Analysis of Application Status and Recommendations for Shade-Tolerant Lawns and Ground Cover Plants in the West Lake Scenic Area

Taking 8 parks in Xihu Scenic Area as the survey objects, this study found that there are 77 kinds of shade-tolerant lawns and ground cover plants under the forest in good growth condition, and there are 3 types of application forms: dense forest, sparse forest and forest edge. In response to the existing problems, it is proposed that it is necessary to adhere to principles of ecology, adapt to local conditions and plant suitable varieties in accordance with local conditions, develop and use new varieties of wild shade-tolerant lawns and ground cover plants, and strengthen the promotion of the mixed planting model of shade-tolerant lawns and ground cover plants, so as to provide guidance for the better use of shade-tolerant lawns and ground cover under the forest in the West Lake Scenic Area in the future.

Study on Ability of Ground Cover Plant of Taiyuan to Adsorb PM(2.5)

Four ground cover plant species of Taiyuan（ Iris,Hemerocallis,Sedum,Hosta） were selected to study their capacities in adsorbing PM（2.5）. Meanwhile,the concentration of PM（2.5） in Taiyuan between April 2017 and August 2017 was recorded,and the characteristics of PM（2.5） pollution in summer and autumn in Taiyuan were studied. The results showed that for the 4 plants,the ability to adsorb PM（2.5） was in the order from great to small of Hosta,Iris,Hemerocallis,Sedum,in which H. plantaginea had the best effect to adsorb PM（2.5）. The fresh weight and dry weight per gram of H. plantaginea were 4. 4 times and 2 times higher than those of S. spectabile,while the mass quality of dust adsorption was 2.8 times higher. The sorting result was the same as the ability to adsorb PM（2.5） of unit leaf area. The result of the coefficient of purification showed that the purification coefficients of 3 vegetation structure were positive,and the combination of trees and shrubs in university campus had strong PM（2.5） adsorption capacity. By comparing the seasonal variation of PM（2.5） concentration in Taiyuan city,it found that the PM（2.5） concentration was particularly high in late spring and early summer of Taiyuan,when most of the ground cover plants were not fully grown. Therefore,ground cover plants played an important role in the construction of landscape and the regulation of ecological environment in Taiyuan.

Study on the Ground Cover Plant in Tibetan Herb Garden

This paper conducts a comprehensive survey of the ground cover plant in Tibetan herb garden for the first time using " five-point sampling method". Survey results show that:(i) A total of 46 families,95 genera,119 species of ground cover plants in herb garden are applied in Tibet,and Asteraceae,Gramineae,Leguminosae,Labiatae,Iridaceae and Liliaceae are used most,with the species number of 22,15,8,7,6 and 5,respectively,accounting for 18. 49%,12. 61%,6. 72%,5. 88%,5. 04% and 4. 20% of the plants surveyed,respectively.(ii) In terms of importance value for the herbaceous layer,the top three plants are Poa pratensis L.,Festuca arundinace and Lolium multiflorum L.,with the importance value of 45. 950,34. 610 and 29. 880,respectively; in terms of importance value for the non-turf ground cover herb plants,the top three plants are Trifolium L.,Cosmos bipinnata Cav. and Althaea rosea(Linn.) Cavan.,with the importance value of4. 372,3. 437 and 2. 062,respectively.(iii) The overall level of greening is low and uneven in the region,with large regional differences. In terms of ground cover plant abundance,Nyingchi > Lhasa > Shannan > Changdu > Xigaze > Ali > Nagqu.