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首页> 外文期刊>Plant and Soil >The impact of available water content in previous agricultural soils on tree growth and nutritional status in young hybrid aspen plantations in Estonia
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The impact of available water content in previous agricultural soils on tree growth and nutritional status in young hybrid aspen plantations in Estonia

机译：爱沙尼亚前混交白杨人工林中以前农业土壤中有效水分含量对树木生长和营养状况的影响

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摘要

The impact of soil available water content (AWC) on the growth and foliar nutrient concentrations of trees in 7-yr-old hybrid aspen (Populus tremula L. x P. tremuloides Michx.) plantations established on abandoned agricultural lands was studied. AWC in the topmost 75 cm soil layer was significantly related to height growth and foliar N concentration of hybrid aspens. The correlations were stronger on well-drained automorphic soils and in the case of a dry growing season with insufficient precipitation. AWC over 150-160 mm can be considered sufficient, and below 120 mm insufficient for fast growth of hybrid aspen. The differences in AWC were less pronounced in the top 25 cm soil layer but were more noticeable in the 25-50 and 50-75 cm soil layers. AWC estimated as a function of soil specific surface area and bulk density was shown here to be a significant indicator for site selection for establishing hybrid aspen plantations. Foliar N concentration over 2.7% can be considered optimal and below 2.4%, insufficient for hybrid aspen on the studied soils. Foliar concentrations of P (on average 0.24%) and K (on average 0.79%) varied little and, thus, did not correlate with tree growth. The most suitable previous agricultural soils for afforestation with hybrid aspen would be moderately drained Albeluvisols, Luvisols and Planosols.
机译：研究了土壤有效水分含量（AWC）对在废弃农业土地上建立的7年生杂种白杨（Populus tremula L. x P. tremuloides Michx。）人工林生长和叶片营养元素浓度的影响。最上层75厘米土壤层中的AWC与杂种白杨的高度增长和叶片氮含量显着相关。在排水良好的同质土壤上以及在降水不足的干燥生长季节的情况下，相关性较强。大于150-160 mm的AWC被认为是足够的，而小于120 mm的AWC不足以使杂交白杨快速生长。在顶部25 cm土层中，AWC的差异不太明显，但在25-50和50-75 cm土层中，AWC的差异更明显。估计的AWC是土壤比表面积和容重的函数，是建立混合白杨人工林选址的重要指标。叶面氮的浓度超过2.7％可以认为是最佳的，而低于2.4％的浓度，不足以用于研究土壤上的混合白杨。 P（平均0.24％）和K（平均0.79％）的叶面浓度变化不大，因此与树木的生长无关。以前最适合混种白杨造林的农业土壤是中等排水的沙丁胺醇，路维索和普莱诺索尔。

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