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The evergreen trees, Chinese fir and Pinus massoniana, are mainly distributed in subtropical regions of China. Aiming at the declining productivity of woodlands, poor stability of forest community, vulnerability to diseases and pests, and other problems engendered by continuous planting of artificial Chinese fir and Pinus massoniana monoculture plantation, the Experimental Center of Tropical Forestry in Guangxi adopted the following technologies to transform it.

Local rare broad-leaved trees were planted under the canopy of Chinese fir and Pinus massoniana, and the best combination methods were tested and demonstrated. The dynamic regulation technology of transmissivity of upper forest trees was adopted and the tending measures for forests with the respective thinning intensities of 30%, 45% and 60% were implemented. The supporting management technology for the efficient multi-functional close-to-nature forests was adopted for the conversion of inefficient Chinese fir and Pinus massoniana monoculture plantation to the local broad-leaved forest.

The close-to-nature transformation of the Chinese fir and Pinus massoniana monoculture plantation was effective for breeding Pinus massoniana and Chinese fir, as it could greatly shorten the cultivation cycle of large-diameter trees, thus quickly form the uneven aged mixed conifer and broad-leaved forest, obviously increase the stand biodiversity, and further enhance the forest ecological stability, so that the sustainable management ability of forest could be strengthened. (Experimental Center of Tropical Forestry)

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Demonstration sample of the close-to-nature transformation technology of Chinese fir and Pinus massoniana monoculture plantation

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Comparison of Pinus massoniana and Chinese fir stand before and after close-to-nature transformation
The Pinus massoniana stand before transformation
The Pinus massoniana stand after transformation
The Chinese fir stand before transformation
The Chinese fir stand after transformation

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