5 Conclusions
Water availability significantly increased the total biomass of plant species. Remarkably, water availability affected the biomass allocation of plants, which were modified by species. Generally, increasing water availability did not impact or increased R: S of plant species that dominant in the lightly degraded grasslands, while it decreased R: S of plant species that dominant in the heavily degraded grasslands. Thus, biomass allocation of plants is an important indicator to explore the responses of plants to climate change, which should be further explore by considering more complicated conditions such as jointed effects of temperature and precipitation.