JOURNAL OF NATURAL RESOURCES ›› 2016, Vol. 31 ›› Issue (8): 1399-1409.doi: 10.11849/zrzyxb.20150917

• Resource Economy • Previous Articles     Next Articles

Changes of Organic Carbon and Readily Oxidizable Carbon in Deep Soil at Different Developmental Stages of Artificial Pinus tabulaeformis Plantation and the Impact Factors

QIU Tian-tian1, LIU Guo-bin1, 2, WANG Guo-liang1, 2, SUN Li-peng1, YAO Xu1   

  1. 1. Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China;
    2. Institute of Soil and Water Conservation, CAS and Ministry of Water Resource, Yangling 712100, China
  • Received:2015-08-25 Revised:2016-01-11 Online:2016-08-20 Published:2016-08-20
  • Supported by:
    National Natural Science Foundation of China, No.41371508; Natural Science Basic Research Key Project of Shaanxi Province, China, No.2013JZ006; Special Funds of the Basic Scientific Research Project of NWSUAF, China, No.ZD2013021

Abstract: It is not clear how plantation affect the soil organic carbon (SOC) in deep soil for terrestrial ecosystem. Based on space for time method, we studied the effect of Pinus tabulaeformis plantations at three developmental stages (young forest, middle age forest and mature forest) on the soil organic carbon (SOC) and soil readily oxidizable carbon (ROC) in 0-200 cm soil profile. The results showed that SOC content and storage significantly increased in soils with different developmental stages of Pinus tabulaeformis plantation compared with abandoned cropland in 0-200 cm profile. In the 0-100 cm soil layer, average SOC content of mature forest, middle age forest and young forest were 2.03, 1.85 and 1.59 times more than that in abandoned cropland, respectively. SOC storage in shallow and deep soil layers contributed 61.0%-69.8% and 30.2%-39.0% to total SOC storage in the whole profile (0-200 cm) at all of the investigated developmental stages. SOC storage in shallow soil layer varied significantly among different developmental stages, however, no obvious difference of SOC storage in deep soil layer was observed at all developmental stages. Compared to that in abandoned cropland, the ROC storage in soils of young forest, middle age forest and mature forest increased 54.8%, 82.0% and 91.6% in shallow soil layer and 32.4%, 40.9% and 58.1% in deep soil layer, respectively. ROC storage in deep soil layer contributed 31.2%-33.3% to total ROC storage in the whole profile (0-200 cm) at all developmental stages. SOC and ROC content in shallow soil layer were influenced by a number of factors, furthermore, ROC content in deep soil showed significant correlations with the plant height, root biomass, litter thickness and litter biomass. In conclusion, construction of artificial forest may significantly improve the soil carbon pool in both shallow and deep soil profiles.

Key words: deep soil layer, developmental stage, Loess Plateau, Pinus tabulaeformis plantation, soil readily oxidizable carbon

CLC Number: 

  • S714