Studies on the Classification of the Forest Site Unit in Ibaraki Prefecture (II)

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  • 茨城県の森林立地区分 (II)
  • 茨城県の森林立地区分-2-林齢,地位,立地区によるスギ針葉の養分濃度の変動について
  • イバラキケン ノ シンリン リッチ クブン 2 リンレイ , チイ , リッチク ニ ヨル スギシン ヨウ ノ ヨウブン ノウド ノ ヘンドウ ニ ツイテ
  • 林齢,地位,立地区によるスギ針葉の養分濃度の変動について
  • Variation of the nutrient content in Sugi (<i>Cryptomeria japonica</i>) needles according to tree age, site quality and forest site unit

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For the purpose of investigating the local characteristics of the nutrient status in the Sugi forest in Ibaraki prefecture, the authors have carried out chemical analysis of the soil and needles of established Sugi stands in three forest site units classified by enviromental factors such as climate, geological formation and topography.<br> In this paper, the authors dealt with the variation in nutrient contents in the current year needles of Sugi according to tree age, site quality and forest site unit.<br> 1. The established Sugi stands varing in tree age from 19 to 62 were picked up from various site index classes in three forest site units.<br> 2. The analytical data of the needles were calculated statistically by the method of variance analysis at two-way layout (tree age classes and site index classes). The method is as follows: The variances based on the tree classes and site index classes are compared with the variance of the forest site unit.<br> 3. The results of the variance analysis are as follows: It was not found statistically any significant difference in the nutrient contents according to the tree age classes on N, P, K, Ca and Mg, except for the N content of the needles in Kahoku forest site unit where N content of the soils was very low. For this reason, the variance of the nutrient among the forest site units were relatively larger than that of the tree age classes. On the other hand, there was found difference in the nutrient content in N, P and K significantly among the site index classes.<br> 4. Nutrient examination was carried out in young stands before crown closure. The needles of young stands retained a higher content of N, K and Mg, and a lower content of Ca than those of the established stands.<br> 5. From the above results, in case of the established stands, it appeared that the differences in the nutrient contents of the sample tree leaves, with the exception of those unstable ones immediately after the closure of stand, were generally not so great among different tree ages as among different forest site units.

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