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三江平原毛果苔草濕地光輻射能的利用與分配

注意:本論文已在《水生生物學報》2003,27(5):502-506上發表
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何池全 李 蕾 顧 超 陸曉怡
(上海大學環境科學與工程系, 上海, 200072)

摘要:毛果苔草濕地的物理過程觀測設在中國科學院三江平原沼澤濕地生態實驗站內,用美國CID公司出品的光合儀對典型濕地中幾種優勢植物的光合能力進行測定;在80。C干燥的植物樣品(含各種不同的構件),粉碎后,分別稱量約1g左右,用美國公司Parr型氧彈式熱量計測定;研究發現毛果苔草濕地建群種中毛果苔草的凈光合速率最大, 為47.41μmol·m-2·s-1。以太陽總輻射能和生長季內光合有效輻射為基礎計算出各器官的能量利用效率計, 極大值是細根, 分別為1.3945%和3.1879%, 極小值是穗, 分別為0.0020%和0.0046%,毛果苔草種群的能量利用率為2.54%。濕地不同植物群落地下部分的能量含量分布中毛果苔草群落的地下部分能量含量的平均值最大。這說明毛果苔草種群具有較高的能量轉化效率,并將大部分能量儲存在地下部分。在不同層次的能量含量分配中,隨著土壤深度的增加,地下部分的能量含量是趨于遞減趨勢的。
關鍵詞:毛果苔草;濕地生態系統;光合作用;初級生產效率;地下器官能量含量

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 200×450m2 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 1×1 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 47.41μmol·m-2·s-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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