| To develop adaptive grazing management strategies, in growing season of 2013-2014, we carried out a grazing experiment, to study the effects of different grazing periods on the above ground net primary production (ANPP) in a typical steppe community of semi-arid area Xiwu, Inner Mongolia. We carry out our study in the herder household scale, with a height of 8-10 cm stubble as the rotational grazing time node. We can draw the conclusion as follows:1. Plot 2 above ground net primary production(ANPP) and sheep intake biomass are both significantly higher than other treatments. So rotational grazing time configured as plot 2 is the optimal grazing method.2.2013 and 2014 data showing, both plot 4 and plot 2 grassland utilization rates are higher than 55%, grassland utilization rate of plot 4 is the highest.3. Plot 2 has the highest community growth rate at regrowth period. All treatments community growth rate at regrowth period are positive and they can compensate flock grazing quantity for the first rotational grazing.2014 data showing, all treatments community is equal-compensation growth in growing season.4. All plot root biomass decreasing with soil depth, and root biomass mainly concentrated in 0-20cm layer, showing superficial trend. Plot 1 root biomass is significantly lower than other treatments and there are no significant differences among the other treatments.5. Below ground biomass vertical variation trend are various among different treatments, which can be divided into two categories. One is the root biomass enriched in the upper layer and declined in the under layer, and the other is the root biomass declined in the upper layer and enriched in the under layer.6. Soil organic matter mainly concentrated in the superficial layers of the soil, which is decreasing with soil depth for all cells. Soil organic matter of plot 4 was significantly higher than the other three cells, which is Especially obvious in the 0-5 cm soil layer. |
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