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The utilization and distribution of the sunshine radiant energy of Carex lasiocarpa wetland in Sanjiang Plain

He Chiquan Li Lei Gu Chao Lu Xiaoyi
(Department of Environmental Science and Engineering, Shanghai  University;Shanghai,200072)

Abstract: Carex lasiocarpa is a rhizomatous clonal species of mire wetlands in Northeastern of China. The fieldwork about physical process of Carex lasiocarpa wetlands was carried out in the Shangjiang Plain Mire Wetlands Ecological Experiment Station in Chinese Academy of Science in Northeastern of China (4731`N, 13331`E). The field work was carried out in a typical Carex lasiocarpa wetlands, which areas is 200450m2 and it can divided into three areola, namely the determined areola of biomass; the determined areola of wither biomass and its decompose areola, and then it was setup each other which was used to sampling and observation from May to October in 1998-1999the frequency was about 30d, the sampling area was 11 m2 with 2~3 times. The plants were divided into different compartments, in which is leaf, sheath, rhizome, inflorescence, spike, radicula and dead standing sampling, and dried to constand weight at 80C, after which they were ground and samples were taken for analysis. The plant caloric value is determined by Parr type Oxygen bomb heat meter which is made in America. The photosynthesis is determined by photosynthesis meter, which is made in CID company in America; is analys Plant photosynthesis is the original force to impel and to support the whole ecosystem, we found that the net photosynthesis rate of Carex lasiocarpa is biggest than others in Carex lasiocarpa wetland, which is 47.41molm-2s-1. In the basis of the overall sunshine radiation and the photosynthesis availability radiation to count the energy utilization rate of each organs/component, the maximum is radicula, which are 1.3945% and 3.1879%, the minimal value is spike, which are 0.0020% and 0.0046%the energy utilization efficiency of Carex lasiocarpa population is 2.54%. The average value of underground organs/components energy content of Carex lasiocarpa community is biggest than its in others community, which showed that C. lasiocarpa had higher energy productive efficiency and most energy was stored in their under-ground part, the reason for these were also discussed. In the allocation of energy content in different underground layer, with the increase of soil depth, energy content in different underground layer is decrease by degrees.
Keywords: Carex lasiocarpa, wetland ecosystem, photosynthesis, primary production efficiency, energy content

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