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Typha; Growth (Plants); Plants--Mortality; Shoots (Botany)


A double sampling technique and permanent quadrats were used to monitor seasonal changes in shoot density and aboveground standing crop in three Minnesota Typha glauca populations. Shoot growth began several weeks later in stands located in floating mats (Boot Lake and Cedar Creek) relative to a nonfloating stand (Lauderdale). Mortality reduced shoot density by 10.8% at Boot Lake, 6.3% at Cedar Creek, and by 53% at Lauderdale. Shoot death was largely confined to smaller than average shoots at Boot Lake and Cedar Creek. At Lauderdale many relatively large shoots were killed by a lepidopteran stem borer (Archanara oblonga Grt.) or a mammalian herbivore. Peak standing crop occurred at different times at the three sites and was 329 g/m2 at Boot Lake, 645 g/m2 at Cedar Creek, and 868 g/m2 at Lauderdale. These values underestimated actual aboveground productivity by 4.9, 0.5, and 6.3% at the three sites, respectively.

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