Variation in leaf area index and stand leaf mass of European beech across gradients of soil acidity and precipitation
Variation in leaf area index and stand leaf mass of European beech across gradients of soil acidity and precipitation
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DOI：
10.1007/s11258-006-9127-2
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发表时间：
2006-10-01
期刊：
影响因子：
1.7
通讯作者：
Clases, York
中科院分区：
文献类型：
--
作者：
Leuschner, Christoph;Voss, Sylvia;Clases, York
叶面积指数（LAI，单位地面面积的单侧叶面积）是植物生产力的关键决定因素，对植被与大气之间的水和能量交换有很大影响。森林 LAI 随景观和环境梯度的变化及其原因尚未得到充分了解。我们通过在 23 个封闭的成熟林中收集枯枝落叶来测量欧洲山毛榉 (Fagus sylvatica) 的 LAI，这些林分具有不同的降雨量和土壤酸度或肥力梯度。山毛榉林的平均 LAI 为 7.4 m(2) m(-2)（最小值：5.6，最大值：9.5 m(2) m(-2)），保持了相对较高的叶面积指数，并且沿陡峭的环境梯度变化相对较小。与预期相反，减少可用水量（降雨梯度从 1030 至 520 mm yr(-1)）或增加土壤酸度（pH 3-7）对 LAI 没有显着影响。林分叶质量（M-l）随土壤肥力（C/N 比、基础饱和度）略有增加。我们根据 LAI 和 M-l 对场地可用水量（降雨量）、土壤肥力或酸度（pH、碱饱和度、碳氮比、交换性镁和铝含量）以及林分结构（林分年龄和茎密度）等参数进行回归，以检测林分叶面积的环境控制。站立年龄是对 LAI 和 M-l 影响最大的因素（负相关）。茎密度和土壤基饱和度对M-l影响显着，但对LAI影响较弱。我们的结论是，山毛榉的叶面积指数主要受年龄相关的生理因素的控制，而土壤化学和降雨的影响相对较小。
Leaf area index (LAI, the one-sided foliage area per unit ground surface area) is a key determinant of plant productivity which has a large influence on water and energy exchange between vegetation and the atmosphere. The variation in forest LAI across landscapes and environmental gradients and its causes are not sufficiently understood. We measured the LAI of European beech (Fagus sylvatica) by litter trapping in 23 closed, mature stands across gradients of rainfall and soil acidity or fertility. With a mean LAI of 7.4 m(2) m(-2) (minimum: 5.6, maximum: 9.5 m(2) m(-2)), beech stands maintained a comparably high leaf area index with relatively small variation along steep environmental gradients. Contrary to expectation, decreasing water availability (rainfall gradient from 1030 to 520 mm yr(-1)) or increasing soil acidity (pH 3-7) had no significant effect on LAI. Stand leaf mass (M-l) increased slightly with soil fertility (C/N ratio, base saturation). We regressed parameters of site water availability (rainfall), soil fertility or acidity (pH, base saturation, C/N ratio, exchangeable Mg and Al content), and stand structure (stand age and stem density) against LAI and M-l in order to detect environmental controls of stand leaf area. Stand age was the most influential factor for both LAI and M-l (negative relationship). Stem density and the base saturation of the soil affected M-l significantly, but had a weak influence on LAI. We conclude that the leaf area index of beech is mainly under control of age-related physiological factors, whereas the influence of soil chemistry and rainfall is comparably low.