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湘中丘陵区毛竹纯林、竹杉混交林土壤有机碳库动态

漆良华1,杜满义1,范少辉1**,岳祥华1,艾文胜2,孟勇2,杨明2   

  1. 1 国际竹藤中心, 北京 100102; 2湖南省林业科学院, 长沙 410004)
  • 出版日期:2012-12-10 发布日期:2012-12-10

Dynamics of soil organic carbon pool in Phyllostachy edulis forest and P. edulis-Cunninghamia lanceolata mixed forest in hilly regions of central Hunan, Southern China.

QI Liang-hua1, DU Man-yi1, FAN Shao-hui1**, YUE Xiang-hua1, AI Wen-sheng2, MENG Yong2, YANG Ming2   

  1. (1International Center for Bamboo and Rattan, Beijing 100102, China; 2Hunan Academy of Forestry, Changsha 410004, Hunan, China)
  • Online:2012-12-10 Published:2012-12-10

摘要:

研究了湘中丘陵区毛竹纯林、竹杉混交林土壤总有机碳及不同形式活性有机碳储量的垂直分布与季节动态。结果表明:竹杉混交林总有机碳及不同形式活性有机碳储量均高于毛竹纯林,SOC、MBC、HWC、WSOC和ROC平均储量分别是毛竹纯林的1.20、1.74、1.35、1.15和1.27倍,0~20 cm土层是土壤有机碳库的主要分布区;不同形式有机碳储量季节动态存在差异,表现为SOC以1月最高,10月最低,MBC 7月最高,1月份最低,ROC 10月最高,4月最低,1月WSOC储量显著高于其他季节;竹杉混交林不同形式活性有机碳储量所占比例均高于毛竹纯林,土壤碳库稳定性较差,土壤ROC储量占总有机碳的比例最大,MBC次之,WSOC较低,HWC最低,分别为18.85%~19.93%、0.34%~0.49%、0.24%~0.25%和0.19%~0.22%;SOC与不同形式活性有机碳均呈正相关,ROC与MBC、HWC,MBC与HWC,HWC与WSOC的正相关关系也达显著水平。
 

Abstract: Pure moso bamboo (Phyllostachy edulis) forest and P. edulis-Cunninghamia lanceolata mixed forest are the main forest types in the hilly regions of central Hunan Province. In this paper, the vertical distribution and seasonal dynamics of soil total organic carbon and soil active organic carbons including microbial biomass carbon (MBC), hot waterextractable carbon (HWC), watersoluble organic carbon (WSOC), and readily oxidizable carbon (ROC) in the two forest types were examined. Compared with pure P. edulis forest, P. edulis-C. lanceolata mixed forest had higher storage of soil total organic carbon and soil active organic carbons. The storage of soil total organic carbon, MBC, HWC, WSOC, and ROC in P. edulis-C. lanceolata mixed forest was 1.20, 1.74, 1.35, 1.15, and 1.27 times higher than those in pure P. edulis forest, respectively, and primarily distributed in the upper soil layer (0-20 cm). There existed a seasonal difference in the storage of different forms of soil organic carbon. For example, the storage of soil total organic carbon was the highest in January and the lowest in October, that of soil MBC was the highest in July and the lowest in January, soil ROC had the highest storage in October and the lowest storage in April, while the storage of soil WSOC was obviously higher in January than in other months. Compared with pure P. edulis forest, P. edulis-C. lanceolata mixed forest had higher ratios of each form of soil active organic carbon to soil total organic carbon, but had poor stability of soil carbon pool. In the storage of soil total organic carbon, soil ROC had the highest proportion, followed by soil MBC, WSOC, and HWC, being 18.85%-19.93%, 0.34%-0.49%, 0.24%-0.25%, and 0.19%-0.22%, respectively. The soil total organic carbon had positive correlations with all the soil active organic carbon forms, and there existed significant positive correlations between soil ROC and MBC, soil ROC and HWC, soil MBC and HWC, and soil HWC and WSOC.