摘要
Abstract
With the actual crops production,as well as the forestry carbon sink calculation method ,we estimate the carbon sinks and their e-cological value of agriculture and forestry of Jiaxing plain, which located in northern Zhejiang Province. And the impact of the past more than 50 years of local land use change on carbon uptake by main crops and forestry was also analyzed. The estimated results showed that a total of 5.449 million tons of CO2 was absorbed annually, as well as 3.963 million tons O2 was released by the main crops and forestry in Jiaxing area. The CO2 absorbed by the major crops was much more than the forestry (including fruit, mulberry), and rice absorbed more than 50%CO2 in that of total by main crops and forestry. Forestry unit area to absorb CO2 23.47 t·hm-2·a-1,was greater than the crops 15.28 t·hm-2·a-1 . Carbon sequestration of rice per unit area was also the largest in the major crops in this area, reached 21.32 t·hm-2·a-1, and the paddy field per unit area of soil organic carbon storage capacity of 50.41 t·hm-2·a-1 was significantly higher than the dryland soil by 36.27 t·hm-2·a-1. In the past over 50 years ,Jiaxing plain land utilization was violent changed, especially in the past 30 years.The cultivated area reduced more than 20%, crop planting area reduced by 1/3, rice area reduced by 60%and the urban construction area significantly increased, which the year of 2011 increased 3.3 times than that of 1985. Although crop yields continued growing, the reduced amount of crop area carbon uptake was dominant, leading to the agriculture and forestry sorption of CO2 21%reduction in 2011 than in 1985.关键词
土地利用/农业碳汇/林业碳汇/土壤碳汇/稻田生态系统/嘉兴平原Key words
land use/agricultural carbon sequestration/forestry carbon sequestration/soil carbon sequestration/paddy field ecosystem/Jiaxing plain分类
环境科学
