Analysis of physical property and soil chemistry in the rooftop garden soil.

我们证实，在屋顶花园的土壤中，土壤中的大量肥料成分在完工后不久就被降雨或灌溉淋失了。据估计，每平方米10厘米厚的薄层土层，通过438至688升的降雨或灌溉，土壤中的大部分肥料成分都可以达到。此外，在我们检查了每种土壤材料的肥料组分的量并明确了淋失的原因后，发现树皮堆肥的成分有被淋失的趋势。结果表明，利用不含树皮堆肥的珍珠岩、泥炭苔藓、沸石等不含树皮堆肥的园林土壤组成作为屋顶花园的薄层土床，可以在保持草坪生长和质量的同时，减少化肥淋失，建设屋顶花园。

We confirmed that a large amount of fertilizer components in soil has been leached by rainfall or irrigation soon after completion in the case of the soil for rooftop garden. It was estimated that most of the fertilizer components in soil could be reached by 438 to 688 liters of rainfall or irrigation for one square meter of thin layer soil bed with 10 cm thickness. In addition, it was found that the components of bark compost had the tendency to be leached most after we examined the amounts of fertilizer components for each soil material and specified the cause of leaching. It became clear that we could construct rooftop gardens with less fertilizer leaching while maintaining growth and quality of the turf by using garden soil composition which did not contain bark compost such as perlite, peat moss and zeolite for thin layer soil bed of rooftop garden.