| High-standard farmland construction is an important initiative to establish intensive and efficient agriculture, its implementation through various land consolidation measures and related facilities to complete, and the implementation of the various land consolidation measures will produce certain influence to the soil environment. This article selects high standard farmland construction project in Western of Chongqing as the research object, respectively for bench border area, a dry land into paddy field control area and the field of plastic zone in three different regulation for stratified sampling plots. Comparative Analysis of the change at the same soil layer depth before and after, different depths in the soil profile in the vertical direction, and then analysis the influence of the high standard farmland construction in the area of the soil environment. Finally, have been measured soil physical and chemical indicators Evaluation Model, soil quality remediation three different land consolidation area before and after a brief evaluation, the main conclusions are as follows:(1)Through the soil water content, bulk density, porosity and texture of the physical indicators composition of measurement that: Overall, soil bulk density in the vertical direction from the surface to the bottom showing a gradual increasing trend, soil control area vertical soil bulk density varies significantly, and after finishing the change is not significant, indicating a certain extent, so that the layers between the soil profile more uniform. Variation of soil depth from the same point of view before and after finishing, 0~20cm, 20~40cm soil bulk density have undergone more significant changes, which illustrate various kinds of land consolidation measures will produce certain effect on the soil bulk density, soil porosity due degree is calculated from the basis of the soil bulk density and soil bulk density and a negative correlation, so the change in soil porosity and soil bulk density contrast.Has certain changes in soil moisture from the surface to the bottom but not significantly, the changes of control area and distribution area in the vertical direction present inconsistency, look from the average, the control area shows the tendency of decrease from top to bottom water content, but after finishing presents increasing trend from top to bottom; From the same characteristics of the changes before and after the soil depth, soil water content was not significant.Judging from the soil profile in the vertical direction, there is no significant change in clay, silt, sand of Jota remediation area and the terraces shaping area from top to bottom, and dry land to paddy field remediation zone control area and grit particles have a certain the degree of change; from the horizontal contrast the same depth before and after the renovation, the front and back of each soil remediation of Jota remediation area and terraces shaping zone will not change significantly, dry land to paddy field remediation zone control area surface layer 0 ~ 20 cm of silt and sand produced a certain change. Overall, the soil texture and structure of land consolidation area did not have much impact.(2)From the vertical direction of soil profile variation characteristics, control area and distribution area, are all increased with the increase of depth, the index of nutrient content in gradually reduce, but reduce the size of the inconsistencies, the control area change significantly, no significant change after finishing, it shows that after land consolidation, soil profile in reducing, the soil nutrient content between gap indirectly reflects the disturbance action of land consolidation of the soil profile; From the same depth of lateral comparison before and after the run, bench border control area and the field of plastic area most indicators before and after the change is not significant, while dry land to paddy field remediation zone change significantly after finishing, and the nutrient indexes increased dramatically.(3)By matter-element model of comprehensive correlation calculation result determination shows that bench border control area and the field before and after the renovation, the plastic zone of soil quality to â…£,dry land to paddy field remediation zone by the contrast area â…¥ level into the â…£ after finishing level, land quality has improved, the reason is mainly rice planting and fertilization factors, sharply higher content of nutrient elements in the region, but the quality of the area of land as a whole remains to be improved.(4)Various land consolidation measures would have some impact on the soil environment, mainly reflected more evenly between the layers of the soil profile finishing, excluding artificial cultivation, fertilization and other factors, land consolidation will not have a large change in soil quality, achievements of high achievement standard farmland construction more embodied by improving related facilities. |
