| 农田土壤固碳与增产协同效应研究进展 |
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| 引用本文： | 徐明岗,张旭博,孙楠,张文菊. 农田土壤固碳与增产协同效应研究进展[J]. 植物营养与肥料学报, 2017, 23(6): 1441-1449. DOI: 10.11674/zwyf.17340 |
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| 作者姓名： | 徐明岗 张旭博 孙楠 张文菊 |
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| 作者单位： | 1.中国农业科学院农业资源与农业区划研究所/耕地培育技术国家工程实验室,北京 100081 |
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| 基金项目： | 国家重点基金（41620104006）;国家重点研发计划项目（2016YFE0112700）资助。 |
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| 摘 要： | 农田土壤固碳是提升土壤肥力、保障和实现农田持续稳定生产能力的关键所在。明确农田土壤固碳与作物增产的协同效应可为不同区域土壤培肥、维持和提升作物产量提供依据。农田土壤固碳明显受到气候、土壤属性、管理措施 (尤其是施肥和耕作)、轮作制度等因素的影响,且与农田作物产量密切相关,二者具有明显的协同效应。农田土壤有机碳与作物增产协同效应存在一定的阈值,且该阈值具有一定的区域差异。东北地区土壤有机碳阈值约为C 44～46 t/hm2,西北和华北地区约为C 22～28 t/hm2,南方地区约为C 33～37 t/hm2。经验方程和模型模拟结果表明,在不同区域,农田土壤每固定C 1.0 t/(hm2·a)有机碳,粮食作物产量可平均提升约0.7 t/hm2,但该响应值在各地区明显受到相应的环境及农田管理措施等因素的影响。深入理解农田固碳过程及其与作物生产力协同作用的机理,是指导不同区域合理培肥、提高土壤肥力、提高养分资源利用效率的关键举措。未来的研究方向和重点是明确不同区域农田土壤可实现的固碳潜力,进一步揭示集约化种植下农田土壤有机碳的固存机制,关注深层土壤有机碳固定对作物增产潜力的影响及贡献,并深入分析表征环境、人为因素等对农田土壤固碳增产协同效应的影响机制及调控原理。
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| 关 键 词： | 长期试验 土壤有机碳 作物产量 协同效应 |
| 收稿时间： | 2017-08-28 |
Advance in research of synergistic effects of soil carbon sequestration on crop yields improvement in croplands |
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| XU Ming-gang,ZHANG Xu-bo,SUN Nan,ZHANG Wen-ju. Advance in research of synergistic effects of soil carbon sequestration on crop yields improvement in croplands[J]. Plant Nutrition and Fertilizer Science, 2017, 23(6): 1441-1449. DOI: 10.11674/zwyf.17340 |
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| Authors: | XU Ming-gang ZHANG Xu-bo SUN Nan ZHANG Wen-ju |
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| Affiliation: | 1.Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081, China |
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| Abstract: | Soil carbon sequestration is the key to improve soil fertility and to secure and achieve sustainable and stable crop productivity. Identifying the synergistic effects of soil carbon sequestration on crop yield improvement in agricultural soils could provide scientific basis for soil fertility improvement sustaining and improving crop productivity in different regions. In agricultural soils, soil carbon sequestration is mainly affected by climate, soil properties, management practices (especially fertilization and tillage) and cropping and rotation. Soil carbon sequestration is significantly correlated with crop productivity, showing obvious impact on crop productivity synergistically. There is an obvious threshold value of the synergistic effect of soil carbon sequestration on crop yield improvement. In addition, the threshold value of soil organic carbon varied among regions. For instance, the threshold value of soil organic carbon is approximately (ca.) C 44–46 t/hm2 for the Northeast of China, ca. C 26–28 t/hm2 for the Northwest of China, ca. C 22 t/hm2 for the North China and ca. C 35 t/hm2 for the South of China. Based on the results from empirical equations and model simulations, the magnitude of crop yields improvement by each 1.0 C t/(hm2·a) of enhanced soil carbon sequestration is averaged 0.7 t/hm2 for wheat, maize and rice yields. It indicated that the synergistic effects of soil carbon sequestration on crop productivity improvement was regulated by these relevant environmental factors and management practices. Understanding the underlying mechanisms of soil carbon sequestration process and interaction of the synergistic effects on crop productivity is important for guiding the improvement and enhancement of soil fertility, crop productivity and nutrient resource use efficiency. Future studies should be focused on identifying the attainable potential of soil carbon sequestration, further revealing the mechanisms of soil carbon sequestration under intensive cropping conditions, paying more attentions to the effects of soil carbon sequestration in deep soil on the improvement potential and contribution of crop yield, and quantifying the contributions and controlling theory of environment or anthropic practices to the interactions between soil carbon sequestration and crop yield improvement. |
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