Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/S0034-4257(00)00119-X |
Measuring fractional cover and leaf area index in arid ecosystems: Digital camera, radiation transmittance, and laser altimetry methods | |
White, MA; Asner, GP; Nemani, RR; Privette, JL; Running, SW | |
通讯作者 | White, MA |
来源期刊 | REMOTE SENSING OF ENVIRONMENT
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ISSN | 0034-4257 |
出版年 | 2000 |
卷号 | 74期号:1页码:45-57 |
英文摘要 | Field measurement of shrubland ecological properties is important for both site monitoring and validation of remote sensing information. During the May 1997 NASA Earth Observing System Jornada Prototype Validation Exercise, we calculated plot-level plant area index leaf area index, total fractional cover, and green fractional cover with data from four instruments: (1) a Dycam Agricultural Digital Camera (ADC), (2) a LI-COR LAI-2000 plant canopy analyser, (3) a Decagon sunfleck Ceptometer, and (4) a laser altimeter. Estimates from the LAI-2000 and Ceptometer were very similar (plant area index 0.3, leaf area index 0.22, total fractional cover 0.19, green fractional cover 0.14), while the ADC produced values 5% to 10% higher. Laser altimeter values, depending on the height cutoff used to establish total fractional cover were either higher or lower than the other instruments’ values: a 10-cm cutoff produced values similar to 80% higher, while a 20-cm cutoff produced values similar to 30% lower The LAI-2000 and Ceptometer are designed to operate in hamogenons canopies, not the sparse and irregular vegetation found at Jornada. Thus, these instruments were primarily useful for relative within-site plant area index monitoring. Calculation of some parameters required destructive sampling, a relatively slow and labor-intensive activity that limits spatial and temporal applicability. Validation/monitoring campaigns therefore should be guided by consideration of the amount of time and resources required to obtain measurements of the desired variables. Our results suggest that the ADC is both efficient and accurate for long-term or large-scale monitoring of arid ecosystems. (C) Elsevier Science Inc., 2000. |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000089448300004 |
WOS关键词 | SPECTRAL VEGETATION INDEXES ; PLANT CANOPY ANALYZER ; LI-COR LAI-2000 ; PINE STANDS ; RAPID ESTIMATION ; NEW-MEXICO ; FORESTS ; DESERTIFICATION ; SENSITIVITY ; RANGELAND |
WOS类目 | Environmental Sciences ; Remote Sensing ; Imaging Science & Photographic Technology |
WOS研究方向 | Environmental Sciences & Ecology ; Remote Sensing ; Imaging Science & Photographic Technology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/139918 |
作者单位 | (1)Univ Montana, Sch Forestry, NTSG, Missoula, MT 59812 USA;(2)Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA;(3)NASA, Goddard Space Flight Ctr, Biospher Sci Branch, Greenbelt, MD 20771 USA |
推荐引用方式 GB/T 7714 | White, MA,Asner, GP,Nemani, RR,et al. Measuring fractional cover and leaf area index in arid ecosystems: Digital camera, radiation transmittance, and laser altimetry methods[J],2000,74(1):45-57. |
APA | White, MA,Asner, GP,Nemani, RR,Privette, JL,&Running, SW.(2000).Measuring fractional cover and leaf area index in arid ecosystems: Digital camera, radiation transmittance, and laser altimetry methods.REMOTE SENSING OF ENVIRONMENT,74(1),45-57. |
MLA | White, MA,et al."Measuring fractional cover and leaf area index in arid ecosystems: Digital camera, radiation transmittance, and laser altimetry methods".REMOTE SENSING OF ENVIRONMENT 74.1(2000):45-57. |
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