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Does Land Use Age Influence Carbon Cycling in the Tibetan Plateau?
Author(s) -
Justine Meta Francis,
Pan Kaiwen,
Jean de Dieu Nambajimana,
Karamage Fidele,
Tadesse Zebene,
Pandey Bikram,
Yang Wanqin,
Wu Fuzhong,
Olatunji Olusanya Abio`udun,
Nepal Nirdesh,
Uchenna Ochege Friday,
Tariq Akash,
Zhang Lin,
Sun Xiaoming
Publication year - 2020
Publication title -
journal of geophysical research: biogeosciences
Language(s) - English
Resource type - Journals
eISSN - 2169-8961
pISSN - 2169-8953
DOI - 10.1029/2019jg005295
Subject(s) - shrub , environmental science , grassland , shrubland , soil carbon , land use, land use change and forestry , agroforestry , land use , carbon sequestration , deforestation (computer science) , carbon stock , forestry , ecosystem , geography , ecology , agronomy , climate change , soil science , soil water , biology , carbon dioxide , computer science , programming language
Although substantial information had been generated on the effects of land use change on soil organic carbon (SOC) and total nitrogen (TN) storage, studies are absent on multifactorial effects of land use types, land use age, and elevation on SOC and TN storage. SOC and TN were therefore investigated in 30 field sites comprising natural forests, planted forests, shrub, and grasslands. SOC and TN stocks differed and correlated significantly with land use age; the C stocks correlates significantly with land use change compared the TN stocks. However, there was no relation between the C and N stocks with elevation, implying that SOC and TN are solely dependent on land use age. SOC sequestration potentials of the sampled ecosystems were 345.86, 293.19, 266.45, and 251.23 t ha −1 for the natural forests, planted forests, shrub, and grasslands with total mean value of 289.18 t·ha −1 (1,060.42 t·ha −1 CO 2− eq). A significant SOC stock loss (17.96%, 29.80%, and 37.66%) occurred in converting natural forests to planted forests, shrub, and grasslands, whereas gains (27.36%, 14.31%, and 5.71%) would occur in reconverting grassland to natural forests, planted forests, and shrublands. Therefore, the C that was lost during deforestation and conversion of natural forests into other land use types could not match the carbon gains thereafter. Our results suggest that land use change and land use age have influenced soil C and N stocks. Moreover, natural forests are better in ecological conservation and restoration of degraded lands. This study provides baseline information for C and N management in ecologically restored and degraded lands.