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ECOSYSTEM CARBON POOLS IN MIXED STANDS OF HARDWOOD SPECIES AND MASSON PINE

HB Fan, WF Liu, JP Wu, YY Li, YH Yuan, YC Liao, RZ Huang and XQ Su
Journal of Tropical Forest Science
Vol. 25, No. 2 (April 2013), pp. 154-165
Stable URL: http://www.jstor.org/stable/23617029
Page Count: 12
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
ECOSYSTEM CARBON POOLS IN MIXED STANDS OF HARDWOOD SPECIES AND MASSON PINE
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Abstract

Transformation of conifer monoculture into mixed conifer—hardwood plantations has been considered as an efficient management practice to sustain forest productivity. However, effects of this management practice on ecosystem carbon sequestration are still unclear. In this study, seedlings of five hardwood species (Michelia macclurei, Castanopsis fissa, Castanopsis sclerophylla, Castanopsis kawakamii and Cyclobalanopsis myrsinaefolia) were planted separately under a Pinus massoniana (Pm) stand, and designated as Pm—Mm, Pm—Cf, Pm—Cs, Pm—Ck and Pm—Cm respectively. After 16 years of establishment, total ecosystem carbon increased by 18.0, 53.8, 25.2, 21.7 and 38.7 t ha-1 in the Pm—Mm, Pm—Cf, Pm—Cs, Pm—Ck and Pm—Cm stands respectively compared with Pm stand. Aboveground carbon storage increased from 97.72 t ha-1 in the Pm stand to 109.52, 131.31, 107.77, 115.76 and 123.37 t ha-1 in the five mixed stands respectively, greatly due to an increase in hardwood tree biomass. Mineral soil carbon stock (0—60 cm) was 55.0 t ha-1 in the Pm stand and 61.0, 72.4, 69.6, 58.6 and 66.8 t ha-1 in the five mixtures respectively. Our results suggested that stand improvement by underplanting could be proposed as forest management option for increasing ecosystem carbon sequestration. Langkah mengubah ladang monokultur konifer kepada ladang campur konifer dan kayu keras merupakan amalan pengurusan yang cekap untuk mengekalkan produktiviti hutan. Bagaimanapun, kesan amalan ini terhadap pensekuesteran karbon ekosistem masih belum jelas. Dalam kajian ini, anak benih lima spesies kayu keras (Michelia macclurei, Castanopsis fissa, Castanopsis sclerophylla, Castanopsis kawakamii dan Cyclobalanopsis myrsinaefolia) ditanam secara berasingan di bawah dirian Pinus massoniana (Pm). Dirian ini masing-masing diberi kod Pm—Mm, Pm—Cf, Pm—Cs, Pm—Ck, and Pm—Cm. Selepas 16 tahun, jumlah karbon ekosistem meningkat sebanyak 18.0 t ha-1, 53.8 t ha-1, 25.2 t ha-1, 21.7 t ha-1 dan 38.7 t ha-1 masing-masing di dirian Pm—Mm, Pm—Cf, Pm—Cs, Pm—Ck dan Pm—Cm. Simpanan karbon atas tanah meningkat daripada 97.72 t ha-1 di dirian Pm ke 109.52 t ha-1, 131.31 t ha-1, 107.77 t ha-1, 115.76 t ha-1 dan 123.37 t ha-1 masing-masing di dirian Pm—Mm, Pm—Cf, Pm—Cs, Pm—Ck dan Pm—Cm, terutamanya akibat pertambahan biojisim pokok. Stok karbon tanah ((0—60 cm) adalah sebanyak 55.0 t ha-1 di dirian Pm dan 61.0 t ha-1, 72.4 t ha-1, 69.6 t ha-1, 58.6 t ha-1 dan 66.8 t ha-1 di lima dirian campur itu. Keputusan kami mencadangkan bahawa penambahbaikan dirian secara tanam bawah dapat disyorkan sebagai pilihan pengurusan hutan bagi meningkatkan pensekuesteran karbon dalam ekosistem.

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