中文摘要：

基于1999—2010年SPOT—VEGETATION旬值NDVI数据，通过经改进的时滞偏相关等方法，并结合该地区降水量和气温数据，解释植被覆盖年内变化对气候要素的响应。结果表明：①年内植被覆盖变化与气温的变化较为一致，气温较降水对年内植被生长影响强烈；②植被覆盖低、降水量小、气温低的地区与降水量的年内相关强，滞后时间集中于0旬～3旬；③植被覆盖与气温的年内相关程度不受降水量与气温空间分布的影响，滞后时间集中于2～3旬与8-9旬；④水热组合较好的植被覆盖高的地区，植被覆盖均对降水量与气温的年内响应敏感，相反则敏感程度降低，气温对黄土高原植被覆盖的年内影响占主导地位，农业生态区与山地森林生态区植被覆盖年内变化主要受气温的影响，降水影响不明显；⑤黄土高原西北部和西南部降水或气温的单独影响不利于植被生长，黄土高原西北部，环境干旱，植被稀疏，其植被覆盖与降水量的年内相关较强，但是植被生长相对于其他地区较为迟缓；黄土高原西部，植被覆盖与气温的年内相关程度相对不明显且迟缓。主要是由于黄土高原西北部和西部，降水或气温远低于黄土高原平均水平，而在单气候因素影响下植被生长会受到抑制造成的。

英文摘要：

Using SPOT-VEGETATION NDVI data for 10 days during 1999-2010 for vegetation cover on the Loess Plateau, we analyzed inter-annual and intra-annual variation in vegetation cover. We found that the correlation between vegetation cover and climate shows that annual vegetation cover was better correlated with precipitation, and there is a high correlation in the area with low vegetation cover, less precipitation and low temperature. The lag time to precipitation is 0-30 days. The change in 10-day vegetation cover is consistent with variation in temperature. The vegetation response to precipitation and temperature is more sensitive in high vegetation cover regions, due mainly to the joint function of hydrothermal combination. The lag time to temperature is 20-30 and 80-90 days. The response between intra-annual vegetation cover and climatic factors is sensitive in the good hydrothermal region. Vegetation variation in the agriculture zone and mountain forest is mainly affected by temperature. The intra-annual correlation between vegetation cover and precipitation is greater in the northwestern Plateau, but slower. The intra-annual correlation between vegetation cover and temperature is less and slower in the western Plateau. This phenomenon is because precipitation and temperature are below average in the northwestern and western regions.