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[1]LI Guorong,LI Xilai,CHEN Wenting,et al.Influences of Rain Erosion on Soil Nutrient Contents of the Deteriorated Grassland[J].Research of Soil and Water Conservation,2018,25(02):40-45.

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Influences of Rain Erosion on Soil Nutrient Contents of the Deteriorated Grassland

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 25 Number of periods: 2018 02 Page number: 40-45 Column: Public date: 2018-04-03

Title:: Influences of Rain Erosion on Soil Nutrient Contents of the Deteriorated Grassland

Author(s):: LI Guorong^1,2, LI Xilai¹, CHEN Wenting^1,2, LI Jinfang¹, ZHU Haili^1,2, ZHONG Lingzhi¹; 1. Qinghai University, Xining 810016, China;
2. Key Lab of Cenozoic Resources & Environment in North Margin of the Tibetan Plateau, Xining 810016, China

Keywords:: source area of the Yellow River; rain erosion; degraded grassland; soil nutrition; soil and water loss

CLC:: S157.1;S158.3

DOI:: -

Abstract:: In order to study the influences and rule of rain erosion on soil nutrition contents of the deteriorated alpine meadow, the change rule of soil nutrition content with the variation of soil depth, gradient, degeneration degree and rain erosion were tested and analyzed, and the deteriorated grassland in the Yellow River source region was taken as the study object. This paper had the important significance of revealing the deteriorated mechanism of alpine meadow and the ecological environmental protection of three river source region. The results showed that the soil nutrient contents of deteriorated grassland decreased with the increase of soil depth, gradient and degeneration degree, and the decrease magnitude was obvious at the depth of 40 cm; under the same condition, soil nutrition content of severe degradation area in the slope with degree of 10°, decreased 4.2%~49.9% and 14.9%~79.4% than moderate degradation area and mild degradation area, respectively; the total soil nutrient contents of slope with degrees of 20° and 30° were lower than those of the slope with degree of 10°. The more degenerated, the more alkali in surface soil. When the slope degree increased from 10° to 30°, the nutrient indexes decreased 5.6%~18.3% and 12.2%~44.7%, respectively. The soil nutrients of the hill slope lost along with the runoff, the nutrients in run off mainly concentrated within the 30 min after the beginning of raining, the loss extent reached up to 24.6%~66.4%, among them the loss amount of humus was maximum, followed by available nitrogen, soil organic matter, total nitrogen, available potassium and phosphorus, and the variation extents of total phosphorus, available phosphorus and total potassium were relatively smaller. The nutrient loss of deteriorated alpine meadow was more than loess area and artificial planting region under the rain erosion, which reflected that nutrient loss of alpine meadow was one of the reasons for grassland degradation.

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