气候是影响作物分布最重要的自然环境要素,而气候条件又以热量、水分条件为基本,研究基本的自然要素不但对客观规律的认识较为深刻,也为综合分析创造了条件。

The present paper deals primarily with the thermal and moisture conditions of the Tsingling Shan, central Shensi, and their relationships with the main crops, such as rice, wheat, corn and cotton. Basing on the analysis of radiation, temperature precipitation, soil moisture and agrometeorological indexes in the Tsingling Shan, the author has ob-tamed the following points of view: first, besides the high mountain areas, the thermal condition in the Tsingling Shan favours the cultivation of main crops; secondly, as con-cerning the moisture condition, it is enough for one crop cultivation. Two crops will be obtained wherever the fields can be irrigated, but in the upland areas where water is not available it is necessary to wait for the summer and autumn rains so that only one crop can be raised;and thirdly, the climatic boundaries of main crops cultivation in the Tsingling Shan have been delimitated (Fig. 3-5 in the main text).