Estimation of alpine grassland biomass and analysis of its spatial distribution characteristics in typical small watershed of Qilian Mountain
SU Yubo1, ZHANG Fuping1,2*, FENG Qi2, WEI Yongfen3,LI Guangwen1, MA Qianqian1 , SONG Zhiyuan1
(1 School of Tourism and Environment Sciences, Shaanxi Normal University, Xi′an 710119, Shaanxi, China; 2 Cold and Arid Regions Environment and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China;3 River Basin Research Center, Gifu University, Gifu 501-1193, Japan）
Abstract:
Based on the field survey data, the alpine meadow and alpine grass biomass were estimated with the statistical analysis method in Babao river basin located in Qilian Mountain firstly. Then, in combination with the normalized difference vegetation index (NDVIGS) examined by GreenSeeker and NDVILD, derived from multi-spectral remote sensing data of the same period, a regression model to estimate the alpine grassland biomass was established, and a quantitative assessment was also carried out.The result shows that the average of aboveground and belowground biomass were estimated to be 216.78 g/m2 and 2 985.07 g/m2, respectively. Through comparing models (linear, exponential, and logarithmic) used to estimate the aboveground biomass of alpine grassland, it found that the best fitting one is the exponential relation (n=40，R2=0.731，P
KeyWords:
alpine grass; biomass; model; spatial distribution
