试论中国第三果树带的形成与发展

本文提出了果树带的新概念，即根据果树栽培的高效优质及其自然分布情况，提出在长江以南（北纬１８─３２°）柑桔为主的第一果树带和长江以北（北纬３２─４３°）苹果为主的第二果树带之间，即北纬２５─３５°建立和发展以猕猴桃为主的第三果树带的新论点。同时，因海拔高度的变化以及在两带的边缘地域，表现出部分过度交互型特征。本文还进一步阐述了以猕猴桃为代表的第三果树带形成和发展的可能与条件，指出提高果树种植效益与不同果树相应气候带的关系，分析说明了中国第三果树带的形成与发展的重要意义。此外，还对第三果树带的果树组成、发展方向和途径等关键性问题进行了讨论，为中国第三果树带的形成与发展提供了理论依据。

PRELIMINARY STUDIES ON THE FORMATION AND DEVELOPMENT OF THE THIRD TRIEE CROP ZONE IN CHINA

In concerning with the new concept of tree crop zones,this paper analyzes the current situation,climatic features composition of the representative tree crops in the first and second tree crop zones in China,indicating that there is a transitionany tree crop zone known as the third crop zone between the first and the second zone.Starting with the climatic features,tree crop resources and biological features,this paper suggests that the representative tree crop should be kiwifruit,which becomes the basis of formation and development of the third tree crop zone in China.