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天津平原杨树人工林生态系统碳储量

李平1,2,肖玉1**,杨洋3,张昌顺1   

  1. 1中国科学院地理科学与资源研究所, 北京 100101; 2中国科学院大学, 北京 100049; 3北京市林业勘察设计院, 北京 100029)
  • 出版日期:2014-03-10 发布日期:2014-03-10

Ecosystem carbon storage in poplar plantations of different stand ages in Tianjin plain.

LI Ping1,2, XIAO Yu1**, YANG Yang3, ZHANG Chang-shun1   

  1. (1Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; 2University of Chinese Academy of Sciences, Beijing 100049, China; 3Beijing Forestry Survey and Design Institute, Beijing 100029, China)
  • Online:2014-03-10 Published:2014-03-10

摘要:

森林生态系统是最重要的陆地生态系统碳库,人工林生态系统碳储量在森林碳储量中所占比重越来越大。本研究选取天津平原地区不同林龄杨树人工林,通过野外调查和室内分析,估算了杨树人工林乔木、草本、凋落物和土壤碳储量。结果表明:人工杨树幼龄林、中龄林和成熟林的乔木生物量分别为43.65、56.18和121.59 t·hm-2,乔木各组分生物量所占比例在幼龄林和中龄林中表现为干>根>枝>叶,在成熟林中表现为干>枝>根>叶。3个林龄段杨树人工林的草本层生物量分别为4.60、2.92和1.58 t·hm-2,凋落物生物量分别为0.46、0.35和0.66 t·hm-2。人工杨树幼龄林、中龄林和成熟林生态系统碳储量分别为84.34、121.03和121.72 t C·hm-2,其中群落碳储量分别占25.85%、22.25%和46.58%,土壤碳储量分别占74.15%、77.75%和53.42%。群落碳储量中乔木碳储量分别为20.04、25.78和55.95 t C·hm-2;草本碳储量分别为1.63、1.05和0.57 t C·hm-2;凋落物碳储量分别为0.14、0.10和0.19 t C·hm-2。3个林龄段杨树人工林土壤有机碳储量(0~100 cm)依次为62.53、94.10和65.03 t C·hm-2,其中0~30 cm土壤有机碳储量所占比例分别为33.91%、37.64%和44.16%,随林龄的增加而增加。结果表明,杨树人工林生态系统碳储量随林龄的增加显著增加,而目前天津杨树人工林以幼龄林为主,未来天津杨树人工林存在巨大的碳储存空间。
 

关键词: 品质, 大棚, 黄瓜, 产量, 氮肥

Abstract: Forest is the most important carbon pool of terrestrial ecosystems, of which the forest plantations become more and more crucial. We investigated the differentaged poplar plantations in Tianjin through field surveys and laboratory measurements, estimated the carbon stock in the tree layer, herb layer, litter layer and soils (0-100 cm). The results showed that the biomasses of the tree layer in the young, medium and matured poplar plantations were 43.65, 56.18 and 121.59 t·hm-2, respectively. The proportions of different organs to the tree biomass were in the order of stem>root>branch>leaf  in the young and medium age stands, and of stem>branch>root>leaf in the matured poplar plantations. The biomasses of the herb layer of the three age plantations were 4.60, 2.92 and 1.58 t·hm-2, respectively, and that of the litter layer were 0.46, 0.35 and 0.66 t·hm-2, respectively. The total ecosystem carbon storage values of the young, medium and matured poplar plantations were estimated to be 84.34, 121.03 and 121.72 t C·hm-2, respectively. Among the carbon storage of the three age groups, plant communities accounted for 25.85%, 22.25% and 46.58%, respectively, and soils accounted for 74.15%, 77.75% and 53.42%, respectively. The carbon storage values of the tree layer in the young, medium and matured poplar plantations were 20.04, 25.78 and 55.95 t C·hm-2, respectively. The carbon storage values of the herb layer in the three age groups were 1.63, 1.05 and 0.57 t C·hm-2, respectively, and that of the litter layer were 0.14, 0.10 and 0.19 t C·hm-2, respectively. The soil organic carbon storage values (0-100 cm) in the three age groups were 6253, 94.10 and 65.03 t C·hm-2, respectively. The proportions of the carbon storage in the 0-30 cm soil layer to that of the total soil layer were 33.91%, 37.64% and 44.16%, increasing with the stand age.  It was showed that the ecosystem carbon storage of the poplar plantations in Tianjin increased with the increasing stand age. Nowadays, the young poplar plantations account for a large proportion of the total forest plantations in Tianjin. Thus, the poplar plantations in Tianjin would have a huge carbon sequestration potential in the future.

Key words: nitrogen fertilizer, quality., greenhouse, cucumber, yield