Estimation of biomass based on HJ-HSI data in Seriphidium transiliense desert grassland

The aboveground biomass of degraded Seriphidium transiliense desert grassland areas under different utilisations (N: fenced area, W1: unfenced and heavily degraded area, and W2: unfenced and moderately degraded area) were estimated using spectral variables and band variables selected from the spectral reflectance of a HJ-HSI satellite image taken in the same period. The results showed that: 1) The spectral reflectance of the grassland communities differed among plots during different seasons, and their reflectance was ordered as W2 > N > W1 in spring, W2 > W1 > N in summer, and W1 > W2 > N in autumn; 2) HJ-HSI can be used to estimate the aboveground biomass of this kind of grassland, and the results of the estimation models vary among different community types and seasons. The estimates obtained by the models for the spring, summer, and autumn were as follows: DVI, NDVI, 620.225-627.895 nm reflectance average construction in plot N; Rn, 656.305 and 776.8199 nm reflectance normalised values, MSAVI construction in W1; 652.09 and 732.01 nm reflectance normalised values, Rr, 584.52-598.295 nm average construction in plot W2.