| 不同种植年限压砂地土壤水分对降水脉动的响应 |
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| 引用本文： | 赵文举,郁文,马孝义,宋建树.不同种植年限压砂地土壤水分对降水脉动的响应[J].水土保持通报,2014(6):18-21. |
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| 作者姓名： | 赵文举 郁文 马孝义 宋建树 |
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| 作者单位： | 兰州理工大学 能源与动力工程学院, 甘肃 兰州 730050;兰州理工大学 能源与动力工程学院, 甘肃 兰州 730050;西北农林科技大学 旱区农业水土工程教育部重点实验室, 陕西 杨凌 712100;兰州理工大学 能源与动力工程学院, 甘肃 兰州 730050 |
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| 基金项目： | 国家自然科学基金项目"压砂地土壤水分时空变异理论与模型研究"(51269008);国家自然科学基金项目(51279167);甘肃省高等学校科研项目计划资助(2013B-019);兰州理工大学红柳青年教师培养计划资助项目(Q201310) |
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| 摘 要： | 采取野外大田试验,定量分析了7.1和1.9mm不同降水脉动下3d内不同种植年限压砂地土壤含水率随时间的变化规律。试验结果表明,压砂地土壤含水率与时间呈指函数正相关关系,相关系数介于0.938 1~0.987 3,土壤含水率增加量表现为:新压砂地中压砂地老压砂地。降水脉动为7.1mm时,新压砂地、中压砂地、老压砂地在降水后第3天土壤含水率比降水前分别增加了42.3%,27.4%和23.2%,平均含水率较裸地分别增加了52.7%,45.5%和38.2%。降水脉动为1.9mm时,土壤含水率分别增加了22.6%,21.7%和7.6%,平均含水率较裸地分别增加了171.8%,156.4%,110.3%。两次降水土壤平均含水率均表现为:新压砂地中压砂地老压砂地裸地。降水分别为7.1和1.9mm时,压砂地土壤含水率分别在降水后第7天和第5天开始出现缓慢下降。和裸地相比,压砂地显著提高了降水的利用效率。
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| 关 键 词： | 压砂地 降水脉动 土壤水分 入渗 |
| 收稿时间： | 2013/11/18 0:00:00 |
| 修稿时间： | 2013/12/8 0:00:00 |
Responses of Soil Moisture of Gravel-mulched Field to Precipitation Fluctuation of Different Planting Years |
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| ZHAO Wen-ju,YU Wen,MA Xiao-yi and SONG Jian-shu.Responses of Soil Moisture of Gravel-mulched Field to Precipitation Fluctuation of Different Planting Years[J].Bulletin of Soil and Water Conservation,2014(6):18-21. |
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| Authors: | ZHAO Wen-ju YU Wen MA Xiao-yi and SONG Jian-shu |
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| Institution: | School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China;School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China;Key Laboratory for Agricultural Soil and Water Engineering in Arid Area of Ministry of Education, Northwest A & F University, Yangling, Shanxi 712100, China;School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China |
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| Abstract: | Taking the field experiment, the change of gravel-mulched field soil moisture of different planting years within three days after the precipitation pulses of 7.1 and 1.9 mm was analyzed quantitatively. The results showed that soil moisture content of gravel-mulched field had a positive exponential relationship with time, and the correlation coefficient ranges from 0.9381 to 0.9873, the increase of soil moisture content showed an order as following:new gravel-mulched field >middle gravel-mulched field >old gravel-mulched field. When precipitation pulses was 7.1 mm, soil moisture content of new gravel-mulched field, middle gravel-mulched field and old gravel-mulched field increased by 42.3%, 27.4% and 23.2% respectively on the third day after rainfall, and the average moisture content increased by 52.7%, 52.7% and 45.5% respectively than that of bare land. When precipitation pulses was 1.9 mm, the soil moisture content increased by 22.6%, 27.1% and 7.6% respectively, and the average moisture content increased by 171.8%, 156.4%, and 110.3% respectively than that of bare land. When precipitation pulses was 7.1 mm and 1.9 mm, the moisture content in gravel-mulched field started to decrease in 7 days and 5 days after precipitation respectively. Both of two rainfall showed that the average soil moisture content was that new gravel-mulched field >middle gravel-mulched field >old gravel-mulched field >bare field. Compared with the bare land, gravel-mulched field can improve the utilization efficiency of the rainwater. |
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| Keywords: | gravel-mulched field precipitation pulses soil moisture infiltration |
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