NDLI: Organic mulch and fertilization affect soil carbon pools and forms under intensively managed bamboo (Phyllostachys praecox) forests in southeast China

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Organic mulch and fertilization affect soil carbon pools and forms under intensively managed bamboo (Phyllostachys praecox) forests in southeast China

Content Provider	Springer Nature Link
Author	Li, Yongfu Jiang, Peikun Chang, Scott X. Wu, Jiasen Lin, Lin
Copyright Year	2010
Abstract	Phyllostachys praecox is one of the bamboo species used for the production of fine edible bamboo shoots and is widely distributed in Southern China. To maintain or increase the productivity of bamboo shoots, P. praecox forests are intensively managed through heavy fertilization and surface mulch of organic residues such as rice husk to increase soil temperature in the winter. Such management techniques can markedly influence soil quality and the dynamics of soil carbon (C). The objectives of this study were to investigate the long-term impact of intensive management practices on carbon pools and forms in the soil of bamboo forests and explore relationships between different soil organic C fractions, as little such information is currently available.In this study we use a chronosequence (consisting of bamboo forests 1, 5, 10, and 15 years under intensive management) approach to investigate the long-term impact of intensive bamboo forest management on water-soluble organic C (WSOC), hot water-soluble organic C (HWSOC), microbial biomass C (MBC), and readily oxidizable C (ROC) as well as soil organic C chemistry using the $^{13}$C-nuclear magnetic resonance (NMR) technique.Total soil organic C, WSOC, HWSOC, and ROC increased with time under intensive management, while MBC initially increased then decreased. Solid state NMR spectroscopy of soil samples showed that alkyl C and O-alkyl C dominated soil organic C in the intensively managed bamboo forests, alkyl C content and alkyl C to O-alkyl C ratio increased, aromatic C content, and aromaticity of organic matter decreased, while O-alkyl C did not change as duration under intensive management increased. The WSOC and total soil O-alkyl C contents were positively correlated, indicating that O-alkyl C may be the main component of WSOC, consistent with solution $^{13}$C-NMR spectroscopy for WSOC in which O-alkyl C dominated the WSOC fraction regardless of the treatment. Organic matter aromaticity was negatively correlated with HWSOC, indicating that aromaticity was a good indicator of soil organic C stability.We conclude that long-term application of organic mulch over winter increased total soil organic C content but decreased its stability. Mulching of organic residues in intensively managed bamboo forests is beneficial in increasing the sequestration of organic C in those forest ecosystems. Future research should address the impact of intensive management practices on water quality since the decreased stability of organic C increases the risk of its movement.
Starting Page	739
Ending Page	747
Page Count	9
File Format	PDF
ISSN	14390108
Journal	Journal of Soils and Sediments
Volume Number	10
Issue Number	4
e-ISSN	16147480
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-02-02
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	$^{13}$C-NMR Fertilization Bamboo forest Soil organic carbon Surface organic mulch Environmental Physics Environment Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Stratigraphy Earth-Surface Processes

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