Impact of Climate Change on Soil Moisture

Impact of Climate Change on Soil Moisture

Climate change not only has a great influence on the global temperature, but also has an indispensable change in the moisture in the soil. Studying the impact of climate change on soil moisture can, to some extent, guide the work of agricultural irrigation and forestry production. Using a soil moisture measuring instrument, we can obtain the soil moisture we want, and use soil moisture for soil moisture in different regions at different times. The measuring instrument can measure the impact of climate change on soil moisture.

In addition to the differences that may occur in experiments and model simulations themselves, some objective conditions also limit the accuracy of the conclusions that can be drawn. For example, climate change is caused by the increase of CO2 concentration, and the increase of CO2 concentration will influence the stomatal resistance to a certain extent and further affect vegetation evaporation by affecting vegetation growth.

In addition, the GCM simulation results show that the temperature increase itself has differences between seasons and day and night, and usually the winter and nighttime temperatures increase more. This determines that, in the season when the vegetation evaporates and time, such as the summer, the warming may be relatively low, The increase in evaporation brought about by the increase in temperature is relatively weak, and these factors all determine that model simulation results may increase the impact of climate change on soil moisture. In particular, due to the lack of consideration of the impact of elevated CO2 concentrations, it was determined that the experimental conclusions were based more or less on the effects of one or more factors on soil moisture and vegetation, rather than the overall climate change scenario.

1 Correlation between precipitation changes and vegetation productivity

Field experiments show that precipitation and soil moisture in the Taihang Mountain area are the sensitive factors affecting vegetation growth. Increasing the precipitation by 10% and 20% on the existing basis will significantly increase the productivity of the vegetation. Conversely, reducing precipitation will produce vegetation growth. Negative effects, combined with experimental results, the increase or decrease of precipitation by 10% may affect the productivity of the vegetation by about 15%.

2 Effects of temperature and precipitation changes on soil moisture

Field experiments show that the change in soil water content is basically consistent with the change trend of precipitation. Under the premise of constant temperature, increasing precipitation generally increases soil moisture content. The results of soil moisture changes under different warming and precipitation changes simulated by the WAVES model show that the negative effects of warming and precipitation reduction on soil moisture are obvious, and the climate model with increased precipitation generally improves the soil moisture status, but the precipitation increases by 10%. The positive effect of soil moisture was largely offset by the warming of 30C.

3 Possible Effects of Temperature on Vegetation Productivity

Because the model used in the simulation did not change the precipitation (T3) vegetation (LAI) in the current experiment, vegetation growth in the semi-humid and semi-arid regions of the Taihang Mountains was also controlled by soil moisture, thus estimating the vegetation changes in the future global change scenarios. It may be consistent with the trend of soil water changes simulated by the WAVES model. The temperature rise alone will have negative effects on the ecosystem of low mountain areas in the Taihang Mountains because of its increased evapotranspiration and reduced soil moisture. However, due to the limitations of this study, the degree of influence of the warming on the vegetation is still difficult to obtain an exact answer, but due to precipitation An increase of 10% may increase the productivity of the vegetation by 15%, while the increase in temperature of 30C basically offsets the positive effect of a 10% increase in precipitation on soil moisture. It is thus concluded that for every 10C increase in temperature, the productivity of vegetation may decrease by 5%.

Of course, there are differences between the Lysimeter and field vegetation conditions in the field experiment. For example, the Lysimeter will generally accelerate the soil water loss rate, and the thickness of the experimental soil layer (85 cm) will be much thicker than the actual mountain soil. These may cause The differences between simulated results and soil moisture changes under real climatic conditions, and the corresponding error in the phantom model itself, all of which determine that the experimental and simulation results may have some errors, and the conclusions need to be further Experimental and simulation data to test.

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