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

Isotopic evidence for the climate de...

Houlton, Benjamin Zind.

FindBook

Google Book

Amazon

博客來

Isotopic evidence for the climate dependence of nitrogen cycles across old tropical rainforests, Mt. Haleakala, Hawaii.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Isotopic evidence for the climate dependence of nitrogen cycles across old tropical rainforests, Mt. Haleakala, Hawaii./
作者:	Houlton, Benjamin Zind.
面頁冊數:	166 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1264.
Contained By:	Dissertation Abstracts International66-03B.
標題:	Biology, Ecology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3169804
ISBN:	9780542059841

Isotopic evidence for the climate dependence of nitrogen cycles across old tropical rainforests, Mt. Haleakala, Hawaii.
Houlton, Benjamin Zind.

Isotopic evidence for the climate dependence of nitrogen cycles across old tropical rainforests, Mt. Haleakala, Hawaii. - 166 p.

Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1264.

Thesis (Ph.D.)--Princeton University, 2005.

This dissertation explores the origin of the climate-dependence of nitrogen (N) cycles across old tropical rainforests. Here, I adopt a model system approach to this problem, by taking advantage of six sites positioned within the influence of sharp rain shadow on Mt. Haleakala, Hawaii, which roughly span the rainfall regimes observed for tropical forests worldwide. I mix empirical measures with quantitative modeling to deconvolve the mechanisms that underpin a monotonic decrease in the N isotope abundance (15N/14N) of forested ecosystems with increasing rainfall. In chapter 1, I provide a brief introduction to the questions addressed and give an overview of the dissertation chapters. In chapter 2, I report on 15N/ 14N input-output budgets across the Hawaiian rainfall gradient. Results of this work highlight the importance of gaseous N losses in controlling ecosystem 15N-signatures, the amount of N available for plant growth, and the scale-dependence of isotopic expression of N cycling reactions within the rainforests. In chapter 3, I examine strategies of plant N acquisition across the rainforests, by exploiting natural variations in the 15N/ 14N of foliage and ecosystem N pools. Here, I report that plants rely on nitrate for growth in dry forests, but ammonium in the wettest ones, and that this transition is strongly influenced by microbial N consumption in the soil. Finally, in chapter 4, I explore how spatial complexity influences the vertical distribution of N in soil subsystems, and provide strong isotopic and modeling evidence that the N cycle is depth-stratified within the sites. Most broadly, my findings bring much needed resolution on controls of the climate-dependence of ecosystem 15N-signatures across tropical rainforests, with implications for understanding N balances, N limitation, and organismal responses to shifts in forest N availability across tropical rainfall climates.

ISBN: 9780542059841Subjects--Topical Terms:

1017726
Biology, Ecology.

Isotopic evidence for the climate dependence of nitrogen cycles across old tropical rainforests, Mt. Haleakala, Hawaii.
LDR:02867nmm 2200289 4500 001 1823428
005 20061130142444.5
008 130610s2005 eng d
020 $a 9780542059841
035 $a (UnM)AAI3169804
035 $a AAI3169804
040 $a UnM $c UnM
100 1 $a Houlton, Benjamin Zind. $3 1912536
245 1 0 $a Isotopic evidence for the climate dependence of nitrogen cycles across old tropical rainforests, Mt. Haleakala, Hawaii.
300 $a 166 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1264.
500 $a Adviser: Lars W. Hedin.
502 $a Thesis (Ph.D.)--Princeton University, 2005.
520 $a This dissertation explores the origin of the climate-dependence of nitrogen (N) cycles across old tropical rainforests. Here, I adopt a model system approach to this problem, by taking advantage of six sites positioned within the influence of sharp rain shadow on Mt. Haleakala, Hawaii, which roughly span the rainfall regimes observed for tropical forests worldwide. I mix empirical measures with quantitative modeling to deconvolve the mechanisms that underpin a monotonic decrease in the N isotope abundance (15N/14N) of forested ecosystems with increasing rainfall. In chapter 1, I provide a brief introduction to the questions addressed and give an overview of the dissertation chapters. In chapter 2, I report on 15N/ 14N input-output budgets across the Hawaiian rainfall gradient. Results of this work highlight the importance of gaseous N losses in controlling ecosystem 15N-signatures, the amount of N available for plant growth, and the scale-dependence of isotopic expression of N cycling reactions within the rainforests. In chapter 3, I examine strategies of plant N acquisition across the rainforests, by exploiting natural variations in the 15N/ 14N of foliage and ecosystem N pools. Here, I report that plants rely on nitrate for growth in dry forests, but ammonium in the wettest ones, and that this transition is strongly influenced by microbial N consumption in the soil. Finally, in chapter 4, I explore how spatial complexity influences the vertical distribution of N in soil subsystems, and provide strong isotopic and modeling evidence that the N cycle is depth-stratified within the sites. Most broadly, my findings bring much needed resolution on controls of the climate-dependence of ecosystem 15N-signatures across tropical rainforests, with implications for understanding N balances, N limitation, and organismal responses to shifts in forest N availability across tropical rainfall climates.
590 $a School code: 0181.
650 4 $a Biology, Ecology. $3 1017726
650 4 $a Biogeochemistry. $3 545717
650 4 $a Environmental Sciences. $3 676987
690 $a 0329
690 $a 0425
690 $a 0768
710 2 0 $a Princeton University. $3 645579
773 0 $t Dissertation Abstracts International $g 66-03B.
790 1 0 $a Hedin, Lars W., $e advisor
790 $a 0181
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3169804