Drip irrigation affects N2O emission differently depending on soil moisture status in an intensive vegetable production system
Year: 2021
Type: conference-abstract
Abstract: Plastic-shed vegetable production system is becoming the main type of vegetable production in China, while excessive irrigation and fertilization input lead to significant N loss by leaching, runoff, and gaseous N. The current study established a field experiment to investigate the effects of drip irrigation and optimized fertilization on vegetable yield, water and fertilizer efficiencies and N2O emission in a typical intensive plastic-shed tomato production region of China. The treatments include CK (no fertilization, flood irrigation), FFP (farmers’ conventional fertilization, flood irrigation), OPT1 (80% of FFP fertilization, flood irrigation), OPT2 (80% of FFP fertilization, drip irrigation). N2O isotopocule deltas, including δ15Nbulk, δ18O and SP (the 15N site preference in N2O), have been used to investigate microbial pathways of N2O production under different treatments. Our results showed: i) optimized fertilization and drip irrigation significantly improved the fertilizer and water use efficiency without reducing tomato yield, ii) compared with flood irrigation, drip irrigation decreased soil WFPS and soil ammonium content, but increased soil nitrate content. When soil moisture was higher than 60%WFPS, drip irrigation led to a decrease of N2O emission with lower N2O SP signature observed than that of food irrigation, suggesting a reduction of denitrification derived N2O. In contrast, drip irrigation significantly increased N2O emission and N2O SP value when soil moisture status was lower than 55% WFPS, which may be due to the enhanced nitrification or fungal denitrification derived N2O.
Institution: China Agricultural University
Language: English
Subfield: Soil Science
Domain: Life Sciences
SDGs: Zero hunger, Climate action
Open Access status: hybrid
OpenAlex ID: W3160705642