| 摘要: |
| 文章基于1981~2006年气温、降水及GIMMS NDVI数据集，采用时滞相关分析法，以新疆地区为例，从植被对水热条件的响应时效与响应程度分析干旱生态系统植被对主要气候因子的月尺度记忆效应。结果表明：新疆地区植被对降水的响应一般以时滞2个月为主，对气温的响应一般以时滞1个月为主，植被对前期降水与对同期气温的响应程度较为明显。但不同气候区域、不同类型的植被对水热因子在记忆效应表现出明显的时空异质性：（1）从时滞响应时效来看，北疆地区植被对气温的响应滞后1个月，对降水的响应滞后2个月，南疆地区植被对气温与降水的响应均滞后2个月，天山山区植被对气温与降水的响应均滞后1个月； 草甸草原、典型草原、荒漠草原及人工植被对气温的响应均滞后1个月，而沼泽植被对气温的响应时滞最长可达3个月，草甸与草原植被对降水的响应均滞后1个月，而荒漠、沼泽及人工植被对降水的响应则滞后2个月； （2）从时滞响应程度来看，北疆地区前1个月的降水对植被的影响程度大于同期与前2个月的影响程度，而气温对植被同期的影响程度大于前期（前1个月与前2个月），南疆地区前1个月的降水与气温对植被的影响程度均大于同期与前2个月，天山山区则是同期的降水与气温对植被的影响程度均大于前期（前1个月）； 草甸与草原植被同期对水热的响应相关程度均大于前期，荒漠与人工植被对前1个月的降水响应程度大于同期，而对温度的响应程度与降水正好相反，同期大于前期，沼泽植被对水热条件的响应程度与草甸与草原植被相反，均呈现为前期大于同期。此结果将有助于更加深入地认识西北干旱生态系统植被对气候变化影响的信息反馈。 |
| 关键词: NDVI 降水 温度 记忆效应 新疆 |
| DOI：10.7621/cjarrp.1005-9121.20150713 |
| 分类号: |
| 基金项目:国家自然基金项目“基于长时间序列NDVI数据的西北干旱区草地植被退化格局及其人为影响研究”（41161066）;国家自然基金项目“静止气象卫星数据反演地表温度算法研究”（41271381） |
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| TIME-LAGGED RESPONSE OF VEGETATION TO HYDRO-THERMAL FACTORS IN XINJIANG REGION |
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Pang Jing1, Du Ziqiang2, Zhang Xiaoyu1
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1.College of Environmental ＆Resource Science, Shanxi University, Taiyuan 030006, China;2.Institute of Loess Plateau, Shanxi University, Taiyuan 030006, China
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| Abstract: |
| Based on the primary data such as temperature, precipitation and GIMMS-NDVI datasets at monthly scale from 1981 to 2006, this paper studied the time-lagged correlation between vegetation and hydro-thermal factors by using time-lagged correlation analysis method in Xinjiang region. The results showed that: (1) In terms of time lag, the lagged time of vegetation in response to temperature was one month in North Xinjiang and two months in South Xinjiang. The lagged time of vegetation in response to precipitation was two months in North Xinjiang as well as South Xinjiang. However, the responses of vegetation to both temperature and precipitation lag a month in Tianshan Mountain. The effect of temperature on meadow steppe, typical steppe, desert steppe and artificial vegetation lasted for one month, and for three months on swamp vegetation. The effect of precipitation on meadow and steppe vegetation lasted for one month and extended to two months on desert, swamp and artificial vegetation. (2) In terms of time duration, the effect of the previous one month's precipitation on vegetation was strongerthan that of the concurrent and previous two months, while the effects of the concurrent temperature was stronger than that of the preceding 1-2 month in North Xinjiang. And there was a higher correlation between vegetation and previous month's temperature and precipitation than that of the concurrent and preceding two months temperature and precipitation in South Xinjiang. However, vegetation was more strongly related to the concurrent precipitation and temperature than other periods in Tianshan Mountain. The correlation coefficient of meadow and steppe vegetation between the concurrent temperature and precipitation was greater than that in other periods. The correlation coefficient between desert and artificial vegetation and precipitation for the previous month was higher than that between vegetation and the concurrent precipitation. On the contrary, the correlation between desert and artificial vegetation and the concurrent temperature was more strongly than that of previous month. For meadow and steppe vegetation, marsh vegetation was more related to the precipitation and temperature for the previous month than that for the concurrent month. |
| Key words: NDVI precipitation temperature time-lagged effect Xinjiang |
