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首页> 外文期刊>European Journal of Soil Biology >Nematodes and protozoa affect plants differently, depending on soil nutrient status.
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Nematodes and protozoa affect plants differently, depending on soil nutrient status.

机译：线虫和原生动物根据土壤养分状况对植物的影响不同。

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We grew plants in soil amended with either finely ground (<0.2 mm) or larger pieces (4*5 mm 2) of maize leaves. Finely ground material will be mineralized faster; hence nitrogen is released faster in the soil. We inoculated the soil with the plant growth inhibiting bacterium Arthrobacter BEM463, a relatively poor food source for bacterial feeders, and the plant growth promoter Sphingopyxis BEM760 which is a good food source. Protozoa and nematodes were introduced separately or in combination. In soil with larger maize leaf pieces (low turnover, slow nitrogen release), bacterial feeders generally increased plant nitrogen uptake and growth. In systems with finely ground material (high turnover, fast nitrogen release), plants hardly benefited from presence of grazers; bacterial mineralization activity alone probably provided enough N for the plants. The harmful Arthrobacter thrived better when grazed by protozoa than when grazed by nematodes, probably because the selective protozoa could avoid it, which resulted in reduced plant performance. We suggest that bacterial feeders generally increase plant performance when nutrients are limited. At high nutrient availability, however, bacterial feeders promote grazer resistant bacteria, and, if these bacteria are harmful to plants, the net effect of bacterial feeders on plant growth can be negative.
机译：我们在土壤中种植了植物，并用细磨的玉米片（<0.2毫米）或较大的片（4 * 5毫米2）进行了改良。精细研磨的材料将更快地矿化;因此氮在土壤中的释放速度更快。我们在土壤中接种了植物生长抑制细菌Arthrobacter BEM463（一种相对较差的细菌饲养食物来源）和植物生长促进剂Sphingopyxis BEM760，后者是良好的食物来源。原生动物和线虫分别或组合引入。在玉米叶片较大的土壤中（低周转，缓慢的氮释放），细菌饲养者通常会增加植物对氮的吸收和生长。在具有精细研磨材料（高周转率，快速释放氮）的系统中，植物几乎没有受益于放牧机的存在。单独的细菌矿化活性可能为植物提供了足够的氮。原生动物放牧时有害的节杆菌比线虫放牧时更好，这可能是因为选择性原生动物可以避免这种情况，导致植物性能下降。我们建议在营养有限的情况下，细菌饲养器通常可以提高植物的生长性能。但是，在养分利用率高的情况下，细菌饲养者会促进抗草食性细菌，并且，如果这些细菌对植物有害，细菌饲养者对植物生长的净效应可能是负面的。

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