結果顯示，8次降雨事件之降雨量範圍為29 至 64 mm植物生長情形玫瑰景天生長最好，波士頓腎蕨次之，最差的為六月雪，生長速率平均分別為0.053 cm/day、0.097 cm/day、0.043 cm/day，其中又以輕質土生長最好。輕質土中有機物及氮磷含量最高，且其容積密度最低、孔隙率最高，有較好的通透性。以水質項目分析，不論何種生長基層及植物皆有將雨水中和的效果，pH平均值由5.7上升至8.2。此外，在不同生長基層中硝酸鹽氮、TP及COD濃度為輕質土最高，混合土次之，陽明山土最低；硝酸鹽氮濃度分別為2.55 mg/L、1.19 mg/L、0.99 mg/L；TP分別為3.87 mg/L、0.17 mg/L、0.11 mg/L；COD分別為86.1 mg/L、17.8 mg/L、15.4 mg/L。SS與硝酸鹽氮於不同植物中有明顯的差異，SS於六月雪、玫瑰景天與波士頓腎蕨平均分別為199 mg/L、407 mg/L、448 mg/L，六月雪最低；硝酸鹽氮濃度為玫瑰景天最低，其平均分別為3.03 mg/L、0.63 mg/L、1.08 mg/L。整體來說，此研究綜合水質及植物生長情形結果為玫瑰景天搭配陽明山土逕流水水質濃度最低。
In recent, urbanization leads the more serious of the heat island effect. Green roofs have multiple environmental benefits, one of benefits is to alleviate the heat island effect, but the information related with runoff water quality of green roofs has not cleared yet. In the present study, experimental containers with 3 substrates (Yangmingshan soil, Light soil, Mix soil) and 3 plant species (Sedum nussbaumerianum hyb (Se); Nephrolepis exaltata Schott (Ne) and Serissa foetida (Sf)) were constructed. This study investigated the effect of substrates and plant species on runoff water quality and plant growth rate. The data were collected from 8 real rainfall events to analyze the runoff water quality and measure plants grown in different substrates. The water quality analysis includes pH, suspended solid (SS), nitrate (NO3--N), ammonia (NH4+-N), orthophosphate (PO43--P), total phosphorus (TP) and chemical oxygen demand (COD). Furthermore, rainfall was measured by rain gauge meter. Mix soil was prepared by mixing Yangmingshan soil with waste glass at a ratio of 3:1.
The results show that the rainfall ranged from 29 to 64 mm during 8 rainfall events. The plant growth rate of Sedum nussbaumerianum hyb (Se), Nephrolepis exaltata Schott (Ne) and Serissa foetida (Sf) were 0.053 cm/day, 0.097 cm/day, 0.043 cm/day, respectively, and those were the best grown in the Light Soil. Light Soil has the highest in organic matter, nitrogen and phosphorus content, and the lowest bulk density, the highest porosity and has a good permeability. The water quality result showed that the acid rain was neutralized in every plant species and substrates, pH average value from 5.7 to 8.2. The nitrate, TP and COD concentration was the highest in Light Soil. The nitrate concentration in Light Soil, Mix Soil (Yangmingshan soil mixed with waste glass at ratio of 3:1) and Yangmingshan soil were 2.55 mg/L, 1.19 mg/L and 0.99 mg/L, respectively. The TP concentration in Light Soil, Mix Soil and Yangmingshan soil were 3.87 mg/L, 0.17 mg/L and 0.11 mg/L, respectively. The COD concentration in Light Soil, Mix Soil and Yangmingshan soil were 86.1 mg/L, 17.8 mg/L and 15.4 mg/L, respectively. The SS and the nitrate concentration have the significant differences in the different plant species, the SS average concentration in Sf, Se and Ne were 199 mg/L, 407 mg/L and 448 mg/L, respectively. The nitrate average concentration in Sf, Se and Ne were 3.03 mg/L, 0.63 mg/L and 1.08 mg/L, respectively. It is concluded that the Sedum nussbaumerianum hyb with Yangmingshan soil has the best runoff water quality and plant growth rate.