Understory Plant And Soil Animal Biodiversity Of Spruce Plantation Structural Adjustment In Subalpine Of Western Sichuan

Forest biodiversity is a critical indicators to measure forest quality change to some extent, the higher biodiversity is not only the basis for ecosystem stability, but also be to promote ecosystem function optimization. Structure regulation as the main measure of forest management is the main factor which affects affect biodiversity within forest ecosystems. It creates a good environment for the growth of trees, improves forest quality, changes forest biodiversity, and affectes the ecological functions of forests. The initial planting density and canopy of spruce (Picea asperata) plantation in subalpine of western Sichuan is too large, So there were only a small number of herbaceous and almost no shrubs understory. The spruce plantation ecological functions are in a degraded condition, and its production functions are very low. This study researched vegetation diversity and soil animal diversity of artificial promotion regeneration forest gaps of different size (50 m2,100 m2,150 m2), natural regeneration gaps of different sizes (50 m2,100 m2,150 m2), diferent thinning intensity (10%,20%,30%,50%) and control comparison (CK) in Miyaluo forest area of subalpine of western Sichuan by using sampling quadrats method. The results were mainly as follows:(1) 2378 plants were recorded under the artificial promotion regeneration forest gaps of different size in spruce plantation. 368 from 12 genuses in control comparison,654 from 18 genuses in 50 m2 gap,525 from 18 genuses in 100 m2 gap, and 831 from 24 genuses in 150 m2 gap were recorded. As the gap size increases, the number of species and individual increased of understory plants.2248 soil animals were recorded under the artificial promotion regeneration forest gaps of different size in spruce plantation.481 from 12 groups in control comparison,591 from 17 groups in 50 m2 gap,552 from 15 groups in 100 m2 gap, and 624 from 14 groups in 150 m2 gap were recorded. As the gap size increases, the number of groups decreased and the number of individual increased of soli animals. Considered plant diversity and soil animal diversity, optimal treatment of artificial promotion regeneration forest gaps of different size in spruce plantation may be between 50 m2 gap and 100 m2 gap.(2) 2423 plants were recorded under the natural regeneration gaps of different sizes in spruce plantation. 368 from 12 genuses in control comparison,477 from 19 genuses in 50 m2 gap,588 from 25 genuses in 100 m2 gap, and 990 from 28 genuses in 150 m2 gap were recorded. As the gap size increases, the number of species and individual increased of understory plants.2061 soil animals were recorded under the natural regeneration gaps of different sizes in spruce plantation.481 from 12 groups in control comparison,638 from 16 groups in 50 m2 gap,479 from 12 groups in 100 m2 gap, and 463 from 15 groups in 150 m2 gap were recorded. As the gap size increases, the groups have no obviously changing and he number of individual decreased of soil animals. Considered plant diversity and soil animal diversity, optimal treatment of artificial promotion regeneration forest gaps of different size in spruce plantation may be 50 m2 gap.(3) 3911 plants were recorded under the diferent thinning intensity in spruce plantation. 368 from 12 genuses in control comparison,502 from 16 genuses in 10% thining intensity, 768 from 18 genuses in 20% thining intensity,1285 from 25 genuses in 30% thining intensity and 988 from 20 genuses in 50% thining intensity were recorded. As the thinning intensityincrease, he number of species and individual increased of understory plants.2853 soil animals were recorded under the diferent thinning intensity in spruce plantation.481 from 12 groups in control comparison,411 from 15 groups in 10% thining intensity,601 from 14 groups in 20%thining intensity,575 from 13 groups in 30% thining intensity and 787 from 13 groups in 50% thining intensity were recorded. As the thining intensity increases, the number of groups decreased and the number of individual increased of soli animals. Considered plant diversity and soil animal diversity, optimal treatment of diferent thinning intensity in spruce plantation may be 20% thining intensity.(4) The correlation between vegetation richness and soil animals richness index correlation is not significant (P> 0.05), the correlation between vegetation richness and soil animals Shannon-Wiener, Simpson, Pielou are significant(P<0.01). The correlation between vegetation Shannon-wiener and soil animals richness index correlation is not significant (P> 0.05), the correlation between vegetation Shannon-wiener and soil animals Shannon-Wiener, Simpson, Pielou are significant(P<0.01). The correlation between vegetation Simpson and soil animals richness index correlation is not significant (P> 0.05), the correlation between vegetation Simpson and soil animals Shannon-Wiener is significant(P<0.05), the correlation between vegetation Simpson and soil animals Simpson, Pielou are significant(P<0.01). The correlation between vegetation Pielou and soil animals richness, Shannon-wiener, Simpson, Pielou are not significant (P> 0.05).