Effect of Extreme Precipitation Event on Annuals in the Horqin Sandy Land

doi:10.7522/j.issn.1000-694X.2014.00169

JOURNAL OF DESERT RESEARCH ›› 2016, Vol. 36 ›› Issue (1): 50-56.DOI: 10.7522/j.issn.1000-694X.2014.00169

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Effect of Extreme Precipitation Event on Annuals in the Horqin Sandy Land

Ma Yunhua^1,2, Zhang Tonghui¹, Liu Xinping¹, Mao Wei¹, Yue Xiangfei¹

1. Cold and Arid Regions of Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
2. Guizhou University of Engineering Scence, Bijie 551700, Guishou, China

Received:2014-06-07 Revised:2014-12-13 Online:2016-01-20 Published:2016-01-20

Abstract

Abstract: Precipitation records of Naiman Meteorological station in recent 40 years depict a rain fall pattern of low intensity and high frequency. Rainfall events ≥10 mm accounted only for 10% of total rainfall frequency, 10-25 mm of rainfall accounts for 7% of total, 25-50 mm of rainfall accounts for 2% of total.Rainfall more than 10 mm is an extreme precipitation in the region according to the method of the probability density function. The total rain of the experiment were 2 levels which were mean value of natural rainfall and doubling the value while the treatments were16 mm and 32 mm each time. The number of plants, biodiversity index, biomass and root-shoot ratio of annuals were studied to explore the response of annuals to the extreme precipitation event under simulated rainfall in the Horqin Sandy Land. There were five treatments which is T_I、T₂、T₃、T₄ (T₁, total 288 mm and 18 times;T₂,total 288 mm and 9 times;T₃,total 576 mm and 36 times;T₄,total 576 mm and 18 times,and CK,received natural rainfall in 2011). The results shows that the plant density was about 2 000·m^-2 with no significant difference among the five treatments during the germination period.T₂ and T₂ were at about 400·m^-2 while T_I and T₂ were at about 1 600·m^-2 which were a little larger than CK (1 200·m^-2) in the late stage of annuals growth,which showed that total rainfall determine the number of annuals which be able to finish its growth cycle. T₁, T₂ and T₃increased the biodiversity index of annuls significantly,which illustrated that the biodiversity index of the annuals doesn't simply be determined by the total rainfall, but the distribution of rain quantity each time and rainfall frequency. The T₂ and T₂ reduced the water use efficiency significantly which due to the water infiltration depth is greater than the range of root, and annuals couldn't make full use of the rain under the extreme rainfall pattern. In other words, the extreme rainfall pattern doesn't benefit the amount of dry matter of annuals in the Horqin Sandy Land.

Key words: extreme precipitation event, Horqin Sandy Land, annuals, ANPP, WUE

CLC Number:

Q948.11

Ma Yunhua, Zhang Tonghui, Liu Xinping, Mao Wei, Yue Xiangfei. Effect of Extreme Precipitation Event on Annuals in the Horqin Sandy Land[J]. JOURNAL OF DESERT RESEARCH, 2016, 36(1): 50-56.

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Effect of Extreme Precipitation Event on Annuals in the Horqin Sandy Land

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