Grassland resistance and resilience after drought depends on management intensity and species richness.
Grassland resistance and resilience after drought depends on management intensity and species richness.
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干旱后的草原耐药性和韧性取决于管理强度和物种丰富度。
DOI：
10.1371/journal.pone.0036992
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发表时间：
2012
期刊：
影响因子：
3.7
通讯作者：
Weigelt A
中科院分区：
文献类型：
--
作者：
Vogel A;Scherer-Lorenzen M;Weigelt A
生物多样性在气候变化（如夏季长期干旱）下促进草原稳定性的程度引起了相当大的兴趣。迄今为止的研究得出了不一致的结果，此外，不同的草原管理措施对它们对干旱的反应的影响仍然是一个悬而未决的问题。实验中，我们结合了夏季长期干旱（有遮蔽与无遮蔽地点）、植物物种损失（从60种减少到1种的6个水平）和管理强度（4个水平，刈割频率和施肥量不同）的操纵。稳定性是指草地地上生物量生产对夏季降水减少的抗性和恢复力，其中抗性是干旱诱导后直接干旱处理之间的差异，恢复力是第二年春季干旱处理之间的差异。我们假设：(1)在干旱条件下，管理强化放大了生物量的减少；(2)抗性随着物种丰富度的增加和管理强化而降低；(3)恢复力随着物种丰富度的增加和管理强化而增加。研究发现，草地对夏季干旱的抗性和恢复力高度依赖于管理强度，部分依赖于物种丰富度。在我们研究的两个年份中，有一年频繁刈割降低了草地的抗旱性，而物种丰富度的增加则降低了抗旱性。只有在最高管理处理下，恢复力与物种丰富度呈正相关。结果表明，相对于物种丰富度，低刈割频率对提高抗旱性更为重要。然而，在干旱和环境条件下，物种丰富度增加了所有管理处理的地上生产力，因此在未来气候条件下应保持。
The degree to which biodiversity may promote the stability of grasslands in the light of climatic variability, such as prolonged summer drought, has attracted considerable interest. Studies so far yielded inconsistent results and in addition, the effect of different grassland management practices on their response to drought remains an open question. We experimentally combined the manipulation of prolonged summer drought (sheltered vs. unsheltered sites), plant species loss (6 levels of 60 down to 1 species) and management intensity (4 levels varying in mowing frequency and amount of fertilizer application). Stability was measured as resistance and resilience of aboveground biomass production in grasslands against decreased summer precipitation, where resistance is the difference between drought treatments directly after drought induction and resilience is the difference between drought treatments in spring of the following year. We hypothesized that (i) management intensification amplifies biomass decrease under drought, (ii) resistance decreases with increasing species richness and with management intensification and (iii) resilience increases with increasing species richness and with management intensification. We found that resistance and resilience of grasslands to summer drought are highly dependent on management intensity and partly on species richness. Frequent mowing reduced the resistance of grasslands against drought and increasing species richness decreased resistance in one of our two study years. Resilience was positively related to species richness only under the highest management treatment. We conclude that low mowing frequency is more important for high resistance against drought than species richness. Nevertheless, species richness increased aboveground productivity in all management treatments both under drought and ambient conditions and should therefore be maintained under future climates.
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影响因子：
5.5
作者：
Joshi, J;Matthies, D;Schmid, B
通讯作者：
Schmid, B
影响因子：
5.2
作者：
MACGILLIVRAY, CW;GRIME, JP;THORPE, PC
通讯作者：
THORPE, PC
影响因子：
4.9
作者：
De Boeck, H. J.;Lemmens, C. M. H. M.;Ceulemans, R.
通讯作者：
Ceulemans, R.
DOI：
10.1007/bf00120678
发表时间：
1982-01-01
期刊：
VEGETATIO
影响因子：
--
作者：
LEPS, J;OSBORNOVAKOSINOVA, J;REJMANEK, M
通讯作者：
REJMANEK, M
影响因子：
64.8
作者：
Pfisterer, AB;Schmid, B
通讯作者：
Schmid, B