Biomass production effciency controlled by management in temperate and boreal ecosystems
Biomass production effciency controlled by management in temperate and boreal ecosystems
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DOI：
10.1038/ngeo2553
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发表时间：
2015-11-01
影响因子：
18.3
通讯作者：
Janssens, I. A.
中科院分区：
文献类型：
--
作者：
Campioli, M.;Vicca, S.;Janssens, I. A.
植物通过光合作用获取碳，以维持生物质生产、自养呼吸和生产非结构性化合物的多种用途(1)。用于生物质生产的光合作用生产的比例，即生物质生产效率(2)，是太阳能转化为生物质的关键决定因素。在森林生态系统中，生物量生产效率被认为与立地肥力有关(2)。在这里，我们展示了来自131个地点的生物质生产效率数据库，这些数据库是通过使用收获、生物计量、涡流相关方差或基于过程的生产模型估计进行的个体研究汇编而成的。该数据库是全球性的，但主要是来自欧洲和北美的数据。研究表明，控制陆地生态系统生物量生产效率的关键因素不是场地肥力，而是生态系统管理。此外，在天然林、草原、冻土带、北方泥炭地和沼泽中，生物质生产效率不受植被、环境和气候驱动因素的影响。生物量生产效率在不同自然生态系统类型中的相似性表明，生物量生产与总初级生产力的比例在不同自然生态系统中是恒定的。我们认为，植物适应在高肥力和低肥力的自然系统中导致相似的生长效率，但在管理条件下的养分流入有利于碳投资从地下非结构性化合物的通量转向地上生物量。
Plants acquire carbon through photosynthesis to sustain biomass production, autotrophic respiration and production of non-structural compounds for multiple purposes(1). The fraction of photosynthetic production used for biomass production, the biomass production efficiency(2), is a key determinant of the conversion of solar energy to biomass. In forest ecosystems, biomass production efficiency was suggested to be related to site fertility(2). Here we present a database of biomass production effciency from 131 sites compiled from individual studies using harvest, biometric, eddy covariance, or process-based model estimates of production. The database is global, but dominated by data from Europe and North America. We show that instead of site fertility, ecosystem management is the key factor that controls biomass production efficiency in terrestrial ecosystems. In addition, in natural forests, grasslands, tundra, boreal peatlands and marshes, biomass production efficiency is independent of vegetation, environmental and climatic drivers. This similarity of biomass production efficiency across natural ecosystem types suggests that the ratio of biomass production to gross primary productivity is constant across natural ecosystems. We suggest that plant adaptation results in similar growth efficiency in high- and low-fertility natural systems, but that nutrient influxes under managed conditions favour a shift to carbon investment from the belowground flux of non-structural compounds to aboveground biomass.