干旱区生态环境知识资源中心(Arid): 19822010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

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	19822010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
其他题名	Spatio-temporal dynamics of grassland net primary productivity and their relationship with climatic factors from 1982 to 2010 in China
	周伟 1; 牟凤云 1; 刚成诚 2; 官冬杰 1; 何锦峰 1; 李建龙 3
来源期刊	生态学报
ISSN	1000-0933
出版年	2017
卷号	37 期号:13 页码:4335-4345
中文摘要	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19822010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) 19822010年中国草地年平均NPP为282.0 gC m~(-2)a~(-1),年总NPP的多年平均值为988.3 TgC;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 gC m~(-2)a~(-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(P<0.05)。
英文摘要	Global warming has led to significant vegetation changes in the past half century. Grasslands in China are mainly located in ecologically fragile regions, which are sensitive to climate change. During recent decades, grasslands have experienced prominent warming and drying. Therefore, investigating the response of grasslands to climatic variations is necessary for a better understanding of the cumulative consequences of climate change. Grassland net primary productivity(NPP) is an important indicator for evaluating grassland ecosystem conditions. We used multi-source remote-sensing data and meteorological data to estimate the grassland NPP from 1982 to 2010,based on the Carnegie-Ames-Stanford approach(CASA) model. The spatial pattern and change trends of grassland NPP were evaluated. The response of grassland NPP changes to climatic variations was also analyzed. The results revealed that the spatial distribution of grassland NPP showed an increasing trend from the northwest to southeast across China. During the period from 1982 to 2010,the grassland mean NPP was 282 gC m~(-2)a~(-1),and NPP exhibited apparent spatial heterogeneity, being highest (710 gC m~(-2)a~(-1)) in the dry heat savanna shrub and grass and lowest (58 gC m~(-2)a~(-1)) in the alpine desert. The total annual NPP was 988.3 Tg C. Grassland NPP has increased slightly in the past 30 years, at a rate of 0.6 gC m~(-2)a~(-1). Regions showing increasing NPP accounted for 67.2% of the total grassland areas, within which, areas with extremely significant (P<0.01) and significant (P<0.05) increases accounted for 35.8% and 8.0% of the total grassland area, respectively. Regions showing extremely significant and significant decreases encompassed only 5.8% and 4.8% of total grassland area, respectively. Clear increases in grassland NPP were observed in the west of the Qinghai-Tibet Plateau,the Alxa Plateau and western area of Xinjiang. Areas with a decrease in grassland NPP were mainly distributed in the western regions of Inner Mongolia. Furthermore, the increasing rate of NPP showed temporal variation and differed among different grassland types. The correlation coefficient between NPP and precipitation was larger than that between NPP and temperature. Moreover, the response of grassland NPP to temperature and precipitation differed for different grassland types. There were significant positive correlations between annual precipitation and NPP in temperate desert steppe, temperate steppe, and temperate meadow steppe.
中文关键词	草地净初级生产力 ; 时空动态 ; 气温 ; 降水量 ; 耦合关系分析
英文关键词	grassland net primary productivity spatio-temporal dynamics temperature precipitation the coupling relation analysis
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:6024134
来源机构	西北农林科技大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/236488
作者单位	1.重庆交通大学,建筑与城市规划学院, 重庆 400074, 中国; 2.西北农林科技大学,水土保持研究所, 杨凌, 712100; 3.南京大学,生命科学学院, 南京, 江苏 210093, 中国
推荐引用方式 GB/T 7714	周伟,牟凤云,刚成诚,等. 19822010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[J]. 西北农林科技大学,2017,37(13):4335-4345.
APA	周伟,牟凤云,刚成诚,官冬杰,何锦峰,&李建龙.(2017).19822010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.生态学报,37(13),4335-4345.
MLA	周伟,et al."19822010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".生态学报 37.13(2017):4335-4345.