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首页> 外文期刊>Ecohydrology >Rainfall partitioning along a tree diversity gradient in a deciduous old-growth forest in Central Germany
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Rainfall partitioning along a tree diversity gradient in a deciduous old-growth forest in Central Germany

机译：德国中部落叶古树森林中沿树木多样性梯度的降雨分配

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摘要

This study investigated whether rainfall partitioning into throughfall, stemflow, and interception changes along a tree species diversity gradient. The 12 study plots in old-growth forest stands in the Hainich National Park, Germany, were composed of up to 11 tree species. Fagus sylvatica (beech) formed the monospecific plots. Mixed forest plots consisted of a variable admixture of other broad-leaved deciduous species such as Tilia spec, Fraxinus excelsior, Carpinus betulus, and Acer pseudoplatanus. Rainfall partitioning was influenced by several stand characteristics. Tree species diversity expressed as Shannon index was the variable that explained throughfall for different seasons most frequently. For example, in high-rainfall summer 2007, median throughfall per stand was between 66 and 77% of gross precipitation, whereas stemflow played a minor role (2-6% per stand). Throughfall correlated positively with Shannon index (r_s = 0·74, p = 0·008), stemflow negatively (r_s = -0·87, p < 0·001), and interception showed no correlation along this beech to mixed forest gradient. These relationships were similar in summer 2005 and autumn 2006， but no or weak changes of throughfall with tree diversity were observed during other study periods. Multiple linear regressions supported the assumption that combinations of several characteristics are important. Shannon index in combination with mean dbh explained much of the variability observed in throughfall among stands in two seasons (up to R_(adj)~2 = 0·63, p < 0·01). Influential stand characteristics varied between seasons and years due to different rainfall conditions. Spatial variability of throughfall within a stand did not change consistently with any stand characteristic.
机译：这项研究调查了降雨是否沿树木物种多样性梯度划分为贯穿流，茎流和截留。在德国海尼希国家公园的老树林中的12个研究地块由多达11种树种组成。山毛榉（Fagus sylvatica）（山毛榉）形成了单特异性地块。混交林地由其他阔叶落叶树种的可变混合物组成，例如T树属，优良白蜡树，小花锦鸡儿和伪槭。降雨分区受几个林分特征的影响。以香农指数表示的树木物种多样性是最能解释不同季节贯穿降雨的变量。例如，在2007年夏季的高降雨中，每站的中位数穿通量占总降水量的66％至77％，而茎流的作用较小（每站2％至6％）。穿透力与香农指数呈正相关（r_s = 0·74，p = 0·008），茎流呈负相关（r_s = -0·87，p <0·001），截留表明该山毛榉与混交林梯度没有相关性。这些关系在2005年夏季和2006年秋季相似，但在其他研究期间未观察到穿透力随树木多样性的变化或微弱变化。多个线性回归支持以下假设：几个特征的组合很重要。 Shannon指数与平均dbh的结合解释了两个季节的林分穿透降雨所观察到的大部分变化（R_（adj）〜2 = 0·63，p <0·01）。由于降雨条件的不同，影响林分的特征在季节和年份之间也有所不同。林分内穿透的空间变异性并未随林分的任何特征而一致地变化。

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