Energy study on agroforestry systems in northern Hennan Huanghuaihai plain

Abstract

Abstract: Energy study on three agroforestry systems in northern Henan Huanghuaihai plain shows that the annual net energy fixed by Populus×euramericana-Triticum and Zea mays(POTZ) system is 43.6235×10¹⁰·ha^-1, that by Paulownia-Triticum and Zea mays(PATZ) system is 45.6426×10¹⁰·ha^-1, and that by Mains pumila-Triticum and Arachis hypogaea(MTA) system is 49.6000 ×10¹⁰J·ha^-1. The existing energy is respectively 55.2174×10¹⁰, 57.7595×10¹⁰ and 78.4699×10¹⁰J·ha^-1, and the utilization efficiency of light energy is respectively 1.000, 1.047 and 1.138%. In comparing with farmland system(FLS), the energy efficiency of thes, three agroforestry systems increases by 11.88,14.45 and 28.25%, respectively. From the viewpoint of energy, MTA system is the optimal one.

Key words: Agroforestry system, Community type, Energy, water source., rocky mountainous area, oxygen isotope, returning cropland to forestland

Wu Gang, Feng Zongwei. Energy study on agroforestry systems in northern Hennan Huanghuaihai plain[J]. Chinese Journal of Applied Ecology, 1994, 5(4): 355-359.

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