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GROWTH, LEAF GAS EXCHANGE AND PRODUCTION OF BIOMASS IN COPPICED AND POLLARDED AGROFORESTRY TREE SPECIES

P. S. Thakur and S. Sehgal
Journal of Tropical Forest Science
Vol. 15, No. 3 (July 2003), pp. 432-440
Stable URL: http://www.jstor.org/stable/23616443
Page Count: 9
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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.
GROWTH, LEAF GAS EXCHANGE AND PRODUCTION OF BIOMASS IN COPPICED AND POLLARDED AGROFORESTRY TREE SPECIES
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Abstract

Four coppicing or pollarding treatments (stems cut at heights of 0.5, 1.0, 1.5 and 2.0 m) were applied to four tree species, aged five years old, in an agroforestry plantation. We measured growth, leaf gas exchange characteristics and foliage and branchwood biomass in four important fuel and fodder agroforestry tree species, namely, Grewia optiva, Celtis australis, Bauhinia variegata and Morus alba. Out of the four species, B. variegata transpired the most followed by M. alba, then C. australis and G. optiva. For G. optiva and M. alba, transpiration was higher from plants pollarded at 1.5 or 2.0 m compared with plants pollarded at 1.0 m or coppiced at 0.5 m. Photosynthetic rate was highest in M. alba and lowest in C. australis. In M. alba and G. optiva, higher rates of photosynthesis were observed in trees pollarded at 1.5 and 2.0 m. Water-use efficiency was higher in M. alba and G. optiva than in B. variegata and C. australis. Maximum leaf size was observed in B. variegata, followed by M. alba and G. optiva. Cutting height did not affect leaf size significantly. For M. alba and G. optiva, LAI was highest at cutting heights of 1.5 and 2.0 m. Coppicing and pollarding significantly affected the production of foliage and branchwood biomass. Fodder and fuelwood production from agroforestry plantations would be maximised by planting M. alba or G. optiva and pollarding annually at a height of 2.0 m. Empat rawatan kopis dan cantasan (batang ditebang pada ketinggian 0.5, 1.0, 1.5 dan 2.0 m) diuji terhadap empat spesies pokok yang berusia lima tahun di sebuah ladang agroperhutanan. Kami mengukur pertumbuhan, ciri pertukaran gas daun serta biojisim dedaun dan kayu dahan dalam empat spesies pokok agroperhutanan yang penting sebagai bahan api dan makanan binatang. Pokok yang terlibat ailah Grewia optiva, Celtis australis, Bauhinia variegata dan Morus alba. Daripada empat spesies ini, B. variegata mengalami transpirasi tertinggi diikuti M. alba, C. australis dan akhirnya G. optiva. Transpirasi lebih tinggi bagi G. optiva dan M. alba yang dicantas pada ketinggian 1.5 atau 2.0 m berbanding pokok yang dicantas pada 1.0 m atau dikopis pada 0.5 m. Kadar fotosintesis paling tinggi bagi M. alba dan paling rendah bagi C. australis. Kadar ini lebih tinggi bagi M. alba dan G. optiva yang dicantas pada 1.5 dan 2.0 m. Kecekapan penggunaan air (WUE) lebih tinggi bagi M. alba serta G. optiva berbanding B. variegata dan C. australis. Saiz daun maksimum dicerap bagi B. variegata diikuti M. alba dan G. optiva. Ketinggian tebangan tidak mempengaruhi saiz daun dengan bererti. Indeks luas daun (LAI) bagi M. alba dan G. optiva paling tinggi pada ketinggian tebangan 1.5 dan 2.0 m. Tebangan kopis dan cantasan mempengaruhi pengeluaran biojisim dedaun dan kayu dahan dengan bererti. Pengeluaran makanan binatang dan bahan api daripada ladang agroperhutanan dapat dimaksimumkan dengan menanam M. alba atau G. optiva yang dicantas setiap tahun pada ketinggian 2.0 m.

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