| 摘要: |
| 为明确秸秆还田对土壤有机碳的影响，构建合理的碳库管理策略，收集整理1992—2018年已发表的文献数据，以Meta-analysis方法定量分析秸秆还田对中国农田土壤有机碳含量的影响，并系统解析其影响因素。结果表明:整体上，与秸秆不还田相比，秸秆还田可显著增加土壤有机碳的含量，但不同区域土壤有机碳增加幅度有一定的差异。华东地区土壤有机碳增幅最高，显著增加14.6%，华中地区增幅最低，为7.7%(P<0.05)；华东、西北和西南地区高于全国12.1%的平均水平(未包括港澳台地区，下同)，而东北、华北和华中地区低于全国平均水平。不同土层有机碳含量对秸秆还田的响应也表现出一定的差异，秸秆还田对0~10 cm土层土壤有机碳含量的增加效应达11.2%，而对>40 cm土层(最深达100 cm)的增加效应仅为3.9%(P<0.05)。此外，试验区域的年均气温、施氮量、土地利用类型以及还田年限等均对秸秆还田下有机碳含量有不同程度的影响。本研究表明，较长的还田年限(6~10年)、适当的耕作措施(免耕结合旋耕翻耕等)和适当的氮肥施用量(120~240 kg/hm2)等条件均能有效提升秸秆还田的固碳潜力。 |
| 关键词: 气候变化 秸秆还田 土壤有机碳 Meta分析 碳库管理 |
| DOI：10.11841/j.issn.1007-4333.2020.08.02 |
| 投稿时间：2019-10-28 |
| 基金项目:国家公益性行业(农业)科研专项(201503136)；国家级大学生创新训练项目(201910019003) |
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| Residue returning induced changes in soil organic carbon and the influential factors in China's croplands: A meta-analysis |
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WANG Xudong1,ZHUANG Junjie1,LIU Bingyang1,LI Shuaishuai1,ZHAO Xin1,LIU Yang2,ZHANG Hailin 1*
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| (1.College of Agronomy and Biotechnology/Key Laboratory of Farming System of Ministry of Agriculture andRural Affairs, China Agricultural University, Beijing 100193, China;2.Tillage and Cultivation Research Insitute, Liaoning Academy of Agriculture Sciences, Shenyang 110161, China) |
| Abstract: |
| Soil organic carbon(SOC)pool is important for improving soil quality and crop productivity as well as for climate change mitigation. Crop residue returning(RR)is considered as sustainable agriculture technology with high efficiency and environmental protection. Therefore, understanding the effect of RR on SOC is of great significance to establish a suitable carbon pool management strategy and to realize the SOC sequestration potential. This study aimed to reveal the effects of RR on SOC and to determine the SOC sequestration influencing factors in China's croplands. Based on peer-reviewed papers from 1992-2018, a meta-analysis was conducted to assess the effects of RR on SOC. The results showed certain differences in SOC contents under RR. Specifically, RR significantly increased SOC contents by 14. 6% in the Eastern China, which was the highest value in all regions(P<0. 05). And 7. 7% increment of SOC was observed in the Central China, which was the lowest value in all regions(P<0. 05). In addition, the significant effects of RR on SOC were noted in Northwest and Southwest China, which were more than the national average(12. 1%, P<0. 05). Less effects were observed in Northeast and North China than the national average. The responses of SOC contents to RR in different soil depths were highly variable. RR significantly enhanced SOC by 11. 2% in 0-10 cm soil depths, but only increased by 3. 9% in 40 cm soil depth and below(>40 cm, as deep as 100 cm)(P<0. 05). Besides, the mean annual temperature, nitrogen fertilization, land-use type and consecutive years of RR were observed to change the responses of SOC contents to RR. Notably, RR can significantly increase SOC content, optimized RR based field management practices with suitable tillage practices(no-till, plow tillage and rotary tillage), suitable experimental duration(6 -10 a)and low nitrogen fertilizer input(120-240 kg/hm2)can enhance the SOC sequestration potential. |
| Key words: climate change residue returning soil organic carbon meta-analysis carbon pool management |
