College of Water Conservancy, Shenyang Agricultural University, Shenyang, P.R. China.
College of Mechanical and Electrical Engineering, Tarim University, Alar, P.R. China.
Environ Monit Assess. 2024 Sep 7;196(10):905. doi: 10.1007/s10661-024-13059-2.
The apple orchards in Liaoning, one of the four major apple-producing areas in Bohai Bay, Northeast China, play a crucial role in regulating the carbon sink effect. However, there is limited information on the variation in carbon flux and its influential factors in apple orchards in this region. To address this, CO flux data were monitored throughout the entire apple growth seasons from April to November in 2017 and 2018 in the apple (Malus pumila Mill. cv Hanfu) orchard in Shenyang, China. The energy closure of the apple orchard was calculated, and variations in net ecosystem exchange (NEE) at different time scales and its response to environmental factors were analyzed. Our results showed that the energy balance ratio of the apple was 0.74 in 2017 and 1.38 in 2018. NEE was generally positive in April and November and negative from May to October, indicating a strong carbon sink throughout the growth season. The daily average NEE ranged from - 0.103 to 0.094 mg m s in 2017 and from - 0.134 to 0.059 mg m s in 2018, with the lowest values observed in June and July. NEE was negatively correlated with net radiation, atmospheric temperature, saturated vapor pressure deficit, and soil temperature. These findings provide valuable insights for predicting carbon flux in orchard ecosystems within the context of global climate change.
辽宁是中国渤海湾四大苹果产区之一，其果园在调节碳汇效应方面起着至关重要的作用。然而，关于该地区苹果园碳通量的变化及其影响因素的信息有限。为了解决这个问题，我们在 2017 年和 2018 年的 4 月至 11 月期间，对中国沈阳的苹果（Malus pumila Mill. cv Hanfu）园中整个苹果生长季的 CO2 通量数据进行了监测。计算了苹果园的能量闭合，分析了不同时间尺度上的净生态系统交换（NEE）变化及其对环境因素的响应。结果表明，2017 年和 2018 年苹果的能量平衡比分别为 0.74 和 1.38。4 月和 11 月的 NEE 通常为正，5 月至 10 月为负，表明整个生长季都有很强的碳汇。2017 年的日平均 NEE 范围为-0.103 至 0.094mgm-2s-1，2018 年为-0.134 至 0.059mgm-2s-1，6 月和 7 月的 NEE 值最低。NEE 与净辐射、大气温度、饱和水汽压亏缺和土壤温度呈负相关。这些发现为预测全球气候变化背景下果园生态系统的碳通量提供了有价值的见解。
