Plant diversity effects on aboveground and belowground N pools in temperate grassland ecosystems: Development in the first 5 years after establishment
Plant diversity effects on aboveground and belowground N pools in temperate grassland ecosystems: Development in the first 5 years after establishment
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DOI：
10.1029/2010gb003869
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发表时间：
2011-05-25
影响因子：
5.2
通讯作者：
Wilcke, Wolfgang
中科院分区：
文献类型：
--
作者：
Oelmann, Yvonne;Buchmann, Nina;Wilcke, Wolfgang
生物多样性有望改善生态系统服务，例如：例如，在一个实施例中，生产力或渗水水质。植物多样性对元素循环的影响目前的观点是基于短期的草地研究，折扣可能缓慢地下反馈到地上的多样性。此外，这些草地建立在以前的耕地与土壤性质的变化，如。例如，在一个实施例中，有机质的积累。我们假设，植物多样性与N循环的关系随着时间的推移，因为建立。我们评估了植物多样性与（1）地上和土壤氮储量和（2）土壤中NO3-N和NH 4-N的有效性之间的关系在2003年和2007年之间的耶拿实验，草地实验成立于2002年，其中植物物种的数量从1到60不等。植物多样性对地上部氮储量的正效应（主要由生物量驱动）随着时间的推移而增加。2003年后，植物多样性与土壤NO3-N有效性之间最初的负相关关系消失。2006年和2007年，植物多样性与土壤NH 4-N有效性呈正相关，与土壤全N矿化量呈正相关。我们的结论是，植物多样性的N循环关系在新建立的草地随着时间的推移而变化，因为在土壤中的有机质的积累与建立。虽然植物多样性和土壤氮储量之间的正相关关系，提高土壤肥力，减少土壤养分的需求，越来越封闭的N循环与植物多样性的增加所示的不同混合物中的NO3-N浓度降低农业N淋溶对地下水资源的负面影响。
Biodiversity is expected to improve ecosystem services, e. g., productivity or seepage water quality. The current view of plant diversity effects on element cycling is based on short-term grassland studies that discount possibly slow belowground feedbacks to aboveground diversity. Furthermore, these grasslands were established on formerly arable land associated with changes in soil properties, e. g., accumulation of organic matter. We hypothesize that the plant diversity-N cycle relationship changes with time since establishment. We assessed the relationship between plant diversity and (1) aboveground and soil N storage and (2) NO3-N and NH4-N availability in soil between 2003 and 2007 in the Jena Experiment, a grassland experiment established in 2002 in which the number of plant species varied from 1 to 60. The positive effect of plant diversity on aboveground N storage (mainly driven by biomass production) tended to increase through time. The initially negative correlation between plant diversity and soil NO3-N availability disappeared after 2003. In 2006 and 2007, a positive correlation between plant diversity and soil NH4-N availability appeared which coincided with a positive correlation between plant diversity and N mineralized from total N accumulated in soil. We conclude that the plant diversity-N cycle relationship in newly established grasslands changes with time because of accumulation of organic matter in soil associated with the establishment. While a positive relationship between plant diversity and soil N storage improves soil fertility and reduces fertilizing needs, increasingly closed N cycling with increasing plant diversity as illustrated by decreased NO3-N concentrations in diverse mixtures reduces the negative impact of agricultural N leaching on groundwater resources.