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首页> 外文会议>International Peat Congress; 20040606-11; Tampere(FI) >DECOMPOSITION OF SURFACE PEAT ON MIRES DRAINED FOR FORESTRY ALONG TROPHIC AND CLIMATIC GRADIENTS
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DECOMPOSITION OF SURFACE PEAT ON MIRES DRAINED FOR FORESTRY ALONG TROPHIC AND CLIMATIC GRADIENTS

机译：营养和气候梯度上排泄的森林中表层泥炭的分解

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摘要

Nitrogen is the most important nutrient for forest trees. On drained peatlands most nitrogen is in an insoluble organic form that the trees and plants cannot utilize. Usually, the degree of decomposition of the peat is connected to the fertility, n.b. the nitrogen content of the site. We studied the relationship between the temperature sum, soil variables and rates of decomposition of the surface peat (0-10 cm) of mires drained for forestry that are located in different climatic regions. The analyses were done according to the standard outline used by the Finnish Forest Research Institute. The mires are situated in Taivalkoski, Pudasjaervi, Ilomantsi and Parkano with corresponding mean temperature sums 850,950,1040 and 1150 d.d. (threshold value 5℃). The mires form nutritional gradients with the mean peat nitrogen concentrations ranging from 0.7 to 3.0%. The main peat types were Sphagnum and Carex peats. In the peat with nitrogen concentrations higher than 1.5% the proportion of tall herb, Carex and Bryales components were dominant. In regions were the temperature sum was 1040 d.d. or more there was a positive linear correlation between the rate of decomposition and the peat nitrogen concentration of the surface peat, but this correlation was weaker or even negative in mires with temperature sums at or below 950 d.d.
机译：氮是林木最重要的养分。在排水的泥炭地上，大多数氮是树木和植物无法利用的不可溶有机形式。通常，泥炭的分解程度与肥力n.b有关。该地点的氮含量。我们研究了温度总和，土壤变量与位于不同气候区的排干森林泥潭的表层泥炭（0-10厘米）分解速率之间的关系。分析是根据芬兰森林研究所使用的标准轮廓进行的。这些泥潭位于Taivalkoski，Pudasjaervi，Ilomantsi和Parkano，相应的平均温度总和为850、950、1040和1150d.d。 （阈值5℃）。泥潭形成营养梯度，平均泥炭氮浓度为0.7％至3.0％。主要泥炭类型为泥炭藓和Carex泥炭。在氮含量高于1.5％的泥炭中，高草中比例较高的是Carex和Bryales成分。在各地区，温度之和为1040d.d。分解速率与表面泥炭的氮素浓度之间呈线性正相关，但在温度等于或低于950 d时，泥潭中的相关性较弱甚至为负。

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