Effect of simulated precipitation change on growth, gas exchange and chlorophyll fluorescence of Caragana intermedia in Maowusu sandland

Abstract

Abstract: Morphology, biomass, gas exchange and chlorophyll fluorescence were measured for seedlings of C.intermedia,a dominant shrub, to the change of global precip ita tion by artificially controlling the water supply at four levels. The results sh owed that the seedling variables, such as plant height, stem diameter, leaf numb er, leaf area and dry biomass, photosynthetic rate, transpiration rate, stomatal conductance, and water use efficiency, were affected by different water supply, and those variables of the seedlings treated by the 157.5mm or 630mm water supp ly were significantly less than those of the seedlings treated by the 472.5mm wa ter supply. PSII photochemical efficiency and maximal fluorescence/initial fluor escence of the seedlings treated by 157.5mm and 630mm water supply were much sig nificantly lower than those of the seedlings treated by 472.5mm water supply. Wa ter supply obviously affected dry biomass distribution of the seedlings, and the root / shoot dry biomass clearly decreased with the increase of water supply.

CLC Number:

Q145⁺.2

XIAO Chunwang, ZHOU Guangsheng . Effect of simulated precipitation change on growth, gas exchange and chlorophyll fluorescence of Caragana intermedia in Maowusu sandland[J]. Chinese Journal of Applied Ecology, 2001, (5): 692-696.

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