中国生态农业学报2018，Vol.26Issue(7)：937-947,11.DOI:10.13930/j.cnki.cjea.171124
黄土台塬不同土地利用方式土壤CH4通量特征及主控因子分析
CH4 flux characteristics and influencing factors in six land use patterns in the Loess Plateau
摘要
Abstract
Change in land use can influence soil micro-environment along with microbial, physiological and biochemical processes, significantly affecting the generation and emission of greenhouse gases. At present, researches on greenhouse gas flux from land use transformation have mainly focused on carbon dioxide (CO2), largely neglecting methane (CH4) generation and emission. This study determined the characteristics of soil CH4 fluxes and the influencing factors, also highlighting the critical factors of different land use patterns (cultivated land, natural grassland, shrub land, arbor and shrub land, arbor land and orchard). The study laid the basis for predicting the contribution of land-use-driven transformation to greenhouse effects in the Loess Plateau region. The study was conducted in Malian Forest Farm of Yongshou County, Shaanxi Province. In the study, soil CH4 fluxes in different land use types were measured during the period from April 2015 to March 2016 using static chamber chromatograph techniques. The related environmental factors were recorded, including soil temperature, soil moisture, surface temperature and soil total nitrogen content. The results indicated that soils were CH4 sink under different land use types. There were significant differences (P ＜ 0.05) in CH4 uptake fluxes in different land use types. Soil CH4 fluxes in six land use types had similar seasonal variations, higher in summer and autumn than in winter and spring. Average soil CH4 uptake was in the order of arbor and shrub land (51.24 μg·m-2·h-1) ＞ arbor land (44.80 μg·m-2·h-1) ＞ shrub land (31.52 μg·m-2·h-1) ＞ natural grassland (25.89 μg·m-2·h-1) ＞ orchard (18.97 μg·m-2·h-1) ＞ cultivated land (14.89 μg·m-2·h-1). Soil CH4 uptake fluxes in different land use types were positively correlated with soil temperature, surface temperature and total nitrogen, and negatively correlated with soil moisture. Soil temperature at the 0-20 cm soil layer was the main layer of production of soil CH4 fluxes in six land use types. The uptake CH4 under natural soil conditions was significantly higher than that in agricultural soils. The transformation of cultivated land to forest land increased CH4 uptake, enhancing the mitigation of greenhouse effect of soil.关键词
黄土台塬/土地利用方式/土壤CH4通量/CH4汇/耕地/林地Key words
Loess Plateau/Land use type/Soil CH4 flux/CH4 sink/Cultivated land/Forest land分类
农业科技引用本文复制引用
刘欢,刘梦云,刘丽雯,赵国庆,张杰,张萌萌,李笑然..黄土台塬不同土地利用方式土壤CH4通量特征及主控因子分析[J].中国生态农业学报,2018,26(7):937-947,11.基金项目
中国科学院重点部署项目(KFZD-SW-306)和农业部农业环境重点实验室开放基金项目资助 This study was supported by the Key Project of Chinese Academy of Sciences (KFZD-SW-306) and the Open Fund of Ministry of Agriculture Key Laboratory of Agricultural Environment. （KFZD-SW-306）
