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Comparison of Carbon Storage and Distribution in Different Poplar-Crop Intercropping Patterns

不同杨-农间作模式碳储量及分布的比较*


采用生物量法对杨农复合生态系统中3种不同间作模式各组分的碳含量、碳储量及整个系统碳储量进行比较研究。结果表明: 在K,P及W 3种模式中,深度为1 m的土壤碳含量变化范围0.64~15.27 g·kg-1,土壤碳储量分别达71.19,40.67和42.64 t·hm-2; 杨树不同器官中碳含量仅细根和毛细根与其他器官存在显著差异,但碳储量树干所占比例最高,3种模式中分别占到49.7%,50.8%,51.2%; 4种间种作物中小麦、玉米、大豆、水稻根的碳含量均明显低于其他器官,碳储量都为收获部分(穗或豆荚)所占比例最大,小麦、玉米、大豆均达50%左右,水稻为45%左右,但3种模式农作物均以小麦+玉米的年耕作制度的碳储量最大; 3种模式中,凋落物归还碳量分别为(0.78±0.23),(0.73±0.22)和(0.37±0.09)t·hm-2a-1; 杨农复合生态系统碳储量均是土壤>农作物>杨树>凋落物,但整个系统的碳储量为K模式>W模式>P模式。

Carbon storages and distribution in three patterns of poplar-crop intercropping patterns were studied with a biomass measurement method in the North of Jiangsu Province. The results indicated that total soil carbon in 100 cm ranged from 0.64 to 15.27 g·kg-1. For the three patterns, soil carbon storage of K, P and W patterns was 71.19, 40.67 and 42.64 t·hm-2 respectively. There was a significant difference in carbon density between fine roots and other components of the poplar, but carbon storage in poplar stem ranked first compared with other poplar components. Carbon density in roots of corps was significantly lower than that of other components of the crops investigated, and the carbon storage in the harvested parts (ears or pods) was higher than that of the other parts, accounting for about around 50% for wheat, maize and bean, while around 45% for rice. However, the highest carbon storage of the crops was observed in the annual cropping system of wheat+corn among three poplar intercropping patterns. The annual carbon return in litterfall was (0.78±0.23),(0.73±0.22) and (0.37±0.09)t·hm-2a-1 respectively for K, W and P pattern. Carbon storage in poplar-crop intercropping ecosystem for the three patterns was in an order of K pattern>W pattern> P pattern, while the carbon storage in the various parts of the agroforestry system was soil>crop>poplar>litterfall for all the three poplar-crop intercropping patterns.

 


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