Song Xiao-Dong, Yang Fei, Wu Hua-Yong, Zhang Jing, Li De-Cheng, Liu Feng, Zhao Yu-Guo, Yang Jin-Ling, Ju Bing, Cai Chong-Fa, Huang Biao, Long Huai-Yu, Lu Ying, Sui Yue-Yu, Wang Qiu-Bing, Wu Ke-Ning, Zhang Feng-Rong, Zhang Ming-Kui, Shi Zhou, Ma Wan-Zhu, Xin Gang, Qi Zhi-Ping, Chang Qing-Rui, Ci En, Yuan Da-Gang, Zhang Yang-Zhu, Bai Jun-Ping, Chen Jia-Ying, Chen Jie, Chen Yin-Jun, Dong Yun-Zhong, Han Chun-Lan, Li Ling, Liu Li-Ming, Pan Jian-Jun, Song Fu-Peng, Sun Fu-Jun, Wang Deng-Feng, Wang Tian-Wei, Wei Xiang-Hua, Wu Hong-Qi, Zhao Xia, Zhou Qing, Zhang Gan-Lin
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China.
Natl Sci Rev. 2021 Jul 2;9(2):nwab120. doi: 10.1093/nsr/nwab120. eCollection 2022 Feb.
Widespread soil acidification due to atmospheric acid deposition and agricultural fertilization may greatly accelerate soil carbonate dissolution and CO release. However, to date, few studies have addressed these processes. Here, we use meta-analysis and nationwide-survey datasets to investigate changes in soil inorganic carbon (SIC) stocks in China. We observe an overall decrease in SIC stocks in topsoil (0-30 cm) (11.33 g C m yr) from the 1980s to the 2010s. Total SIC stocks have decreased by ∼8.99 ± 2.24% (1.37 ± 0.37 Pg C). The average SIC losses across China (0.046 Pg C yr) and in cropland (0.016 Pg C yr) account for ∼17.6%-24.0% of the terrestrial C sink and 57.1% of the soil organic carbon sink in cropland, respectively. Nitrogen deposition and climate change have profound influences on SIC cycling. We estimate that ∼19.12%-19.47% of SIC stocks will be further lost by 2100. The consumption of SIC may offset a large portion of global efforts aimed at ecosystem carbon sequestration, which emphasizes the importance of achieving a better understanding of the indirect coupling mechanisms of nitrogen and carbon cycling and of effective countermeasures to minimize SIC loss.
大气酸沉降和农业施肥导致的广泛土壤酸化可能会极大地加速土壤碳酸盐溶解和二氧化碳释放。然而，迄今为止，很少有研究涉及这些过程。在这里，我们使用荟萃分析和全国调查数据集来研究中国土壤无机碳（SIC）储量的变化。我们观察到，从20世纪80年代到21世纪10年代，表层土壤（0-30厘米）的SIC储量总体下降（11.33克碳/平方米/年）。SIC总储量下降了约8.99±2.24%（1.37±0.37Pg C）。中国全国范围内（0.046Pg C/年）和农田（0.016Pg C/年）的SIC平均损失分别占陆地碳汇的约17.6%-24.0%和农田土壤有机碳汇的57.1%。氮沉降和气候变化对SIC循环有深远影响。我们估计，到2100年，约19.12%-19.47%的SIC储量将进一步损失。SIC的消耗可能会抵消全球在生态系统碳固存方面的大部分努力，这凸显了更好地理解氮和碳循环的间接耦合机制以及采取有效对策以尽量减少SIC损失的重要性。
