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MIGRATION OF PALEOvegetational ZONE AND PALEOCLIMATIC CHANGES OF QUATERNARY IN THE COASTAL REGION OF SOUTH CHINA

Chinese Science Bulletin 1991年第20期36卷 1720-1724页

作者：王开发张玉兰蒋辉 Research Department of Loess and Quaternary Geology Academia Sinica Xi'an 710061 Department of Marine Geology Tongn University Shanghai 200092 PRC

Migration of vegetational zone during the Quaternary is very obvious, as it is in the north of China. However, there are only a few data about the tropical and the south subtropical zones in the coastal region of South China and few systematic researches have been done. This note deals with sporopollen assemblages of the Quaternary from

关键词： the Quaternary migration of vegetational zone paleoclimate.

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Vegetation succession and environmental changes in Central India during Early Cenozoic

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科学通报 2013年第S1期58卷 97-103页

作者： KAPGATE Dashrath Kisanji Department of Botany J M Patel College

In order to infer the climate and the floral changes during the early Cenozoic of central India, a critical analysis has been made of the generic composition of Deccan Intertrappean series of India, which is now known to a greater extent. Most of the information regarding Deccan Intertrappean flora is derived from the assemblages from Vidharbha-Chhindwara region and Mandla District in central India. The Vidharbha-Chhindwara region constituted by taxa representing all major groups of plant kingdom belonging to different habitats like(i) marine(3 genera of doubtful marine alga)(ii) estuarine(27 species of palms, Nypa and Viracorpon like Pandanaceous fruits, Sonneratia, Cocos like plants)(iii) fresh water(6 genera of fresh water algae, water ferns, Eichhornia, Nymphea like hydrophytic angiosperms)(iv) marshy(5 genera of bryophytes, water ferns, Selaginella and Equisetum like pteridophytes and many angiospermic plants showing aerenchymatous tissue and few parts infected by fungal spores) and(v) terrestrial(2 families of gymnosperms and 15 families of arborescent angiosperms). Mandla-Dindori District mainly comprise angiospermous flora. These constitute 15 species of palm woods and woods of 25 dicot families indicating terrestrial dry habitat. The fossil flora so far recovered from these beds indicate that the tropical evergreen to semi-evergreen type forests with some moist deciduous plants, similar to the present day forests of Western Ghats, and northeast India, were flourshing around Vidharbha, Chhindwara and Mandla area of Central India during Upper Cretaceous-Lower Tertiary period, in contrast to the present day dry deciduous to moist deciduous types of forest. This flora was well represented in India in the past but has become restricted to Burma and Andaman-Nicobar Islands due to change in the climatic conditions. The comparison of the temperature data from these fossiliferous localities and the comparable modern areas clearly indicates that the climate in Centra

关键词： Deccan Intertrapps vegetational reconstructions Vidharbha-Chhindwara Mandla-Dindori region(Central India) early Tertiary

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Assessing Spatial Patterns of Plant Communities at Varying Stages of Succession

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Applied Mathematics 2014年第12期5卷 1842-1851页

作者： Kevin Aagaard Gregg Hartvigsen Department of Biology SUNY Geneseo Geneseo USA Department of Ecology Evolution and Natural Resources Rutgers University New Brunswick USA

There is a well known connection between the structural complexity of vegetative stands and ecosystem properties. Developing methods to quantify this structural complexity is an important goal for ecologists. We present an efficient and easily implemented field technique for calculating the shape of forest canopies, and the shape of forest stands as succession occurs, using fractal geometry. Fractal geometry can be used to describe complex, non-Euclidean objects that are common in natural systems. We tested the use of this tool in 22 vegetative and forested plots in Western New York State, USA. We found an asymptotic relationship for fractal dimension (D) as a function of basal area (BA;r2= 0.68). In a randomization test to investigate the robustness of D to different tree canopy shapes, we found that D was sensitive to canopy shape switching, suggesting that the method is able to differentiate among similar forests comprised of species having different shaped crowns. We conclude that the shape is conserved in vegetative areas as they progress from one stage of succession to the next (range of mean D: 2.56 to 2.68 across stages). Furthermore, we conclude that the shape filling properties—i.e., distribution of trunks and limbs in a forested area, measured as mean distance—are also conserved across vegetational chronosequences (F = 1.3189, df = 8, 3, p = 0.3341).

关键词： Ecological Succession Fractal Dimension vegetational Chronosequence Crown Shape Statistical Modeling

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