水淹对水杉苗木耐旱性的影响

doi:10.11707/j.1001-7488.20141122

Abstract

Abstract:

Photosynthetic and growth responses of two-year-old Metasequoia glyptostroboides seedlings to drought following flooding were explored upon simulating water level change in the hydro-fluctuation belt of the Three Gorges Reservoir Area (TGRA). The seedlings were subjected to treatments of six water regimes, including control (C), control followed by drought (CD), continuous half-submersion (HS), half-submersion followed by drought (HSD), continuous full-submersion (FS) and full-submersion followed by drought (FSD). Results showed that net photosynthetic rate (P_n) of M. glyptostroboides seedlings in the HS group (submersion for 60-day) was significantly higher than that in C group. Conversely, a submersion for 120 d, the P_n in HS, and root and total biomass were significantly lower than that in C. However, under drought treatment, the P_n and stomatal conductance (S_c) in CD and HSD were significantly decreased as compared to that in C, while there were no significant differences in P_n and S_c between FSD and C. Similarly, the root and total biomass significantly declined in all of the three drought conditions compared to C. By the end of the recovery period, P_n and S_c of the seedlings under different water stresses were increased to a comparable level as that of C, respectively, except for the P_n in HSD and FS. These results indicated previous flooding had no detectable effect on subsequent sensitivity of M. glyptostroboides seedlings to drought. The M. glyptostroboides showed certain adaptation to the flooding and drought, and thus can be considered as a candidate for the restoration in the hydro-fluctuation belt of the TGRA.

Key words: water stress, Metasequoia glyptostroboides, photosynthesis, biomass, the Three Gorges Reservoir Area

CLC Number:

S718.43

Bai Linli, Li Changxiao. Effects of Submersion on Susceptibility of Metasequoia glyptostroboides Seedlings to Drought[J]. Scientia Silvae Sinicae, 2014, 50(11): 166-174.

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Effects of Submersion on Susceptibility of Metasequoia glyptostroboides Seedlings to Drought

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