基于HJ-HSI数据的伊犁绢蒿荒漠草地生物量估测

发布时间：2018-12-29 09:33

【摘要】：以地面实测数据为依据,通过获取其同步HJ-HSI影像光谱反射率,筛选出光谱变量、波段变量,对不同利用状态的退化伊犁绢蒿(Seriphidium transiliense)荒漠草地(围栏封育区N,围栏外重度退化区W_1,围栏外中度退化区W_2)的地上生物量进行估测。结果表明,1)各季节不同利用状态伊犁绢蒿荒漠草地群落HJ-HSI光谱反射率不同,春季为W_2NW_1,夏季为W_2W_1N,秋季为W_1W_2N;2)HJ-HSI可以实现对伊犁绢蒿荒漠草地地上生物量的估测,估测模型因群落类型和季节不同而存在差异。春、夏、秋3个季节的估测模型,N分别由DVI、NDVI、620.225-627.895nm反射率平均值所构建,W_1分别由近红外波段(Rn)、656.305nm和776.8199nm反射率归一化值、MSAVI构建,W_2分别由652.09和732.01nm反射率归一化值、红外波段(Rr)、584.52-598.295nm反射率平均值构建。
[Abstract]:Based on the ground measured data, spectral reflectance of synchronous HJ-HSI images was obtained, and spectral variables and band variables were screened out. The degraded (Seriphidium transiliense) desert grassland (fenced off area N) with different utilization states was studied. The aboveground biomass of severe degraded area W1 outside the fence and Wai 2 of medium degraded area outside the fence was estimated. The results showed that: 1) the spectral reflectance of HJ-HSI was different in different seasons, W2NW1 in spring, W2W1N in summer and W1W2Ns in autumn; 2) HJ-HSI could be used to estimate the aboveground biomass of the desert grassland of Artemisia yili, and the estimation model was different according to the community type and season. The estimation models of spring, summer and autumn were constructed by the average reflectivity of DVI,NDVI,620.225-627.895nm and the normalized reflectivity of (Rn), 656.305nm and 776.8199nm in the near infrared band, respectively, and MSAVI, respectively. W _ s _ 2 is constructed from normalized values of 652.09 and 732.01nm reflectivity and average reflectivity of (Rr), 584.52-598.295nm in infrared band respectively.
【作者单位】：新疆农业大学草业与环境科学学院新疆草地资源与生态重点实验室;
【基金】：国家自然科学基金(31360571)
【分类号】：S812

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