Grazing and topography control nutrient pools in low Arctic soils of Southwest Greenland.
Grazing and topography control nutrient pools in low Arctic soils of Southwest Greenland.
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放牧和地形控制格陵兰西南部低北极土壤中的营养库。
DOI：
10.1111/ejss.13278
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发表时间：
2022-07
影响因子：
4.2
通讯作者：
中科院分区：
文献类型：
--
作者：
在气候变化的情况下，干旱低洼的北极地区的土壤养分库可能会释放，这种生物利用度有可能增加陆地和水生生物的产量。除了变暖的直接影响外，营养物沉积和放牧等外部干扰也会导致生态系统变化。本研究在低北极Kangerlussuaq地区的格陵兰岛西南部的土壤养分库的地形位置上的链和土壤深度在两个小集水区对比麝牛丰度。我们检验了以下假设：两个地点（SS 17 b，有麝牛，vs-SS 85，无麝牛）的土壤碳（C）、氮（N）和磷（P）在土壤链（山脊-斜坡-山谷）和土壤深度（凋落物-0-5 cm-25-30 cm）上存在差异。土壤的总C和N浓度平均低于SS 17 b相比，SS 85。此外，土壤氮浓度增加下坡链与更高的数额相比，在山谷中的斜坡和山脊。集水区之间的土壤磷浓度（0.70 g P kg−1）相似;然而，凋落物磷含量差异很大。两个集水区之间的土壤养分的差异最有可能是由于在SS 17 b的麝香草的存在，因此放牧相关的过程（排便，改变微生物学和养分循环）。这项研究强调了北极景观的异质性和生态系统特定研究的必要性。对格陵兰两个低北极集水区的土壤养分库进行了比较。放牧和粪便投入麝牛影响土壤养分库在格陵兰岛。Kangerlussuaq的土壤磷储量与欧洲集约化管理的农田相似。北极景观的异质性和生态系统特定研究的需要得到了强调。
Soil nutrient pools in the dry low Arctic are likely to be released under climatic change and this bioavailability has the potential to increase both terrestrial and aquatic productions. As well as the direct effect of warming, external disturbances such as nutrient deposition and grazing can also drive ecosystem change. This study in the low Arctic Kangerlussuaq area of southwest Greenland compared soil nutrient pools in terms of both topographic position on a catena and by soil depth in two small catchments with contrasting muskox abundance. We tested the hypotheses that there were differences between soil carbon (C), nitrogen (N) and phosphorus (P) across a soil catena (ridge ‐ slope ‐ valley) and by soil depth (litter ‐ 0–5 cm ‐ 25–30 cm) for the two sites (SS17b, muskox present, versus ‐ SS85, no muskox). Total C and N concentrations of soils were on average lower at SS17b compared to SS85. Moreover, the soil N concentration increased downslope in the catena with higher amounts in the valleys compared to the slopes and ridges. Soil P concentration (0.70 g P kg−1) was similar between catchments; however, litter P content was substantially different. The difference in soil nutrients between the two catchments was most likely due to the presence of muskox at SS17b, and hence grazing associated processes (defecation, altered microbiology and nutrient cycling). This study emphasises the heterogeneity of arctic landscapes and need for ecosystem specific research. Soil nutrient pools in two low‐arctic catchments in Greenland were compared. Grazing and dung inputs by muskox affect soil nutrient pools in Greenland. Soil P stores in Kangerlussuaq are similar to intensively managed farmland in Europe. The heterogeneity of arctic landscapes and need for ecosystem‐specific research are emphasised.
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影响因子：
10.1
作者：
Anderson NJ;Saros JE;Bullard JE;Cahoon SMP;McGowan S;Bagshaw EA;Barry CD;Bindler R;Burpee BT;Carrivick JL;Fowler RA;Fox AD;Fritz SC;Giles ME;Hamerlik L;Ingeman-Nielsen T;Law AC;Mernild SH;Northington RM;Osburn CL;Pla-Rabès S;Post E;Telling J;Stroud DA;Whiteford EJ;Yallop ML;Yde JC
通讯作者：
Yde JC
影响因子：
3.3
作者：
Dixon, Jean L.;Heimsath, Arjun M.;Amundson, Ronald
通讯作者：
Amundson, Ronald
影响因子：
2.1
作者：
Anderson, N. J.;Liversidge, A. C.;Jones, M. D.
通讯作者：
Jones, M. D.
影响因子：
2
作者：
Bol, R;Eriksen, J;Christensen, BT
通讯作者：
Christensen, BT
影响因子：
11.6
作者：
Cahoon, Sean M. P.;Sullivan, Patrick F.;Welker, Jeffrey M.
通讯作者：
Welker, Jeffrey M.