|
|
|
| Model and effect of ecological restoration of dry-hot valley: A case study of the CAS Dongchuan Debris Flow Observation Station |
| Cui Peng, Wang Daojie, Wei Fangqiang |
| Institute of Mountain Hazards and Environment, Chinese Academy of Sciences & Ministry of Water Resources, 610041, Chengdu, China |
|
|
|
|
Abstract The ecological environment of dry-hot valley along Jinsha River is heavily fragile, resulting from that mountain hazards have occurred frequently such as landslide, debris flow and heavy soil erosion and water loss. According to soil conditions at different sites and biological characteristics of plants, two ecological restoration models are introduced by the case study of the Dongchuan Debris Flow Observation Station, CAS. The restorative measures are employed to bare slope by planting trees, shrubs and herbs. And the other one is applied to slope farmland by the way of integrated agriculture measures. And effects of ecological restoration are also monitored and invested, which demonstrate that the surface runoff is only 14.9% and soil loss is 6.4% respectively on the slopes treated by planting trees and herbs, compared to that on bare slopes. The final infiltration ratio is 0.58mm/min on restored shrub-herb land, and is only 62% on bare slopes and 84% on degraded shrub-herb land respectively. The amount of plant species increases from 10 to 30 after restoration. The soil seed-bank density increases from 300grains/m2 to 1217grains/m2～1450/m2. The animal species increases by 10 species. The productivity of slope farmland rises from 750～1500 to 4500～6000kg/hm2. The per capita annual income increases from 200 to 800～1000RMB.
|
|
Received: 03 February 2005
|
|
|
|
|
null
|
|
null
|
|
|
|
