Beaver pond biogeochemical effects in the Maryland Coastal Plain
Beaver pond biogeochemical effects in the Maryland Coastal Plain
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DOI：
10.1023/a:1006330501887
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发表时间：
2000-06-01
期刊：
影响因子：
4
通讯作者：
Weller, DE
中科院分区：
文献类型：
--
作者：
Correll, DL;Jordan, TE;Weller, DE
在其中一个流域底部附近形成一个1.25公顷的海狸池塘之前的六年和之后的六年，对美国马里兰州沿海平原两个相邻的二级流域的物质通量和浓度进行了测量。集水区有粘土隔水层，并配备了V型缺口堰和连续积分式水样。河狸塘的年排水量、总氮、总磷、溶解硅酸盐、总有机碳和悬浮物的年排放量分别减少了8、18、21、32、28和27%。总氮的减少主要是由于冬季和春季对硝态氮的滞留增加，以及冬夏季对Ton的滞留。大部分总磷的减少是TPI和TOP在冬季和夏季滞留的结果。溶解性硅酸盐滞留高峰出现在春季，TOC和TSS滞留高峰出现在冬季。在河狸塘形成之前，TON、TPI、TOP、TOC和TSS的浓度与径流流量有极显著的相关性，尤其是在冬季，但在河狸池塘形成后，这些浓度与径流流量的关系很小或没有关系。然而，春季的硝酸盐浓度和夏季的氨氮浓度与河狸池塘形成前后的径流流量高度相关，流量与这些营养物质浓度的回归更好地解释了河狸塘形成后浓度的变化。
The fluxes and concentrations of materials from two contiguous second-order watersheds in the Coastal Plain of Maryland, U.S.A. were measured for six years prior to and six years subsequent to the formation of a 1.25 ha beaver pond near the bottom of one of the watersheds. The watersheds have a clay aquiclude and were equipped with V-notch weirs and continuous volume-integrating water samplers. The beaver pond reduced annual discharge of water, total-N, total-P, dissolved silicate, TOC, and TSS by 8, 18, 21, 32, 28, and 27%, respectively. Most of the total-N reduction was due to increased retention of nitrate in the winter and spring and TON in the winter and summer. Most of the total-P reduction was the result of retention of both TPi and TOP in the winter and summer. Dissolved silicate retention peaked in the spring, while TOC and TSS retention peaked in the winter. Prior to the formation of the beaver pond, concentrations of TON, TPi, TOP, TOC, and TSS had highly significant correlations with stream discharge, especially in the winter, but subsequent to the pond there was little or no relationship between these concentrations and stream discharge. However, concentrations of nitrate in the spring and ammonium in the summer were highly correlated with stream discharge both before and after the formation of the beaver pond and regressions of discharge versus concentrations of these nutrients explained more of the variation in concentrations after the formation of the pond.