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Interpreting forest diversity-productivity relationships:volume values,disturbance histories and alternative inferences

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Forest Ecosystems 2020年第1期7卷 64-75页

作者： Douglas Sheil frans bongers Faculty of Environmental Sciences and Natural Resource Management(MINA) Norwegian University of Life Sciences(NMBU)Box 50031432 AsNorway Forest Ecology and Forest Management Group Wageningen University&ResearchPO Box 476700 AA WageningenThe Netherlands

Understanding the relationship between stand-level tree diversity and productivity has the potential to inform the science and management of *** shows that plant diversity-productivity relationships are challenging to interpret—and this remains true for the study of forests using non-experimental field *** we highlight pitfalls regarding the analyses and interpretation of such *** examine three themes:1)the nature and measurement of ecological productivity and related values;2)the role of stand history and disturbance in explaining forest characteristics;and 3)the interpretation of any *** show that volume production and true productivity are distinct,and neither is a demonstrated proxy for economic *** stand characteristics,including diversity,volume growth and productivity,vary intrinsically with succession and stand *** should be characterising these relationships rather than ignoring or eliminating *** to do so may lead to misleading *** illustrate,we examine the study which prompted our concerns—Liang et al.(Science 354:aaf8957,2016)—which developed a sophisticated global analysis to infer a worldwide positive effect of biodiversity(tree species richness)on“forest productivity”(stand level wood volume production).Existing data should be able to address many of our *** evaluations will improve understanding.

关键词： Causation Correlation Diversity Inference Productivity Richness Tree-growth Wood-density

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Arbuscular mycorrhizal impacts on competitive interactions between Acacia etbaica and Boswellia papyrifera seedlings under drought stress

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Journal of Plant Ecology 2014年第3期7卷 298-308页

作者： Emiru Birhane Frank J.Sterck frans bongers Thomas W.Kuyper Forest Ecology and Forest Management Group Wageningen UniversityPO Box 476700 AAWageningenThe Netherlands Land Resources Management and Environmental Protection Mekelle UniversityPO Box 231MekelleEthiopia Department of Soil Quality Wageningen UniversityPO Box 476700 AA WageningenThe Netherlands

Aims Arbuscular mycorrhizal fungi can have a substantial effect on the water and nutrient uptake by plants and the competition between plants in harsh environments where resource availability comes in *** this study we focus on interspecific competition between Acaia etbaica and Boswellia papyrifera that have distinctive resource acquisition *** compared the extent of interspecific competition with that of intraspecific *** In a greenhouse study we examined the influence of Arbuscular Mycorrhiza(AM)and pulsed water availability on competitive interactions between seedlings of the rapidly growing species *** and the slowly growing species ***.A factorial experimental design was *** factors were AM,two water levels and five species combinations Important Findings Seedlings of both species benefitted from AM when grown alone,and the positive growth response to pulsed water availability in *** seedlings was in contrast with the negative growth response for *** *** also affected the competitive performance of both *** was not affected by intraspecific competition,whereas *** was negatively affected compared to the seedlings grown *** effect was stronger in the presence of *** interspecific competition,*** outcompeted *** and pulsed water availability did not affect the outcome of interspecific competition,and the aggressivity index of *** remained *** extent to which AM influences plant competition in a droughtstressed environment may depend on belowground functional traits of the *** and pulsed water availability could modify the balance between intraspecific and interspecific *** affecting the balance between intraspecific and interspecific competition,both factors could impact the establishment and survival of seedlings.

关键词： competition relative yield conservative acquisitive functional traits

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