1982—2010年中国草地净初级生产力时空动态及其与气候因子的关系

发布时间：2018-04-26 06:28

本文选题：草地净初级生产力 + 时空动态　；参考：《生态学报》2017年13期

【摘要】：植被净初级生产力(NPP)及其与气候变化的响应研究是全球变化的核心内容之一。论文基于长时间序列遥感数据和气象数据,通过光能利用率模型(Carnegie-Ames-Stanford approach,CASA模型)模拟了1982—2010年中国草地NPP,进而分析其时空变化特征及其与气候水热因子的相关性。结果表明:(1)1982—2010年中国草地年平均NPP为282.0 g C m-2a-1,年总NPP的多年平均值为988.3 Tg C;空间分布上呈现东南部高西北部低的特征。(2)近30年中国草地NPP增加速率为0.6 g C m-2a-1,呈增加趋势的面积占中国草地总面积的67.2%;总体上,中国草地NPP呈极显著和显著增加的比例(35.8%、8.0%)大于呈极显著和显著减少的比例(5.8%、4.8%);NPP明显增加的区域主要包括青藏高原西部、阿拉善高原、新疆西部;明显降低的区域主要分布在内蒙古地区;不同年代际和不同草地类型的NPP变化趋势差异明显。(3)草地NPP与降水量的相关性高于与温度的相关性。不同草地类型NPP对气温、降水量的响应程度不同,其中温性荒漠草原、温性草原、温性草甸草原的NPP与降水量均达到显著正相关(P0.05)。
[Abstract]:The study of net primary productivity (NPP) and its response to climate change is one of the core contents of global change. Based on long time series remote sensing data and meteorological data, this paper simulates Chinese grassland NPP from 1982 to 2010 by using the Carnegie-Ames-Stanford approach CASA model, and then analyzes its temporal and spatial variation characteristics and its correlation with climate water and heat factors. The results showed that the average annual NPP of Chinese grassland from 1982 to 2010 was 282.0 g C m-2a-1 and the annual average of total NPP was 988.3 TG C, and the spatial distribution showed the characteristics of high, northwest and low in southeastern China.) in the last 30 years, the increasing rate of NPP in grassland of China was 0.6 g C m-2a-1. The area with an increasing trend accounts for 67.2% of the total grassland area in China; overall, The proportion of NPP in grassland of China was significant and significantly increased (35.88.0) > the proportion of 5.8b (4.8B) significantly increased in the west of Qinghai-Xizang Plateau, the Alashan Plateau, and the west of Xinjiang, the main areas of which were the western Qinghai-Xizang Plateau, the Alashan Plateau, and the Western Xinjiang. The significantly decreased area was mainly distributed in Inner Mongolia, and the correlation between NPP and precipitation was higher than that with temperature in different decadal and different grassland types. The response of NPP to temperature and precipitation was different in different grassland types. The NPP and precipitation of temperate desert steppe, temperate steppe and temperate meadow steppe were all significantly positively correlated with precipitation (P 0.05).
【作者单位】：重庆交通大学建筑与城市规划学院;西北农林科技大学水土保持研究所;南京大学生命科学学院;
【基金】：国家自然科学基金(41501575,41501202) 重庆市科委基础科学与前沿技术项目(cstc2016jcyj A1540,cstc2014jcyj A0808) 重庆交通大学博士科研启动金(14JDKJC-B017)
【分类号】：S812

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