Buried charcoal layer and ectomycorrhizae cooperatively promote the growth of Larix gmelinii seedlings
Buried charcoal layer and ectomycorrhizae cooperatively promote the growth of Larix gmelinii seedlings
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DOI：
10.1007/s11104-009-0040-z
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发表时间：
2010-02
期刊：
影响因子：
4.9
通讯作者：
Kobayashi Makoto;Yutaka Tamai;Yong Suk Kim;Takayoshi Koike
中科院分区：
文献类型：
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作者：
Kobayashi Makoto;Yutaka Tamai;Yong Suk Kim;Takayoshi Koike
随着时间的推移，土壤表面火灾产生的木炭会混合到土壤中，并在火灾后森林的土壤剖面内不均匀地分布。为了确定木炭垂直分布和外生菌根形成的不同模式如何影响火灾后森林中落叶松（Gmelin larch）的生长，我们在盆中进行了模型实验。在这项研究中，土壤剖面中间有一层木炭的盆比没有木炭或散布在整个土壤中的木炭的盆更能促进幼苗根系的生长。随着根系的发育，地上生物量和总生物量也随之增加。此外，除了土壤中的木炭具有积极作用外，外生菌根根的形成对幼苗的生长也有很强的积极作用。结果发现，在具有外生菌根的层状木炭中生长的幼苗的地上生物量和总生物量最大。此外，还发现在具有外生菌根的层状木炭中生长的幼苗的针叶中磷浓度最高。这是由于根部与土壤中层的木炭频繁接触以及外生菌根对磷酸盐的利用。这表明火灾后林地中成片出现的埋藏和分层木炭可能为格梅林落叶松幼苗的生长提供了合适的栖息地。
Charcoal produced by fire on the soil surface mixes into the soil over time and is heterogeneously distributed within the soil profile in post-fire forests. To determine how different patterns of vertical distribution of charcoal and ectomycorrhizal formation affect the growth ofLarix gmelinii(Gmelin larch) in post-fire forests, we conducted a model experiment in the pots. In this study, pots with a layer of charcoal in the middle of the soil profile promoted growth of the root system of the seedlings significantly more than did pots with no charcoal or with charcoal scattered throughout the soil. Along with the development of the root system, above-ground biomass and total biomass were also increased. Furthermore, in addition to the positive effects of charcoal in the soil, there were also strong positive effects on the growth of seedlings from ectomycorrhizal root formation. As a result, the largest above-ground biomass and total biomass were found for seedlings grown in layered charcoal with ectomycorrhizae. Furthermore, the highest phosphorus concentration in needles was also found for seedlings grown in layered charcoal with ectomycorrhizae. This is attributable to the frequent contact of roots with charcoal in the middle layer of the soil and the utilisation of phosphate by ectomycorrhizae. This suggests that buried and layered charcoal occurring in patches in post-fire stands may provide a suitable habitat for the growth of Gmelin larch seedlings.