林下灌草层对水分截持能力较低。
The water-holding capacity of shrub-grass layer under canopy was inferior.
各高度草层的选择性随季节推移和放牧率不同而发生变化。
The selectivity index for height layer varies with seasons and stocking rate.
结果表明：混播可提高河滩地草场的产量，改善草层品质。
The results showed that mixed sowing grasses not only can raise the productivity but also can improve the pasture quality.
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