| 黄土高原中部降水梯度带植被覆盖度动态变化特征 |
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| 引用本文： | 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].水土保持通报,2014(2):272-275. |
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| 作者姓名： | 李杏鲜 连晋姣 黄明斌 |
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| 作者单位： | 西北农林科技大学资源环境学院, 陕西杨凌 712100;黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西杨凌 712100;西北农林科技大学资源环境学院, 陕西杨凌 712100;黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西杨凌 712100;黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西杨凌 712100 |
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| 基金项目： | 国家自然科学基金项目"黄土高原降水梯度带生态水文过程演变与最佳植被盖度研究"(41171186) |
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| 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。
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| 关 键 词： | 植被覆盖度 NDVI 动态变化 黄土高原 |
| 收稿时间： | 2014/1/24 0:00:00 |
| 修稿时间： | 2/3/2014 12:00:00 AM |
Dynamical Change of Fractional Vegetation Cover in Central Precipitation Gradient Zone of Loess Plateau |
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| LI Xing-xian,LIAN Jin-jiao and HUANG Ming-bin.Dynamical Change of Fractional Vegetation Cover in Central Precipitation Gradient Zone of Loess Plateau[J].Bulletin of Soil and Water Conservation,2014(2):272-275. |
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| Authors: | LI Xing-xian LIAN Jin-jiao and HUANG Ming-bin |
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| Institution: | College of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China;State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Yangling, Shaanxi 712100, China;College of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China;State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Yangling, Shaanxi 712100, China;State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Yangling, Shaanxi 712100, China |
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| Abstract: | 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(Fc) 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 250 m×250 m spatial resolution were used as the data source to estimate Fc in the central precipitation gradient zone of Loess Plateau based on a dimidiate pixel method, and the spatial distribution and temporal change of Fc were obtained for the period from 2000 to 2010. The spatial characteristics and temporal trend of Fc were analyzed, while the relationships of Fc with climatic factors were discussed. Results showed that: (1) The Fc in the studied zone presented a decreasing trend from southeast to northwest. The maximum Fc value in southeastern region was 82.6% and the minimum Fc value in northwestern desert was only 38.6%; (2) The average Fc 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 Fc value of 65.3% occurred in 2007 because of the maximum annual precipitation during the studied period; (3) The Fc 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 Fc and total precipitation and between Fc and average temperature. |
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| Keywords: | fractional vegetation cover NDVI dynamic change the Loess Plateau |
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