Chinese Journal of Applied Ecology
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CHENG Di1, LIU Yong-mei1, LI Jing-zhong1, MO Chong-hui2
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Abstract: Stellera chamaejasme is one of the main poisonous weeds distributed in alpine meadow of Qinghai Province. Rapid spreading of S. chamaejasme has done serious harm to local animal husbandry and caused continuous grassland ecosystem degradation. This paper focused on the spectral differences between S. chamaejasme and herbage, taking the typical degraded alpine meadow dominated by S. chamaejasme in Qilian County of Haibei Region as the test site and using the spectral measurements acquired in the fullblossom period of S. chamaejasme from 2012 to 2014. The results showed that the spectral behavior of flowers of S. chamaejasme differed significantly from green background that included leaves of S. chamaejasme and herbage within 350-900 nm of VISNIR wavebands. The biggest reflectance difference between flowers of S. chamaejasme and green background was located in the red valley, followed by the blue valley. The reflectance of S. chamaejasme community increased with the rising of coverage, the biggest reflectance difference between S. chamaejasme and herbage communities lied in the nearinfrared peak, and the best separability between S. chamaejasme communities with different coverage was also at the point. The difference of first derivative spectra between flowers of S. chamaejasme and green background located in amplitude of yellow edge was remarkable, followed by amplitude of blue edge, the same as differences between S. chamaejasme and herbage communities. Linear regression analysis between coverage of S. chamaejasme and spectral feature parameters showed best result for red valley (R2=0.94). Finally, the red valley, the blue valley and the nearinfrared peak were proposed for discriminating S. chamaejasme from herbage in the fullblossom period of S. chamaejasme, and the combination of corresponding red, blue and nearinfrared bands could be used to build sensitive indices for S. chamaejasme recognition.
CHENG Di1, LIU Yong-mei1, LI Jing-zhong1, MO Chong-hui2. Extraction of spectral difference characteristics of Stellera chamaejasme in Qilian County of Qinghai Province, Northwest China.[J]. Chinese Journal of Applied Ecology.
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URL: https://www.cjae.net/EN/abstract/abstract11938.shtml
https://www.cjae.net/EN/Y2015/V26/I8/2307