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JOURNAL OF DESERT RESEARCH ›› 2017, Vol. 37 ›› Issue (5): 961-969.DOI: 10.7522/j.issn.1000-694X.2016.00148

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Soil Respiration Characters and Its Response to Hydrothermic Factors over Different Land Cover Types in the Middle Reaches of the Heihe River Basin

Niu Ruixue1, Liu Jiliang2, Hu Yanping3, Fu Ying1   

  1. 1. Institute of Scientific and Technical Information of Gansu, Lanzhou 730000, China;
    2. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
    3. Lanzhou Petrochemical College of Vocational Technology, Lanzhou 730060, China
  • Received:2016-09-19 Revised:2016-11-24 Online:2017-09-20 Published:2017-09-20

Abstract: The soil respiration and its response to hydrothermic factors over six land cover types (e.g., old irrigation farm land, new irrigation farm land, poplar plantation, pine plantation, Haloxylon ammodendron plantation, and desert grassland) have been studied in the middle reaches of the Heihe River Basin. The results show that the soil respirations are significant different over six land cover types. The soil respiration over irrigation farmland is much larger than that over artificial woods plantation (e.g., poplar plantation, pine plantation); and that over artificial woods plantation is larger than over desert grassland and H. ammodendron plantation. The soil respiration rate is proportional to the surface temperature, with the Q10 value between 1.14 and 1.31, which is below the world average level. Furthermore, the soil respiration shows an exponential increase with soil moisture. The characteristics of soil respiration are closely related to the hydrothermic factors over the six land cover types, indicating that the land changes dominated by human activities can significantly affect the interactions of water, soil, air and biological factors in desert oasis ecological system.

Key words: middle reaches of the Heihe River Basin, land cover, soil respiration, hydrothermic factors

CLC Number: