论文部分内容阅读
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。
Farmland ecosystems play a prominent role in the global carbon cycle. Studying the carbon cycle of farmland ecosystems and grasping the carbon budget of the region are of great significance to digging up the multi-functionality of farmland and developing low-carbon agriculture, and provide the basis for formulating agro-ecological compensation . This paper comprehensively analyzes the carbon cycle of farmland ecosystem and revises the carbon emission coefficient according to the actual situation. The carbon source, carbon sink and carbon efficiency of farmland ecosystem in Quzhou County are studied from the three processes of carbon input, carbon output and carbon sequestration . The results showed that the carbon balance of farmland ecosystem in Quzhou County in 2011 was -3.3 million tons, and the fixed carbon in that year was 166,100 tons. Soil respiration, agricultural machinery and nitrogen, phosphorus use is the main factor causing carbon emissions. The carbon sources and carbon sequestration of farmland ecosystems in different towns and villages are different. Due to the high input and low output, towns and villages in Quzhou Town lead to the system as carbon source in that year, and towns such as Houcun Town and Heping Town in Henan Province, due to low input and high output, Year system for carbon sinks. Although the overall farmland ecosystem in Quzhou County is a carbon source, it still has strong carbon sequestration capacity and high carbon efficiency, to a certain extent, it can make up for the environmental impact of carbon emissions.