Study on the conservation management techniques of Sedum lineare at the roof greening of Beijing city

The trial goal was to define the conservation standard of Sedum lineare in roof greening. The annual water requirement and irrigation time were determined, the plant growth and diseases and insect pests occurrence were investigated, the pruning time and weeds control method were determined. The results showed that the moisture content of roof greening substrate and plant water content of S. lineare were not correlated. When the substrate was 6 cm and plant height was 8 cm to 12 cm, the annual adaptive watering amount was 361.45 mm. If the substrate was 10 cm and plant height was 25 cm to 30 cm, the annual watering amount was 533.90 mm. There was usually physiological disease on S. lineare induced by the alternation of the water log and excessive drought. The main insect pests were aphid and snail of S. lineare, but no serious damage was observed. Moderate pruning could prolong the green period of S. lineare in autumn. The optimum pruning length was 1/3 to 1/2 of the plant height. Weeds control was an important measure for the conservation of S. lineare. The artificial irrigation was necessary for the conservation management of S. lineare, such as regeneration watering, dry and hot season and winter irrigation.