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Yao R.L.,GuangXi Zhuang Autonomous Region Forestry Research Institute | Yao R.L.,Southern Cross University of Australia | Yao R.L.,Key Laboratory of Central South Fast growing Timber Cultivation of Forestry Ministry of China | Yao R.L.,Guangxi Key Laboratory of Superior Timber Trees Resource Cultivation | And 2 more authors.
Southern Forests

In eucalypt plantations in subtropical Australia, Eucalyptus dunnii exhibits greater diameter increment after thinning than more shade-tolerant Corymbia citriodora. To elucidate the mechanism underlying this difference, we investigated relationships between tree leaf area and sapwood area following thinning in 11-year-old E. dunnii and C. citriodora plantations. There was no significant difference in specific leaf area (SLA) between thinned and unthinned stands in E. dunnii and C. citriodora, whereas crown zone significantly affected SLA in the two eucalypts. At the whole-tree level non-linear leaf area (Al)-sapwood area (As) relationships were measured in both eucalypts by thinning treatment. A significant increase in Al/As ratio was only observed at the upper crown in thinned E. dunnii. The present results suggested the plastic nature of response of leaf characteristics in both eucalypts grown in different light environments and the species-specific pattern of crown-zone leaf responses to thinning in the two species, i.e. the top of the canopy appears to be driving greater growth response to thinning in the less shade tolerant E. dunnii compared with the more shade-tolerant C. citriodora. It is concluded that different thinning regimes should be applied in shade-tolerant and shade-intolerant eucalypt forests. © 2014 Copyright © NISC (Pty) Ltd. Source

He Q.-F.,Guangxi Mangrove Research Center | He Q.-F.,GuangXi Zhuang Autonomous Region Forestry Research Institute | He Q.-F.,Ministry of Forestry Key Laboratory of Central South Fast growing Timber Cultivation | He Q.-F.,Guangxi Key Laboratory of Superior Timber Trees Resource Cultivation | And 6 more authors.
Chinese Journal of Applied Ecology

Digging Phascolosoma esculenta to increase income is one of the main causes leading to the degradation of China mangroves. In order to understand the impact mechanisms of digging P. esculenta on the mangrove growth and to select indicators to evaluate the mangrove health, a simulative study was conducted to clarify the impacts of digging depth, radian, and frequency on the growth of 1-year old Avicennia marina seedlings, with the indices seedling height, basal diameter, single leaf area, specific leaf area, total biomass, and dead root dry mass measured. The results showed that digging activities decreased the increment of seedling height and basal diameter, single leaf area, specific leaf area, and total biomass significantly, and increased the dead root dry mass markedly. Digging depth and radian had obvious effects on the growth of A. marina seedlings, but digging frequency had minor effects. When the digging depth was <5 cm, digging radian was <240°, and digging frequency was < 2 times per month, the damage to the seedlings was slighter; but when the digging depth was > 5 cm, the damage was quite serious. Source

Jiang Y.,Central South University of forestry and Technology | Jiang Y.,Guangxi Academy of Forestry | Li Z.H.,Central South University of forestry and Technology | Zhu J.Y.,Guangxi Academy of Forestry | And 4 more authors.
Genetics and Molecular Research

Castanopsis hystrix is one of the most important and dominant species in evergreen broad-leaved forests in subtropical China. However, the population of this species undergone severe decline because of deforestation over the past 2 decades. For both conservation and forestry management, it is essential to develop molecular markers for C. hystrix. We identified 11 microsatellite loci in 2 wild populations. The number of alleles ranged from 3-11, with an average of 6.45 alleles per locus. The observed and expected heterozygosities ranged from 0.640-0.960 and from 0.676-0.910, respectively. ©FUNPEC-RP. Source

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