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[1]LIU Yanqing,WANG Jilei,LI Zizhong.Research Process on the Effects of Straw Mulch on Soil Moisture and Soil Erosion[J].Research of Soil and Water Conservation,2021,28(06):429-436.

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Research Process on the Effects of Straw Mulch on Soil Moisture and Soil Erosion

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 28 Number of periods: 2021 06 Page number: 429-436 Column: Public date: 2021-10-10

Title:: Research Process on the Effects of Straw Mulch on Soil Moisture and Soil Erosion

Author(s):: LIU Yanqing，WANG Jilei，LI Zizhong; (College of Land Science and Technology，China Agricultural University，Beijing 100193，China)

Keywords:: straw mulch; soil erosion; soil water infiltration; soil water evaporation

CLC:: S157.1; S27

DOI:: -

Abstract:: With the development of China's economy，agricultural productivity in China has also been greatly improved. However，water shortage and cultivated land degradation are still the main limiting factor for agricultural production in both arid and semi-arid regions. Sloping land with frequent soil erosion is seriously threatened by soil erosion. Straw mulch，to some extent，can inhibit soil water evaporation，increase surface roughness，promote water infiltration，and thus improve soil water content; meanwhile，straw mulch can prevent direct interaction between external forces and surface soil particles，reduce the occurrence of soil erosion，and improve soil organic matter content and thus improve soil productivity. In order to make more effective use of water resources，prevent and control soil erosion，protect ecological security，and promote ecological civilization construction，Chinese scholars have carried out a series of studies involving the influence and mechanism of different straw mulch methods，straw mulch degree and straw mulch amount on farmland water use efficiency and soil erosion，and have achieved considerable results. When the application of straw mulch is about 3～10 t/hm²，the soil ineffective evaporation could be reduced by about 20%～90%. After that，the effect of increasing the straw mulch on evaporation inhibition was not significant. Although straw mulch may prevent rainfall infiltration under certain conditions，it can also inhibit underwater evaporation and salt rehydration，and finally improve soil water content and water use efficiency. Straw strip mulch，which prevents soil erosion，reduces the negative influence of it on seeding and germinating. A lot of researches suggest that 30%～60% of straw coverage and high stubble can significantly reduce water loss and soil erosion by 60%～90%. Some studies also suggest that under the circumatance of high rainfall intensity(≥100 mm/h)，straw mulching on farmland with steep slope or plough layer will increase soil erosion. This paper summarizes the results of predecessors' study on soil water and soil erosion，and concludes that the current straw mulching measures are comprehensive and in-depth research，but there still have some areas to be further studied: quantitative research on the effect and mechanism of straw mulch on soil water movement and soil erosion; definitional revision of straw mulch technical regulations; development of straw mulch and seeding machinery; regional applicability and evaluation of straw mulch measures; determination and calibration of straw mulch parameters in crop growth model and soil erosion model.

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