|
|
|
| Distribution regularity of hydro-thermal factorsin the interface of sand land in the northern mountain of Hebei Province |
| Yang Wenji,Li Yiwei,Zhao Tingning,Wang Xiuru |
| Key Lab.of Soil & Water Conservation and Desertification Combating of Ministry of Education,College of Soil and Water Conservation,Beijing Forestry University,100083,Beijing,China |
|
|
|
|
Abstract In order to find out the regularity of hydro-thermal condition affected by topography,hydro-thermal factors at different terrains were observed at Xiaobazi country of Hebei province during growing season in 2004 and 2005.The results showed that the influence of terrains on dynamic variety of hydro-thermal factors is insignificant while significant in spatial distribution of that.During growing season,the distribution regularity of direct solar radiation is that of hilltop> sunny slope> shady slope.The air temperature is that of sunny slope >hilltop > shady slope as well as accumulated temperature of ≥0?℃and ≥10?℃,ground temperature(5?cm,10?cm and 20?cm) and accumulated soil temperature of ≥0?℃and ≥10?℃.The air humidity was in the order of shady slope>hilltop>sunny slope and the soil moisture was that of hilltop>shady slope>sunny slope.The spatial distribution law of hydro-thermal factors can offer reference to the revegetation in this region.
|
|
Received: 06 September 2006
|
|
|
|
|
|
|
