Shifting patterns in fine root distribution of four xerophytic species across soil structural gradients and years of growth.

Fine root biomass, length density, and specific root length all showed an increasing trend with the increase in RFC and were significantly correlated with the decrease in both SWC and available phosphorus (Figure 7 ). 4 DISCUSSION Our findings partly support the first hypothesis that the vertical depth of fine roots in woody species increases with increasing RFC.

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Over the years, the variation ranges in fine root depth, biomass, and length density along the RFC gradient showed a decreasing trend in three woody species (Figure 2 ), which was consistent with our second hypothesis.

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