横断山_云南高原干热河谷形成原因研究.pdf

22 5 　　　 Vol.22, No.5 2000 9 RESO U RCES SCIENCE Sep., 2000 ——— 何永彬　　卢培泽　　朱　彤 (云南地理研究所, 昆明　650223) 　　　:“”。 , ;, , ———、、、、 。, “ ”, , 4 :　① ;　②;　③;　④ 。4 , “”, 。 　　:———;; :P541(27)　　:A 　　:1007-75 88 (2000)05-0069-04 CAUSES FOR THE FORMATION OF DRY-HOT VALLEYS IN HENGDUAN MOUNTAIN-YUNAN PLATEAU HE Yong-bin 　　L U Pei-ze 　　ZHU Tong (Yunnan Institute of Geography, Kunming 650223, China) Abstract:Qinghai-Tibe Pla eau is a unique region impac ed by “pla eau geographical ef fec ”.Na ural zonali y of Yunnan highland is uniqueness in ropics w here ver ical differen ia ion in w a er and hea oc- curs due o changes in relief and al i ude;he base bel of ver ical na ural zone of Yunnan highland is usually valley area, he deep dissec ed valleys can even be er reflec horizon al zonal condi ions.How ev- er,dry-ho valleys of special ecoclima ic landscapes occur in par of he river sec ions of Nujiang,Lan- cangjiang, Yuanjiang,Jinshajiang and Nanpanjiang on Hengduan M oun ain-Yunnan Pla eau .Tw o view poin s on he causes of forma ion of dry-ho valleys have exis ed, namely,primary induced heory and secondary induced heory .The paper,approaching f rom he in egral poin of view of na ural environ- men ,summarizes and analyzes fou r fac ors closely rela ed o dry-ho valleys:1)regional clima ic envi- ronmen and w a er-hea balance ;2 )adverse succession of plan s and eco-environmen al degrada ion 3 ) land s ruc u re and valley sloping land degrada ion;4 )ar ificial in erference .T he poin of dual induced heory rela ed o he causes of forma ion of dry-ho valleys are inde ified and priliminary classifica ion of he dry-ho