摘要
农田生态系统在全球碳循环中具有突出地位,研究农田生态系统碳循环过程、掌握地区碳收支情况,对挖掘农田多功能性、发展低碳农业具有重要意义,同时为制定农业生态补偿提供依据。本文综合分析农田生态系统碳循环过程,并根据实际情况修正核算了碳排放系数,从碳输入、碳输出、固碳三个过程对曲周县农田生态系统碳源和碳汇以及碳效率进行研究。结果表明,2011年曲周县农田生态系统碳平衡值为-3.30万t,当年可固定碳17.61万t。土壤呼吸、农用机械以及氮肥、磷肥的使用是造成碳排的主要因素。各乡镇农田生态系统碳源和碳汇情况有所差异,曲周镇等乡镇由于高投入低产出导致当年系统为碳源,而候村镇、河南疃镇等乡镇由于低投入、高产出导致当年系统为碳汇。曲周县农田生态系统虽整体表现为碳源,但仍具有较强的碳汇能力以及较高的碳效率,在一定程度上可弥补碳排放对环境造成的影响。
Given the vital role that farmland ecosystems play in the global carbon cycle,it is of great significance to study carbon cycles and the regional balance of carbon. Studies of this nature contribute to diversity and providing references when developing low- carbon agriculture and establishing eco-compensation systems. We comprehensively analyzed farmland ecosystem carbon cycles and corrected some carbon emission coefficients based on actual conditions. From the perspective of carbon input,carbon output and fixed carbon,parameters for carbon source/sink and carbon efficiency were calculated. Results show that the carbon balance value of farmland ecosystems was- 3.30 × 10^4 t and the carbon was fixed at a level of 17.61 × 10^4 t in 2011. Soil respiration and some human productive activities including utilization of nitrogen fertilizer,farm machinery and phosphate fertilizer were the main factors in carbon emission. When analyzing the condition of carbon source in each township in Quzhou,we found that during low output and high input,the farmland ecosystem of Quzhou appeared as a carbon source. On the contrary,the farmland ecosystem of Houcun,Henan Tuan and other towns were a carbon sink on account of low input and high output. In conclusion,farmland ecosystems in Quzhou country show remarkable carbon sequestration capacity and relatively high carbon efficiency,despite the overall performance of a carbon source. To some extent,this can function as compensation for some of the negative effects of carbon emissions on the environment.
出处
《资源科学》
CSSCI
CSCD
北大核心
2016年第5期918-928,共11页
Resources Science
基金
国家科技支撑计划项目":环渤海经济区基本农田建设技术研究与示范"(2015BAD06B01)
关键词
农田生态系统
碳循环
碳排放系数
碳效率
曲周县
farmland ecosystem
carbon cycle
carbon emission coefficient
carbon efficiency
Quzhou County
