Relationships between tree-ring width index and NDVI of grassland in Delingha
Relationships between tree-ring width index and NDVI of grassland in Delingha
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DOI：
10.1007/s11434-006-1106-4
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发表时间：
2006-05-01
影响因子：
--
通讯作者：
Shao Xuemei
中科院分区：
文献类型：
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作者：
He Jicheng;Shao Xuemei
以祁连圆柏（Sabina przewalskii Kom.）利用1982 ~ 2001年的树木年轮宽度指数序列、草地植被指数（NDVI）和气候资料，分析了树木年轮宽度指数、草地植被指数与气候资料的关系。在此基础上，探讨了草地植被指数与树轮宽度的关系。结果表明：（1）6月气温和降水量对德令哈市草地树木年轮宽度指数和植被指数的影响较大。(2)5个树轮宽度指数序列（DLH 1-DLH 5）与6 - 9月草地月NDVI均存在显著相关关系，其中8月树轮宽度指数序列与草地月NDVI的相关性最显著。(3)由DLH 1-DLH 5序列提取的第一主成分PC 1与草地生长季（6 - 9月）的月NDVI和生长季的平均NDVI具有较好的一致性，这是由于它们对德令哈供水限制的共同响应。本研究可以增加对德令哈草地过去动态的研究，因为在过去的千年草地NDVI的变化已经从PC 1重建。
Using five well-replicated Qilian juniper (Sabina przewalskii Kom.) tree-ring width index series, monthly normalized difference vegetation index (NDVI) of grassland, and climatic data from 1982 to 2001, the relationships between tree-ring width index, NDVI of grassland, and climatic data were analyzed firstly. Then, the relationship between tree-ring width index and NDVI of grassland was explored. The results showed that: (1) Temperature and precipitation in June influenced tree-ring width index and NDVI of grassland deeply in Delingha. (2) There were Significant relationships between five tree-ring width index series (DLH1-DLH5) and monthly NDVI of grassland from June to September, with the most significant relationship being between tree-ring width index series and NDVI of grassland in August. (3) The PC1 (the first principal component derived from DLH1-DLH5 series) exhibited good agreement with monthly NDVI of grassland in the grass growth season (from June to September) and the averaged NDVI in the growth season, which was attributed to their common responses to water-supply limit in Delingha. This study may allow an increase in studying the past dynamics of grassland in Delingha in that the variation of grassland NDVI during the last millennium has been reconstructed from PC1.