| Primary study on the allocation pattern of grassland biomass under soil water gradient of Bird Island in Qinghai Lake |
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| DOI：10.7606/j.issn.1000-7601.2014.03.034 |
| Key Words: grassland biomass isometric growth soil water content Bird Island in Qinghai Lake |
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| Abstract: |
| In this paper, we have investigated the height, root length from the individual and community level and the allocation of biomass above and below ground under different soil water gradient of the Bird Island area in Qinghai Lake. In order to: (1) investigate the effects of different soil water gradient to the grassland height, root length, biomass above and below ground by small scale; (2) inspect the isospeed growth theory from the individual and community level; (3) provide data support to estimate the biomass belowground for the areas around Qinghai Lake and discuss the impact of environmental factor to R/S. The results showed that: From the individual level, the height, root le
ngth and biomass above and below ground total were decreased with the increase of soil water content. From the community level, the biomass above ground were increased with the increase of soil water content; but the biomass below ground was decreased with the increase of soil water content. From individual level, the ratio between root length and height was 0.3 to 6.0, the mean and median values
was 1.6 and 1.3, respectively; and the ratio between the biomass above and below ground was 0.4 to 11.3, the median and mean values was 2.5 and 1.5, respectively, From the community level, the change range of the biomass above ground was 221.59 to 352.77 g·m-2, the change range of the biomass bellow ground was 741.98 to 1182.20 g·m-2; the ratio between the biomass above and bellow ground was 1.4 to 7.1, the median and mean values was 3.0 and 1.9, respectively. The soil water content has affected the height, root length and allocation of the biomass whether the individual or community level. This basically expressed as: From the individual level, the height, root length and biomass above and below ground, total were decreased with the increase of soil water content. From the community level, the biomass above ground was increased with the increase of so
il water content; but the biomass below ground was decreased with the increase of soil water content. In this area, the biomass distribution rule of the grassland don’t support the hypothesis of isospeed growth whether individual or community level. |
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