海河流域农田林网碳储量及其潜力评估

The Carbon Storage and Its Potential Estimation of Shelterbelt in Agricultural Area of Haihe River Basin

海河流域是中国农田林网建设的主要地区之一,准确评估海河流域农田林网的碳储量及其潜力对区域碳汇核算有重要意义。笔者基于高分辨率遥感影像、海河流域耕地面积和林网内速生杨生物量的实测数据,构建了适用于农田林网碳储量及潜力评估的方法。结果表明,当前海河流域农田林网碳储量为(0.97～1.55)×106t,年累积量为(0.13～0.21)×106t/年;如果适宜的田间道路全部建成林网,则碳储量可增至(4.71～7.53)×106t,相应的年累积量为(0.63～1.01)×106t/年。海河流域农田林网碳储量巨大,且仍有较大建设潜力,加强农田林网管理和建设水平,对于增加区域生态系统碳汇,开辟农业区固碳增汇的新途径具有重要意义。

Haihe River basin（HRB） is a major farm region with extensive shelterbelt in China.It was important to undertake an assessment of the present and potential carbon sequestration of shelterbelt in agricultural areas of HRB.The author had established a comprehensive method to evaluate the biomass and carbon storage of shelterbelt,including high resolution RS data（about 1 m）,land use/cover data and field survey data of the tree biomass of 5 typical shelterbelt spots.The results showed that the present total carbon storage of shelterbelt in agricultural areas of HRB was（0.97-1.55）×10 6 t,and the annual carbon fixation was（0.13-0.21）×10 6 t/a,respectively.While the shelterbelt had planted over the entire reasonable field path,the potential maximum carbon storage would increase to（4.71-7.53）×10 6 t,and the annual carbon fixation was（0.63-1.01）×10 6 t/a,respectively.There were huge volumes and potential of the carbon storage of shelterbelt in agricultural areas of HRB.It should enhance the regional ecosystem carbon storage and give a new pathway of carbon sequestration in the agricultural region to strengthen the shelterbelt management and construction level.