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在西江下游的马口水文站对径流进行了 4个季节的有机碳采样分析。研究表明 ,西江径流有机碳的断面构成在各个季节均较为一致 ;季节性变化表现为 ,有机碳和悬浮物含量随流量的增加而增加。随着水体悬浮物含量的增加 ,悬浮物的有机碳含量呈对数趋势降低。西江流域的有机碳侵蚀通量为 10 .18× 10 6gC/km2 ·yr.,是全球外流域有机碳侵蚀通量的 2～ 3倍 ,其中以颗粒有机碳的侵蚀通量为主 ,达到 8.30× 10 6gC/km2 ·yr.,溶解有机碳的侵蚀通量为 1.88× 10 6gC/km2 ·yr .。反映了流域内较强的机械剥蚀过程 ,这与西江流域典型的季风气候、较大的地形高差 ,以及农业耕作历史长久、土地利用强度较大等因素有关。
In the lower reaches of the Xijiang River, the Hydrological Station of Shekou carried out four-season organic carbon sampling analysis of runoff. The results show that the cross-section composition of runoff organic carbon in the Xijiang River is more consistent in all seasons. Seasonal changes show that the contents of organic carbon and suspended solids increase with the increase of the flow rate. With the increase of suspended solids in suspended solids, the organic carbon content of suspended solids decreased logarithmically. The organic carbon eutrophication flux in the Xijiang River Basin is 10.18 × 10 6 gC / km 2 · yr., Which is 2 ~ 3 times of the global organic carbon eutrophic flux in the outer basin, among which the particulate organic carbon eroded the flux, reaching 8.30 × 10 6 gC / km 2 · yr ·, and the erosion flux of dissolved organic carbon is 1.88 × 10 6 gC / km 2 · yr. It reflects the strong mechanical erosion process in the basin, which is related to the typical monsoon climate in the Xijiang River basin, the large topographical height difference, the long history of agricultural farming and the large land use intensity.