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| 1 | Effects of slope gradient on runoff from bare-fallow purple soil in China under natural rainfall conditions显示文摘Purple soil is highly susceptible for overland flow and surface erosion, therefore understanding surface runoff and soil erosion processes in the purple soil region are important to mitigate flooding and erosion hazards. Slope angle is an important parameter that affects the magnitude of runoff and thus surface erosion in hilly landscapes or bare land area. However, the effect of slope on runoff generation remains unclear in many different soils including Chinese purple soil. The aim of this study was to investigate the relationship between different slope gradients and surface runoff for bare-fallow purple soil, using 5 m × 1.5 m experimental plots under natural rainfall conditions. Four experimental plots(10°, 16°, 20° and 26°) were established in theYanting Agro-ecological Experimental Station of Chinese Academy of Science in central Sichuan Basin. The plot was equipped with water storage tank to monitor water level change. Field monitoring from July 1 to October 31, 2012 observed 42 rainfall events which produced surface runoff from the experimental plots. These water level changes were converted to runoff. The representative eight rainfall events were selected for further analysis, the relationship between slope and runoff coefficient were determined using ANOVA, F-test, and z-score analysis. The results indicated a strong correlation between rainfall and runoff in cumulative amount basis. The mean value of the measured runoff coefficient for four experimental plots was around 0.1. However, no statistically significant relationship was found between slope and runoff coefficient. We reviewed the relationship between slope and runoff in many previous studiesand calculated z-score to compare with our experimental results. The results of z-score analysis indicated that both positive and negative effects of slope on runoff coefficient were obtained, however a moderate gradient(16°-20° in this study) could be a threshold of runoff generation for many different soils including the Chinese purple soil. | KOMATSU Yoshitaka KATO Hiroaki ZHU Bo WANG Tao YANG Fan RAKWAL Randeep ONDA Yuichi | 2018 | Journal of Mountain Science2018，15，4： | 7 |
| 2 | An experimental study on the burrowing activity of river crabs on subsurface water movement and piping erosion 显示文摘 | Yuichi Onda Naoko Itakura | 1997 | Geomorphology1997，，20： | 1 |
| 3 | The relationship of soil organic carbon to 210Pbex and 137Cs during surface soil erosion in a hillslope forested environment显示文摘 | Mengistu T Teramage Yuichi Onda Hiroaki Kato | 2013 | Geoderma2013，192，： | 1 |
| 4 | Plot-scale study of surface runoff on well-covered forest floors under different canopy species显示文摘 | Jin Kwan Kim Yuichi Onda Min Seok Kim Dong Yoon Yang | 2014 | Quaternary International2014，，： | 1 |
| 5 | Identification of histological markers for malignant glioma by genome-wide expression analysis: dynein, α-PIX and sorcin显示文摘 | Takashi Yokota Jun Kouno Koji Adachi Hiroshi Takahashi Akira Teramoto Koshi Matsumoto Yuichi Sugisaki Masamitsu Onda Tatsuhiko Tsunoda | 2006 | Acta Neuropathologica2006，，1： | 1 |
| 6 | Characterization of diffuse pollutions from forested watersheds in Japan during storm events -Its association with rainfall and watershed features显示文摘 | Zhao Zhang Takehiko Fukushima Yuichi Onda | 2008 | Science of the Total Environment2008，390，1： | 1 |
| 7 | Spatial variability of throughfall under a single tree: Experimental study of rainfall amount, raindrops, and kinetic energy显示文摘 | Kazuki Nanko Yuichi Onda Akane Ito Hiromu Moriwaki | 2011 | Agricultural and Forest Meteorology2011，，9： | 1 |
| 8 | Distribution of cesium-137 in Japanese forest soils:Correlation with the contents of organic carbon显示文摘 | Chisto Takenaka Yuichi Onda Yasunori Hamajima | 1998 | The Science of the Total Environmental1998，222，： | 1 |
