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Plant biomass production and soil nitrogen in mixtures and monocultures of old field Mediterranean annuals

机译:地中海田间多年生植物的混合物和单一栽培中的植物生物量生产和土壤氮

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We examine the relationship between plant diversity and ecosystem properties in a Mediterranean grassland. Five legumes, three grasses and two forb species are grown in monocultures and compared with mixtures that include these ten species. Trifolium angustifolium L. (a legume), Lolium rigidum Gaudin (a grass), and Centaurea solstitialis L. (a forb), are replicated in monocultures. Plant cover, root length and biomass, and concentrations of soil nitrate and ammonium are measured in all plots in March and May. Aboveground biomass is measured at a final harvest in late May to early June. Root biomass is significantly higher in the species mixtures than the average of the monocultures. Plant cover and root length are marginally significantly higher (0.05 < P less than or equal to 0.1) in the mixtures compared to the average of the monocultures. Soil inorganic nitrogen concentrations and aboveground biomass do not significantly differ between the average of the monocultures and the mixtures. Aboveground biomass in T angustifolium monocultures is significantly higher than in the mixtures, and on average the legume monocultures do not differ significantly from the mixtures. Root length and biomass in L. rigidum monocultures are higher than in the mixtures in March. Nitrate concentrations (which are negatively correlated with root length and biomass) are the lowest in C solstitialis in May. Thus, we have evidence that some of the measures of ecosystem performance decline in the average of the monocultures when compared with the mixtures, but mixtures never outperform or do more poorly than the best performing monocultures. (C) 2003 Editions scientifiques et medicales Elsevier SAS. All rights reserved. [References: 26]
机译:我们研究了地中海草原中植物多样性与生态系统特性之间的关系。在单一栽培中种植了五种豆科植物,三种草和两种forb种,并与包括这十种的混合物进行了比较。在单一培养物中复制了三叶草(豆科植物),硬叶黑麦草高迪(草)和半致死玉米(Centaurea solstitialis L.(forb))。在3月和5月的所有地块中,都测量了植物的覆盖率,根长和生物量以及土壤硝酸盐和铵的浓度。在5月下旬至6月初的最终收获期测量地上生物量。物种混合物中的根生物量显着高于单培养的平均值。与单一栽培的平均值相比,混合物中的植物覆盖率和根长略高(0.05

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