Response of soil nutrients to typical plant and engineering measures for
soil and water conservation in northern rocky mountain area of China
Abstract
Nine slope runoff plots with different soil and water conservation
measures were selected in Baima small watershed of Pingshun County,
Shanxi Province of China, to explore more effective soil and water
conservation measures to avoid soil nutrient losses, improve soil
fertility, and control non-point source pollution. Soil organic carbon
(SOC), total nitrogen (TN) and available potassium (AK) were determined
and compared in this paper. The results show that,1) In grass measures,
sowing of both riochloa is chaemum are more suitable for nutrient
protection on the upper slope, fertility and the whole nutrient content
of natural grass is optimum (SOC:24.86g/kg, TN:2.09g/kg,
AK:157.00mg/kg);2) Plant combined with engineering measures ,in
different plant measures(fish-scale pit), shrubs are more suitable for
nutrient conservation on the upper slope. SOC (25.04g/kg) and TN
(2.13g/kg) contents of coniferous trees were the highest, and AK
(170.89mg/kg) content of broad-leaved trees was the highest;3) Plant
combined with engineering measures ,among the different engineering
measures(oriental arborvitae), the overall nutrient condition of level
bench was the best (SOC: 33.33 g/kg, TN: 2.21 g/kg, AK: 139.44 mg/kg),
and the stone dike terrace was poor (SOC: 18.19 g/kg, TN: 1.53 g/kg, AK:
118.11 mg/kg);4) The most suitable soil and water conservation measure
was level bench of coniferous tree combine 9 measures. Soil nutrient
contents are determined by plant characteristics, engineering measures
and soil loss. In all plots, there were significant correlations between
the three nutrients (P < 0.01), showing an strong effects of
conservation measures on soil nutrients.