Nutrient dynamics of the southern and northern BOREAS boreal forests
Nutrient dynamics of the southern and northern BOREAS boreal forests
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BOREAS 北方森林南部和北部的养分动态
DOI：
10.1080/11956860.2000.11682620
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
C. Kucharik
中科院分区：
文献类型：
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作者：
S. Gower;A. Hunter;J. Campbell;J. Vogel;H. Veldhuis;J. Harden;S. Trumbore;J. Norman;C. Kucharik
摘要本研究的目的是比较养分浓度，分布，并选择成分的养分收支白杨（杨树tremuloides），短叶松（松banksiana），黑云杉（云杉mariana）森林生态系统在北方生态系统大气研究（BOREAS），南部和北方研究地区附近的蜡烛湖，萨斯喀彻温省和汤普森，马尼托巴，加拿大，分别。白杨、黑云杉和短叶松林的植被（不包括细根和林下植被）分别占生态系统总碳含量的70- 79%、53- 54%和58-67%。土壤（林地和矿质土壤）氮（N）、钙（Ca）和镁（Mg）含量占整个生态系统养分含量的90%以上，但南方黑云杉林和南方白杨林Ca、Mg含量低于90%。对于颤白杨（30-41 kg N ha-1 yr-1），年凋落物氮含量显著（p < 0.05）大于短叶松（5-10 kg N ha-1 yr-1）或黑云杉（6-7 kg N ha-1 yr-1），南部研究区的年凋落物氮含量通常大于北方研究区，但不显著。林地净初级生产力呈正相关（R2 = 0.91），每年凋落物N含量的BOREAS森林，和所有北方森林（R2 = 0.57）。年地上养分（N，Ca，Mg和K）的需求量（叶，枝，茎养分年增长量的总和）显着大于（p < 0.05）颤抖白杨比杰克松或黑云杉林。每年的地上氮需求量为37-53，6-14，和6-7公斤氮公顷-1年-1颤抖白杨，短叶松，黑云杉林，分别。落叶针叶林比万年青针叶林对养分的需求量更大，这是由于其生物量的年生产量更大，养分的利用效率更低。北方森林的养分循环特征受气候和森林类型的影响，后者对凋落物N、年养分需求量、养分平均停留时间和养分分布有较大影响。
Abstract The objective of this study was to compare nutrient concentration, distribution, and select components of nutrient budgets for aspen (Populus tremuloides), jack pine (Pinus banksiana), and black spruce (Picea mariana) forest ecosystems at the BOReal Ecosystem Atmosphere Study (BOREAS), southern and northern study areas near Candle Lake, Saskatchewan and Thompson, Manitoba, Canada, respectively. The vegetation (excluding fine roots and understory) in the aspen, black spruce, and jack pine stands contained 70-79%, 53-54%, and 58-67% of total ecosystem carbon content, respectively. Soil (forest floor and mineral soil) nitrogen (N), calcium (Ca), and magnesium (Mg) content comprised over 90% of the total ecosystem nutrient content, except for Ca and Mg content of the southern black spruce stand and Ca content of the southern aspen stand which were less than 90%. Annual litterfall N content was significantly greater (p < 0.05) for trembling aspen (30-41 kg N ha-1 yr-1) than for jack pine (5-10 kg N ha-1 yr-1) or black spruce (6-7 kg N ha-1 yr-1), and was generally greater, but not significantly, for the southern than for the northern study area. Aboveground net primary production was positively correlated (R2 = 0.91) to annual litterfall N content for the BOREAS forests, and for all boreal forests (R2 = 0.57). Annual aboveground nutrient (N, Ca, Mg, and K) requirements (sum of the annual increment of nutrient in foliage, branches, and stems) were significantly greater (p < 0.05) for trembling aspen than for jack pine or black spruce forests. Annual aboveground N requirements ranged from 37-53, 6-14, and 6-7 kg N ha-1 yr-1 for trembling aspen, jack pine, and black spruce forests, respectively. The greater nutrient requirements of deciduous than evergreen boreal forests was explained by a greater annual production of biomass and lower use efficiency of nutrients. Nutrient cycling characteristics of boreal forests were influenced by climate and forest type, with the latter having a greater influence on litterfall N, annual nutrient requirements, nutrient mean residence time, and nutrient distribution.