奈曼旗玉米残茬覆盖度计算方法及其对土壤风蚀量计算的影响

王飞翔, 甄天乐, 李继峰, 李慧茹, 郭中领, 常春平, 张夏蕾, 于凯昕

Calculation method of maize residue coverage in Naiman Banner and its influence on the calculation of soil wind erosion rate

Feixiang Wang, Tianle Zhen, Jifeng Li, Huiru Li, Zhongling Guo, Chunping Chang, Xialei Zhang, Kaixin Yu

表1 不同光谱指数及计算公式

Table 1 Different maize spectral indices and calculation formulas

光谱指数	简称	计算公式
归一化差值指数^[26]	NDI₁	$N D V_{1} = \frac{λ_{i} - λ_{j}}{λ_{i} + λ_{j}}$
比值指数^[27]	RI	$R I = \frac{λ_{i}}{λ_{j}}$
归一化木质素指数^[28]	NDI₂	$N L D_{2} = \frac{l g \frac{1}{λ_{i}} - l g \frac{1}{λ_{j}}}{l g \frac{1}{λ_{i}} + l g \frac{1}{λ_{j}}}$
干枯燃料指数^[29]	DFI	$D F I = 100 \times (1 - λ_{i} / λ_{j}) / λ_{k}$
纤维素吸收指数^[30]	CAI	$C A I = 0.5 \times (λ_{i} + λ_{j}) - λ_{k}$