干旱区研究

Arid Zone Research ›› 2016, Vol. 33 ›› Issue (5): 1028-1035.doi: 10.13866/j.azr.2016.05.16

• Biological Resources • Previous Articles     Next Articles

Estimation of RS-based Biomass of Phragmites communis in Wetland of the Ulansuhai Lake

BAO Han1, ZHUO Yi1, LIU Hua-min2, LIU Dong-wei1, QING Hua1, WEN Lu1, WANG Li-xin1,3   

  1. 1. School of Environment and Resources, Inner Mongolia University, Hohhot 010021, Inner Mongolia,China;
    2. School of Life Sciences, Inner Mongolia University, Hohhot 010021, Inner Mongolia,China;
    3. Sino-US Center for Conservation, Energy and Sustainability Science in Inner Mongolia, Hohhot 010021, Inner Mongolia,China
  • Received:2015-01-14 Revised:2015-04-16 Online:2016-09-15 Published:2025-12-01

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Abstract: In this study, the biomass values of Phragmites communis in the Ulansuhai Lake in Inner Mongolia were estimated by the means of quantitative remote sensing. Based on monitoring the biomass in growing season of Phragmites communis on the fixed locations, the correlations between the measured data of fresh weight and dry weight at different monitoring points and the four vegetation indexes (NDVI, DVI, PVI and RVI) in the same period were analyzed. The linear estimation model and a variety of non-linear estimation models were developed. The results showed that there were the significant positive correlations between the aboveground biomass (including fresh weight and dry weight) of Phragmites communis in the Ulansuhai Lake and the selected four vegetation indices. The optimal models of fresh weight and dry weight were all based on the cubic polynomial estimation model of NDVI. The accuracy test results showed that the predicted values were close to the measured ones by using NDVI cubic polynomial model to calculate the fresh weight and dry weight. The average error of fresh weight was 19.90%, and the fitting accuracy was as high as 80.10%. The average error of dry weight was 18.71%, and the fitting accuracy reached 81.29%. These could meet the need of macro estimation of regional biomass of Phragmites communis in the Ulansuhai Lake. Through analyzing the spatial distribution of biomass of Phragmites communis in the study area in July 2013, it could be obtained that the dry and fresh weights of biomass of Phragmites communis varied in ranges of 1 000-1 500 g·m-2 and 3 000-4 500 g·m-2 respectively.

Key words: TM image, Phragmites communis, biomass, vegetation index, inversion model, Ulansuhai Lake