Peng Xiongbiao, Ma Jing, Cai Huanjie, Wang Yunfei
Key Laboratory for Agricultural Soil and Water Engineering in Arid Area of Ministry of Education, Northwest A&F University, Yangling, China.
Institute of Water Saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling, China.
J Sci Food Agric. 2023 Mar 15;103(4):1761-1774. doi: 10.1002/jsfa.12317. Epub 2022 Nov 22.
Quantifying the carbon balance of agroecosystems and clarifying the factors controlling it are essential for estimating the regional carbon cycle and global carbon balance.
Based on the eddy covariance (EC) technique and soil respiration observations during the 2017 and 2019 summer maize growing seasons, this study analyzed the carbon balance and revealed the factors controlling carbon fluxes in the summer maize agroecosystem. Green leaf area index was the most important factor affecting net ecosystem exchange (NEE), total primary productivity, and total ecosystem respiration (TER) in the rapid development stage during the growing season, followed by soil water content. However, precipitation, air temperature, relative humidity, saturated vapor pressure difference, and photosynthetically active radiation were the main factors that influenced carbon balance at the middle stage. The cumulative TER in 2019 was 40% (320.9 g C m ) higher than that in 2017. The NEE estimates of summer maize agroecosystems in 2017 and 2019 were -71.7 and 160.4 g C m , respectively. Accounting for the carbon input at sowing (10 g C m ) and the similar carbon output at harvest owing to grain removal, the net biome productivity in 2019 was 1.75 times that in 2017, at -636 and -363 g C m , respectively.
The carbon balance of the summer maize agroecosystem in the Guanzhong Plain was determined to be a net carbon source that could export carbon at an average rate of 499.5 g C m yr . © 2022 Society of Chemical Industry.
量化农业生态系统的碳平衡并阐明控制其的因素对于估算区域碳循环和全球碳平衡至关重要。
基于涡度相关（EC）技术以及2017年和2019年夏玉米生长季的土壤呼吸观测数据，本研究分析了碳平衡，并揭示了夏玉米农业生态系统中控制碳通量的因素。绿叶面积指数是生长季快速发育阶段影响净生态系统交换量（NEE）、总初级生产力和总生态系统呼吸量（TER）的最重要因素，其次是土壤含水量。然而，降水量、气温、相对湿度、饱和水汽压差和光合有效辐射是影响中期碳平衡的主要因素。2019年的累积TER比2017年高40%（320.9 g C m²）。2017年和2019年夏玉米农业生态系统的NEE估算值分别为-71.7和160.4 g C m²。考虑到播种时的碳输入（10 g C m²）以及收获时因籽粒移除而相似的碳输出，2019年的净生物群系生产力是2017年的1.75倍，分别为-636和−363 g C m²。
关中平原夏玉米农业生态系统的碳平衡被确定为净碳源，其平均每年能够以499.5 g C m²的速率输出碳。© 2022化学工业协会。
