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| The Community Structure of Artificial Eucalyptus Camaldulensis Stands in the Dry-Hot Valley of Jinsha River |
| Wang Keqin1,Guo Fengchun2,He Tingrong3,Wang Jianwen3,Li Jinhong2 |
1. Department of Environment Science and Engineering, Southwest Forestry University, 650224, Kunming; 2. Soil and Water Conservation Bureau, 675000,
Yuanmou County; 3. Soil and Water Conservation office, 675000, Chuxiong Yi Nationality Autonomous State: Yunnan, China |
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Abstract Through analyse on indexes in common use of community stability describing such as community structure, plant species diversity, growth yield and biomass yield, the density of artificial Eucalyptus camaldulensis forests are high widely, the structure is simple and the community stability is lower in dry-hot valley of Jinsha River. With increasing of stands density of three Eucalyptus camaldulensis form,the vegetation communities difference under forest canopy increased, there was mainly dominant species in forest (arbor species is Eucalyptus camaldulensis, the species under forest canopy is Cheteropogon contortus), the few other species was exist in forest, the vegetation layer structure under forest canopy was simple. With increasing of stands density, the species enrichment (S), Shannon-Wiener index (SW), species equality (E) and ecological dominance (ED) minished, the species diversity of community decreased, the community structure changed to badness. The growth yield and biomass yield of community reduced with increasing of stands density also. The biomass yield of the lowest density forest (F1) was more than the double of that one of the other higher density forest. The tree growth of all forests was slowness. The average annual growth quantity of diameter and height was 0.72cm and 0.78m respectively even in the lowest density forest (F1). To improve the stability of artificial arbor community and advance their positive succession in Jinsha River dry-hot valley, bring into play their ecological function, it is should be considered to reduce the arbor layer community density of artificial forest.
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Received: 12 April 2004
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