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Université de Mongolie-Intérieure (2019)

Loss of Soil Nutrients in Inner Mongolia under Wind Erosion Numerical Simulation and Its Ecological Impact

吴冰;

Titre : Loss of Soil Nutrients in Inner Mongolia under Wind Erosion Numerical Simulation and Its Ecological Impact

Auteur : 吴冰;

Grade : Master’s Theses 2019

Université : Université de Mongolie-Intérieure

Résumé
Soil erosion by wind is a worldwide phenomenon.It not only pollutes air quality and reduces visibility,but also damages crops,human health and leads to desertification by burying roads and fences through the wind.Wind erosion causes soil degradation and nutrient loss by removing nutrient-rich surface soil.Land degradation caused by soil erosion accounts for 28%of the world’s degraded land.This study in Inner Mongolia in northern China as the research area,the transport process of soil wind-eroded dust in 2017 was simulated by using WRF-Chem model.The results of simulation were used to quantitatively analyze the loss of soil nutrient available nitrogen(AN),available phosphorus(AP),available potassium(AK),total nitrogen(TN),total phosphorus(TP),total potassium(TK)the loss of status.Furthermore,the change of soil fertility in Inner Mongolia under wind forced was evaluated.The main conclusions are as follows:The loss of TN in the soil surface layer in the study area was about 0.02541-3.489 g/m 2,and the loss of AN was 0.9702-77.92 mg/m 2.The loss of TP was about 0.017-0.309 g/m 2,and the loss of AP was0.12555-6.25 mg/m 2.The total k loss was about 1.3746-4.4265 g/m 2,and the loss of AK was 2.6748-64.284 mg/m 2.Under the action of wind force,soil nutrient loss is concentrated on some areas where sparse vegetation,low soil moisture content and uneven distribution of soil particles.According to the value ranking analysis of 20 sample points in Inner Mongolia,a1 in tongliao ranked the first and a20 in alxa league ranked the lowest.The sample point with the largest soil nutrient loss rate under wind force was a1 in tongliao city,with a loss rate of 17.4%.The a3sample located in xingunita was the next best.The lowest sample loss rate is a17 located in ordos.Loss rate from large to small row a1>a3>a14>a6>a7>a15>a16>a11>a12>a10>a4>a19>a8>a20>a5 a9>a2>a13>a18>a17.According to the results of sample loss rate arrangement,most areas with high soil surface nutrient loss rate are located in eastern and central Inner MongoliaThe study estimated the soil surfaces nutrient loss in northwest China under the influence of wind forces,so as to evaluate the soil fertility in Inner Mongolia.The results provide a scientific basis of regional agricultural development and ecological environment restoration,help to assess the impact on wind erosion of the degradation of land resources in the region,and will also play a role in soil conservation

Mots clés : wind erosion; Inner Mongolia; WRF-Chem; soil nutrient lose;

Présentation (CNKI)

Page publiée le 20 mai 2020