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DOI	10.2112/SI80-007.1
	Spatial-Temporal Variation Characteristics of NPP in the Heihe River Basin, Northwestern China, in a Recent 10-Year Period Calculated by CASA Model
	Liu, Wei; Feng, Qi; Zhang, Fuping
发表日期	2017
ISSN	0749-0208
EISSN	1551-5036
英文摘要	In this paper, the spatial-temporal variation characteristics of NPP and related factors in the Heihe River basin were analyzed using the meteorological data of the Heihe River basin, SPOT/NDVI data, and other modified mathematical statistical methods. The results show that during the 1999-2010 period the total NPP in the Heihe River basin exhibited a fluctuating increasing trend, reaching 0.3x10(12) gC/a. The multiyear variation value of NPP was 0.19 similar to 601.09 gC/m(2)/a in the whole basin, 3.5 gC/m(2)/a in the upper reaches, 2.06 gC/m(2)/a in the middle reaches, and 0.31 g/m(2)/a in the lower reaches. The NPP of vegetation in the Heihe River basin during January and February tended to slightly decrease, and on average varied between -0.01 and -0.02 gC/m(2)/a, while in June, July, August, and September greatly increased. The NPP of 10 vegetation types exhibited an increasing trend in 2010 compared to 1999, on average increased by 21.02 gC/m(2)/a. Among various vegetation types the increase in the NPP value of swamp vegetation was the largest, reaching 46.24 gC/m(2)/a followed by planted vegetation, steppe types, and meadow types; there values were 39.22 gC/m(2)/a, 32.49 gC/m(2)/a, and 27.63 gC/m(2)/a, respectively. The accumulated NPP in grassland ecosystem in the Heihe River basin was the largest, which is of important significance to the eco-environment of the basin. As viewed for the whole Heihe River basin, the yearly mean cumulative value of NPP of vegetation was negatively related to annual mean temperature and annual total solar radiation but positively related to annual total precipitation, suggesting that water is a limiting factor to the NPP in the Heihe River basin.
关键词	NPP NDVI climate changes eco-environment Heihe River basin
学科领域	Environmental Sciences & Ecology; Physical Geography; Geology
语种	英语
WOS研究方向	Environmental Sciences ; Geography, Physical ; Geosciences, Multidisciplinary
来源期刊	JOURNAL OF COASTAL RESEARCH
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/111925
作者单位	Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Liu, Wei,Feng, Qi,Zhang, Fuping. Spatial-Temporal Variation Characteristics of NPP in the Heihe River Basin, Northwestern China, in a Recent 10-Year Period Calculated by CASA Model[J]. 中国科学院西北生态环境资源研究院,2017.
APA	Liu, Wei,Feng, Qi,&Zhang, Fuping.(2017).Spatial-Temporal Variation Characteristics of NPP in the Heihe River Basin, Northwestern China, in a Recent 10-Year Period Calculated by CASA Model.JOURNAL OF COASTAL RESEARCH.
MLA	Liu, Wei,et al."Spatial-Temporal Variation Characteristics of NPP in the Heihe River Basin, Northwestern China, in a Recent 10-Year Period Calculated by CASA Model".JOURNAL OF COASTAL RESEARCH (2017).