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为了更好地认识喀斯特地区土壤水分运动规律,以贵州石漠化地区土壤为研究对象,采用模拟降水法,通过对石漠化地区土壤水分的临界饱和持水量、水分渗漏速率及水分蒸散速率等参量的分析,研究其水分运动规律。结果表明:模拟降水量130~140 mm为渗漏临界点,此时达到饱和田间持水量;145~165 mm时,10 min内达到最大下渗速率;超过165 mm后,在前5 min就可达到最大值;而小于临界点时,水分均以蒸散方式损失,以平均0.00001122 g/s的速度减少。此研究发现了喀斯特石漠化地区土壤水分运动的基本规律,并提供了相关的基础数据,对今后的进一步研究以及喀斯特生态系统的保护具有重要意义。
In order to better understand the law of soil moisture movement in karst regions, taking the soil in the rocky desertification area of Guizhou as the research object and the simulated precipitation method, the critical saturated water holding capacity, water leakage rate and water evapotranspiration rate Analysis of other parameters, study the law of water movement. The results showed that the simulated rainfall 130-140 mm was the critical point of the leakage, and the saturated water field was reached at this time. The maximum infiltration rate was reached within 10 min at 145-165 mm. Reach the maximum; and less than the critical point, the water loss by evapotranspiration to an average of 0.00001122 g / s speed reduction. The study found the basic rules of soil water movement in karst rocky desertification area and provided relevant basic data, which is of great significance for further study and protection of karst ecosystem.