scholarly journals Restoration of pine forests with pine wilt disease by removal of understory and A0 horizon on the forest floor.

2004 ◽  
Vol 30 (1) ◽  
pp. 110-115 ◽  
Author(s):  
Keiji SAKAMOTO ◽  
Akihiko ISHII ◽  
Takashi NISHIMOTO ◽  
Naoko MIKI ◽  
Ken YOSHIKAWA
2003 ◽  
Vol 8 (4) ◽  
pp. 303-309 ◽  
Author(s):  
Keiji Sakamoto ◽  
Naoko Miki ◽  
Taiyo Tsuzuki ◽  
Takashi Nishimoto ◽  
Ken Yoshikawa

2008 ◽  
Vol 10 (1) ◽  
pp. 1-8
Author(s):  
Hai-wei Wu ◽  
You-qing Luo ◽  
Juan Shi ◽  
Xiao-su Yan ◽  
Wei-ping Chen ◽  
...  

2005 ◽  
Vol 40 (4) ◽  
pp. 563-574 ◽  
Author(s):  
Tae-Sung Kwon ◽  
Mi-Young Song ◽  
Sang-Chul Shin ◽  
Young-Seuk Park

Author(s):  
Süleyman Akbulut ◽  
Beşir Yüksel ◽  
Ismail Baysal ◽  
Paulo Vieira ◽  
Manuel Mota

1988 ◽  
Vol 54 (5) ◽  
pp. 606-615 ◽  
Author(s):  
Keiko KURODA ◽  
Toshihiro YAMADA ◽  
Kazuhiko MINEO ◽  
Hirotada TAMURA

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Run Yu ◽  
Lili Ren ◽  
Youqing Luo

Abstract Background Pine wilt disease (PWD) is a major ecological concern in China that has caused severe damage to millions of Chinese pines (Pinus tabulaeformis). To control the spread of PWD, it is necessary to develop an effective approach to detect its presence in the early stage of infection. One potential solution is the use of Unmanned Airborne Vehicle (UAV) based hyperspectral images (HIs). UAV-based HIs have high spatial and spectral resolution and can gather data rapidly, potentially enabling the effective monitoring of large forests. Despite this, few studies examine the feasibility of HI data use in assessing the stage and severity of PWD infection in Chinese pine. Method To fill this gap, we used a Random Forest (RF) algorithm to estimate the stage of PWD infection of trees sampled using UAV-based HI data and ground-based data (data directly collected from trees in the field). We compared relative accuracy of each of these data collection methods. We built our RF model using vegetation indices (VIs), red edge parameters (REPs), moisture indices (MIs), and their combination. Results We report several key results. For ground data, the model that combined all parameters (OA: 80.17%, Kappa: 0.73) performed better than VIs (OA: 75.21%, Kappa: 0.66), REPs (OA: 79.34%, Kappa: 0.67), and MIs (OA: 74.38%, Kappa: 0.65) in predicting the PWD stage of individual pine tree infection. REPs had the highest accuracy (OA: 80.33%, Kappa: 0.58) in distinguishing trees at the early stage of PWD from healthy trees. UAV-based HI data yielded similar results: the model combined VIs, REPs and MIs (OA: 74.38%, Kappa: 0.66) exhibited the highest accuracy in estimating the PWD stage of sampled trees, and REPs performed best in distinguishing healthy trees from trees at early stage of PWD (OA: 71.67%, Kappa: 0.40). Conclusion Overall, our results confirm the validity of using HI data to identify pine trees infected with PWD in its early stage, although its accuracy must be improved before widespread use is practical. We also show UAV-based data PWD classifications are less accurate but comparable to those of ground-based data. We believe that these results can be used to improve preventative measures in the control of PWD.


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