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Table S1. Results (F ratios and P values) of four-way anova on the main and interactive effects of year, block, water addition (W), shading (S) on soil respiration (Soil R), soil temperature (Soil T), soil moisture (Soil M), aboveground and belowground net primary productivity (ANPP and BNPP) (n=5).

Table S2. Results of (F ratios and P values) repeat-measurement anova on the effects of sampling time (Time), water addition (W), shading (S), and their interactions on soil respiration (Soil R), soil temperature (Soil T), temperature-independent soil respiration (Soil R_TIN), leaf gas exchange for the two dominant grass species (S. krylovii, S.k.; A. cristatum, A.c.; Pn_S.k; Pn_A.r.).

Table S3. Results of stepwise regression analyses between mean soil respiration and soil temperature (Soil T), soil moisture (Soil M), ANPP, BNPP, MBC and MBN in the growing seasons of 2008 and 2009.

Figure S1. Linear relationships of growing season mean soil respiration with aboveground and belowground net primary productivity (ANPP, a; BNPP, b), microbial biomass C and N (MBC, c; MBN, d) in 2008 and 2009, respectively.

Figure S2. Diurnal variations of leaf sugar (left panels) and starch (right panels) contents of the three dominant species (A. cristatum, A. frigida and S. krylovii) under different treatments on August 4–5, 2008. CC: control plots (solid circle); CS1: low shading (solid triangle); CS2: high shading (solid square); WC: water addition (open circle); WS1: water addition plus low shading (open triangle); WS2: water addition plus high shading (open square). Values represent the Mean±SE (n=3).

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