[1]WANG Yongping,ZHOU Zike,TENG Haowei,et al.Characteristics of Soil Erosion and Nutrient Losses in Three Land Use Patterns in the Small Watershed of Southern Dianchi[J].Research of Soil and Water Conservation,2021,28(01):11-18.
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Characteristics of Soil Erosion and Nutrient Losses in Three Land Use Patterns in the Small Watershed of Southern Dianchi
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
28
Number of periods:
2021 01
Page number:
11-18
Column:
Public date:
2021-01-10
- Title:
- Characteristics of Soil Erosion and Nutrient Losses in Three Land Use Patterns in the Small Watershed of Southern Dianchi
- Keywords:
- land use; soil erosion; nutrient loss; 137Cs tracing; ecological stoichiometric characteristics
- CLC:
- S157.1
- DOI:
- -
- Abstract:
- In this study, the soil erosion and nutrients(total organic carbon, total nitrogen and total phosphorus)losses in woodland, grassland and cultivated land were investigated based on 137Cs radionuclide tracer technology at Dongdahe catchment of Dianchi watershed. At the same time, soil fertility conditions in the three land use types were revealed through ecological stoichiometric characteristics of soil nutrients(C/N, C/P, N/P). The results showed that:(1)there were differences in soil erosion under different land use patterns; the average erosion rate decreased in the order: farmland [1 538.74 t/(km2·a)]>grassland [1 308.82 t/(km2·a)]>forestland [81.88 t/(km2·a)]; the average erosion degree of the basin was between mild erosion and moderate erosion, but the erosion rates of grassland and farmland were still higher than the local allowable loss rate;(2)different land use patterns hadcertain effects on the distribution of soil nutrient content and soil nutrient losses; a close relation between soil erosion and nutrient loss was observed; the patterns of TOC, TN and TP contents in three land types were different; the soil nutrient loss in forestland was the lowest, most soil nutrient levels were above grade 3, and the soil fertility was better;(3)soil erosion affected soil nutrient stoichiometric characteristics indirectly by affecting nutrient losses, soil C/N decreased in the order: farmland(6.95)>grassland(6.14)>woodland(3.14); soil N/P decreased in the order: forestland(10.99)>grassland(10.07)>farmland(4.82); Soil C/P decreased in the order: grassland(57.47)>woodland(39.94)>cultivated land(27.55); lower C/N, C/P and N/P indicated that the mineralization rate of soil organic matter was fast and the availability of phosphorus was high. Vegetation growth was mainly affected by N element to a certain extent in this catchment.
- References:
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Last Update:
2021-01-15