Compost prepared using pruning material (PM) contains a higher amount of mineralizable carbon (C) than conventional compost, readily causing nitrogen (N) immobilization in soil due to the multiplication of microorganisms and subsequently likely causing N starvation for plant growth inhibition. However, organic matter mineralization in soil is affected by soil microbial activity, which correlates with the total C and N contents. Therefore, we hypothesized that application of PM compost to different fertility soils have different effects on plant growth depending on soil microbial activity. Using an incubation experiment, we found that the application of PM compost had a priming effect in forest soil and subsoil, causing N immobilization in both soils. However, the period of N immobilization depended on soil microbial activity, being shorter when the soil microbial activity was higher. To test the effects of PM compost on plant growth, we grew komatsuna (Brassica rapa L. var. perviridis LH Bailey) in different soils with equal applications of PM compost for 1 month. We found that PM compost application significantly inhibited plant growth in the subsoil (P < 0.05), but significantly accelerated plant growth in the forest soil (P < 0.05), suggesting that different effects are observed on plant growth in soils with different microbial activities. In conclusion, these findings indicate that the application of PM compost to soil can accelerate plant growth in soils with high microbial activities, but can inhibit plant growth in soils with low microbial activities.

中文翻译：

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修剪物料堆肥对不同土壤类型氮素动态，土壤微生物量和植物生物量的影响

与传统的堆肥相比，使用修剪材料（PM）制备的堆肥包含更高量的可矿化碳（C），由于微生物的繁殖，容易在土壤中引起氮（N）的固定化，并随后可能导致N饥饿，从而抑制了植物的生长。然而，土壤中有机质的矿化受土壤微生物活性的影响，而微生物活性与总碳和氮含量相关。因此，我们假设根据土壤微生物活性，将PM堆肥应用于不同的肥沃土壤对植物的生长有不同的影响。通过孵化实验，我们发现PM堆肥在森林土壤和土壤中具有引发作用，导致两种土壤中都固定有N。但是，固氮的时间取决于土壤的微生物活性，当土壤微生物活性较高时，其含量较短。为了测试PM堆肥对植物生长的影响，我们种植了komatsuna（芜菁L.变种。Perviridis LH Bailey）在不同土壤中，均等施用PM堆肥1个月。我们发现，PM堆肥的施用显着抑制 了土壤下的植物生长（P <0.05），但显着促进了森林土壤中的植物生长（P  <0.05），这表明在微生物活性不同的土壤中，植物生长受到了不同的影响。总之，这些发现表明，在土壤中施用PM堆肥可以促进微生物活性较高的土壤中植物的生长，但可以抑制微生物活性较低的土壤中植物的生长。