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《Acta Botanica Sinica》 2001-09
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Study on the Adaptation of Certain Species to Light Condition Under the Deciduous Broad-leaved Forests in Southern Germany——Taking the Forest Communities in Kraichtal, Germany as an Example

JIANG Yuan 1, Manfred MEURER 2(1. Institute of Resources Science, Beijing Normal University; Key Laboratory of Environmental Change and Natural Disaster, Ministry of Education, Beijing 100875, China; 2. Institute of Geography and Geoecology, Univers  
This study was conducted at the Kraichtal, southern Germany. Through the measurements of the relative illuminance under canopy and the coverage of many undergrowing species in 13 plots of forest communities, the correlation between the relative illuminance and the coverage of the species was calculated. The adaptation of 12 undergrowing species to light condition was determined based on the above calculation. Combining the indicator values of the species to ecological factors like light, humidity, temperature, acidity and nitrogen content in the soil with the constancy values of species in communities, the ranking order of undergrowing species in the communities was also examined. The results show: 1) In determining the light distribution in a forest community, scattered light condition is preferable because the interference from the drifting of light spots under the tree canopy can be reduced, and thus relatively stable distribution of light radiation can be obtained. 2) The distribution of 9 species, out of 12 species studied, was linearly correlated with the light condition under the canopy. For 7 of the 9 species, the correlation between the coverage of species and the relative illuminance was positive, and negative for 2 of them. For the other 3 species under the canopy the coverage was not correlated with the relative illuminance. 3) Compared with the light indicator values of species, the quantitative analysis of the relationships between species coverage and relative illuminance is more effective to reflect the adaptation of the species to light conditions under canopy and to reveal the ecological range of illuminance level of the species. 4) The relative adaptability of different species to light conditions directly affects the inter-specific relationships of the undergrowing species and may determine their ranking order in a community. The species with euphotic ecological range of illuminance level were easier to adapt to different light conditions under tree canopy and thus were able to exist in most forest community types with high constancy values.
【Fund】: 国家自然科学基金项目 ( 4 0 0 710 0 2 );; 高等学校骨干教师资助计划;; 德意志学术交流中心 (DAAD)资助~~
【CateGory Index】: Q948.112.1
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