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Soil aggregate stability and associated structure affected by long-term fertilization for a loessial soil on the loess plateau of China

100%

Tuo D., Xu M., Li Q., Liu S.

Polish Journal of Environmental Studies

2017

tom 26

nr 2

Agricultural management practices play an important role in soil structure and fertility. However, there is a lack of knowledge on the effects of long-term fertilization on aggregate structure in the Loess Plateau region in China. This study was devoted to examining the responses of soil aggregate stability and associated structure to fertilizers over 19 years under a soybean (Glycine max L.)-corn (Zea Mays) rotation. Treatments included unfertilized control (CK); nitrogen (N), phosphorus (P), and NP chemical fertilizers; and manure (M) and MN, MP and MNP organic/chemical combinations. The results showed that the water-stable aggregates, mean weight diameter, geometric mean diameter, aggregate state, and aggregate degree decreased in chemical fertilizers (N, P, and NP). However, it increased in all treatments containing manure (M, MN, MP, and MNP) compared to the CK. The changes in dispersion rate and fractal dimension were opposite to those indicators in all treatments. The applications of chemical fertilizers do guarantee an increase in crop yield, but only organic fertilizers significantly improved soil structure. These results suggest that manure’s incorporation into loessial soil is a preferred strategy for sustainable soil management.

Structural stability and erodibility of soil in an age sequence of artificial Robinia pseudoacacia on a hilly loess Plateau

88%

Li Q., Liu G., Zhang Z., Tuo D., Miao X.

Polish Journal of Environmental Studies

2016

tom 25

nr 4

To assess the erosion resistance of soils beneath Robinia pseudoacacia (Robinia), soil anti-scouribility (AS) and its relevant structural properties in an age sequence of 4-, 11-, 24-, 37-, and 43-year-old Robinia, lands and one adjacent cropland (CK) were studied through a simulated flow scouring experiment on a hilly Loess Plateau. Soils from the six-stage Robinia planting were hypothesized to differ in their resistance to scouring, and these differences are believed to be related to differences in their soil physical properties. The results showed that: 1) Robinia planting significantly reduced sediment compared with CK. Changes in the sediment over scouring time were best described by a negatively exponential function. 2) Compared with CK, the average soil bulk density beneath Robinia significantly decreased by 14.5% in the surface (0-20 cm) soil layer and non-significantly by 5.7 and 3.3% in the middle (20-40 cm) and lower (40-60 cm) soil layers, respectively. Soil aggregate content and shear strength increased while soil disintegration rate decreased significantly in the three soil layers with Robinia stages. Mean 6.8, 1.6, and 0.2 times were increased in soil AS. 3) Linear regression equations between soil AS and the soil structural properties were well fitted in the surface and middle soil layers. Soil aggregate content and root biomass were the key factors, which contributed 71.0 and 90.8% to the reinforcement of soil AS beneath Robinia in the hilly Loess Plateau.

Ograniczanie wyników

2 Polish Journal of Environmental Studies

2 Li Q.

2 Tuo D.

1 Liu G.

1 Liu S.

1 Miao X.

1 Xu M.

1 Zhang Z.

1 2017

1 2016

Wyniki wyszukiwania

Soil aggregate stability and associated structure affected by long-term fertilization for a loessial soil on the loess plateau of China

Structural stability and erodibility of soil in an age sequence of artificial Robinia pseudoacacia on a hilly loess Plateau