摘要
This paper reports a vascular plant study which showed that :1. Five species of vascular plants Potemogeton crispus L., Batrachium bungei L ., Myriophyllum spicatum L., Potemogeton maackianus A. Bennet and Ceratophyllum demersum L . lived under ice during winter in northern China . The freshweight biomass varied from 8 3087 g/m2 in the order P . crispus >P. maackianus>M. spicatum > C. demersum > B. burngei . 2. The oxygen produced by these plants through photosynthesis vaned from 0.11 t0 1.91 mg/(h·g)(plant) in the ordered P. crispus > B. bungei >M. spicatum >C. demersum . 3. The light compensation point of P. crispus at 2.5℃ was 99 lx, that of B. bungei was 168 lx;that of M. Spicatum was 207 lx; and that of C . demersum was 176 lx. The light saturation point of P . crispus was 13749 lx, that of B. bungei was 27697 lx. 4. Special biological characteristics enable certain vascular plants to survive and have high photosynthetic productivity in waterbodies covered with ice tens of centimeters thick .
This paper reports a vascular plant study which showed that: 1. Five species of vascular plantsPotemogeton crispus L.,Batrachium bungei L.Myriophyllum spicatum L.,Potenogeton maackianus A. Bennet andCeratophyllum demersum L., lived under ice during winter in northern China. The freshweight biomass varied from 8–3087 g/m2 in the orderP. crispus>P. maackanus>M. spicatum>C. demersum>B. bungei.
2. The oxygen produced by these plants through photosynthesis varied from 0.11 to 1.91 mg/(h·g) (plant) in the orderedP. crispus>B. bungei>M. spicatum>C. demersum.
3. The light compensation point ofP. crispus at 2.5°C was 99 lx; that ofB. bungei was 168 lx; that ofM. spicatum was 207 lx; and that ofC. demersum was 176 lx. The light saturation point ofP. crispus was 13749 lx; that ofB. bungei was 27697 lx.
4. Special biological characteristics enable certain vascular plants to survive and have high photosynthetic productivity in waterbodies covered with ice tens of centimeters thick.
