Effects of nutrient enrichment on yellow poplar leaf decomposition and fungal activity in streams

被引:98
作者
Grattan, RM [1 ]
Suberkropp, K [1 ]
机构
[1] Univ Alabama, Dept Biol Sci, Tuscaloosa, AL 35487 USA
来源
JOURNAL OF THE NORTH AMERICAN BENTHOLOGICAL SOCIETY | 2001年 / 20卷 / 01期
基金
美国国家科学基金会;
关键词
aquatic fungi; streams; nitrogen; phosphorus; nutrient limitation; leaf decomposition; fungal biomass; ergosterol; sporulation rates; yellow poplar leaves;
D O I
10.2307/1468186
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
We examined the effect of nutrient addition on rates of decomposition, ergosterol concentrations las a measure of fungal biomass), and rates of fungal sporulation associated with yellow poplar.(Liriodendron tulipifera L.) leaf disks in 3 streams that differed in water chemistry. We carried out these studies in flow-through channels that received additions of KH2PO4, NaNO3, both nutrients, or controls with no additions. When limiting nutrients were added to the water in all 3 streams, leaf-decaying fungi responded and decomposition rates increased. Two streams, Walker Branch and Payne Creek, contained low concentrations of both inorganic N (<40 <mu>g/L) and P (<16 <mu>g/L). In these streams, rates of leaf decomposition concentrations of fungal biomass, and rates of sporulation were stimulated only when N and P were added together, indicating that these nutrients potentially colimited fungal activity. The other stream, Little Schultz Creek, contained low concentrations of P (<5 <mu>g/L) but higher concentrations of N (65-200 mug/L) than Walker Branch and Payne Creek. Rates of leaf decomposition, fungal biomass, and sporulation were stimulated by P addition and when both nutrients were added together, indicating potential limition of fungal activity by P in this stream. Results from all 3 streams provide direct experimental evidence that leaf-decaying fungi can use nutrients dissolved in stream water and that, in some streams, rates of leaf decomposition are stimulated by the addition of these nutrients.
引用
收藏
页码:33 / 43
页数:11
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