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The effect of different soil core samplers on precision of estimating weed seedbank in soil

机译：不同土壤核心取样器对土壤杂草种子库估算精度的影响

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The effect of different soil sampling procedures on the precision of estimating the weed seedbank in soil using three soil core samplers with a circular base of 1.3, 6.4 and 8.0 cmin diameter was studied in a model experiment. The results showed the importance of a methodological approach. The soil sampler with a larger diameter is more useful for the objective assessment of the species spectrum (detection of seeds of all weed species in the soil). Furthermore, the value of the coefficient of variation (vx) decreases along with the increasing diameter of the soil sampler. The value of vx assessed in partial samples taken with a sampler of 1.3 cm diameter was double to three times higher than for soil samplers of 6.4 and 8.0 cm. The value of vx increased in individual weed species at decreasing seed frequency in individual partial samples from 17.82 to 316.23%. The soil core with the diameter of8.0 cm on the area of1 m2 is optimal for the exact research. To estimate the weed seedbank in soil in small-plot experiments, one partial sample on the area of5 m2 is recommended. To obtain comparable results, it is necessary to take a higher number of samples at a decreasing diameter of the soil sampler. Likewise, a larger amount of samples is needed to detect less abundant species.
机译：在模型实验中，研究了使用三种圆形，直径分别为1.3、6.4和8.0厘米的土壤核心采样器，不同土壤采样程序对估算土壤杂草种子库精度的影响。结果表明了方法论方法的重要性。直径较大的土壤采样器对于物种谱的客观评估（检测土壤中所有杂草物种的种子）更有用。此外，变异系数（vx）的值随着土壤采样器直径的增加而减小。用直径为1.3厘米的采样器采集的部分样品的vx值是6.4和8.0厘米土壤采样器的两倍至三倍。 vx的值在单个杂草物种中以较低的种子频率从单个杂草物种中增加，从17.82％增至316.23％。在1 m2的面积上直径为8.0 cm的土芯是进行精确研究的最佳选择。为了在小规模试验中估算土壤中的杂草种子库，建议在5平方米的区域上进行一份局部采样。为了获得可比的结果，有必要在土壤取样器直径减小的情况下采集更多数量的样品。同样，需要大量样本来检测数量较少的物种。

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