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Controls on above and belowground ca...

Marin-Spiotta, Erika.

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Controls on above and belowground carbon storage during tropical reforestation.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Controls on above and belowground carbon storage during tropical reforestation./
作者:	Marin-Spiotta, Erika.
面頁冊數:	168 p.
附註:	Source: Dissertation Abstracts International, Volume: 68-02, Section: B, page: 0839.
Contained By:	Dissertation Abstracts International68-02B.
標題:	Biology, Ecology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3253977

Controls on above and belowground carbon storage during tropical reforestation.
Marin-Spiotta, Erika.

Controls on above and belowground carbon storage during tropical reforestation. - 168 p.

Source: Dissertation Abstracts International, Volume: 68-02, Section: B, page: 0839.

Thesis (Ph.D.)--University of California, Berkeley, 2006.

Reforestation of abandoned pasturelands provides opportunities for the recovery of forest ecosystem goods and services and for carbon (C) sequestration in plant biomass and soils. My research took advantage of a historical trend in natural reforestation of abandoned pasturelands in Puerto Rico to examine changes in above- and belowground C gain and loss over eight decades of tropical secondary succession. I sampled replicated chronosequences of primary forests, pastures, and secondary forests of different ages established on abandoned pastures. Rates of aboveground C sequestration peaked in the first two decades. Tree species composition in secondary forests remained distinct from that of primary forests, and this had a significant effect on aboveground biomass.Subjects--Topical Terms:

1017726
Biology, Ecology.

Controls on above and belowground carbon storage during tropical reforestation.
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245 1 0 $a Controls on above and belowground carbon storage during tropical reforestation.
300 $a 168 p.
500 $a Source: Dissertation Abstracts International, Volume: 68-02, Section: B, page: 0839.
500 $a Adviser: Whendee L. Silver.
502 $a Thesis (Ph.D.)--University of California, Berkeley, 2006.
520 $a Reforestation of abandoned pasturelands provides opportunities for the recovery of forest ecosystem goods and services and for carbon (C) sequestration in plant biomass and soils. My research took advantage of a historical trend in natural reforestation of abandoned pasturelands in Puerto Rico to examine changes in above- and belowground C gain and loss over eight decades of tropical secondary succession. I sampled replicated chronosequences of primary forests, pastures, and secondary forests of different ages established on abandoned pastures. Rates of aboveground C sequestration peaked in the first two decades. Tree species composition in secondary forests remained distinct from that of primary forests, and this had a significant effect on aboveground biomass.
520 $a Belowground C dynamics did not reflect the increase in aboveground C with reforestation. The gain in new, secondary forest-derived C was compensated for by the loss of residual pasture-derived C, resulting in no net change in the bulk soil C pool. Physical soil density fractions were sensitive to land-use change. The free, light fraction, representing physically unprotected C, was depleted in the active pastures. Trends in stable isotopes ( 13C and 15N) and C chemistry between litter inputs and soil fractions reflected increasing decomposition with increased mineral-association. Disturbance in the active pastures and in the youngest secondary forests affected C turnover through its effect on the stability of soil aggregates. The majority of the soil C pool was recovered in the dense fraction, which also had the longest residence times, providing evidence that mineral associations are the dominant stabilizing mechanisms in these soils. My research demonstrated the value of combining multi-isotopic and molecular techniques with physical fractionation methods to yield new insights into the dynamics of belowground C sequestration and loss with land-use change. Although there were no changes in the bulk soil C pool, the chemistry of C fractions, their isotopic composition, and their physical location in the soil matrix indicated that turnover times of C varied with reforestation of abandoned tropical pastures. These data highlight the importance of physical protection mechanisms on soil C dynamics in highly, weathered tropical soils.
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791 $a Ph.D.
792 $a 2006
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