Plateau Meteorology

Plateau Meteorology >

2019 , Vol. 38 >Issue 3: 650 - 659

DOI: https://doi.org/10.7522/j.issn.1000-0534.2018.00133

Characteristics of Carbon Flux in Sandy Grassland Ecosystem under Natural Restoration in Horqin Sandy Land

  • CHEN Yinping ,
  • NIU Yayi ,
  • LI Wei ,
  • LI Yuqiang ,
  • GONG Xiangwen ,
  • WANG Xuyang
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  • School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730000, Gansu, China;Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China;University of Chinese Academy of Science, Beijing 100049, China;Northwest Agriculture and Forestry University, Yangling 712100, Shaanxi, China

Received date: 2018-09-14

  Online published: 2019-06-28

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Abstract

The characteristics of net ecosystem CO2 exchange (NEE) at different time scales were investigated in sandy grassland ecosystem under natural restoration in Horqin Sandy Land, based on the year-round (1 January 2017~31 December 2017) eddy covariance system. The results showed that:1) The monthly mean diurnal variation of NEE changed apparently with a single peak curve; there were obvious absorption peaks during the growing season (from May to September) while obvious release peaks during the non-growing season (from October to April). At the seasonal scale, the absorption peak and the release peak appeared alternately; the growing season was a carbon sink (with a net CO2 absorption of 202.11 g·m-2), whereas a carbon source for non-growing season (with a net CO2 release of 298.13 g·m-2). The annual carbon budget of the sandy grassland ecosystem showed a carbon source, with a net CO2 release of 96.02 g·m-2·a-1. 2) The NEE was significantly (P < 0.01) negatively linearly related to the temperature (both air and soil temperatures) during the growing season, but on the contrary during the non-growing season. However, the NEE was significantly (P < 0.01) positively linearly related to the soil water content during both the growing and non-growing seasons. The temperature and soil water content had significant synergistic effect on NEE.

Key words： Horqin Sandy Land; Sandy grassland; Net ecosystems CO; Environmental factor

Cite this article

CHEN Yinping , NIU Yayi , LI Wei , LI Yuqiang , GONG Xiangwen , WANG Xuyang . Characteristics of Carbon Flux in Sandy Grassland Ecosystem under Natural Restoration in Horqin Sandy Land[J]. Plateau Meteorology, 2019 , 38(3) : 650 -659 . DOI: 10.7522/j.issn.1000-0534.2018.00133

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