干旱区生态环境知识资源中心(Arid): 黄土高原中部降水梯度带植被覆盖度动态变化特征

Arid

	黄土高原中部降水梯度带植被覆盖度动态变化特征
其他题名	Dynamical Change of Fractional Vegetation Cover in Central Precipitation Gradient Zone of Loess Plateau
	李杏鲜 1; 连晋姣 1; 黄明斌 2
来源期刊	水土保持通报
ISSN	1000-288X
出版年	2014
卷号	34 期号:2 页码:272-275
中文摘要	黄土高原植被生长的水分环境从东南向西北呈现明显的梯度变化,定量分析各降水梯度带植被覆盖度空间分布特征和演变趋势,对正确评价退耕还林草工程的生态效应具有重要意义。选择一条垂直于降水梯度变化的样带,利用MODIS/NDVI数据,基于像元二分模型获取了研究区2000-2010年植被覆盖度空间分布特征,采用斜率法和相关系数法分析了植被覆盖度的变化趋势和影响因素。结果表明:(1)研究区植被覆盖度在空间分布上由东南向西北降低,东南部地区植被覆盖度达82.6%,北部荒漠地区仅为38.6%;(2)由于退耕还林草工程的实施,该区11a间植被覆盖度整体呈现上升趋势,其中2007年植被覆盖度值最高,为65.3%,与降水年际变化趋势一致;(3)研究区植被覆盖度主要受当年4-8月降雨量和气温影响,时间序列具有显著相关性。
英文摘要	Soil water condition for vegetative growth in Loess Plateau presents a gradient change from Southeast to Northwest.Quantitative analyses of spatial distribution and temporal change of fractional vegetative cover(F_c)can offer an important indication for evaluating the regional environmental changes after the implementation of returning farming land to forestry and grass land.The MODIS/NDVI images with 250m*250 m spatial resolution were used as the data source to estimate F_c in the central precipitation gradient zone of Loess Plateau based on a dimidiate pixel method,and the spatial distribution and temporal change of F_c were obtained for the period from 2000 to 2010.The spatial characteristics and temporal trend of F_c were analyzed, while the relationships of F_c with climatic factors were discussed.Results showed that:(1)The F_c in the studied zone presented a decreasing trend from southeast to northwest.The maximum F_c value in southeastern region was 82.6% and the minimum F_c value in northwestern desert was only 38.6%;(2)The average F_c value in the studied zone appeared an increasing trend from 2000 to 2010 due to implementation of the project of returning farming land to forestry or grass land.The maximum average F_c value of 65.3% occurred in 2007 because of the maximum annual precipitation during the studied period;(3)The F_c value in the studied zone was affected by the precipitation and the temperature during the period of April to August in each year,the regression analyses of time series proved a significantly positive correlation between F_c and total precipitation and between F_c and average temperature.
中文关键词	植被覆盖度 ; 动态变化 ; 黄土高原
英文关键词	NDVI fractional vegetation cover NDVI dynamic change the Loess Plateau
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES ; REMOTE SENSING
WOS研究方向	Plant Sciences ; Remote Sensing
CSCD记录号	CSCD:5153837
来源机构	西北农林科技大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/231726
作者单位	1.西北农林科技大学资源环境学院, 黄土高原土壤侵蚀与旱地农业国家重点实验室, 杨凌, 陕西 712100, 中国; 2.黄土高原土壤侵蚀与旱地农业国家重点实验室, 黄土高原土壤侵蚀与旱地农业国家重点实验室, 杨凌, 陕西 712100, 中国
推荐引用方式 GB/T 7714	李杏鲜,连晋姣,黄明斌. 黄土高原中部降水梯度带植被覆盖度动态变化特征[J]. 西北农林科技大学,2014,34(2):272-275.
APA	李杏鲜,连晋姣,&黄明斌.(2014).黄土高原中部降水梯度带植被覆盖度动态变化特征.水土保持通报,34(2),272-275.
MLA	李杏鲜,et al."黄土高原中部降水梯度带植被覆盖度动态变化特征".水土保持通报 34.2(2014):272-275.