College of Agronomy, Ningxia University, Yinchuan, Ningxia, China.
Yinchuan Provincial Sub-branch, The People's Bank of China, Yinchuan, Ningxia, China.
PLoS One. 2018 Sep 5;13(9):e0199846. doi: 10.1371/journal.pone.0199846. eCollection 2018.
The idea of mitigating anthropogenic CO2 emissions by increasing soil organic carbon (SOC) is notable. However, the estimation of the net ecosystem carbon balance after conversion from conventional tillage to conservational tillage has been poorly quantified for the Loess Plateau in China. A 2-year field experiment was conducted to estimate the agroecosystem carbon balance of a winter wheat-summer maize rotation system using a full carbon cycle analysis. The results showed that a positive net ecosystem carbon balance value in the cases of rotary tillage with straw incorporation, chisel plow tillage with straw incorporation, and no tillage with straw mulching treatments. Note that a negative value was detected for the conventional moldboard plowing tillage without crop straw treatment. The conversion from conventional tillage to conservational tillage substantially enhanced the carbon sink potential from 0.84 t C ha-1 yr-1 to 2.69 t C ha-1 yr-1 in both years. Our findings suggest that the expansion of conservational tillage could enhance the potential carbon sink of the rain-fed land in China.
通过增加土壤有机碳（SOC）来减轻人为 CO2 排放的想法值得注意。然而，对于中国黄土高原，从传统耕作向保护性耕作的转换对净生态系统碳平衡的估计还没有得到很好的量化。本研究通过采用全碳循环分析进行了为期 2 年的田间试验，以估算冬小麦-夏玉米轮作系统的农业生态系统碳平衡。结果表明，旋耕秸秆还田、凿式犁耕秸秆还田和免耕秸秆覆盖处理的净生态系统碳平衡值为正值。而传统翻耕无秸秆处理的净生态系统碳平衡值为负值。与传统耕作相比，保护性耕作在两年中分别将碳汇潜力从 0.84 t C ha-1 yr-1 提高到 2.69 t C ha-1 yr-1。本研究结果表明，保护性耕作的推广可以提高中国雨养土地的潜在碳汇。
