干旱区研究

Arid Zone Research ›› 2016, Vol. 33 ›› Issue (3): 554-559.doi: 10.13866/j.azr.2016.03.15

• Plant and Plant Physiology • Previous Articles     Next Articles

Difference of Vegetation Restoration in the Loess Plateau Based on QuickBird Image

Anikezi Rouzi, ZHANG Yan, HE Yuan-mei, LI Zhen, YANG Song   

  1. Key Lab of Soil and Water Conservation and Desertification Combating, Ministry of Education, Beijing Forestry University, Beijing 100083, China
  • Received:2015-04-06 Revised:2015-09-16 Online:2016-05-15 Published:2016-05-31

PDF (PC)

702

Like

Abstract: In order to restore vegetation with different site conditions in different parts of the Loess Plateau, the project of returning farmland to forestland or grassland was implemented. The change of vegetation in three typical regions was analyzed based on the Quickbird images of the same time phase in 6-9-year periods and 5 m×5 m DEMs. The results are as follows: ① Vegetation coverage of all 8 types with different site conditions was increased in the Wuqi study area. The vegetation coverage on slightly steep sunny slope (15°-25°) and steep sunny slope (25°-35°) was about 6% lower than that on similar shady slope, while little difference was found between sunny and shady gentle slope (<15°) or sunny and shady extremely steep slope (>35°). It was difficult to restore vegetation on steep sunny slope and extremely steep slope in the Wuqi study area where the vegetation coverage was still lower than 50% after the project of returning farmland to forestland or grassland was implemented for longer than 10 years; ② During the 6-9-year periods, the area of land with vegetation coverage lower than 45% was reduced in varying degrees in the Wuqi, Jixian and Suide study areas. Vegetation restoring rate was the highest in Jixian, and then in Suide and Wuqi, which was related to the geographical locations and the water and heat conditions; ③ After the vegetation in the Wuqi study area was restored for longer than 10 years, the plots with vegetation coverage lower than 30% were mainly distributed on steep slope and extremely steep slope. In the Jixian study area with relatively good water and heat conditions, the vegetation restoration of different types on sunny slope was similar; on the gentle slope with good site conditions, however, the area of land with vegetation coverage lower than 30% was still large. This paper could provide a reference for comprehensively appraising the project of returning farmland to forestland or grassland on the Loess Plateau.

Key words: vegetation coverage, site type, vegetation restoration, QuickBird image, Loess Plateau