豫东平原农区杨树-农作物复合生态系统的碳贮量

将豫东平原农区5a、9a、11a和13a4个林龄阶段的杨树-农作物复合系统分为林木、农作物、凋落物和土壤4个子系统,分别研究其碳贮量.结果表明:5a、9a、11a和13a杨树-农作物复合生态系统林木及凋落物的碳贮量分别为7.86、42.07、44.31和60.71t·hm-2;间作作物平均每年可吸收CO26.8t·hm-2;农田土壤碳贮量分别为45.55、51.06、55.94和60.49t·hm-2;杨树-农作物间作系统的总碳贮量分别达60.81、100.09、106.76和127.34t·hm-2,远高于单作农田(49.36t·hm-2).各年龄阶段杨树和土壤碳贮量占总碳贮量的比例最大,在87.1%～93.1%,而农作物和凋落物碳贮量比例较小,占总贮量的6.9%～12.9%.说明农林复合生态系统具有很强的吸收和固定碳的能力.

Carbon storage of poplar-crop ecosystem in Eastern Henan Plain

Aimed to understand the carbon storage of poplar-crop ecosystem in Eastern Henan Plain,the poplar-crop ecosystems with different ages(5,9,11,and 13 years old)of poplar were selected,and each of them was further divided into four subsystems,I.e.,forest,crop,litterfall,and soil.In the poplar-crop ecosystems with 5,9,11,and 13 years old poplar,the carbon storage of the subsystems forest and litterfall was summed as 7.86,42.07,44.31,and 60.71 t·hm~(-2),respectively.Subsystem crop averagely sequestrated 6.8 t·hm~(-2) of CO_2 per year,and the carbon storage of subsystem soil achieved 45.55,51.06,55.94,and 60.49 t·hm~(-2),respectively.The total carbon storage of these four poplar-crop ecosystems reached 60.81,100.09,106.76,and 127.34t·hm~(-2),respectively,much higher than that in mono-cultured farmland(49.36 t·hm~(-2)).For the test poplar-crop ecosystems,the carbon storage of subsystems forest and soil occupied a large proportion,accounting for 87.1%-93.1% of the total carbon storage,while that of subsystems crop and litterfall occupied a relatively small proportion,being 6.9%-12.9% of the total,illustrating that agroforestry ecosystem had a high potential in carbon absorption and sequestration.