气候变化领域集成服务门户(CCPortal): Dynamics of Carbon and Water Fluxes over Cropland and Agroforest Ecosystems on the Southern Chinese Loess Plateau

CCPortal

DOI	10.3390/f15050774
	Dynamics of Carbon and Water Fluxes over Cropland and Agroforest Ecosystems on the Southern Chinese Loess Plateau
	Han, Xiaoyang; Fang, Fengru; Bai, Chenyun; Du, Kang; Zhu, Yuanjun; Liu, Wenzhao
发表日期	2024
EISSN	1999-4907
起始页码	15
结束页码	5
卷号	15 期号:5
英文摘要	Studies on the spatiotemporal dynamics in ecosystem carbon and water exchanges are essential in predicting the effects of climate change on regional carbon and energy budgets. Using the eddy covariance technique, carbon and water fluxes were observed in a typical winter wheat ecosystem (WWE) and an agroforest ecosystem (AFE) in the southern Loess Plateau from 2004 to 2010. The seasonal and inter-annual variability in gross primary productivity (GPP), net ecosystem exchange (NEE), evapotranspiration (ET), and water use efficiency (WUE) were examined and the main influencing factors were identified using the Pearson correlation. The results indicate that the seasonal GPP and NEE showed a bimodal distribution in WWE, while this was unimodal in AFE. The sinusoidal function did well in the characterization of seasonal ET dynamics for both ecosystems, with the determination coefficients being 0.85 and 0.94, respectively. In WWE and AFE, the annual mean GPP were 724.33 and 723.08 g C m-2 a-1, respectively, and the corresponding ET were 392.22 and 410.02 mm a-1. However, the difference in NEE between the two ecosystems was obvious, NEE were -446.28 and -549.08 g C m-2 a-1, respectively, showing a stronger carbon sink in AFE. There were strong coupling relationships between the GPP and ET of both ecosystems; the overall slopes were 1.71 and 1.69, respectively. The seasonal trend of WUE was bimodal in WWE, with peak values of 3.94 and 3.65 g C kg-1 H2O, occurring in November and April, respectively. However, the monthly WUE in AFE had one single peak of 4.07 g C kg-1 H2O in January. Photosynthetically active radiation (PAR) and soil temperature (Ts) were most positively correlated with GPP, net radiation (Rn) and Ts were the major factors influencing ET, while vapor pressure deficit (VPD) and soil water content (SWC) were the major influencing factors for WUE. These results provide observational support for regional carbon neutrality simulations.
英文关键词	eddy covariance system; carbon-water fluxes; structural equation model; water use efficiency; loess tableland
语种	英语
WOS研究方向	Forestry
WOS类目	Forestry
WOS记录号	WOS:001232302600001
来源期刊	FORESTS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/305531
作者单位	Northwest A&F University - China; Chinese Academy of Sciences; Institute of Soil & Water Conservation (ISWC), CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS
推荐引用方式 GB/T 7714	Han, Xiaoyang,Fang, Fengru,Bai, Chenyun,et al. Dynamics of Carbon and Water Fluxes over Cropland and Agroforest Ecosystems on the Southern Chinese Loess Plateau[J],2024,15(5).
APA	Han, Xiaoyang,Fang, Fengru,Bai, Chenyun,Du, Kang,Zhu, Yuanjun,&Liu, Wenzhao.(2024).Dynamics of Carbon and Water Fluxes over Cropland and Agroforest Ecosystems on the Southern Chinese Loess Plateau.FORESTS,15(5).
MLA	Han, Xiaoyang,et al."Dynamics of Carbon and Water Fluxes over Cropland and Agroforest Ecosystems on the Southern Chinese Loess Plateau".FORESTS 15.5(2024).