CHANGES IN THE CHEMICAL-COMPOSITION OF ALDER, POPLAR AND WILLOW LEAVES DURING DECOMPOSITION IN A RIVER
CHANGES IN THE CHEMICAL-COMPOSITION OF ALDER, POPLAR AND WILLOW LEAVES DURING DECOMPOSITION IN A RIVER
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DOI：
10.1007/bf00018164
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发表时间：
1987-05-10
期刊：
影响因子：
2.6
通讯作者：
CHAUVET, E
中科院分区：
文献类型：
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作者：
CHAUVET, E
(1)柳树(Salix Alba)、杨树(Pillius gr.用网袋技术研究了法国加隆地区6个月来叶片中的化学成分变化。(2)3种树种叶片有机质消失率基本相同(赤杨k=0.0065 d-1，杨树k=0.0054 d-1，柳树k=0.0050 d-1)。碳量的变化与有机质的变化相当。氮和有机磷在分解的前几个月积累。三个树种叶物质的C/N比变化规律相同，第一个月急剧下降，然后趋于平稳。糖分很快就消失了，尤其是赤杨和柳树。在整个分解过程中，纤维素浓度保持不变，而木质素的数量在最初几个月有所增加，但后者可能是由于微生物化合物的干扰。(3)碳、糖、纤维素等组分的变化可用指数或多指数模型来描述。尽管C/N和木质素/N的初始比有很大的不同，但这些与叶片分解相关的变化对于这三个物种来说是相似的。
(1) As there was a paucity of information on the aquatic decomposition of leaves of willow (Salix alba), poplar (Populus gr. nigra) and alder (Alnus glutinosa), the net-bag technique was used to study chemical changes in the leaves over a period of six months in the Garonne (France). (2) The disappearance rates of foliar organic matter were about similar for the three species (k = 0.0065 day-1 for alder, k = 0.0054 day-1 for poplar and k = 0.0050 day-1 for willow). Changes in carbon amount were comparable to those of organic matter. Nitrogen and organic phosphorus accumulated during the first months of decomposition. The C/N ratios of foliar matter changed in the same way in the three species, falling steeply for the first month, then levelling off. Amounts of sugar disappeared very rapidly, particularly for alder and willow. Cellulose concentrations were constant throughout the whole decomposition process whilst an increase in the amounts of lignin was observed during the first months; however the latter could be due to an interference by microbial compounds. (3) The changes of some constituents, such as carbon, sugars and cellulose, were described with exponential or multiexponential models. Despite the very different initial ratios of C/N and lignin /N, these changes associated with leaf decomposition were similar for the three species.