Nitrogen Relations in a Douglas-fir Plantation
Nitrogen Relations in a Douglas-fir Plantation
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花旗松种植园中的氮关系
DOI：
10.1093/oxfordjournals.aob.a085239
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发表时间：
1976
期刊：
影响因子：
--
通讯作者：
P. R. Olson
中科院分区：
文献类型：
--
作者：
J. Turner;P. R. Olson
42年生西部华盛顿花旗松[Pseudotsuga menziessii（Mirb.）Franco]人工林是一种氮素缺乏的植物，在林下施用尿素和碳水化合物，以扩大C/N比，从而加剧现有的氮素缺乏。1年后，测量针叶尺寸，并分析针叶的色素含量N、P、K、Ca、Mg和Mn。施氮的结果是针叶的大小和重量增加。针保留（年）增加了N处理和减少碳水化合物处理。这种效应反映在凋落叶量上。氮浓度增加的处理，其中N被施加的色素含量，但其他营养物质的浓度可能会下降，作为生长稀释的结果。虽然没有显着减少针N浓度的碳水化合物的应用，N的吸收减少，因为针的大小和停留时间的变化。结果进行了讨论，营养诊断工作。
A 42-year-old Western Washington Douglas-fir [Pseudotsuga menziessii (Mirb.) Franco] plantation which was N-deficient was studied in relation to the application of N applied as urea to the forest floor, and carbohydrate applied to the forest floor to widen the C/N ratio and thus intensify the existing N deficiency. After 1 year, needle size was measured and needles were also analyzed for pigment content N, P, K, Ca, Mg, and Mn. As a result of N fertilization needle size and weight had increased. Needle retention (years) was increased in the N treatments and reduced in the carbohydrates treatments. This effect was reflected in the quantities of leaf litter-fall. Nitrogen concentrations were increased in treatments where N was applied as were pigment contents but other nutrients decreased in concentration probably as a result of growth dilution. While there was no significant decrease in needle N concentration where carbohydrate was applied, the N uptake was reduced because of needle size and retention time changes. The results are discussed in relation to nutrient diagnostic work.