| 9 | ALL JPY1,800以下!热衷于美容的2位在关注什么呢?? NiCo Erica的平价化妆品推荐显示文摘大爱美妆的Nicole&Erica关于平价彩妆的个人分享?从2人挚爱的平价化妆品,到如何使用平价彩妆化妆。ALL JPY1,800以下的绝对要买的单品,不要错过哦。?Nico Erica最爱的平价化妆品now.首先,了解2人真实心水的物品?以此展开平价好用的单品。很偶然的,粉饼、眼线笔和睫毛膏都上榜了! | Yuichi Iwaya Makoto Muto Ryoichi Onda | 2019 | 美眉2019，0，6： | 0 |
| 10 | A tree detection method based on trunk point cloud section in dense plantation forest using drone Li DAR data显示文摘Single-tree detection is one of the main research topics in quantifying the structural properties of forests. Drone Li DAR systems and terrestrial laser scanning systems produce high-density point clouds that offer great promise for forest inventories in limited areas. However, most studies have focused on the upper canopy layer and neglected the lower forest structure. This paper describes an innovative tree detection method using drone Li DAR data from a new perspective of the under-canopy structure. This method relies on trunk point clouds, with undercanopy sections split into heights ranging from 1 to 7 m, which were processed and compared, to determine a suitable height threshold to detect trees. The method was tested in a dense cedar plantation forest in the Aichi Prefecture, Japan, which has a stem density of 1140 stems·ha^(-1) and an average tree age of 42 years. Dense point cloud data were generated from the drone Li DAR system and terrestrial laser scanning with an average point density of 5000 and 6500 points·m^(-2), respectively. Tree detection was achieved by drawing point-cloud section projections of tree trunks at different heights and calculating the center coordinates. The results show that this trunk-section-based method significantly reduces the difficulty of tree detection in dense plantation forests with high accuracy(F1-Score=0.9395). This method can be extended to different forest scenarios or conditions by changing section parameters. | Yupan Zhang Yiliu Tan Yuichi Onda Asahi Hashimoto Takashi Gomi Chenwei Chiu Shodai Inokoshi | 2023 | Forest Ecosystems2023，10，1： | 0 |
| 11 | Effect of forest thinning on hydrologic nitrate exports from a Nsaturated plantation显示文摘Although several studies have assessed the effects of thinning on water quality,including nitrogen(N)exports,few have examined N-saturated plantations.This study assessed the short-term effect of thinning on N exports from a N-saturated plantation forest in northern Kyushu,western Japan,that was thinned(43%of basal area)during January-March 2012.Water levels at the gauging station were continually measured,and streamwater baseflow and stormflow samples were collected before(2011)and after(2013)forest thinning.Annual precipitation before(2469 mm)and after(2418 mm)forest thinning differed little,and annual water discharge after thinning(1641 mm)was similar to that before thinning(1609 mm).However,direct flow during stormflow periods was higher after thinning(260 mm)than before(153 mm).The concentrations of major ions in stream water did not differ before and after thinning.As a result,the high annual dissolved inorganic N(DIN)exports differed little before(35.8 kg N ha^-1 a^-1)and after(36.5 kg N ha^-1 a^-1)forest thinning.DIN exports during stormflow periods were slightly higher after(12.2 kg N ha^-1 a^-1)than before thinning(10.5 kg N ha^-1 a^-1)and were proportional to the increased direct flow after thinning(561 mm after vs.470 mm before thinning).We concluded that thinning does not affect annual N exports from the N-saturated plantation forest,but it can increase the proportion of N exported during stormflow periods in proportion to increased water volume of direct flow after thinning. | Masaaki Chiwa Hirokazu Haga Tamao Kasahara Makiko Tateishi Takami Saito Hiroaki Kato Kyoichi Otsuki Yuichi Onda | 2020 | Journal of Forestry Research2020，31，2： | 0 |
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