摘要
实验设计了一个水培系统,利用生活污水培养,对4种“须根型”植物美人蕉、风车草、象草和香根草和4种根茎型植物菖蒲、水鬼蕉、芦苇和水烛的根系生长进行比较研究。该系统由用于盛污水的塑料桶(顶部直径36.5cm,底部直径30.0cm,高34.5cm)和用于固定植物于水面的泡沫板构成。每桶种植1株植物,每种种5株。水培至10周时,须根型植物的平均根数达到1349条/株,而根茎型植物的平均根数只有549条/株。实验结束(水培第21周)时,须根型植物的平均根生物量为11.3g/株,根茎型植物的平均根生物量为7.4g/株。须根型植物根系中,d<1mm的细根生物量占根系总生物量的51.9%,而根茎型植物d<1mm的细根的生物量只占25.1%。根茎型植物的根生物量与地上生物量的比值为0.2,显著高于须根型湿地植物(0.1)。须根型湿地植物的根系表面积(6933 cm2/株)极显著地高于根茎型湿地植物(1897cm2/株)。根茎型湿地植物根的平均寿命(46.6d)较须根型湿地植物根的平均寿命(34.8d)长。美人蕉的平均根数达1871条/株,根表面积达到22832cm2/株,远较其他种高。
Abstract： A wastewater culture system was designed to study root growth of eight species of wetland plants. The system included a plastic barrel （ top diameter = 36.5cm, bottom diameter = 30.0cm,height = 34.5cm） for holding wastewater and a foam plate for holding the plant. Four species, i. e. , Canna indica Linn. , Cyperus alternifolius subsp, flabelliformis （Rottb.） Kukenth, Pennisetum purpureum Schum. and Vetiveria zizanioides （ Linn. ） Nash, with fibril root system and another four species, i.e. , Acorus calamus Linn. , Hymenocallis littoralis （ Jack. ） Salisb. , Phragmites communis Trin. , and Typha angustifolia Linn. with rhizomatic root system were comparatively studied. Results indicated that root growth of the plants with fibril root system was faster than that of the plants with rhizomatic root system. After ten weeks＂ cultivation, average root number of fibril root species reached 1349 per plant while average root number of the plants with rhizomatic root system only reached 549 per plant. Our study also showed that average root biomass of fibril root plants was 11.3g per plant while the average biomass of rhizomatic root plants was 7.4g per plant. Fine root biomass of diameter 〈 1mm made up 51.9% of total root biomass in fibril root plants, while it comprised only 25.1% in rhizomatic root plants. The ratio of root biomass to shoot biomass of rhizomatic root plants was 0.2, which was higher than that of fibril root plants （0.1）. Root surface area of the fibril root plants （6933 cm^2 per plant） was considerably larger than that of rhizomatic root species （1897cm^2 per plant）. Rhizomatic root species showed longer root lifespan （46.6 days） than fibril root plants （34.8 days ）. C. indica had more developed root system than other plants, with root number 1871 and root surface area 22832 cm^2 per plant.
出处
《生态学报》
CAS
CSCD
北大核心
2007年第2期450-458,共9页
Acta Ecologica Sinica
基金
广东省自然科学基金资助项目(021082)
国家自然科学基金资助项目(30470346)~~
关键词
湿地植物
须根型
根茎型
根系
生长
水培系统
wetland plants
fibril root system
rhizomatic root system
growth
wastewater culture
