Original Articles

Land Cover Change and its Causes in Yulin Distr ict

  • Department of Resources, Environment and Geography, the Centre for Land Study|Peking University, Beijing 100871

Received date: 2005-08-01

  Revised date: 2006-09-01

  Online published: 2006-11-25


Yulin district is located in the most Northern part of Shaanxi province, between 36°57′and 39°34′N, and 107°28′and 111°15′E. Yulin district is one of the areas of the most serious soil erosion in the world and receives a lot of attention from the Chinese government and international societies. After the establishment of the People's Republic of China, the desertification intensity declined because of rehabilitation measures. However, there is lack of knowledge concerning the dynamics of land cover and the complex role of factors in inducing changes in land cover. In the study, by usage of normalized difference vegetation index(NDVI) as an indicator of vegetation activity, seasonal trends of vegetation activity and their dynamic responses to climate changes in Yulin district were explored based on remotely sensed data (NOAA- AVHRR and VEGETATION) from 1981 to 2004. As a result, spatially averaged seasonal NDVI in Yulin showed a pronounced increase during the last two decades. The average autumn NDVI indicated the most significant increase. By analyzing inter- annual changes in seasonal NDVI, it was found that the advance of growing season was a major way for response of vegetation activity to climate changes and that the way exhibited a large regional heterogeneity. From the southeast to the northwest, change amplitude showed a declining trend.

Cite this article

LI Zhongfeng|CAI Yunlong . Land Cover Change and its Causes in Yulin Distr ict[J]. PROGRESS IN GEOGRAPHY, 2006 , 25(6) : 102 -107 . DOI: 10.11820/dlkxjz.2006.06.012


[1] 李忠峰, 王一谋, 冯毓荪. 基于RS 与GIS 的榆林地区土地利用变化分析. 水土保持学报, 2003, 17(2):95~99.

[2] Liu Yansui, Jay Gao, Yanfeng Yang. A holistic approach towards assessment of severity of land degradation along the Great Wall in northern Shaanxi province, China. Environmental Monitoring and Assessment, 2003, 82 (2): 187~202.

[3] 王绍武,董光荣. 中国西部环境特征及其演变. 北京: 科学出版社, 2002, 206~207.

[4] 王长耀,布和敖斯尔,狄小春. 遥感技术在全球环境变化研究中的作用. 地球科学进展, 1998, 13(3):278~284.

[5] 仙巍, 邵怀勇, 周万村. 嘉陵江中下游地区近30 年土地利用与覆被变化过程研究. 地理科学进展, 2005, 24(2):114~ 121.

[6] 路云阁, 徐月卿, 蔡运龙. 基于遥感技术和GIS 的小流域土地利用/覆被变化分析. 地理科学进展, 2005, 24(1):80~86.

[7] 方精云, 朴世龙, 贺金生. 近20 年来中国植被活动在增强. 中国科学(C 辑) , 2003, 33(6):554~565.

[8] 刘爱霞, 王静, 吕春艳. 基于MODIS 数据的北京西北部地区土地覆盖分类研究. 地理科学进展, 2006, 25(2):96~107.

[9] 刘彦随, Jay Gao. 陕北长城沿线地区土地退化态势分析. 地理学报, 2002, 57(4):443~450. 10] 杨述河, 闫海利, 郭丽英. 北方农牧交错带土地利用变化及其生态环境效应. 地理科学进展, 2004, 23( 6) : 49~55.

[11] 龚道溢,史培军,何学兆. 北半球春季植被NDVI 对温度变化响应的区域研究. 地理学报, 2002, 57:505~514.