Warianty tytułu
Języki publikacji
Abstrakty
Natural regeneration of forest depends on the light regimes of floor. Point-based methods such as fisheye photo and radiometer can not provide a full panorama of light regime of heterogeneous forest stand. Eastern Tibetan Plateau is a major forest belt characteristic of diverse forest type and topographic differentiation. Understanding the trend of changes of light regime along succession series of forest may be helpful for the management of ecosystems. Fragmented forest patches due to tectonic activity and human intervention have made this prediction difficult. We use a spatially explicit forest stand light model (tRAYci) to simulate light distribution within forest in typical subalpine forest succession series of eastern Tibetan Plateau. Due to the spatial heterogeneity of tree distribution in the subalpine area, the forest stand can be approximated with a spatially explicit model of trees. Three typical subalpine forest stands (Sabina forest (SF), Fir forest (FF) and Birch forest (BF)) are selected in the eastern Tibetan Plateau. The dominant species are sabina (Sabina saltuaria (Rehd. et Wils.) Cheng), fir (Abies faxoniana Rehd. et Wils.) and birch (Betula platyphylla Suk.) for each stand and they are spatially clumped in distribution. They represent old growth coniferous forest (SF, 330 years old), coniferous-broadleaved forest (FF, 180 ys) and pioneer broadleaved forest (BF, 40 ys). The parameters of the three-dimensional model of trees are calibrated with field measurements. The simulated values are generally consistent with observed values of radiation measured by radiometers installed in these stands and values derived from fisheye photos. Test failures may be caused by the incomplete submodel of crown as a gap free one. Light regimes in old growth and pioneer forest are much more heterogeneous than intermediate stages of forest. Light regimes of these forests are also reflected by the composition of understory herb layers.
Czasopismo
Rocznik
Tom
Strony
251-260
Opis fizyczny
Bibliogr. 32 poz.,Rys., tab., wz.,
Twórcy
autor
autor
autor
- Chengdu Institute of Biology, Chinese Academy of Sciences, No. 9 Section 4th of South Renmin Road, Chengdu 610041, China, wuning@cib.ac.cn
Bibliografia
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- 10. da Silva D., Balandier P., Boudon F., Marquier A., Pradal C., Godin C., Sinoquet H. 2007 – Modeling of light transmission under heterogeneous forest canopy : model description and validation (In: 5th International Workshop on Functional-Structural Plant Models) – Napier, New Zealand, pp. 58-61.
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- 30. Taylor A.H., Qin Z.S., Liu J. 1996 – Structure and dynamics of subalpine forests in the Wang Lang Nature Reserve, Sichuan, China – Plant Ecol. 124: 25-38.
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Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.baztech-article-BGPK-2581-9926