摘要
黄土高原重点水土流失区位于我国几大地形的中间地带 ,其自然生态条件的渐变特征十分明显 ,是典型的生态过渡地带。多年来的造林实践工作 ,使得人工栽培乔木树种既有适应当地环境条件的北温带成分 ,也有一些毗邻地区的泛热带等成分 ,还有许多外来引进树种成分。区内人工栽培乔木树种的区系成分较为丰富 ,与毗邻的天然次生林区十分相近。在中国种子植物地理成分分布区的 15个类型中 ,除热带亚洲至热带非洲成分、中亚成分 2种类型外 ,本区有其余 13个类型。植物区系成分与水热等气象条件密切相关 ,降水量大、热量高的东南部地区区系成分复杂 ,树种多 ,而西北干旱地区则刚好相反。
The main soil and water losses area in the Loess Plateau, located among the several large topographic zones in China, has a gradual change characteristics in natural eco conditions,and thus is a typical zone of gradual ecological changes. Components of the north temperate zone, pan tropic zone in adjacent areas, and some exotic introductions, are the main compositions of artificial arbor trees in the areas due to the long times afforestation practice. The floristic components are plentiful and very similar to the abut natural forest areas. There are 13 types of all the 15 geographic elements of seed plants except the element of tropical Asia and Africa, element of central Asia. The floristic components correlate with the meteorological conditions, the more the precipitation and heat quality, the more complex the floristic components. The humid southeastern part has more arbor trees than the dry northwestern one.
出处
《水土保持学报》
CSCD
北大核心
2001年第6期47-49,61,共4页
Journal of Soil and Water Conservation
基金
水利部黄委会第二期水土保持基金项目
暨黄土高原水土保持世行贷款资助项目 (项目编号 :97-0 5 )
关键词
区系
人工栽培乔木树种
重点水土流失区
黄土高原
floristic characteristic
artificial arbor trees
main soil and water losses areas
Loess Plateau
