Effects of mixed substrates of different agricultural and forestry residues on the cutting seedlings of .

To screen environment-friendly seedling cultivation substrates which could replace peat and with less cost, we compared the effects of different agricultural and forestry residue mixed substrates on cutting propagation of , in an experiment following randomized block design. There were five types of mixed substrates, including peat + vermiculite + perlite (T), edible mushroom residue (EMR) + vermiculite + perlite (T), carbo-nized rice husk (CRH) + vermiculite + perlite (T), EMR + slag + sawdust (T) and CRH + EMR + slag (T). The results showed that the bulk density of T was the lowest, followed by T, which significantly differed from other mixed substrates.

[Light response characteristics of photosynthesis and model comparison of Distylium chinense in different flooding durations].

The light responses of photosynthesis of two-year-old Distytum chinense seedlings subjected to a simulated reservoir flooding environment in autumn and winter seasons were measured by using a Li-6400 XT portable photosynthesis system, and the light response curves were fitted and analyzed by three models of the rectangular hyperbola, non-rectangular hyperbola and modified rectangular hyperbola to investigate the applicability of different light response models for the D. chinense in different flooding durations and the adaption regulation of light response parameters to flooding stress. The results showed that the fitting effect of the non-rectangular hyperbola model for light response process of D.

[Characteristics of soil seed banks in backwater area of Three Gorges Reservoir water-level-fluctuating zone at initial stage of river-flooding].

A germination test was made to study the characteristics of soil seed banks in the backwater area (including the flooded, non-flooded, and control areas of secondary bush and abandoned farmland) of Three Gorges Reservoir water-level-fluctuating zone. There existed significant differences in the soil seed banks between secondary bush and abandoned farmland, with an average seed density being 6991 +/- 954 seed per m2 and 26193 +/- 6928 seed per m2, respectively. Flooded area had the lowest seed density, while non-flooded area had the highest one.

[Life form spectra, leaf character, and hierarchical-synusia structure of vascular plants in Thuja sutchuehensis community].

Based on the investigation of the plants in Thuja sutchuenensis community, the life form spectra, leaf character, and hierarchical-synusia structure in the community were analyzed. The life form spectra of the plants in the community were 73.2% of phanemphyte, 18% of hemicryptophyte, 6% of geophyte, 2% of chamaephyte, and 0.