Application of remote sensing on the turf management of bermudagrass
Date Issued
2006
Date
2006
Author(s)
Chen, Hung-Ming
DOI
zh-TW
Abstract
The object of this study was conducted to examine the content of pigments in the leaves and canopy reflectance spectrum of bermudagrass (Cynodon spp.) Tifway 419 with different nitrogen rate and mowing frequency. The thermo imaging technique was used to monitoring the weeds in turfgrass, and the grey theory was applied to analyze the effect of climate factors on the satellite remote sensing normalized difference vegetation index (NDVI) of turfgrass. The main results were summarized as follows:
1.The contents of chlorophyll (Chl), and its biosynthetic and degradative intermediates (total porphyrin; chlorophyllide, Chlide; pheophytin, Phe; phytylated and dephytylated pigments), and carotenoids in the leaves of bermudagrass Tifway 419 elevated with increasing nitrogen rate. The mole percent of three porphyrins (protoporphyrin, PPIX; magnesium protoporphyrin IX, MGPP; protochlorophyllide, Pchlide) were not obvious to be influenced by nitrogen rate.
2.The canopy reflectance spectra of bermudagrass Tifway 419 were measured. The reflectance between 400-700 nm was very low, while near-infrared (NIR) band above 750 nm was very high. The reflectance in the near-infrared spectra was increased with increasing nitrogen rate, but the reflectance in the visible spectra was decreased as nitrogen rate increases. NDVI680, NDVI705 and NDVIbroad calculated using broad-band reflectance were correlated well with the contents of Chl a, Chl b and Car (correlation R2 were all about 0.7, p<0.01).
3.The NDVI of SPOT remote sensing data for fairway turfgrass of Taichung International Golf Course were presented seasonal change. It was between 0.1-0.5 in the whole year. NDVI was the lowest in February and March, increased after April, and reached the highest 0.5 in August and September of summer, then decreased in autumn and winter season.
4.The grey system theory was applied to pinpoint the effect of five climate factors on the satellite remote sensing NDVI of zoysiagrass (Zoysia spp.) and bermudagrass Tifway 419. The contribution degrees of climate factors, indicated by grey order, to satellite remote sensing NDVI of zoysiagrass and bermudagrass Tifway 419 were: monthly mean temperature＞daily cumulative irradiance＞monthly mean relative humidity＞daily insolation percentage＞monthly cumulative precipitation. The data further suggest that sunlight-related factors (SRFs) play more important role in satellite remote sensing NDVI of zoysiagrass and bermudagrass Tifway 419 than water-related factors (WRFs).
5.The themography was used to monitoring the weeds in bermudagrass turf. The temperature of bermudagrass Tifway 419 was higher 3-4 °C than that of crabgrass (Digitaria sanguinalis L.), purple nutsedge (Cyperus rotundus L.), knotgrass (Paspalum distichum L.) and chinese crabgrass (Digitaria radicosa Presl.). The reflectance spectra in visible and near infrared of chinese crabgrass was higher than that of bermudagrass Tifway 419.
Subjects
遙感探測
百慕達草
草坪管理
色素
反射光譜
植生指數
熱影像
灰關聯分析
remote sensing
bermudagrass
turf management
pigment
reflectance spectrum
vegetation index
thermography
grey relational analysis
Type
thesis
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