横断山地区和祁连山地区自然地理条件与农业系统的比较

本文全面分析比较了横断山与祁连山地区自然地理条件与特征,以及它们对发展大农业的影响,指出了该区自然资源合理利用与环境保护的途径。

A COMPARATIVE STUDY ON PHYSICO-GEOGRAPHICAL CONDITIONS AND AGRICUL-TURAL SYSTEM BETWEENTHE HENGDUAN AND THE QILIAN MOUNTAINS REGION

Both of the Hengduan Mts.Region and Qilian Mts.Region are the border montane ranges of the Qinghai-Xizang Plateau.Yet, the former is located on its subhumid southeastern border, with montane needle-leaved forests and alpine meadow as domimant vegetatien; while the latter on its semia- rid northeastern border, under the domonation of montane and alpine ste- ppes. Both them are characterized by vertical zonation.Yet, the former is more conspicuous and varied, with N-S aligned high mountains-deep gorges as dominant landscape; while the latter is essentially W-S trending high mo- untains interspersed with broad valleys. Agriculturally, both are featured by vertical productive systems, with farming in low valleys, forestry and animal husbandry on montane slopes under eternal snow on montane tops.Only in the Hengduan Mts.region the vertical spectra are more varied and forests are quite outstanding; while in Qilian Mts.Region forestry is rather insignificant.Each has a harsh ecolo- gical environment for agricultural development, but there are some diff- erentiations in major physical constraints.