双向“锅盖效应” 诱发戈壁荒漠长草机制分析

The Gobi Desert in Northwest China is a barren land with an arid climate. However, after the completion of the Taratan photovoltaic power station, there is a phenomenon of grass growing in a large area. In this paper, we explore the possible sources of weed growth in PV power station. The induced mechanism of two-way "pot cover effect" was initially investigated from a qualitative perspective. The temperature and moisture patterns of the shallow soil at three measurement points and the atmosphere were analyzed by comparing the PV panel area with the non-PV panel area, and a simple quantitative analysis of the annual and daily cycle moisture patterns of the two-way "pot cover effect" was conducted. The results show that the combined factors of PV panels and hardened ground cover induce two-way "pot cover effect". The PV panels can significantly reduce the surface temperature of soil in summer. The positive "pot cover effect" is dominant in winter and spring, which is the main moisture supply to maintain the survival of weeds in the shallow soil layer, and the annual circulating water increases by about 11%~20%. However, the reverse "pot cover effect" is dominant in summer and early autumn, which ensures that the daily moisture demand of weeds fluctuates within a small range. The relevant research in this paper can also provide reference for desert sand control.