Evaluation And Selection Of Platyciadus Orientalis(L.) Franco Provenance In Yuanshan National Forest Park

Platycladus orientalis(L.)Franco was an important tree species for afforestation and greening in China with the resistance of drought and barren,which was also an important species in limestone mountain area. The research of different geographical provenances of arborvitae was in order to explore the growth performance of provenances and adaptation to environments, and select excellent provenances. So as to provide a scientific evidences for seed transfer reasonable.This article studied on the basis of Platycladus orientalis(L.) Franco in Yuanshan forest farm. This study through arborvitae growth, cold tolerance, drought resistance analysis and keep rate, based Yuanshan national forest park arborvitae species suitable source selection, and then for the provenance division.The main conclusions are as follows:1.Different oriental arborvitae provenance growth index analysis. Increment data through comprehensive analysis test that, the differences of provenances are significantly, there was no significant difference between the block. Therefore, the comprehensive view, the original forest field growth better provenance of Dongling, Changqing, Pingyin..2.Different provenances cold resistance of P. orientalis.This study adopts cold injury investigation,leaf water content, blade conductivity index various evaluation cold injury.According to the frost resistance research results,Therefore, the comprehensive view, the original forest field frost-resistant better provenance of Xuyi, Shanxi,Hebei,Henan expect Yuxian, the second is Shandong.The difference of frost between above areas by provenance is little.3. Drought resistance of different provenances displayed. To analysis the drought resistance,we take the branch water retention rate and the leaf anatomical structure way to carry on the analysis. Research shows that Oriental arborvitae blade cuticle developed, palisade tissue ratio is high, leaf epidermal thicker. Therefore, the comprehensive view, the original forest field drought resistance better provenance of Queshan, Huolu, Shehong..4. Different provenances keep rate of P. orientalis.Keep rate is an important part of forest provenance test,the index is all of the resistance factors in the macroscopic collection,to be able to accurately reflect the different provenance individual in the natural conditions of the resistance. Therefore, the comprehensive view, the original forest field keep rate better provenance of Cangshan, Yuanshan, Xichuan..5. Different provenances tree form selection of P. orientalis. Good tree form type, Not only to the Oriental arborvitae growth have promote role, but also could improve the tree body aesthetic felling, improve its beautify the environment effect.6. In order to adjust measures to local conditions and link theory with practice,promote the development of the forestry production, we adopt not only the traditional selection index,such as growth index,resistance factors,etc,but also tree selection index which is more appropriate to the Yuanshan national forest park in the management of Platycladus orientalis provenance characteristic individuality demand for selecting the provenance which is suitable for the Yuanshan national forest park.