التفاصيل البيبلوغرافية
| العنوان: |
The Effects of Agricultural Drought on Agro-ecosystem Carbon Fluxes in the North China Plains. (English) |
| المؤلفون: |
WANG Nan, GU Yu-hui, MA Xiao-yi |
| المصدر: |
China Rural Water & Hydropower; 2023, Issue 9, p75-83, 9p |
| مصطلحات موضوعية: |
AGRICULTURE, DROUGHTS, CARBON cycle, WINTER wheat, CARBON sequestration, CARBON emissions |
| مستخلص: |
Agriculture is an important part of the global ecosystem carbon cycle, which is greatly affected by drought. Therefore, understanding the impact of drought on the carbon sink intensity of agro-ecosystems helps to figure out the change regular of agro-ecosystem carbon cycle and provide a theoretical basis for realizing the control of carbon emissions. In this paper, the net ecosystem exchange (NEE) of winter wheat-summer maize rotation system in North China Plains is simulated by vegetation photosynthesis and respiration model (VPRM), and Drought Severity Index (DSI) is calculated based on evapotranspiration and normalized vegetation index to evaluate the agricultural drought intensity. The spatiotemporal response of NEE to agricultural drought is also assessed by using geographic detectors and de-trended analysis. The results show that the agricultural drought intensity in the northern part of North China Plains is more than that in the southern part of North China Plains during the growth period of winter wheat, and the agricultural drought intensity gradually decreases with the development of winter wheat. During the growth period of summer maize, North China Plains enters the rainy season and is generally wet. The carbon sequestration capacity of cropland ecosystem decreases with the increase in agricultural drought intensity, and the sensitivity of NEE of cropland ecosystem to agricultural drought is greater in the middle growth stage of winter wheat/summer maize than in the early and late growth stages. The spatial variability of agricultural drought has the largest explanatory power for NEE of winter wheat in March (q=0.68l). The explanatory power for NEE of summer maize is the highest in August (q=0.792). With the increase in agricultural drought intensity, wheat and maize fields change from strong carbon sink to weak carbon sink if grain carbon content is not considered, and finally change to carbon source if grain carbon content is considered. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
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