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浙江天童土地利用方式对土壤有机碳矿化的影响

戴慧;王希华;阎恩荣   

  1. 华东师范大学环境科学系, 上海 200062
  • 收稿日期:2006-11-09 修回日期:1900-01-01 出版日期:2007-07-10 发布日期:2007-07-10

Effects of land use type on soil organic carbon mineralization in Tiantong, Zhejiang Province.

DAI Hui; WANG Xi-hua; YAN En-rong   

  1. Department of Environmental Science, East China Normal University, Shanghai 200062, China
  • Received:2006-11-09 Revised:1900-01-01 Online:2007-07-10 Published:2007-07-10

摘要: 以浙江天童地区的栲树群落为参照,选择了木荷林、灌丛、马尾松林、杉木林、金钱松林、竹林、茶园和裸地等土地利用类型,测定了土壤有机碳含量,以及在25 ℃和60%饱和含水量条件下培养33 d的有机碳矿化速率。结果表明:土壤有机碳含量与矿化速率均以常绿阔叶林最高,针叶林、竹林和茶园次之,裸地最低;相反,土壤有机碳矿化释放的CO2-C比例以栲树林最低。可见,常绿阔叶林土壤的固碳能力高于其它类型,常绿阔叶林被改为其它类型后,土壤有机碳含量和矿化速率显著下降。

关键词: 萼花臂尾轮虫, 品系, 滤水率, 摄食率, 藻类食物

Abstract: Taking Castanopsis fargesii forest as reference, different land use types including Schima superba forest, shrubs, Pinus massoniana forest, plantations of Cunninghamia lanceolat, Pseudolarix kaempferi and Phyllostachys pubescen, Phyllostachys pubescens forest, tea garden, and bare land in Tiantong, Zhejiang Province were selected to investigate their soil organic carbon (SOC) contents, and the SOC mineralization rate after incubated at 25 ℃ and 60% field water capacity over 33 days. The results showed that evergreen broad-leaved forest (Castanopsis fargesii) had the highest SOC content and mineralization rate, followed by coniferous forest, tea garden and bamboo forest, and bare land,while the CO2-C released from the mineralization of SOC was the lowest in C. fargesii forest, suggesting that evergreen broad-leaved forest had the highest carbon-fixing ability, and the SOC content and mineralization rate would have a significant decrease when the land use type shifted from evergreen broad-leaved forest to others.

Key words: Brachionus calyciflorus, Strain, Filtration rate, Ingestion rate, Algae food