Growth Responses of Trees to Micronutrients and Their Feedback Effect in Various Soil-Forest Ecosystems of Taihu Lake Region

摘要

Vector analysis technique and ecological sequential comparison methods were adopted to study tree growth response to the micronutrients, B, Mo, Cu, Zn, Fe, and Mn, in soils derived from various parent materials in the forest area of Taihu Lake region in southeast China. The results showed that the dry weight of individual current-year needle of Chinese fir (Cunninghamia lanceolata) grown on the soil derived from granite parent rock was increased by 8% and 13% in comparison with that grown on the soils derived from sandstone and ash-tuff parent rock, respectively. And such dry weight of loblolly pine (Pinus taeda) grown on the soil derived from sandstone parent rock was increased by 21% in comparison with that on the soil derived from ash-tuff parent rock. One of the reasons for those results was that micronutrients content in the soil derived from ash-tuff parent rock were not sufficient to meet the requirement of the growth of Chinese fir and loblolly pine, i.e., micronutrients in soil were deficient and/or induced deficient. The amounts of Cu, Zn, Fe, and Mn uptake by Chinese fir and loblolly pine were in agreement with the contents of available micronutrients in soil respectively, except for B and Mo. Meanwhile, there might exist an "antagonism" between the uptake of B versus Mo by trees, although more studies are needed to confirm it. Regression analysis indicated that amount of a soil available micronutrient was correlated to the type of parent material and its total amount in the forest floor, except for B. The F test identified that the correlation of each equation reached the significant level to different extents, respectively. The t test confirmed that amount of available forms was mainly depended on the type of parent material for Mo, Cu, Zn and Mn but on the forest floor for Fe. There was a feedback effect of forest stand on the amount of soil available micronutrients. The ability of accumulating available micronutrients in soil was better by the sawtooth oak (Quercus acutissima) stand than by the Chinese fir stand (except for B). The ability of accumulating available Zn, Fe, Mn and Mo in soil was better by the Chinese fir stand than by the loblolly pine stand, while as for available B and Cu, by the latter was better than by the former. When discussing the effect of forest stand on the amount of soil available micronutrients, not only the amount of micronutrient in the forest floor and the parent materials but also the amount of micronutrient taken up by current-year needles have to be considered.

机译：采用矢量分析技术和生态顺序比较方法研究了太湖地区林区不同母质土壤中树木对微量元素B，Mo，Cu，Zn，Fe和Mn的生长响应。。结果表明，在花岗岩母岩土壤上生长的杉木（Cunninghamia lanceolata）当年针的干重比在砂岩和灰烬土壤上生长的杉木增加了8％和13％。 -凝灰岩母岩，分别。并且，在砂岩母岩来源的土壤上生长的火炬松（Pinus taeda）的干重比灰烬母岩来源的土壤干重增加了21％。这些结果的原因之一是灰分母岩中土壤中的微量元素含量不足以满足杉木和火炬松的生长需求，即土壤中的微量元素含量不足和/或诱导不足。。杉木和火炬松对铜，锌，铁和锰的吸收量分别与土壤中速效养分的含量一致（除硼和钼外）。同时，杉木和火炬松的吸收之间可能存在“拮抗作用”。 B对Mo的影响，尽管还需要更多研究来证实。回归分析表明，土壤有效微量元素的量与母材类型及其在林地中的总量有关（B除外）。F检验表明，每个方程的相关性在不同程度上分别达到显着水平。 t检验证实，可用形式的数量主要取决于Mo，Cu，Zn和Mn的母体材料类型，而取决于Fe的林地。林分对土壤有效微量营养素的数量有反馈作用。锯齿栎（Quercus acutissima）林分比杉木林（B类除外）更好地在土壤中累积有效微量营养素。杉木林分比火炬松林分更好地积累了土壤中有效锌，铁，锰和钼的能力，而对于有效硼和铜，后者要好于前者。在讨论林分对土壤有效微量营养素数量的影响时，不仅要考虑林地和母体材料中微量营养素的数量，而且还要考虑当年针叶吸收的微量营养素的数量。

Growth Responses of Trees to Micronutrients and Their Feedback Effect in Various Soil-Forest Ecosystems of Taihu Lake Region

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