Abstract：
:Spectral reflectance values of four canopy components (stems, buds, opening flowers, and postflowers of yellow starthistle (Centaurea solstitialis)) were measured to describe their spectral characteristics. We then physically combined these canopy components to simulate the flowering stage indicated by accumulated flower ratios (AFR) 10%, 40%, 70%, and 90%, respectively. Spectral dissimilarity and spectral angles were calculated to quantitatively identify spectral differences among canopy components and characteristic patterns of these flowering stages. This study demonstrated the ability of hyperspectral data to characterize canopy components, and identify different flowering stages. Stems had a typical spectral profile of green vegetation, which produced a spectral dissimilarity with three reproduction organs (buds, opening flowers, and postflowers). Quantitative differences between simulated flower stages depended on spectral regions and phenological stages examined. Using full-range canopy spectra, the initial flowering stage could be separated from the early peak, peak, and late flowering stages by three spectral regions, i.e. the blue absorption (around 480 nm) and red absorption (around 650 nm) regions and NIR plateau from 730 nm to 950 nm. For airborne CASI data, only the red absorption region and NIR plateau could be used to identify the flowering stages in the field. This study also revealed that the peak flowering stage was more easily recognized than any of the other three stages.
journal_name
Environ Monit Assessjournal_title
Environmental monitoring and assessmentauthors
Ge S,Everitt J,Carruthers R,Gong P,Anderson Gdoi
10.1007/s10661-005-9052-1subject
Has Abstractpub_date
2006-09-01 00:00:00pages
109-26issue
1-3eissn
0167-6369issn
1573-2959journal_volume
120pub_type
杂志文章abstract：:In this paper limnological status of river Suswa was observed for a period of two years. A water quality Beck modified Khanna Bhutiani model (BMKB model) was developed to calculate DO (dissolved Oxygen) and BOD (biochemical oxygen demand). The model was developed to calculate DO and BOD by using DO/BOD of same place a...
journal_title：Environmental monitoring and assessment
pub_type： 杂志文章
doi：10.1007/s10661-006-9251-4
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journal_title：Environmental monitoring and assessment
pub_type： 杂志文章
doi：10.1007/s10661-015-4403-z
更新日期：2015-05-01 00:00:00
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journal_title：Environmental monitoring and assessment
pub_type： 杂志文章
doi：10.1007/s10661-008-0666-y
更新日期：2010-01-01 00:00:00
abstract：:Seed germination is considered a critical phase in plant development and relatively sensitive to heavy metals. White poplar (Populus alba) trees tend to accumulate Cd and Zn in their tissues. We tested if soil contamination can affect P. alba progeny, reduced seed germination and explored the distribution of mineral e...
journal_title：Environmental monitoring and assessment
pub_type： 杂志文章
doi：10.1007/s10661-015-4893-8
更新日期：2015-11-01 00:00:00
abstract：:This paper estimates Malaysian farmers' willingness to pay (WTP) for a planned adaptation programme for addressing climate issues in the Malaysian agricultural sector. We used the contingent valuation method (CVM) for a monetary valuation of farmers' preferences for a planned adaptation programme by ascertaining the v...
journal_title：Environmental monitoring and assessment
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journal_title：Environmental monitoring and assessment
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journal_title：Environmental monitoring and assessment
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更新日期：2016-08-01 00:00:00
abstract：:Given its geographic characteristics, the southern Chilean fjord area is subjected to growing environmental pressure from the development of diverse forms of aquaculture (i.e., fish, algae, shellfish). The sediments accumulate substances as a natural sink, and ecotoxicology assays offer a reliable and robust proxy for...
journal_title：Environmental monitoring and assessment
pub_type： 杂志文章
doi：10.1007/s10661-008-0444-x
更新日期：2009-08-01 00:00:00
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journal_title：Environmental monitoring and assessment
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更新日期：2009-12-01 00:00:00
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更新日期：2009-02-01 00:00:00
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doi：10.1023/b:emas.0000009232.18889.37
更新日期：2004-02-01 00:00:00
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journal_title：Environmental monitoring and assessment
pub_type： 杂志文章
doi：10.1007/s10661-019-7917-y
更新日期：2019-11-26 00:00:00
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journal_title：Environmental monitoring and assessment
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更新日期：2017-11-21 00:00:00
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journal_title：Environmental monitoring and assessment
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doi：10.1007/s10661-005-4437-8
更新日期：2005-06-01 00:00:00
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journal_title：Environmental monitoring and assessment
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doi：10.1007/s10661-015-4597-0
更新日期：2015-06-01 00:00:00
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journal_title：Environmental monitoring and assessment
pub_type： 杂志文章
doi：10.1007/s10661-013-3316-y
更新日期：2013-12-01 00:00:00
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journal_title：Environmental monitoring and assessment
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doi：10.1007/s10661-017-5939-x
更新日期：2017-05-01 00:00:00
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journal_title：Environmental monitoring and assessment
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doi：10.1007/s10661-019-7646-2
更新日期：2019-07-24 00:00:00
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journal_title：Environmental monitoring and assessment
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更新日期：2002-05-01 00:00:00
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journal_title：Environmental monitoring and assessment
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更新日期：2020-09-01 00:00:00
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journal_title：Environmental monitoring and assessment
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更新日期：2012-09-01 00:00:00
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journal_title：Environmental monitoring and assessment
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journal_title：Environmental monitoring and assessment
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更新日期：2018-06-11 00:00:00
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journal_title：Environmental monitoring and assessment
pub_type： 杂志文章
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更新日期：1996-05-01 00:00:00
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journal_title：Environmental monitoring and assessment
pub_type： 杂志文章
doi：10.1007/s10661-006-1488-4
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