東華大學圖書館 |

語系: 繁體中文

說明(常見問題)

回圖書館首頁

手機版館藏查詢

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

Investigating Dew Deposition on Leav...

Gerlein-Safdi, Cynthia.

FindBook

Google Book

Amazon

博客來

Investigating Dew Deposition on Leaves: Effects on Leaf Water Content, CO2, and Remote Sensing Characterization.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Investigating Dew Deposition on Leaves: Effects on Leaf Water Content, CO2, and Remote Sensing Characterization./
作者:	Gerlein-Safdi, Cynthia.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2017,
面頁冊數:	165 p.
附註:	Source: Dissertation Abstracts International, Volume: 79-05(E), Section: B.
Contained By:	Dissertation Abstracts International79-05B(E).
標題:	Environmental engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10634254
ISBN:	9780355480214

Investigating Dew Deposition on Leaves: Effects on Leaf Water Content, CO2, and Remote Sensing Characterization.
Gerlein-Safdi, Cynthia.

Investigating Dew Deposition on Leaves: Effects on Leaf Water Content, CO2, and Remote Sensing Characterization. - Ann Arbor : ProQuest Dissertations & Theses, 2017 - 165 p.

Source: Dissertation Abstracts International, Volume: 79-05(E), Section: B.

Thesis (Ph.D.)--Princeton University, 2017.

Dew deposition occurs in ecosystems worldwide, even in the driest deserts and in times of drought. Although some species absorb dew water directly via foliar up- take, a ubiquitous effect of dew on plant water balance is the interference of dew droplets with the leaf energy balance, which increases leaf albedo and emissivity and decreases leaf temperature through dew evaporation. Dew deposition frequency and amount are expected to be affected by changing environmental conditions, with un- known consequences for plant water stress and ecosystem carbon, water, and energy fluxes. In this dissertation, I seek to quantify the effect of dew deposition on leaves as well as the spatial extent of dew deposition, to provide an estimate of the effects of dew on water and carbon exchanges between vegetation and the atmosphere. In Chapter 2, I present a new protocol using a Picarro induction module coupled to a cavity ringdown spectrometer to obtain maps of the leaf water isotopes 18O and 2H. The technique is applied to Colocasia esculenta leaves, and I find that these leaves present a unique pattern of intra-leaf water isotopes with a strong radial enrichment and little longitudinal enrichment. In Chapter 3, I use the new method presented in Chapter 2 to study the effects of dew deposition on the water isotopes and water potential of C. esculenta. I discover that dew does not penetrate inside the leaves, but does impact their transpiration rate, helping them maintain a higher water potential. To better understand these results, I develop a dew deposition and leaf water, energy, and carbon balance model presented in Chapter 4. The model is compared to leaf wetness sensor data from the Blue Oak Ranch Reserve in California, and I find that dew deposition usually decreases both transpiration and carbon uptake. I conclude this dissertation by investigating the spatial extent of dew deposition events, which is currently largely unknown, by modeling the effects of dew droplets on leaves in active microwave remote sensing data.

ISBN: 9780355480214Subjects--Topical Terms:

548583
Environmental engineering.

Investigating Dew Deposition on Leaves: Effects on Leaf Water Content, CO2, and Remote Sensing Characterization.
LDR:03048nmm a2200313 4500 001 2154817
005 20180419121557.5
008 190424s2017 ||||||||||||||||| ||eng d
020 $a 9780355480214
035 $a (MiAaPQ)AAI10634254
035 $a (MiAaPQ)princeton:12336
035 $a AAI10634254
040 $a MiAaPQ $c MiAaPQ
100 1 $a Gerlein-Safdi, Cynthia. $3 3342547
245 1 0 $a Investigating Dew Deposition on Leaves: Effects on Leaf Water Content, CO2, and Remote Sensing Characterization.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2017
300 $a 165 p.
500 $a Source: Dissertation Abstracts International, Volume: 79-05(E), Section: B.
500 $a Adviser: Kelly K. Caylor.
502 $a Thesis (Ph.D.)--Princeton University, 2017.
520 $a Dew deposition occurs in ecosystems worldwide, even in the driest deserts and in times of drought. Although some species absorb dew water directly via foliar up- take, a ubiquitous effect of dew on plant water balance is the interference of dew droplets with the leaf energy balance, which increases leaf albedo and emissivity and decreases leaf temperature through dew evaporation. Dew deposition frequency and amount are expected to be affected by changing environmental conditions, with un- known consequences for plant water stress and ecosystem carbon, water, and energy fluxes. In this dissertation, I seek to quantify the effect of dew deposition on leaves as well as the spatial extent of dew deposition, to provide an estimate of the effects of dew on water and carbon exchanges between vegetation and the atmosphere. In Chapter 2, I present a new protocol using a Picarro induction module coupled to a cavity ringdown spectrometer to obtain maps of the leaf water isotopes 18O and 2H. The technique is applied to Colocasia esculenta leaves, and I find that these leaves present a unique pattern of intra-leaf water isotopes with a strong radial enrichment and little longitudinal enrichment. In Chapter 3, I use the new method presented in Chapter 2 to study the effects of dew deposition on the water isotopes and water potential of C. esculenta. I discover that dew does not penetrate inside the leaves, but does impact their transpiration rate, helping them maintain a higher water potential. To better understand these results, I develop a dew deposition and leaf water, energy, and carbon balance model presented in Chapter 4. The model is compared to leaf wetness sensor data from the Blue Oak Ranch Reserve in California, and I find that dew deposition usually decreases both transpiration and carbon uptake. I conclude this dissertation by investigating the spatial extent of dew deposition events, which is currently largely unknown, by modeling the effects of dew droplets on leaves in active microwave remote sensing data.
590 $a School code: 0181.
650 4 $a Environmental engineering. $3 548583
650 4 $a Water resources management. $3 794747
650 4 $a Plant sciences. $3 3173832
690 $a 0775
690 $a 0595
690 $a 0479
710 2 $a Princeton University. $b Civil and Environmental Engineering. $3 2095365
773 0 $t Dissertation Abstracts International $g 79-05B(E).
790 $a 0181
791 $a Ph.D.
792 $a 2017
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10634254