Responses of alpine meadow seed bank and vegetation to nine consecutive years of soil fertilization
Responses of alpine meadow seed bank and vegetation to nine consecutive years of soil fertilization
复制标题
高寒草甸种子库和植被对连续九年土壤施肥的响应
DOI：
10.1016/j.ecoleng.2014.04.009
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发表时间：
2014-09
影响因子：
3.8
通讯作者：
Guozhen Du
中科院分区：
文献类型：
--
作者：
Zhen Ma;Miaojun Ma;Jerry M. Baskin;Carol C. Baskin;Junyong Li;Guozhen Du
许多研究表明，营养物富集会导致地上物种多样性下降。然而，土壤种子库的信息也是重要的物种丰富的植被恢复，但这个问题很少受到关注。研究了沿着施肥梯度的高寒草甸春季能萌发的地上植被与土壤种子库的关系。我们确定了物种丰富度，密度，生活型和功能群在土壤种子库和地上植被沿着N-P施肥梯度从0到Fer 120（120 g/m2，即25.4 g N和28.2 P m2/年）。采用非度量多维尺度方法对土壤种子库与地上植被的相似性进行了检验。施肥9年后，土壤种子库和植被的物种丰富度均呈下降趋势，但种子库的下降速度慢于植被。除Fer 30的种子密度最高外，其它施肥梯度的种子密度沿着没有差异。植被密度沿着施肥梯度递减。沿着施肥水平的提高，植被和土壤种子库中一年生植物的比例均增加。土壤种子库中不同功能群所占比例的变化小于植被中的变化。土壤种子库与植被的相似性从Fer 0到Fer 90逐渐增大，到Fer 120后逐渐减小。施肥影响土壤种子库的物种组成，但对地上植被的影响较小。春季的种子库提供了高物种丰富度和高种子密度的恢复，但恢复到非受精状态将是困难的，由于转移到一年生植物的比例较高，莎草沿着施肥梯度的比例较低。
Decline in aboveground species diversity in response to nutrient enrichment has been demonstrated by many studies. However, information on the soil seed bank also is important for restoration of species-rich vegetation, but this subject has received little attention. The aim of this study was to investigate the relationship between the aboveground vegetation and the soil seed bank of an alpine meadow along a fertilization gradient that can germinate in spring. We determined species richness, density, life form and functional groups in the soil seed bank and in the aboveground vegetation along an N–P fertilization gradient from 0 to Fer120(120 g/m2; i.e. 25.4 g N and 28.2 P m2/yr). Non-metric multidimensional scaling was used to test the similarity between soil seed bank and aboveground vegetation. Species richness of both soil seed bank and vegetation declined in response to 9 years of fertilization, but rate of decline in the seed bank was slower than that in the vegetation. Seed density did not differ along the fertilization gradient except for Fer30, which had the highest seed density. Plant density in the vegetation declined along the fertilization gradient. Proportion of annuals increased both in the vegetation and the soil seed bank along a fertilization gradient. Percentage of different functional groups in the soil seed bank changed but less than that in the vegetation. The similarity between soil seed bank and vegetation increased from Fer0to Fer90and then decreased in Fer120. Fertilization influenced species composition of the soil seed bank, but the effect was smaller than that on the aboveground vegetation. The seed bank present in spring provides high species richness and high seed densities for restoration, but restoration to the non-fertilized state would be difficult due to the shift to a higher proportion of annuals and to a low proportion of sedges along the fertilization gradient.
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影响因子：
2.8
作者：
P. Milberg;M. Hansson
通讯作者：
P. Milberg;M. Hansson
影响因子：
3.8
作者：
D. Pauli;M. Peintinger;B. Schmid
通讯作者：
D. Pauli;M. Peintinger;B. Schmid
影响因子：
4
作者：
P. Vitousek;R. Howarth
通讯作者：
P. Vitousek;R. Howarth
影响因子：
4.8
作者：
HUENNEKE, LF;HAMBURG, SP;VITOUSEK, PM
通讯作者：
VITOUSEK, PM
影响因子：
3.8
作者：
Rivera, Desiree;Jauregui, Berta M.;Peco, Begona
通讯作者：
Peco, Begona