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Litterfall nutrient return in thinned young stands with Douglas fir

机译：凋落物养分回归在稀薄的年轻人用Douglas FIR站立

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The use of Douglas fir (DF) is on the increase in the Czech Republic. This tree species shows a good production and also a beneficial impact on soil to some extent. We studied both amount and properties of litterfall in 18 to 20-year-old stands with DF in 2011. Two experimental plots were DF-dominated and one showed ca. 20 a?? 30% share of Scots pine (SP) at the beginning of observation. The experiments consisted of two treatments such as unthinned control and 50 a?? 62% treesa?? density reduction accounting for 43 a?? 59% basal area reduction. Litterfall was collected using litter traps of 0.25 m2 area in 3 a?? 4 traps per treatment. Forest floor L and F were taken in 2011 and 2018 to investigate the development of their amount after thinning. Both whole-period sum and mean annual litterfall were reduced after thinning compared to controls. The mean annual litterfall totaled ca. 3 t haa??1 in 20-year-old DFa??dominated stands. This amount represents an annual nutrient return of 30 a?? 40 kg N, 1 a?? 3 kg P, 3 a?? 5 kg K, 12 a?? 30 kg Ca and 1 a?? 2 kg Mg per one hectare. The reduction of the annual litterfall was more pronounced in DFa??dominated stands. All thinned plots showed increased decomposition rates reflected in lower total L+F amounts in both DFa??dominated plots whereas unthinned plots accumulated more L+F at the end. The mixed DFa??SP plot showed reduced L and increased F layer amounts in both unthinned and thinned treatments with only minor change to L+F sum between 2011 and 2018.
机译：Douglas FIR（DF）的使用是捷克共和国的增加。这棵树物种显示出良好的生产，也是对土壤的有益影响。我们在2011年使用DF的18至20岁的垃圾量和特性研究了垃圾层。两次实验块是DF主导的，一个展示了CA. 20 a ??在观察开始时，30％的苏格兰松树（SP）份额。实验由两种治疗组成，例如未确定的对照和50 a ?? 62％的树木？密度减少占43个？减少59％基础区域。使用0.25平方米区域的垃圾陷阱收集落梗塞。每次治疗4陷阱。 2011年和2018年森林地板L和F是在减少后调查其数量的发展。与对照相比，稀疏后，全周期总和和平均年落叶减少。平均年落降落总计加利福尼亚州。在20岁的DFA中，3 T Haa？占主导地位。这一数量代表了30 a ??的年营养返回40 kg n，1 a ?? 3 kg p，3 a ?? 5 kg k，12 a ?? 30 kg ca和1 a ??每公顷2千克Mg。在DFA主导地位中，年度落水的减少更加明显。所有稀释的图表明，在DFA的主导地块中，较低总量L + F量的分解率增加的分解率增加，而未定数的图在末端累积了更多L + F.混合的DFA ?? SP图显示出L1的减少，并且在未染色和稀释的处理中增加的F层量，仅在2011年和2018年之间进行了微小的变化。

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