SITE-RELATED DELTA-C-13 OF TREE LEAVES AND SOIL ORGANIC-MATTER IN A TEMPERATE FOREST
SITE-RELATED DELTA-C-13 OF TREE LEAVES AND SOIL ORGANIC-MATTER IN A TEMPERATE FOREST
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DOI：
10.2307/1939930
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发表时间：
1993-09-01
期刊：
影响因子：
4.8
通讯作者：
MARIOTTI, A
中科院分区：
文献类型：
--
作者：
BALESDENT, J;GIRARDIN, C;MARIOTTI, A
为了将土壤有机质的同位素组成与母源植被和土壤类型联系起来，我们测量了温带森林中14个地点的树叶和土壤C的碳稳定同位素比值。地点选择了各种各样的土壤类型和相关的植被协会，但在一个单一的区域气候。落在土壤上的大量叶片物质的δ C-13在不同地点之间变化，范围从千分之-29.5到-26。在这个范围内，高达千分之1.5的差异可归因于树种的差异。其他差异与部位有关。土壤有机质的δ C-13值范围为-29.8 ~-24.3ppm，并随母质植被δ C-13和深度而变化。凋落物层内的有机碳的转化和衰变导致没有同位素富集，无论植被和腐殖质类型：穆尔，hydromull，moder，或anmoor。凋落物中木质和树叶材料之间的差异很小，为0.23 +/- 0.35份/千（平均值+/- 1 SD）。另一方面，矿物层中的δ C-13总是随深度增加，在20 cm处达到比凋落物丰富1.0 +/- 0.5份/千份的值，在1 m处达到+1.5份/千份。这种趋势是独立的土壤理化特性，无论是好氧，厌氧，富营养化，贫营养化，或灰化。森林土壤有机碳的同位素比值似乎提供了有用的树木同位素组成的估计。与植被测量相比，它们提供了一个容易获得的值的优势，该值自然地整合了植物材料，时间和最终的局部区域。
In order to relate the isotopic composition of soil organic matter to parent vegetation and soil type, we measured the carbon stable isotope ratios of tree leaves and soil C at 14 locations in a temperate forest. Sites were selected over a wide variety of soil types and related vegetation associations, but within a single regional climate. The deltaC-13 of the bulk leaf material falling on the soil varied among sites, ranging from -29.5 to -26 parts per thousand. Within this range, differences up to 1.5 parts per thousand were attributable to differences in tree species. Further differences were related to site. The deltaC-13 values of soil organic matter cover the range -29.8 to -24.3 parts per thousand and varied with both parent vegetation deltaC-13 and depth. Transformation and decay of organic C within the litter layers led to no isotope enrichment, irrespective of vegetation and humus type: mull, hydromull, moder, or anmoor. The difference between woody and leaf material in litter was low, 0.23 +/- 0.35 parts per thousand (mean +/- 1 SD). On the other hand deltaC-13 in mineral horizons always increased with depth, reaching values richer than litter by 1.0 +/- 0.5 parts per thousand at 20 cm and up to + 1.5 parts per thousand at 1 m. The trend was independent of the soil physico-chemical characteristics, whether aerobic, anaerobic, eutrophic, oligotrophic, or podzolic. Isotope ratios of soil organic C in forests appear to provide useful estimators of tree isotopic composition. When compared to the measurements of the vegetation, they offer the advantage of an easily obtained value that naturally integrates over plant material, time and, eventually, local area.