8种湿地植物根部泌氧速率的研究

Study on Rate of Roots Radial Oxygen Loss of Eight Wetland Plants

为了更好地利用人工湿地净化污水，对8种湿地植物美人蕉、马蹄莲、茭草、菖蒲、香蒲、旱芦苇、矮茨菇和水芹菜进行了缺氧营养液培养，并对其根系泌氧速率进行了测定。结果表明，在光照强度为30μmol／（m^2·s），温度为25℃，湿度为50％时，缺氧营养液培养的湿地植物中，菖蒲的根系泌氧速率最大，为6．736gmol／（h·g·root），旱芦苇根系泌氧速率最小，为1．208μmol／（h·g·root），泌氧速率大小为：菖蒲〉矮茨菇〉马蹄莲〉茭草〉香蒲〉水芹菜〉美人蕉〉旱芦苇。相同光照条件下，在黑暗中植物根部泌氧速率有不同程度的减少，矮茨菇、菖蒲、马蹄莲和水芹菜变幅较大，其根系泌氧速率降低0．9～4．8μmol／（h·g·root），其他4种湿地植物根系泌氧速率降低0．01～O．26μmol／（h·g·root）。

The rate of root radial oxygen loss of eight wetland plants （C. indica, Zantedeschia aethiopica Spreng, Zizania Caduci flora ,Acorus calamus, Typhaangusti folia, Phragmites sp. , Sagittaria pygmaee Miq and Oenanthe stolonifera D. C. ） cultivated in deoxygenated nutrient solution was determined to study sewage purification of artificial wetland by wetland plants. The results showed that the rate of root radial oxygen loss of Acorus calamus, and Phragmites sp. was 6. 736μmol/（h·g·root） and 1. 208μmol/（h·g·root）under the conditions of 30μmol/（m^2 ·s） light intensity, 25℃ and 50% humidity, and the rate of root radial oxygen loss was Acorus calamus 〉Sagittaria pygmaee〉Zantedeschia aethiopica〉 Zizania Caduci flora 〉 C. indica 〉 Typhaangusti folia 〉 Oenanthe stoloni fera 〉 Phragmites. The rate of root radial oxygen loss of 8 tested wetland plants in darkness decreased to varying degrees under the same light intensity, and the decreased range of Sagittaria pygmaee, Acorus calamus, Zantedeschia aethiopica and Typhaangustifolia, was 0. 9 -4. 8μmol/（h·g·root） and the decreased range of other wetland plants was 0.01-0.26μmol/（h ·g·root）.