Characteristics of Dissolved Organic Carbon Loss in Purple Soil Sloping Fields with Different Fertilization Treatments

被引：1

作者：

Xiong Z.-Y. ^{[1
]}

Zheng J.-B. ^{[2
]}

Wang D. ^{[2
]}

Wang F.-H. ^{[1
]}

Wang Y.-Y. ^{[1
]}

Wang Z.-F. ^{[1
]}

Gao M. ^{[1
]}

机构：

[1] College of Resources and Environment, Southwest University, Chongqing

[2] Chongqing Institute of Geology and Mineral Resources, Chongqing

来源：

Huanjing Kexue/Environmental Science | 2021年 / 42卷 / 02期

关键词：

Dissolved organic carbon(DOC); Fertilization treatment; Interflow; Purple soil sloping field; Surface runoff;

D O I：

10.13227/j.hjkx.202007139

中图分类号：

学科分类号：

摘要：

The characteristics of dissolved organic carbon loss with different fertilization treatments were examined to derive the best nutrient management method for sloping farmland in the Three Gorges Reservoir area where maintaining the soil carbon balance and reducing environmental pollution caused by carbon loss is crucial. Experimental runoff plots were set up at the Experimental Station for Soil and Water Conservation and Environmental Research in the Three Gorges Reservoir Region, Chinese Academy of Sciences, involving the following five treatments: No fertilization (CK), conventional fertilization (conventional), optimum fertilization (optimum), biochar combined with 85% optimum fertilizer (biochar), and straw combined with 85% optimum fertilizer (straw). The effects of the five treatments on runoff flux, sediment yield, and soil organic carbon flux were monitored and evaluated. Results show that: ①Subsurface flow accounted for 52.84%-92.23% of the runoff (both surface and subsurface flow) and the loss flux of dissolved organic carbon (DOC) in the subsurface accounted for 43.64%-87.35% of the total loss flux. Thus, in this sloping farmland, subsurface flow was the main pathway of runoff and dominated dissolved organic carbon transport. ②Compared with the optimum treatment, straw treatment reduced the surface runoff flux, sediment yield, surface loss flux of DOC, and loss flux of organic carbon in the sediment by 30.39%, 39.41%, 28.71%, and 23.97%, respectively, but increased the subsurface runoff flux and loss flux of DOC. Compared with the optimum treatment, the biochar treatment significantly increased the surface and subsurface runoff flux, sediment yield, loss flux of DOC in the surface and subsurface, and the loss flux of organic carbon in the sediment. ③The loss flux of DOC accounted for 99.31%-99.94% of the loss flux of soil organic carbon, and DOC was the major species of organic carbon in the organic carbon loss in this type of sloping farmland. The loss flux of DOC under the different fertilization treatments was ranked biochar>optimum>straw>conventional>CK. ④Compared to the optimum treatment, the straw treatment and biochar treatment increased the soil organic carbon (SOC) content by 95.79% and 32.16%, respectively. Based on these results, straw combined with 85% of optimum fertilizer is the best nutrient management method for this sloping farmland as it can reduce surface runoff flux, sediment yield, and the loss flux of soil organic carbon while increasing the soil organic carbon content. © 2021, Science Press. All right reserved.

引用

页码：967 / 976

页数：9

共 38 条

[1] Luo M, Tian D, Gao M, Et al., Soil organic carbon of purple soil as affected by different application of biochar, Environmental Science, 39, 9, pp. 4327-4337, (2018)
[2] Guo T L, Xie J B, Kong C H, Et al., Experimental study on soil organic carbon loss in red soil erosion under different simulated rainfall intensity and slope gradient, Ecology and Environmental Sciences, 24, 8, pp. 1266-1273, (2015)
[3] Huang L, Wang C K, Chao Q C., Interpretation of IPCC special report on climate change and land, Climate Change Research, 16, 1, pp. 1-8, (2020)
[4] Su Z A, Xiong D H, Zhang J H, Et al., Research progress of soil erosion of purple soil slope farmland and its prevention and control measures, Soil and Water Conservation in China, 2, pp. 42-47, (2018)
[5] Yan L, Cao M Y, Hu Z Q, Et al., The effect of fertilization method on nitrogen and phosphorus loss in maize planting zone in Northeast China, Environmental Pollution and Control, 40, 2, pp. 170-175, (2018)
[6] Zhang M, Li D J, Zhou Y., Effects of rainfall intensity and slope gradient on soil erosion, nitrogen and potassium loss on loess slope, Journal of Soil and Water Conservation, 32, 1, pp. 85-90, (2018)
[7] Huang D F, Wang L M, Li W H, Et al., Research progress on the effect and mechanism of fertilization measure on soil fertility, Chinese Journal of Eco-Agriculture, 22, 2, pp. 127-135, (2014)
[8] Gholami L, Sadeghi S H, Homaee M., Straw mulching effect on splash erosion, runoff, and sediment yield from eroded plots, Soil Science Society of America Journal, 77, 1, pp. 268-278, (2013)
[9] Gomez J A, Guzman M G, Giraldez J V, Et al., The influence of cover crops and tillage on water and sediment yield, and on nutrient, and organic matter losses in an olive orchard on a sandy loam soil, Soil and Tillage Research, 106, 1, pp. 137-144, (2009)
[10] Fan Y L, Liu X Z, Gao L, Et al., Effects of fertility-building practices on soil organic carbon loss with sediment in sloping cropland of red soil, Acta Pedologica Sinica, 56, 3, pp. 638-649, (2019)

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