Murindangabo Yves Theoneste, Kopecký Marek, Hoang Trong Nghia, Bernas Jaroslav, Parajuli Tulsi, Dhakal Suman, Konvalina Petr, Ufitikirezi Jean de Dieu Marcel, Kaneza Gisele, Khanal Babu Ram, Dhakal Shiva Chandra, Shrestha Arjun Kumar
Faculty of Agriculture and Technology, University of South Bohemia in České Budějovice, 37005, České Budějovice, Czech Republic.
University of Agriculture and Forestry, Hue University, 102 Phung Hung, Hue City, Vietnam.
Carbon Balance Manag. 2023 Nov 3;18(1):21. doi: 10.1186/s13021-023-00241-1.
Land use and land cover changes have a significant impact on the dynamics of soil organic matter (SOM) and its fractions, as well as on overall soil health. This study conducted in Bharatpur Catchment, Chitwan District, Nepal, aimed to assess and quantify variations in total soil organic matter (T), labile organic matter fraction (C), stable organic matter fraction (C), stability ratio (SR), and carbon management index (CMI) across seven land use types: pastureland, forestland, fruit orchards, small-scale conventional agricultural land, large-scale conventional agricultural land, large-scale alternative fallow and conventional agricultural land, and organic farming agricultural land. The study also explored the potential use of the Carbon Management Index (CMI) and stability ratio (SR) as indicators of soil degradation or improvement in response to land use changes.
The findings revealed significant differences in mean values of T, C, and C among the different land use types. Forestland and organic farming exhibited significantly higher T (3.24%, 3.12%) compared to fruit orchard lands (2.62%), small scale conventional farming (2.22%), alternative fallow and conventional farming (2.06%), large scale conventional farming (1.84%) and pastureland (1.20%). Organic farming and Forestland also had significantly higher C (1.85%, 1.84%) and C (1.27%, 1.39%) compared to all other land use types. Forest and organic farming lands showed higher CMI values, while pastures and forests exhibited higher SR values compared to the rest of the land use types.
This study highlights the influence of various land use types on soil organic matter pools and demonstrates the potential of CMI and SR as indicators for assessing soil degradation or improvement in response to land use and land cover changes.
土地利用和土地覆盖变化对土壤有机质（SOM）及其组分的动态变化以及土壤整体健康状况具有重大影响。本研究在尼泊尔奇旺区巴拉特普尔集水区开展，旨在评估和量化七种土地利用类型下土壤总有机质（T）、活性有机质组分（C）、稳定性有机质组分（C）、稳定率（SR）和碳管理指数（CMI）的变化，这七种土地利用类型包括：牧场、林地、果园、小规模传统农田、大规模传统农田、大规模替代休耕与传统农田以及有机农耕农田。该研究还探讨了碳管理指数（CMI）和稳定率（SR）作为响应土地利用变化的土壤退化或改善指标的潜在用途。
研究结果显示，不同土地利用类型之间T、C和C的平均值存在显著差异。与果园地（2.62%）、小规模传统农业（2.22%）、替代休耕与传统农业（2.06%）、大规模传统农业（1.84%）和牧场（1.20%）相比，林地和有机农耕的T含量显著更高（分别为3.24%、3.12%）。与所有其他土地利用类型相比，有机农耕和林地的C（分别为1.85%、1.84%）和C（分别为1.27%、1.39%）也显著更高。与其他土地利用类型相比，森林和有机农耕土地的CMI值更高，而牧场和森林的SR值更高。
本研究突出了不同土地利用类型对土壤有机质库的影响，并证明了CMI和SR作为评估响应土地利用和土地覆盖变化的土壤退化或改善指标的潜力。
