Bessler Holger, Temperton Vicky M, Roscher Christiane, Buchmann Nina, Schmid Bernhard, Schulze Ernst-Detlef, Weisser Wolfgang W, Engels Christof
Institute of Plant Nutrition, Humboldt-University zu Berlin, Landwirtschaftlich-Gärtnerische Fakultät, FG Pflanzenernährung und Düngung, Unter den Linden 6, D-10099 Berlin, Germany.
Ecology. 2009 Jun;90(6):1520-30. doi: 10.1890/08-0867.1.
We investigated effects of plant species richness in experimental grassland plots on annual above- and belowground biomass production estimated from repeated harvests and ingrowth cores, respectively. Aboveground and total biomass production increased with increasing plant species richness while belowground production remained constant. Root to shoot biomass production ratios (R/S) in mixtures were lower than expected from monoculture performance of the species present in the mixtures, showing that interactions among species led to reduced biomass partitioning to belowground organs. This change in partitioning to belowground organs was not confined to mixtures with legumes, but also measured in mixtures without legumes, and correlated with aboveground overyielding in mixtures. It is suggested that species-rich communities invest less in belowground biomass than do monocultures to extract soil resources, thus leading to increased investment into aboveground organs and overyielding.
我们分别通过重复收割和内生长土芯，研究了实验性草地地块中植物物种丰富度对地上和地下年生物量产量的影响。地上和总生物量产量随着植物物种丰富度的增加而增加，而地下产量保持不变。混合物中的根冠生物量生产比（R/S）低于混合物中各物种单作表现的预期，表明物种间的相互作用导致地下器官生物量分配减少。这种向地下器官分配的变化不仅限于含豆科植物的混合物，在不含豆科植物的混合物中也有测量，并且与混合物中的地上超产相关。有人认为，物种丰富的群落为获取土壤资源而在地下生物量上的投入比单作少，从而导致对地上器官的投入增加和超产。
