Fine root traits in Chamaecyparis obtusa forest soils with different acid buffering capacities
Fine root traits in Chamaecyparis obtusa forest soils with different acid buffering capacities
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DOI：
10.1007/s00468-015-1291-3
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发表时间：
2016-04
期刊：
影响因子：
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通讯作者：
Kouhei Miyatani;Y. Mizusawa;Kazuki Okada;T. Tanikawa;N. Makita;Y. Hirano
中科院分区：
文献类型：
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作者：
Kouhei Miyatani;Y. Mizusawa;Kazuki Okada;T. Tanikawa;N. Makita;Y. Hirano
关键信息的生物量，形态，和呼吸的细根的Chamaanoparis obtusa之间没有改变不同的土壤酸缓冲能力。土壤硝态氮对土壤形态和呼吸作用有显著的影响。摘要土壤酸缓冲能力（ABC）低，会加速土壤酸化，这是因为在这种条件下，盐基阳离子（BC）浓度较低，而铝（Al）浓度较高。需要更多关于土壤ABC梯度中细根性状的信息，以评估成熟森林，特别是东亚土壤加速酸化的影响。我们调查了生物量，形态（比根长; SRL），和细根呼吸速率和分析土壤氮素状况在七个Chamaaparis obtusasts与两个高度对比的ABC土壤。高、低ABC林分细根生物量、SRL和呼吸速率无显著差异。低ABC林分细根集中在土壤表层，直径<0.5mm的根生物量比例高于高ABC林分。细根生物量随土壤Al、NH 4 +-N和C的增加而增加，随土壤BC和容重的降低而增加。土壤硝态氮与细根呼吸速率和呼吸速率呈显著正相关。因此，细根性状不仅受土壤ABC的影响，还受林地土壤其他性状的影响。
Key messageThe biomass, morphology, and respiration of the fine roots ofChamaecyparis obtusadid not change between different soil acid buffering capacities. Soil nitrate has noticeable effects on morphology and respiration.AbstractLow soil acid buffering capacity (ABC) accelerates soil acidification because of the lower concentrations of base cations (BC) and higher concentrations of aluminum (Al) present under such conditions. More information on fine root traits across soil ABC gradients is required to evaluate the effects of accelerated soil acidification in mature forests, especially in East Asia. We investigated the biomass, morphology (specific root length; SRL), and respiration rates of fine roots and analyzed the soil nitrogen status in sevenChamaecyparis obtusastands with two highly contrasting ABC soils. There were no significant differences in the biomass, SRL, and respiration rates of fine roots between high- and low-ABC stands. However, fine roots in the low-ABC stands were concentrated in the uppermost soil layers and the biomass proportion of roots <0.5 mm in diameter was higher in low-ABC stands than in high-ABC stands. The fine root biomass increased with increasing soil Al, NH4+-N, and C and with decreasing soil BC and bulk density. The SRL and respiration rates of fine roots were positively correlated with soil NO3−-N. We conclude that the fine root traits were affected not only by soil ABC but also by other soil properties in the forest.