. S. Milan
估计了从新英格兰到墨西哥湾的141个盐沼的有机和无机成分对近期垂直沉积速率的贡献(自1963/4年以来)。垂直积累速率范围为0.09~1.78 cm y−1，无机积累速率范围为0.01~0.53g cm y−1。盐沼土壤有机质和无机物的积累量平均分别占总量的3.8%和4.9%，在土壤类型中处于较低水平。剩下的土壤体积是水和空气。垂直沉积和有机堆积之间存在直接关系，可以解释所有样品加在一起的59%的变化。相反，容重与无机含量直接相关，而与垂直吸积速率无关。将垂直堆积描述为矿物和有机堆积函数的多元回归方程表明，对于东海岸盐沼(n=19；重量)，有机堆积的重要性是无机堆积的5倍，但对于墨西哥湾盐沼(n=122)或所研究的所有盐沼(n=141)，无机物含量是一个统计上不显著的因素。一次简单的线性回归表明，盐沼海拔每上升1厘米由10.9g有机质组成。在没有无机积累的情况下，0.02g有机质y−1积累的阈值水平可以继续下去。似乎是有机物的积累控制了已建立的沼泽中的无机积累，而不是相反。这些结果证明了地下植物材料在盐沼一旦建立后在维持中的主导作用。当湿地水文发生变化时，受到影响的是土壤有机成分(通过氧化或地下植物生长)，从而解释了通过间接的水文变化将盐沼转化为开阔水域。如果要成功实施长期和有效的战略，盐沼管理和恢复工作将很好地考虑到植物的健康，特别是地下的健康。生物成分，而不是地质成分，似乎控制着已建立的盐沼的命运。
The contribution of organic and inorganic constituents to recent vertical accretion rates (since 1963/4) was estimated for 141 salt marshes ranging from New England to the Gulf of Mexico. The range of vertical accretion and inorganic accumulation rates were 0.09 to 1.78 cm y−1, and 0.01 to 0.53 g cm y−1, respectively. The volume of the accumulated organic and inorganic in all salt marshes averaged 3.8 and 4.9%, respectively, of the total, which is relatively low among soil types. The remaining soil volume is water and air. There was a direct relationship between vertical accretion and organic accumulation that explained 59% of the variation for all samples combined. In contrast, the bulk density is strongly and directly related to inorganic content, but not the vertical accretion rate. A multiple regression equation describing the vertical accumulation as a function of mineral and organic accumulation suggests that organic accumulation is five times more important than inorganic accumulation for East coast salt marshes (n=19; weight basis), but that inorganic content is a statistically-insignificant factor for Gulf of Mexico salt marshes (n=122), or for all salt marshes examined (n=141). A simple linear regression showed that a 1 cm rise in salt marsh elevation was composed of 10.9 g of organic matter. A threshold level of 0.02 g organic matter y−1 accumulation can continue without inorganic accumulation. It appears that it is the accumulation of organic matter that controls inorganic accumulation in established marshes, not the reverse. These results document the dominant role of below ground plant material in maintaining salt marshes once they are established. When wetland hydrology is altered, it is the organic soil constituents that are affected (through oxidation or plant growth below ground), thus explaining salt marsh conversion to open water through indirect changes in hydrology. Salt marsh management and restoration efforts would do well to keep in mind the plant’s health, especially belowground, if the long-term and effective strategies are to be successfully implemented. The biological components, not the geological components, appear to control the fate of established salt marshes.