Recent change of vegetation growth trend in China
Recent change of vegetation growth trend in China
复制标题
我国植被生长趋势近期变化
DOI：
10.1088/1748-9326/6/4/044027
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发表时间：
2011-10-01
影响因子：
6.7
通讯作者：
Piao, Shilong
中科院分区：
文献类型：
--
作者：
Peng, Shushi;Chen, Anping;Piao, Shilong
利用卫星导出的归一化差异植被指数（NDVI）数据，以前的几项研究表明，植被生长显着增加，在中国大部分地区在1982-99年期间。在这封信中，我们将研究期限延长至2010年。研究发现，在全国范围内，生长季（4 - 10月）的NDVI在1982 - 2010年间显著增加了0.0007 yr（-1），但与1982- 1999年相比，近10年的增长趋势有所下降。NDVI的变化趋势表现出明显的季节和空间差异。4月和5月（AM）的NDVI增长趋势（0.0013 yr（-1））大于6月、7月和8月（JJA）（0.0003 yr（-1））和9月和10月（SO）（0.0008 yr（-1））。与1982-99年（0.0012 yr（-1））相比，1982-2010年JJA NDVI的这种相对较小的增长趋势（Piao et al 2003 J. Geophys.保留-大气层。108 4401）表明JJA植被的生长趋势发生了变化，在1988年由显著的增长（0.0039 yr（-1））转为略有下降（0：0002 yr（-1））。从空间格局来看，1982 - 2010年，中国南方生长季NDVI呈上升趋势（超过0.0020 yr（-1）），而北方变化接近于零，这是20世纪90年代和21世纪初发生的显著变化趋势逆转的结果。在北方，由于气候变暖和降水增加，生长季NDVI在20世纪90年代以前显著增加，但在20世纪90年代以后，由于气候变暖和降水减少，干旱胁迫加剧，生长季NDVI下降。我们的研究结果还表明，植被生长对气候变化的响应在不同的季节和生态系统中存在差异。
Using satellite-derived normalized difference vegetation index (NDVI) data, several previous studies have indicated that vegetation growth significantly increased in most areas of China during the period 1982-99. In this letter, we extended the study period to 2010. We found that at the national scale the growing season (April-October) NDVI significantly increased by 0.0007 yr(-1) from 1982 to 2010, but the increasing trend in NDVI over the last decade decreased in comparison to that of the 1982-99 period. The trends in NDVI show significant seasonal and spatial variances. The increasing trend in April and May (AM) NDVI (0.0013 yr(-1)) is larger than those in June, July and August (JJA) (0.0003 yr(-1)) and September and October (SO) (0.0008 yr(-1)). This relatively small increasing trend of JJA NDVI during 1982-2010 compared with that during 1982-99 (0.0012 yr(-1)) (Piao et al 2003 J. Geophys. Res.-Atmos. 108 4401) implies a change in the JJA vegetation growth trend, which significantly turned from increasing (0.0039 yr(-1)) to slightly decreasing (0 : 0002 yr(-1)) in 1988. Regarding the spatial pattern of changes in NDVI, the growing season NDVI increased (over 0.0020 yr(-1)) from 1982 to 2010 in southern China, while its change was close to zero in northern China, as a result of a significant changing trend reversal that occurred in the 1990s and early 2000s. In northern China, the growing season NDVI significantly increased before the 1990s as a result of warming and enhanced precipitation, but decreased after the 1990s due to drought stress strengthened by warming and reduced precipitation. Our results also show that the responses of vegetation growth to climate change vary across different seasons and ecosystems.