Short-term photosynthetic responses of Medicago ruthenia var. inschanicus to simulated yak and Tibetan sheep trampling and rainfall

doi:10.11686/cyxb2016130

Abstract

Abstract: To determine the effects of yak and Tibetan sheep trampling and rainfall on the photosynthetic characteristics of Medicago ruthenia var. inschanicus, the responses of single leaf area, chlorophyll content (SPAD value), and photosynthetic gas exchange parameters to short simulated yak and Tibetan sheep trampling and rainfall were studied with a two-factor (simulated trampling and rainfall) controlled experiment in a Tianzhu alpine meadow. The single leaf area, SPAD value, transpiration rate (T_r), stomatal conductance (G_s), and net photosynthetic rate (P_n) decreased with increasing yak and Tibetan sheep trampling intensity and declining rainfall, while the intracellular concentration of CO₂ (Ci) increased. Under the same rainfall conditions, the T_r, G_s, and P_n were all higher under a light trampling intensity of Tibetan sheep and yaks than in the control (no trampling), while the Ci was lower than that in the control. The magnitude of decreases in the single leaf area, SPAD value, T_r, G_s, and P_n, and increases in C_i were greater under heavy trampling by yaks than under heavy trampling by Tibetan sheep. Simulated rainfall alone or simulated trampling alone significantly affected the tested indicators, and the interaction between simulated rainfall and simulated trampling had a significant effect on single leaf area, T_r, G_s, P_n, and SPAD value (at the final trampling stage) of M. ruthenia var. inschanicus. These results showed that the photosynthesis of M. ruthenia var. inschanicus was promoted by light trampling, but inhibited by heavy trampling by Tibetan sheep and yaks. Compared with Tibetan sheep, yaks had stronger inhibitory effects on the photosynthetic activity of M. ruthenia var. inschanicus.

XIAO Hong, XU Chang-Lin, ZHANG De-Gang, ZHANG Jian-Wen, YANG Hai-Lei, CHAI Jin-Long, PAN Tao-Tao, WANG Yan, YU Xiao-Jun. Short-term photosynthetic responses of Medicago ruthenia var. inschanicus to simulated yak and Tibetan sheep trampling and rainfall[J]. Acta Prataculturae Sinica, 2017, 26(2): 43-52.

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