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首页> 外文期刊>Geoderma: An International Journal of Soil Science >Leaching of cations and sulphate after mechanical site preparation at a boreal forest clear-cut area
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Leaching of cations and sulphate after mechanical site preparation at a boreal forest clear-cut area

机译：在北部森林砍伐区进行机械场地准备后，阳离子和硫酸盐的浸出

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It is generally assumed that site preparation after forest harvesting has an impact on nutrient leaching to watercourses, but the scientific evidence is limited. We studied the effects of soil harrowing on cation (Ca2+, Me2+, K+, H+, Al3+, Fe3+) and sulphate (SO42-) fluxes through podzolic soil horizons in a boreal forest in Finland. The Norway spruce (Picea abies (L) H. Karst) dominated forest had been stem-only harvested in 1996 and soil harrowing with a disc-plower carried out in 1998. Three different micro-sites were formed: shallow furrows (25% of whole area), low ridges (30%) and undisturbed surface (45%). Zero-tension lysimeters were installed below the organic (O), eluvial (E) and illuvial (B) horizons at each of these micro-sites and leachates collected from 1999 to 2003. The leaching of cations and SO42- Was the highest under the ridges and lowest under the furrows, and mainly the result of increased concentrations, indicating that organic matter as a source and mechanism was involved in cation and SO42- leaching. Leaching fluxes (kg ha(-1)) from below the B-horizon for entire treated area over the five-year study period were 6.26 kg ha(-1) for Ca2+, 11.40 kg ha(-1) for K+, 1.97 kg ha(-1) for Me2+, 1.00 kg ha(-1) for Al3+, 0.06 kg ha(-1) for H+, 0.30 kg ha(-1) for Fe3+ and 7.48 kg ha(-1) for SO42- -S. Deposition inputs for the same period were 6.51 kg ha(-1) for Ca2+, 7.02 kg ha(-1) for K+, 1.24 kg ha(-1) for Mg2+, 0.96 kg ha-1 for Al3+, 0.83 kg ha(-1) for Fe3+ and 12.65 kg ha(-1) for SO42- -S. Assuming the fluxes from the undisturbed micro-site represent those from an unprepared clear-cut area, Fe3+ leaching increased by 112% and those of Al3+, H+, Ca2+, Me2+ and K+ were 47%, 27%, 21%, 21% and 12%, respectively. The leaching of SO42- -S was not affected by site preparation. Since nitrate leaching was negligible, the increased leaching of cations can be attributed to the increased concentrations of dissolved organic carbon and charge-countering organic anions. The results show that soil harrowing increases cation (including important mineral nutrients, Ca, Mg and K) leaching losses from the soil; more so than clear cutting, and in relation to the extent and intensity of soil disturbance. (C) 2009 Elsevier B.V. All rights reserved.
机译：通常认为，森林采伐后的场地整备会影响养分向河道的淋溶，但科学证据有限。我们研究了土壤arrow割对通过芬兰北方森林中豆荚状土壤层的阳离子（Ca2 +，Me2 +，K +，H +，Al3 +，Fe3 +）和硫酸盐（SO42-）通量的影响。挪威云杉（Picea abies（L）H. Karst）为主的森林，仅在1996年采伐，1998年进行了圆盘耕作，使土壤耙松。形成了三个不同的微地点：浅犁沟（占25％整个区域），低脊（30％）和不受干扰的表面（45％）。在1999年至2003年收集的每个微场所和渗滤液中，在有机层（O），淋溶层（E）和逆流层（B）层的下方均安装了零张力测渗仪。垄沟最低，主要是浓度增加的结果，表明有机物作为来源和机理参与了阳离子和SO42-的浸出。在五年研究期内，整个处理区域从B水平线以下的渗漏通量（kg ha（-1））对于Ca2 +为6.26 kg ha（-1），对于K +为11.40 kg ha（-1），1.97 kg对于Me2 +为ha（-1），对于Al3 +为1.00 kg ha（-1），对于H +为0.06 kg ha（-1），对于Fe3 +为0.30 kg ha（-1）和对于SO42- -S为7.48 kg ha（-1） 。同期的沉积输入为Ca2 +为6.51 kg ha（-1），K +为7.02 kg ha（-1），Mg2 +为1.24 kg ha（-1），Al3 +为0.96 kg ha-1、0.83 kg ha（- 1）对于Fe3 +，对于SO42- -S为12.65 kg ha（-1）。假设来自未扰动微场所的通量代表未准备好的明确区域的通量，Fe3 +的浸出量增加了112％，Al3 +，H +，Ca2 +，Me2 +和K +的通量分别为47％，27％，21％，21％和分别为12％。 SO42--S的浸出不受场地准备的影响。由于硝酸盐的淋溶可以忽略不计，所以阳离子淋溶的增加可以归因于溶解有机碳和反电荷有机阴离子浓度的增加。结果表明，耙土增加了土壤中阳离子（包括重要的矿质养分，钙，镁和钾）的淋溶损失。与明确的砍伐有关，而且与土壤扰动的程度和强度有关。 （C）2009 Elsevier B.V.保留所有权利。

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