[Effects of benthic macro-invertebrate on decomposition of Acer buergerianum leaf litter in streams].
By using composite mesh bag method, the effects of benthic macro-invertebrate in an undisturbed stream and an ecologically restored stream on the decomposition process of Acer buergerianum leaf litter from the Purple Mountain of Nanjing in winter were studied. After 112 days of decomposition, the remaining rate of A. buergerianum leaf litter based on ash-free dry mass was 31-62%, and the decomposition rate followed a declined exponential equation (P < 0.05). In the flowing water of the undisturbed and ecologically restored streams, the decomposition rate of leaf litter was 0.0064 d(-1) and 0.0030 d(-1); while in the still water of the streams, it was 0.0016 d(-1) and 0. 0018 d(-1), respectively. The abundance and biomass of benthic macro-invertebrate were significantly higher in the flowing water of undisturbed stream than in that of ecologically restored stream (P < 0.05), but had no significant differences in the still water of the two streams. Shredders (mainly Asellus sp.) had the highest abundance (70.4%) in the flowing water of undisturbed stream, while filterers (mainly Tanytarsus sp.) were dominant (37.8%) in the flowing water of ecologically restored stream. The decomposition rate of the leaf litter was significantly correlated with the richness and abundance of shredder species in flowing water (P < 0.01), but had less correlation with the biomass of the shredders, suggesting that the decomposition of A. buergerianum leaf litter in streams in winter was more dependent on the richness and abundance of shredders.
Department of Entomology, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China. jlhong1020@yahoo.com.cn
Li-Hong
LH
Jiang
Bei-Xin
BX
Wang
Ai-Qing
AQ
Chen
Ce-Jie
CJ
Lan
D031002:Acer / Q000378:metabolism*; D000818:Animals; D001673:Biodegradation, Environmental; D002681:China; D005618:Fresh Water; D007448:Invertebrates / Q000378:metabolism* / Q000502:physiology; D018515:Plant Leaves / Q000378:metabolism*; D012621:Seasons