干旱区生态环境知识资源中心(Arid): 中国西北部草地植被降水利用效率的时空格局

Arid

	中国西北部草地植被降水利用效率的时空格局
其他题名	Spatio-temporal patterns of precipitation-use efficiency of grassland in Northwestern China
	穆少杰; 游永亮; 朱超; 周可新
来源期刊	生态学报
ISSN	1000-0933
出版年	2017
卷号	37 期号:5 页码:1458-1471
中文摘要	植被降水利用效率(PUE)是评价干旱、半干旱地区植被生产力对降水量时空动态响应特征的重要指标。利用光能利用率CASA (Carnegie-Ames-Stanford Approach)模型估算了20012010年中国西北七省草地植被净初级生产力(NPP),结合降水量的空间插值数据,分析了近十年草地植被PUE的空间分布、主要植被类型的PUE,及其时空格局的驱动因素。结果表明:(1)2001-2010年西北七省草地植被的平均PUE为0.68 g C m~(-2) mm~(-1)。在温带草地各类型中,PUE的大小顺序为草甸草原>灌丛>典型草原>荒漠草原>荒漠,各类型草地PUE之间差异显著;对于高寒草地而言,高寒草原的PUE显著高于高寒草甸;(2)温带草地PUE的空间分布与年降水量的关系呈抛物线形状(R~2 = 0.65,P<0.001),PUE峰值出现在年降水量P = 472.9 mm的地区;荒漠地区植被PUE的空间分布与年降水量的关系同样呈抛物线形状(R~2 = 0.63,P<0.001),PUE峰值出现在年降水量P=263.2 mm的地区;对于高寒草地而言,年降水量100 mm以下地区植被PUE变异较大,年降水量大于100 mm的地区植被PUE的空间分布随降水量的变化呈抛物线形状(R~2=0.47,P<0.001),PUE峰值出现在P= 559.2 mm的地区;(3)不同降水量区域,植被PUE的年际波动与气候因子的关系也有较大差别。在年降水量为2001000 mm的地区,草地PUE的年际波动与年降水量的变化呈正相关;在年降水量高于1050 mm的地区,草地PUE的年际波动与年均温的相关性较强,相关系数最高可达到0.4。
英文摘要	Precipitation-use efficiency (PUE) is an important indicator used to determine how net primary productivity (NPP) responds to variation in precipitation, especially in arid and semi-arid ecosystems. The objective of this study was to determine the spatio-temporal patterns of PUE and its response to climatic factors along the precipitation gradient. The Carnegie-Ames-Stanford Approach (CASA) model was employed to simulate NPP in Inner Mongolia during 20012010 based on MOD13A1 data and spatially interpolated meteorological data. PUE was calculated as the ratio of NPP to annual precipitation. The results showed that: (1) The multi-year average PUE of grassland in Northwestern China was 0.68 g C m~(-2) mm~(-1). Among various type of temperate grassland, meadow steppe had the highest PUE, whereas the lowest PUE was found for desert. Furthermore, there were significant differences between the PUE of different grassland types. For the alpine grassland, alpine steppe had a higher PUE than alpine meadow. (2) Spatially, the PUE of temperate grassland increased first, peaking at ~472.9 mm/a, and then decreased with the precipitation gradient (R~2 =0.65,P<0.001). The relationship between desert PUE and precipitation followed a similar trend (R~2 =0.63,P<0.001),in which the highest PUE was found in the regions with annual precipitation of 263.2 mm. For the alpine meadow,PUE was low at both the dry (> 100 mm) and the wet ends of the annual precipitation gradient,and peaked around 559.2 mm (R~2 = 0.47,P < 0.001). (3) Temporally, the inter-annual variation of PUE also responded differently to climatic factors in different precipitation ranges. In the area with precipitation of 2001000 mm,PUE was positively correlated with precipitation. For the regions where precipitation was higher than 1050 mm,temperature had much greater effects than precipitation on the inter-annual variations of PUE.
中文关键词	降水利用效率 ; 植被覆盖度 ; 温带草地 ; 高寒草地 ; 概念模型
英文关键词	precipitation-use efficiency (PUE) fraction of vegetation cover (FVC) temperate grassland,alpine grassland conceptual model
类型	Article
语种	中文
国家	中国
收录类别	CSCD
WOS类目	Life Sciences & Biomedicine - Other Topics
WOS研究方向	Life Sciences & Biomedicine - Other Topics
CSCD记录号	CSCD:5944449
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/236450
作者单位	穆少杰, 环境保护部南京环境科学研究所, 南京, 江苏 210042, 中国.; 朱超, 环境保护部南京环境科学研究所, 南京, 江苏 210042, 中国.; 周可新, 环境保护部南京环境科学研究所, 南京, 江苏 210042, 中国.; 游永亮, 河北省农林科学院旱作农业研究所, 衡水, 河北 053000, 中国.
推荐引用方式 GB/T 7714	穆少杰,游永亮,朱超,等. 中国西北部草地植被降水利用效率的时空格局[J],2017,37(5):1458-1471.
APA	穆少杰,游永亮,朱超,&周可新.(2017).中国西北部草地植被降水利用效率的时空格局.生态学报,37(5),1458-1471.
MLA	穆少杰,et al."中国西北部草地植被降水利用效率的时空格局".生态学报 37.5(2017):1458-1471.