Effects of Different Tending Measures on Growth Dynamics of Eucalyptus urophylla × Eucalyptus grandis Plantation and Variation of Vegetation Diversity Under Forest

In order to research the dynamic effects of 2 tending measures for the growth of Eucalyptus urophylla ×Eucalyptus grandis plantation and understory vegetation, chose E.urophylla × E.grandis plantation in the Xipi state-owned forest farm of Huaan County in Fujian Province, including spot tending and sequence of strip tending to carry out 3 years orientation observation. The results show that 2 tending measures reach significant level on the tree height, DBH and individual volume of E.urophylla × E.grandis plantation. The tree height, DBH and individual volume of E.urophylla × E.grandis plantation that has been sequence of strip tending have reached the highest. There are differences in undergrowth vegetation of E.urophylla × E.grandis plantations under 2 tending measures, spot tending have great advantages in increasing the number of understory vegetation. Understory vegetation richness, community coverage, shannon wiener diversity index, simpson diversity index and pielou evenness index is the highest under the spot tending. Therefore, when the growth of E.urophylla × E.grandis factor is the main factor, best use of sequence of strip tending; with underforest vegetation as the main factor, best use of spot tending.