Divergent hydrological response to large-scale afforestation and vegetation greening in China.
Divergent hydrological response to large-scale afforestation and vegetation greening in China.
复制标题
DOI：
10.1126/sciadv.aar4182
复制
发表时间：
2018-05
期刊：
影响因子：
13.6
通讯作者：
Zhou L
中科院分区：
文献类型：
--
作者：
Li Y;Piao S;Li LZX;Chen A;Wang X;Ciais P;Huang L;Lian X;Peng S;Zeng Z;Wang K;Zhou L
我们发现，中国30年的造林和植被绿化的水文响应具有高度的空间异质性。自1980年代以来，中国的植被覆盖发生了巨大变化，叶面积指数增加了10%，森林面积增加了约4 150万公顷。早期的研究表明，叶面积和树木覆盖的增加导致了土壤水分和径流的下降，这是由于蒸散量（ET）增加，特别是在中国干旱地区。然而，这些研究往往忽略了降水对植被增加的响应，这可能会抵消ET增加对土壤水分的一些负面影响。我们调查了30年的植被对区域水文的影响，允许植被引起的降水变化，使用耦合的陆-气全球气候模式，具有较高的空间分辨率缩放网格在中国。我们发现，中国各地的植被对关键水文变量的影响具有高度的空间异质性。在华北和东南部，植被绿化和森林面积的增加虽然在统计上不显著，但提供了足够的水分来抵消ET的增加，对土壤水分的影响很小。在中国西南地区，植被覆盖的增加显著降低了土壤湿度，而降水则受到减弱的夏季风的抑制。在中国东北，唯一一个森林覆盖率下降的地区，土壤湿度显著减少，每10年减少-8.1毫米，这可能是因为夏季反气旋环流异常增强。这些结果表明，离线模式模拟可能高估了土壤干燥度的增加，在中国北方造林，如果植被反馈导致降水增加，像我们的研究。
We found high spatial heterogeneity in the hydrological response to 30-year afforestation and vegetation greening in China. China has experienced substantial changes in vegetation cover, with a 10% increase in the leaf area index and an ~41.5 million-hectare increase in forest area since the 1980s. Earlier studies have suggested that increases in leaf area and tree cover have led to a decline in soil moisture and runoff due to increased evapotranspiration (ET), especially in dry regions of China. However, those studies often ignored precipitation responses to vegetation increases, which could offset some of the negative impact on soil moisture by increased ET. We investigated 30-year vegetation impacts on regional hydrology by allowing for vegetation-induced changes in precipitation using a coupled land-atmosphere global climate model, with a higher spatial resolution zoomed grid over China. We found high spatial heterogeneity in the vegetation impacts on key hydrological variables across China. In North and Southeast China, the increased precipitation from vegetation greening and the increased forest area, although statistically insignificant, supplied enough water to cancel out enhanced ET, resulting in weak impact on soil moisture. In Southwest China, however, the increase in vegetation cover significantly reduced soil moisture while precipitation was suppressed by the weakened summer monsoon. In Northeast China, the only area where forest cover declined, soil moisture was significantly reduced, by −8.1 mm decade−1, likely because of an intensified anticyclonic circulation anomaly during summer. These results suggest that offline model simulations can overestimate the increase of soil dryness in response to afforestation in North China, if vegetation feedbacks lead to increased precipitation like in our study.
登录
查看更多内容
影响因子：
5.2
作者：
DICKINSON, RE;KENNEDY, P
通讯作者：
KENNEDY, P
1950-2000年东亚夏季风对历史海温和大气强迫的响应
影响因子：
4.6
作者：
Li, Hongmei;Dai, Aiguo;Lu, Jian
通讯作者：
Lu, Jian
影响因子：
8.9
作者：
Kosaka, Y.;Nakamura, H.
通讯作者：
Nakamura, H.
影响因子：
5.2
作者：
Li, Yue;Yang, Hui;Piao, Shilong
通讯作者：
Piao, Shilong
DOI：
10.1007/s11632-012-0108-3
发表时间：
2012-01-01
期刊：
Forestry Studies in China
影响因子：
--
作者：
Li MiaoMiao, Li MiaoMiao;Liu AnTian, Liu AnTian;Wang, K. Y.
通讯作者：
Wang, K. Y.