生草免耕桃园生态系统的碳交换动态变化特征  

Dynamic change characteristics of carbon exchange on sown grass and no-tillage peach orchard

作　　者：郭家选[1] 何桂梅 师光禄[1] 王小平 王有年[1] 

机构地区：[1]北京农学院植物科学技术学院,农业应用新技术北京市重点实验室,北京102206 [2]北京市林业碳汇工作办公室,北京100013

出　　处：《农业工程学报》2012年第12期216-222,共7页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家科技支撑项目(2008BAD95B07;2011BAD32B03);国家自然科学基金项目(31040006);国家水体污染控制与治理科技重大专项(2008ZX07425-001);北京市教育委员会科研水平提高经费资助(5076016010)

摘　　要：植物固碳是减缓全球气候变暖的有效途径。然而,农田尺度果园固碳能力目前还不清楚。该文采用涡度相关技术,研究粗砂土立地条件下12a生树龄生草免耕桃园生态系统碳交换和能量平衡各分量的动态变化。结果表明,在盛花期存在明显的固碳能力,日峰值为-0.33mg/(m2·s)(以CO2计)。在旺盛生长期波文比值在0.3以下,日净固碳值最高为-25.1g/(m2·d)(以CO2计)。落叶期存在明显的高CO2排放,日峰值为0.60mg/(m2·s)(以CO2计)。监测期内桃园生态系统日平均波文比值和净固碳量分别为(1.22±1.56)和(-2.90±6.63)g/(m2·d)(以CO2计),年净生态系统碳交换量(net ecosystem exchange,NEE)为-1052g/(m2·a)(以CO2计)。以上结果揭示粗砂土12a生树龄生草免耕桃园生态系统有较强的固碳能力。该文为评价果园碳汇功能提供基础数据。Plant carbon sequestration is an effective way to abate the global warming. However, the field-scale carbon exchange on a peach orchard remains yet unclear. Here, using an eddy covariance technique, the carbon exchange and energy balance were analyzed on a coarse-sand-field, no-tillage, 12-year-old-peach orchard. The results showed that during full flowering, the ability to sequestrate carbon was remarkable, it reached on the peak of -0.33 mg （CO2）/（m2·s）. During rapid growth, the Bowen ratio was under 0.3 and daily net carbon sequestration reached on the peak of -25.1 g （CO2）/（m2·d）. During the leaf fall stage, there was a great deal of CO2 emissions, the peak value of carbon sequestration reached 0.60 mg （CO2）/（m2·s）. During monitoring period, the daily average of net carbon sequestration and Bowen ratio was （1.22±1.56） and （-2.90±6.63）g（CO2）/（m2·d）, respectively. The net carbon sequestration could reach-1052 g（CO2）/（m2·a） in a year. These results revealed that there were high carbon sequestration on a coarse-sand-field, no-tillage peach orchard. This research provides basic data for evaluating carbon sink function of orchard.

关 键 词：CO2 通量 生态系统 桃园 波文比值 涡度相关法 

分 类 号：S718.554.2[农业科学—林学]