Restoring Soil Calcium Reverses Forest Decline
Restoring Soil Calcium Reverses Forest Decline
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DOI：
10.1021/ez400033d
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发表时间：
2014-01-01
影响因子：
10.9
通讯作者：
Johnson, Chris E.
中科院分区：
文献类型：
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作者：
Battles, John J.;Fahey, Timothy J.;Johnson, Chris E.
美国东北部森林的减少与酸沉降对土壤养分的影响有关。为了测试这种联系，我们在新罕布什尔州哈伯德布鲁克实验森林的一对分水岭中添加了一种硅酸钙矿物质，其量旨在逐渐取代由于世纪人类活动（主要是由于酸沉积）而损失的估计钙量。试验恢复后，林木生物量增量有所恢复。钙营养的改善也促进了较高的地上净初级生产力和增加光合表面积在处理流域相对于参考流域。这些结果表明，酸沉降加速的土壤酸化导致了美国东北部天然酸性土壤上森林生长和健康的下降，而这种下降可以通过添加钙来逆转。
Forest decline in the northeastern United States has been linked to the effects of acid deposition on soil nutrients. To test this link, we added a calcium silicate mineral to a paired watershed at the Hubbard Brook Experimental Forest, New Hampshire, in an amount designed to gradually replace the estimated amount of calcium lost as a result of human activity in the 20th Century (primarily because of acid deposition). The experimental restoration resulted in a recovery of tree biomass increment. The improved calcium nutrition also promoted higher aboveground net primary production and increased the photosynthetic surface area in the treated watershed relative to that in the reference watershed. These results demonstrated that soil acidification accelerated by acid deposition has contributed to the decline of forest growth and health on naturally acidic soil in the northeastern United States and that decline can be reversed by the addition of calcium.