Insights from size fractions to interpret the erosion-driven variations in soil organic carbon on black soil sloping farmland, Northeast China

He, Yanxing; Zhang, Fengbao; Yang, Mingyi; Li, Xuantian; Wang, Zhengang

doi:10.1016/j.agee.2022.108283

Cited by 15 publications

(16 citation statements)

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“…Determining the primary factors controlling runoff and soil erosion is vital to alleviate soil degradation and recover the productivity of degraded croplands (Chen, Zhang, et al, 2023; Xing et al, 2023). The result of RDA indicated that runoff was dominantly influenced by BD, I 30 , TP, SSWC, K s , and P. Erosion was mainly affected by BD, I 30 , TP, SSWC, K s , and I (Figure 8a,b).…”

Section: Discussionmentioning

confidence: 99%

“…Consequently, the rapid decrease in RR and ER with I 30 is easily understood. Moreover, the results of decreases e in RR and ER with land degradation degree are logical (Figure 7), because croplands with higher degrees of land degradation have poorer soil structure and are easier to generate runoff and soil erosion (Chen, Zhang, et al, 2023; Xing et al, 2023). Overall, these results suggest that straw incorporation would fail to control runoff and erosion under extreme rainfall events or on severely degraded land (Rahma et al, 2017; Rajbanshi et al, 2022).…”

Section: Discussionmentioning

confidence: 99%

“…Straw incorporation has a wide application after these shortages are overcome. In fact, a huge amount of straw is produced every year in the black soil region (Chen, Zhang, et al, 2023). How to effectively use those straw, burning, mulching, or incorporating, is a substantial issue related to economic development and environmental protection (Chen, Zhang, et al, 2023; Li et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

“…Totally, 16 runoff plots were established (4 degradation degrees × 2 treatments × 2 replicates). The regional commonly used approach of straw incorporation was strictly followed in this study (Chen, Zhang, et al, 2023; Xing et al, 2023). The previously collected residue of corn (collected in October 2021) was crushed into fragments with a length of 2–3 cm before it was incorporated.…”

Section: Methodsmentioning

confidence: 99%

“…The previously collected residue of corn (collected in October 2021) was crushed into fragments with a length of 2–3 cm before it was incorporated. The crushed fragments were evenly mixed into the top soil layer (0–20 cm) by rotary tillage in mid‐May (Chen, Zhang, et al, 2023). The total nitrogen, phosphorus, and potassium content of the incorporated straw was 7.70, 1.36, and 6.34 g kg −1 , respectively.…”

Section: Methodsmentioning

confidence: 99%

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Effect of straw incorporation on controlling runoff and soil erosion in cropland with different land degradation degrees

Wang,

Zhang,

Chen

et al. 2023

Land Degrad Dev

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Straw incorporation plays a vital role in regulating runoff and soil erosion of cropland. However, the benefits of straw incorporation to control runoff and soil erosion on croplands under different degradation degrees have not been fully clarified. This study was performed to investigate the benefits of straw incorporation to reduce runoff and soil erosion under different degradation degrees and determine its dominant influencing factors. The event runoff and soil erosion were measured from late May to late September 2022 using 16 runoff plots (9 m in length and 3.3 m in width) in the black soil region of Northeast China. The results showed that straw incorporation significantly reduced runoff and soil erosion on croplands with different degradation intensities. Compared to croplands without straw incorporation, runoff and soil erosion of straw incorporation decreased by 48. 8%, 40.0%, 30.9%, 25.5%, and 55.2%, 48.8%, 40.8%, and 36.5% for croplands of no, light, moderate, and strong degradation intensities, respectively. The roles of straw incorporation in controlling runoff and erosion decreased with rainfall intensity. Compared to light rainfall, runoff reduction ratio and erosion reduction ratio of moderate and heavy rainfalls reduced by 19.5%–61.3% and 27.5%–64.4%. The benefit of straw incorporation to control runoff and erosion was limited on strong degraded cropland or under heavy storm. Moreover, soil hydrological properties and crop growth characteristics decreased by land degradation and improved by straw incorporation, which inevitably affected runoff and soil erosion. Soil bulk density, maximum rainfall intensity of 30‐min, saturated water content, precipitation, rainfall intensity, saturated hydraulic conductivity, and total porosity were the dominant factors affecting the roles of straw incorporation in controlling runoff and erosion on degraded croplands. The results of this study are helpful to prevent land degradation or recover the functions of degraded lands in semi‐humid region.

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Section: Discussionmentioning

confidence: 99%