Physical stress and diversity-productivity relationships: The role of positive interactions
Physical stress and diversity-productivity relationships: The role of positive interactions
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DOI：
10.1073/pnas.111055298
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发表时间：
2001-06-05
影响因子：
11.1
通讯作者：
Doak, DF
中科院分区：
文献类型：
--
作者：
Mulder, CPH;Uliassi, DD;Doak, DF
如果环境压力为植物物种丰富度和生产力之间的正相关关系提供了条件，那么在恒定条件下看似功能冗余的物种可能会在可变条件下增加群落功能。利用自然共生的苔藓和苔类植物，我们构建了苔藓植物群落，以测试在恒定条件下和实验干旱条件下物种多样性（1、2、4、8、16、24或32种）和生产力之间的关系。在一定条件下，物种丰富度与生物量之间不存在相关性，但在实验干旱条件下，生物量随物种丰富度的增加而增加。单个物种的反应表明，促进性相互作用比采样效应或生态位互补更能解释结果——几乎所有物种的存活率都增加了，而在单一栽培中，抗旱性最低的物种的生物量增加最多。积极的相互作用可能是在压力环境条件下将高多样性与高生产力联系起来的一个重要但以前未得到重视的机制。
if environmental stress provides conditions under which positive relationships between plant species richness and productivity become apparent, then species that seem functionally redundant under constant conditions may add to community functioning under variable conditions. Using naturally co-occurring mosses and liverworts, we constructed bryophyte communities to test relationships between species diversity(1, 2, 4, 8, 16, 24, or 32 species) and productivity under constant conditions and when exposed to experimental drought. We found no relationship between species richness and biomass under constant conditions, However, when communities were exposed to experimental drought, biomass increased with species richness. Responses of individual species demonstrated that facilitative interactions rather than sampling effects or niche complementarity best explained results-survivorship increased for almost all species, and those species least resistant to drought in monoculture had the greatest increase in biomass. Positive interactions may be an important but previously underemphasized mechanism linking high diversity to high productivity under stressful environmental conditions.