SPATIAL VARIABILITY OF THROUGHFALL FLUXES IN A SPRUCE FOREST
SPATIAL VARIABILITY OF THROUGHFALL FLUXES IN A SPRUCE FOREST
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DOI：
10.1016/0269-7491(93)90208-6
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发表时间：
1993-01-01
影响因子：
8.9
通讯作者：
GUNDERSEN, P
中科院分区：
文献类型：
--
作者：
BEIER, C;HANSEN, K;GUNDERSEN, P
研究了H+、Ca~(2+)、Mg~(2+)、Na~+、K~+、Cl~-、NO_3~-、NH_4~+和SO_4~(2-)在挪威云杉(Picea abies(L.)喀斯特。)1986年10月至1987年10月期间，对森林进行了深入调查。观测到了森林内大气沉积的大系统空间变异性。远离树干的穿透水通量高于靠近树干的穿透水通量。与此相反，所有物质在树干附近的沉积比在树冠外围的沉积要高得多。此外，还发现随着距离最近树干的距离，沉降量呈线性下降，不同树木的沉降量因其大小而有很大差异。观测到的穿透雨的空间变异性可能是由于参与改变降水在树冠上移动时的分布和组成的过程的变异性。讨论了降水、冲刷、干沉积和树冠交换等过程的影响，发现树顶干沉积增加和树冠交换都有助于树干附近较高的溶质通量。
The spatial variability of throughfall deposition of H+, Ca2+, Mg2+, Na+, K+, Cl-, NO3-, NH4+, and SO42- to a Norway spruce (Picea abies (L.) Karst.) forest was intensively examined during the period October 1986 to October 1987. Large systematic spatial variability of the atmospheric deposition within the forest was observed. The flux of throughfall water was higher away from the trunk compared to the flux close to the trunk. In contrast to this, the deposition of all substances was considerably higher close to the trunk compared to the deposition at the periphery of the canopy. A linear decrease in deposition as a function of the distance from the nearest tree trunk was found Further, the deposition varied quite dramatically between trees according to their size. The observed spatial variability in throughfall may be due to variabilities in the processes taking part in altering the distribution and composition of the precipitated water as it moves through the canopy. The influence of these processes of precipitation, wash-off, dry deposition and canopy exchange is discussed, and it is found that both increased dry deposition and canopy exchange in the tree tops contribute to the higher solute fluxes found close to the tree trunk.