植物生态学报 ›› 2006, Vol. 30 ›› Issue (1): 1-8.DOI: 10.17521/cjpe.2006.0001
所属专题: 青藏高原植物生态学:生态系统生态学
• 研究论文 • 下一篇
收稿日期:
2004-11-08
接受日期:
2005-06-02
出版日期:
2006-11-08
发布日期:
2006-01-30
作者简介:
E-mail:yhyang@water.pku.edu.cn
基金资助:
Received:
2004-11-08
Accepted:
2005-06-02
Online:
2006-11-08
Published:
2006-01-30
摘要:
为揭示气候变化对青藏高原草地生态系统的影响及其生态适应机制,利用1982~1999年间的NOAA/AVHRR NDVI数据和对应的气候资料,研究了近20年来青藏高原草地植被覆盖变化及其与气候因子的关系。结果表明,18年来研究区生长季NDVI显著增加(p=0.015),其增加率和增加量分别为0.41% a-1和0.001 0 a-1。生长季提前和生长季生长加速是青藏高原草地植被生长季NDVI增加的主要原因。春季为NDVI增加率和增加量最大的季节,其增加率和增加量分别为0.92% a-1和0.001 4 a-1;夏季NDVI的增加对生长季NDVI增加的贡献相对较小,其增加率和增加量分别为0.37% a-1和0.001 0 a-1。3种草地(高寒草甸、高寒草原、温性草原)春季NDVI均显著增加(p<0.01;p=0.001; p=0.002); 高寒草甸夏季NDVI显著增加(p=0.027),而高寒草原和温性草原夏季NDVI呈增加趋势,但都不显著(p=0.106; p=0.087);3种草地秋季NDVI则没有明显的变化趋势(p=0.585; p=0.461; p=0.143)。3种草地春季NDVI的增加是由春季温度上升所致。高寒草地(高寒草甸和高寒草原)夏季NDVI的增加是夏季温度和春季降水共同作用的结果。温性草原夏季NDVI变化与气候因子并没有表现出显著的相关关系。高寒草地植被生长对气候变化的响应存在滞后效应。
杨元合, 朴世龙. 青藏高原草地植被覆盖变化及其与气候因子的关系. 植物生态学报, 2006, 30(1): 1-8. DOI: 10.17521/cjpe.2006.0001
YANG Yuan-He, PIAO Shi-Long. VARIATIONS IN GRASSLAND VEGETATION COVER IN RELATION TO CLIMATIC FACTORS ON THE TIBETAN PLATEAU. Chinese Journal of Plant Ecology, 2006, 30(1): 1-8. DOI: 10.17521/cjpe.2006.0001
图2 1982~1999年青藏高原草地生长季平均NDVI、平均温度和降水量的年际变化
Fig.2 Interannual variations in growing season's mean NDVI, mean temperature, and precipitation of grasslands on the Tibetan Plateau over the period of 1982-1999
图3 1982~1999年高寒草甸(a)、温性草原(b)和高寒草原(c)生长季平均NDVI的年际变化
Fig.3 Interannual variations in growing season's mean NDVI over the period of 1982-1999 for alpine meadow (a), temperate steppe (b), and alpine steppe (c)
图4 1982~1999年整个研究区(a)、高寒草甸(b)、高寒草原(c)和温性草原(d)不同季节平均NDVI的变化
Fig.4 Interannual variations in seasonal mean NDVI over the period of 1982-1999 for study area (a), alpine meadow (b), alpine steppe (c), and temperate steppe (d)
NDVI变化量 NDVI changing magnitude (a-1) | NDVI变化率 NDVI changing ratio (a-1) | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
生长季 Growing season | 春季 Spring | 夏季 Summer | 秋季 Autumn | 生长季 (%) Growing season | 春季 (%) Spring | 夏季 (%) Summer | 秋季 (%) Autumn | ||||
研究区域Study area | 0.001 0 | 0.001 4 | 0.001 0 | 0.000 4 | 0.41 | 0.92 | 0.37 | 0.15 | |||
高寒草甸Alpine meadow | 0.001 3 | 0.001 9 | 0.001 5 | 0.000 4 | 0.39 | 1.10 | 0.41 | 0.11 | |||
高寒草原Alpine steppe | 0.000 7 | 0.000 9 | 0.000 7 | 0.000 4 | 0.41 | 0.72 | 0.39 | 0.22 | |||
温性草原Temperate steppe | 0.001 0 | 0.001 5 | 0.000 9 | 0.000 8 | 0.42 | 0.92 | 0.35 | 0.31 |
表1 1982~1999年间不同季节NDVI的变化量和变化率
Table 1 NDVI changing magnitude and changing ratio in different season during 1982-1999
NDVI变化量 NDVI changing magnitude (a-1) | NDVI变化率 NDVI changing ratio (a-1) | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
生长季 Growing season | 春季 Spring | 夏季 Summer | 秋季 Autumn | 生长季 (%) Growing season | 春季 (%) Spring | 夏季 (%) Summer | 秋季 (%) Autumn | ||||
研究区域Study area | 0.001 0 | 0.001 4 | 0.001 0 | 0.000 4 | 0.41 | 0.92 | 0.37 | 0.15 | |||
高寒草甸Alpine meadow | 0.001 3 | 0.001 9 | 0.001 5 | 0.000 4 | 0.39 | 1.10 | 0.41 | 0.11 | |||
高寒草原Alpine steppe | 0.000 7 | 0.000 9 | 0.000 7 | 0.000 4 | 0.41 | 0.72 | 0.39 | 0.22 | |||
温性草原Temperate steppe | 0.001 0 | 0.001 5 | 0.000 9 | 0.000 8 | 0.42 | 0.92 | 0.35 | 0.31 |
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