• 关键词：秦岭南坡  植被覆盖  变化斜率  温度

• 基金项目：国家科技基础性工作专项重点项目(No2007FY110800);西北大学研究生创新教育项目(No08YJC08)

• 孙华
• 西北大学城市与资源学系, 西安 710127

• 白红英
• 西北大学城市与资源学系, 西安 710127

• 张清雨
• 西北大学城市与资源学系, 西安 710127

• 雒新萍
• 西北大学城市与资源学系, 西安 710127

• 张善红
• 西北大学城市与资源学系, 西安 710127

• 摘要：利用1km分辨率的SPOTVEGETATION(SPOTVGT)数据对秦岭南坡1998～2007年植被覆盖空间变化特征进行分析,并研究了温度与年最大NDVI(归一化植被指数)值的相关性.结果表明:秦岭南坡年最大NDVI值大于0.57的面积占总面积的97%.植被覆盖增加地区的面积总体大于退化的面积,但年最大NDVI值显著减小的像元占像元总数的4.45%以上,且部分阔叶林分布区的NDVI值显著降低;草灌丛是秦岭南坡退化最严重的植被类型.年最大NDVI值与前一年8月至当年7月平均温度具有显著的相关性,其大小随平均温度的变化符合y=-0.004x²-0.0015x+0.7168(p<0.05).在研究区范围内,当前一年8月至当年7月平均温度低于某一温度(约为(13.0±0.2)℃)时,其与年最大NDVI呈正相关,而高于另一温度界限(约为(14.4±0.2)℃)时则呈负相关,其中研究区南端的人为耕作区表现尤为敏感.

• Abstract：By using SPOT VEGETATIONdata with a resolution of 1 km,we analyzed the tempo-spatial dynamic of vegetation and its response to temperature in the southern regions of the Qinling Mountains from 1998 to 2007.According to the results,about 97% of the total area had a higher annual max NDVI(NDVI_max) than 0.57 in the southern region of the Qinling Mountains.The area where the vegetation coverage increased was greater than that where the vegetation was degraded.However,the pixels where NDVI_max significantly decreased accounted for more than 4.45% of the total pixels,and the NDVIin the partial broad-leaved forest-distributed area reduced significantly.The most degraded vegetation was shrubs and bushes in the southern region of the Qinling Mountains.NDVI_max was correlated significantly with the mean air temperature calculated from last August to July,with the equation of y=-0.004x2-0.0015x+0.7168(p<0.05).When the mean air temperature was below(13.0±0.2)℃,the relation between NDVI_max and the temperature was positive,while when the mean air temperature was above(14.4±0.2)℃,the relation was negative,especially in the southern cultivated area.

• Key words：the southern region of Qinling Mountains  vegetation coverage  changing slope  temperature

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