地理科学 ›› 1994, Vol. 14 ›› Issue (2): 152-156,200.doi: 10.13249/j.cnki.sgs.1994.02.152

• 论文 • 上一篇    下一篇

黄土高原森林草原的基本特征

朱志诚   

  1. 西北大学生物系 西安710069
  • 收稿日期:1993-03-01 出版日期:1994-03-20 发布日期:1994-03-20

BASIC FEATURES OF FOREST STEPPE IN THE LOESS PLATEAU

Zhu Zhicheng   

  1. Department of Biology, Northwest University, Xi’an 710069
  • Received:1993-03-01 Online:1994-03-20 Published:1994-03-20

摘要: 黄土高原上水热自东南向西北有规律递减,在旱中生和中旱生植物组成的草甸草原背景上,稀疏的分布着一些旱中生矮乔木,称疏林草原,这类群落乔木覆盖度一般不超出20%,通常10%左右,有时低于5%.大致420—520mm 隆水量是决定黄土高原森林草原存在的主要因素.

Abstract: The Loess Plateau is situated at 33°3′-40°6′N,100°5′-114°3′E. It is covered with loess of 50-150 m thick. As it is eroded by flowing water for a long time,it formed alone yuan,beam-ridges and hill-gullies topography. Humidity and heat decrease gradu-ally from southeast to northwest in the Loess Plateau. The forest is replaced by the steppe, and an obvious transition zone formed between them, it is a forest steppe. Its characteristic is that stunted exro-mesophilous trees are distributed sparsely on the meadow steppe. The meadow steppe mainly consists of xero-mesophytes and meso-xero-phytes,the trees cover degree is usually less than 20%,generally about 10%,sometimes below 5%. Precipitation of about 420-520 mm is a decisive factor of the existence of the forest-steppe in the Loess Plateau.