不同利用方式下土壤矿物结合态有机碳特征与容量分析

doi:10.3864/j.issn.0578-1752.2014.21.014

Abstract

Abstract: 【Objective】 Mineral-associated organic carbon (MOC, ＜53 µm) is one of the most important stabilization mechanisms of soil organic carbon (SOC). The objectives were to explore the content, proportion, and variations of the mineral-associated organic carbon from China's major land uses of cropland, grass land, and forest, which have a great significance to SOC stabilization, soil carbon sequestration potential, and sustainable carbon management.【Method】Publications were searched by using Web of China Knowledge Resource Integrated Database, Wan Fang Database, Science Direct and Springer link with the three keywords “2000-2014”, “Soil organic carbon”, “China” and “Aggregate fractionation (＜53 µm)”. A data set was set up with 901 pairs of data from 111 published papers that reported soil organic carbon and fractionation. Four categories of land uses such as Cropland (n = 580), Grassland (n = 98), Forest (n = 193), and other (Orchards, Tea plantations, etc., n = 31) were included. Soils from cropland included six soil classifications: Black soil, Paddy soil, Brown soil, Fluvo-aquic soil, Red soil, and Gray desert soil. The variations analysis of the SOC content and MOC and the proportion in different land uses and soil classification were performed using Kruskal-Wallis H significance test. 【Result】 The median value of total SOC content and MOC were significantly different among the three land uses. The total SOC content in forest soil was 18.2 g·kg^-1, which was significantly higher than those in the soils from grassland and cropland (12.0 and 10.3 g·kg^-1, respectively). The content of MOC (12.0 g·kg^-1 soil) was also significantly higher than that from cropland and grass land (8.0 and 7.6 g·kg^-1 soil, respectively). There were significant positive correlations (P＜0.001) between total SOC and MOC in the three land uses. The proportion of MOC in cropland (74.8%) was significantly higher than those in grassland (67.8%) and forest (70.3%) soil. It was also found that the proportion of MOC varied significantly according to land use and soil classification. The MOC proportion of black soil was the highest and the median was 87.4%, followed by paddy soils (76.7%) and red soil (74.0%). However, the proportion of gray desert soil was the lowest (62.5%). Regression analysis showed that the proportion of MOC decreased significantly with the increase in total SOC (P＜0.05) in black soil, paddy and brown soils, which was relatively high in SOC content. The MOC content was significantly correlated with the fine soil particles (＜53 µm) in cropland, grassland and forest, indicating the MOC saturation degrees were 68.4%, 58.7% and 91.5%, according to Six (2002) estimation, respectively. 【Conclusion】 MOC is unsaturated and can be further enhanced both in cropland and grassland soils. Therefore, the fine soil particles (＜53 µm) from cropland and grassland still have a high carbon sequestration potential.

Key words: land use, soil classification, mineral-associated organic carbon, cropland

CAI An-dong, XU Xiang-ru, ZHANG Xu-bo, XU Ming-gang, ZHANG Wen-ju. Capacity and Characteristics of Mineral Associated Soil Organic Carbon Under Various Land Uses[J].Scientia Agricultura Sinica, 2014, 47(21): 4291-4299.

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