Fine root biomass in relation to site and stand characteristics in Norway spruce and Scots pine stands
Fine root biomass in relation to site and stand characteristics in Norway spruce and Scots pine stands
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DOI：
10.1093/treephys/27.10.1493
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发表时间：
2007-10-01
期刊：
影响因子：
4
通讯作者：
Kukkola, Mikko
中科院分区：
文献类型：
--
作者：
Helmisaari, Helja-Sisko;Derome, John;Kukkola, Mikko
细根生物量的树木和林下植物在芬兰各地的16个立场的变化进行了研究和网站和立场的特点确定的关系。挪威云杉细根生物量在184和370 g m（-2）之间，苏格兰松在149和386 g m（-2）之间。在芬兰北方，林下根和根茎（直径< 2 mm）占林分总细根生物量的50%。因此，细根生物量的树木加林下植物在芬兰北方的两个树种的立场，导致细根生物量和温度总和之间的负相关关系和细根生物量和土壤有机层的碳：氮比之间的正相关关系。叶：细根比挪威云杉在2.1和6.4之间变化，苏格兰松在0.8和2.2之间。挪威云杉和苏格兰松的比例下降，从南到北，以及从肥沃到更贫瘠的网站类型。挪威云杉的叶细根比与断面积和茎表面积有关。这三个参数与细根氮浓度的强正相关表明，当养分有效性低时，需要更多的细根来维持一定数量的叶片。林分参数和细根生物量之间没有显着的关系，发现在林分水平，但关系大大改善时，细根生物量和林分参数计算的平均树在stand. When的北方和南方网站分别进行了分析，细根生物量每棵树的两个物种是显着相关的断面积和茎表面积每棵树。可以准确、轻松地估计断面积、茎表面积和林分密度。因此，我们的研究结果可能有价值的预测细根生物量在树和立场的水平在北方挪威云杉和苏格兰松林。
Variations in fine root biomass of trees and understory in 16 stands throughout Finland were examined and relationships to site and stand characteristics determined. Norway spruce fine root biomass varied between 184 and 370 g m(-2), and that of Scots pine ranged between 149 and 386 g m(-2). In northern Finland, understory roots and rhizomes (< 2 mm diameter) accounted for up to 50% of the stand total fine root biomass. Therefore, the fine root biomass of trees plus understory was larger in northern Finland in stands of both tree species, resulting in a negative relationship between fine root biomass and the temperature sum and a positive relationship between fine root biomass and the carbon:nitrogen ratio of the soil organic layer. The foliage:fine root ratio varied between 2.1 and 6.4 for Norway spruce and between 0.8 and 2.2 for Scots pine. The ratio decreased for both Norway spruce and Scots pine from south to north, as well as from fertile to more infertile site types. The foliage:fine root ratio of Norway spruce was related to basal area and stem surface area. The strong positive correlations of these three parameters with fine root nitrogen concentration implies that more fine roots are needed to maintain a certain amount of foliage when nutrient availability is low. No significant relationships were found between stand parameters and fine root biomass at the stand level, but the relationships considerably improved when both fine root biomass and stand parameters were calculated for the mean tree in the stand. When the northern and southern sites were analyzed separately, fine root biomass per tree of both species was significantly correlated with basal area and stem surface area per tree. Basal area, stem surface area and stand density can be estimated accurately and easily. Thus, our results may have value in predicting fine root biomass at the tree and stand level in boreal Norway spruce and Scots pine forests.