Study on the Present Condition and the Potentialities of the Productivity of Main Tree Species Plantation of ChinaⅡ.Study on the Plantation Productivities of Eucalyptus, Larix and Pinus sylvestris var. mongolica

Based on the sample plots of forest surveying, the present productivities of the Eucalyptus plantation in three provinces, Guangdong, Guangxi and Hainan, and of the Larix plantation and of the Pinus sylvestris var. mongolica plantation in Heilongjiang Province were evaluated with climate productivities of the different provinces. The results show: (1) The present productivity levels of Eucalyptus plantations are 22.81% and 41.08% of themselves climate productivities respectively in the west regional of Guangdong Province and in Hainan Province. (2)The present productivity of the fast growing and high yield Eucalyptus plantation is 73.78% of the climatic productivity in Guangxi Province. (3) The present productivities of Larix and Pinus sylvestris var. mongolica plantation are 25.70%～41 68% and 28.45%～51.55% of the climate productivity in Heilongjiang Province. The potentialities of the main three species of plantations were studied systematically. The productivity levels of the plantations, in the present conditions of the forest management technique and economy, are advanced. The fast growing and high yield Eucalyptus plantation would be higher than 80.00% of the climate productivity. The Larix, in ≥14 site index, and Pinus sylvestris var. mongolica plantations, in ≥12 site index, would be higher than 70.00% and 80.00% of the climate productivities.