Surface energy balance partitioning over a chili bell crop under two types of plastic mulch.

摘要

Previous studies have been conducted to evaluate the effect of plastic mulch on the temperature of the upper soil profile and its relations to the growth and yield of crops. However, the presence of plastic mulch on the soil surface also affects all components of the energy balance (net radiation, Rn; sensible heat flux, H; latent heat flux, LE and soil heat flux, G). In this study, the energy balance components through the different growth stages of the chili crop were measured and the daily and seasonal partitioning of the surface energy balance was evaluated. The results showed that net radiation was the major term of the energy balance. At the early stage of the crop growth most of the net radiation was dissipated in sensible heat flux (H), because the crop only covered a small part of the bed. Once the crop reached full foliage growth, Rn was dissipated mainly in LE. During crop senescence, most of the Rn was dissipated in H in a lower rate in G, and small proportion on LE.