关键词: 森林火险天气, 拉尼娜, 厄尔尼诺

Abstract: In rice-duck farming system, diverse duck behaviours may influence rice growth and the microenvironment. Here, a pot experiment was conducted to clarify the effects of soil vibration that simulated the duck trampling on the aboveground part of Oryza sativa. Four intensities of soil vibrations including 0 (CK), 9 (SV9)，39 (SV39), 90 (SV90) s·d^-1·pot^-1 were applied for 21 days, using a handmade device to simulate the vibration of duck activities. High intensity of vibration (SV90) significantly reduced leaf surface area and leaf chlorophyll content. The moderate intensity of vibration (SV39) significantly increased soluble protein content. The N contents in the aboveground parts in SV9, SV39 and SV90 treatments increased by 20%, 16% and 12% respectively. The Mg contents in SV9, SV39 and SV90 treatments increased by 25%, 20% and 11%, respectively, while Ca contents increased by 24%, 15% and 8%, respectively. The low intensity of vibration (SV9) increased leaf SOD activity, while both the low intensity and moderate intensity of vibrations increased the leaf POD activities. The moderate intensity of vibration significantly enhanced the leaf CAT activity. The high intensity of vibration significantly increased the content of malondialdehyde in leaves. The low intensity of vibration increased the contents of available N and available P. Our results suggest that soil vibration has significant effects on the morphological and physiological characteristics of the aboveground parts of rice, providing technical parameters for the design of mechanical stimulators to control rice growth.

Key words: El Ni?o, forest fire weather, La Ni?a