phosphorus addition mitigates n2o and ch4 emissions in n-saturated subtropical forest, sw china
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2017
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Abstract
Chronically elevated nitrogen (N) deposition has led to severe
nutrient imbalance in forest soils. Particularly in tropical and subtropical
forest ecosystems, increasing N loading has aggravated phosphorus (P)
limitation of biomass production, and has resulted in elevated emissions of
nitrous oxide (N2O) and reduced uptake of methane (CH4), both of
which are important greenhouse gases. Yet, the interactions of N and P and
their effects on greenhouse gas emissions remain elusive. Here, we report
N2O and CH4 emissions together with soil N and P data for a period
of 18 months following a single P addition (79 kg P ha−1, as
NaH2PO4 powder) to an N-saturated, Masson pine-dominated forest
soil at TieShanPing (TSP), Chongqing, south-western (SW) China. We observed a significant
decline in both nitrate (NO3−) concentrations in soil water (5 and 20 cm
depths) and in soil N2O emissions, following P application. We
hypothesise that enhanced N uptake by plants in response to P addition,
resulted in less available NO3− for denitrification. By contrast to
most other forest ecosystems, TSP is a net source of CH4. P addition
significantly decreased CH4 emissions and turned the soil from a net
source into a net sink. Based on our observation and previous studies in
South America and China, we believe that P addition relieves N inhibition of
CH4 oxidation. Within the 1.5 years after P addition, no significant
increase of forest growth was observed and P stimulation of forest N uptake
by understorey vegetation remains to be confirmed. Our study indicates that P
fertilisation of N-saturated, subtropical forest soils may mitigate N2O
and CH4 emissions, in addition to alleviating nutrient imbalances and
reducing losses of N through NO3− leaching.
| Reference Key |
yu2017biogeosciencesphosphorus
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|---|---|
| Authors | ;L. Yu;Y. Wang;Y. Wang;X. Zhang;P. Dörsch;J. Mulder |
| Journal | tetrahedron letters |
| Year | 2017 |
| DOI |
10.5194/bg-14-3097-2017
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| URL | |
| Keywords |
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