秦岭─黄淮平原交界带气候边际效应初探

本文基于地理学和生态学中边际效应的观点，论述山地与平原两大系统在一定条件下相互作用，形成一些既不同于山地又异于平原的特殊气候现象──气候边际效应。分析指出，气候边际效应在秦岭－黄淮平原交界带中主要表现为坡地暖带、强降水效应和干旱效应，并对这三种气候边际效应的特征及成因进行了探讨。

A PRIMARY STUDY ON THE CLIMATIC BOUNDARY EFFECT OF THE JOIN ZONE BETWEEN QINLING MOUNTAIN AND HUANGHUAI PLAIN

Based on the boundary effect theory in geography and ecology, this paper discussed the climatic boundary effects resulted from the interaction between Qinling Mountain and Huanghuai Plain systems, and analyzed the main expressions and causes of three kinds of climatic boundary effects that appear in this area.1. Warm slope zone is one of obvious climatic boundary effects distributed extensively in mountain areas. In the join zone between Qinling Mountain and Huanghuai Plain, it is mainly showed by the air temperature, the growth and distribution of plants, soils and human activities, etc.. The separation of cold air by mountains on the west and the north of the join zone, slope radiation and advection, etc. were thought to be the main causes of the warm slope zone.2. The steady topographic wind field-cyclonic shear is often formed in this special terrain, and then rainstorm centers are produced which result in the strong precipitation effect in this join zone. Frequent rainstorm, high precipitation intensity and strong precipitation belt (at about 100-200m altitude) are the main shows of the strong precipitation effect.3. The main show of drought effect is the relatively drought-frequent belt formed at about 300-400m altitude in the high hilly areas, with a monthly drought frequency of 6 %-17 % which is higher than that of plain and mountain areas. The relative rare precipitation belt formed in the high hilly areas, the warm slope zone, the ecotone of the join zone between mountain and plain, and their interactions should be the main causes of this boundary effect.To study the climatic boundary effect of the join zone between mountain and plain, which is a special climatic phenomenon, helps us to obtain a better understanding of the natural resources and environments in the join zone between mountain and plain, which is very important for the valuation and exploitation and utilization of natural resources, and for the prevention and treatment of natural disasters.