Relationship between structure and aboveground biomass of typical steppe and climate in Inner Mongolia
Wang Yifeng
DOI:
Received June 12, 1990,Revised , Accepted , Available online
Volume 2,1990,Pages 19-30
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Typical steppe in Inner Mongolia belongs to a part of Central Asia sub-region in Eurasian temperate steppe region. In climate distinct wet and dry season, coherence of water and heat result in single peak type of seasonal dynamic of steppe biomass. Community biomass has linear regressional equation with community height, its correlation coefficient (R) is 0.959***. Growth rate of biomass in June, July and August is usually at 1.5-3.0 g/m2. d-1. Community standing dead occurs in June and equates green living biomass by mid-September. Community biomass is only standing dead biomass in the mid-October. Biomass, green production and standing dead have linear regressional relation with days of plant growing, their correlation coefficient (R) are 0.9919***, 0.9878*** and 0.9923***, respectively. Yearly dynamic of typical steppe biomass is variable, the maximum value is 2.4 times as much as the minimum. The peak biomass of Stipa grandis steppe was 87g/m2 in dry 1980 and 210g/m2 in rainy 1981, and their height and coverage were 60cm and 30% in 1980, 95cm and 40% in 1981. Major population biomass and individual plant dry weight at the peak time in 1980 is 50-70% lower than in 1981. In 1980, grass over the layer of 40 cm high became dead and community standing dead biomass amounted to 32.07% of the total production, 2.5 times as much as that in 1981 (13.08%). In addition, growth rate of biomass before the peak time in 1980 were negative value for 2 times. Seasonal dynamic curve of dry matter content is in negative proportion to biomass increase and dry matter content is higher in dry 1980 than in rainy 1981.
