img

Wechat

Adv search

JOURNAL OF DESERT RESEARCH ›› 2016, Vol. 36 ›› Issue (1): 190-198.DOI: 10.7522/j.issn.1000-694X.2014.00161

Previous Articles     Next Articles

Soil Evaporation of Haloxylon ammodendron Community in the Southern Gurbantunggut Desert

Chen Yongbao1,2,3, Hu Shunjun1, Zhun Hai1,2, Luo Gen3   

  1. 1. State Key Laboratory of Desert and Oasis, Xinjiang Institute of Ecology and Geography, Chinese Academic of Sciences, Urumqi 830011, China;
    2. University of Chinese Academic of Sciences, Beijing 100049, China;
    3. Hubei Province Coal Geology 125 Team, Yichang 443000, Hubei, China
  • Received:2014-08-19 Revised:2014-10-10 Online:2016-01-20 Published:2016-01-20

Abstract: Soil evaporation is an ineffective loss of rainfall, it directly determines the amount of rainfall that will eventually become soil water,which is available to plants.In the desert area where soil water is rare and valuable, study of soil evaporation is more important than that in other regions. Haloxylon ammodendron community of native desert was selected to quantify the mechanism of soil evaporation in Gurbantunggut Desert. To evaluate the soil evaporation pattern, we examined field soil evaporation experiment from April to October in 2013 using micro-lysimeter with precipitation data, analyzed the soil evaporation characteristic of H. ammodendron shrub and naked land, the different directions, slope positions (eastern slope, western slope, top of slope and inter-dune) were away from shrub base and after rain. Simulate the relationship between soil evaporation and soil water content was done by yield control experiment. Results showed that the soil evaporation presented the similar pattern with seasonal precipitation. The influences of vegetation on soil evaporation are not absolutely only either promotes or inhibits, compared with naked land, the soil evaporation of land under H. ammodendron canopy was higher in the germination period (April to May), less in the exuberant period (June to September), and little differences in the litter period (October). The intensity of soil evaporation under H. ammodendron canopy in different directions following the order: west, north > east > south, the shorter the distances to H. ammodendron base, the less the soil evaporation. The soil evaporation was between the different slope positions. For soil evaporation, the greatest value occurred in western, followed by inter-dune and eastern slope, top of slope's is smallest. Compared with the top of slope, the cumulative seasonal soil evaporation of western slope, inter-dune and eastern slope were 1.26 times, 1.09 times, 1.14 times throughout the growing season, respectively. Soil evaporation over time after the rain approximate negative presented exponential reduction, soil evaporation and soil water content showed exponential relationship, and the topsoil water content could be used to infer soil evaporation when topsoil water content is low.

Key words: Gurbantunggut Desert, soil evaporation, soil water content, Haloxylon ammodendron, micro-lysimeter

CLC Number: