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| 咸水灌溉沙地后的水盐运移规律 | |
| 引用本文： | 黄强,李生秀,宋郁东.咸水灌溉沙地后的水盐运移规律[J].土壤学报,2003,40(4):547-553. |
| 作者姓名： | 黄强 李生秀 宋郁东 |
| 作者单位： | 1. 中国科学院新疆生态与地理研究所,乌鲁木齐,830011;西北农林科技大学,陕西杨凌,712100 2. 西北农林科技大学,陕西杨凌,712100 3. 中国科学院新疆生态与地理研究所,乌鲁木齐,830011 |
| 基金项目： | 中国西部干旱区生态环境演变与调控研究(G1999043506)和中国科学院西部之光项目资助 |
| 摘 要： | 实地观测不同深度土壤含水率、基质势、土壤溶液含盐率 ,利用定位通量法和盐分均衡法 ,研究了咸水小畦灌条件下塔克拉玛干沙漠土壤的水盐运移规律。结果表明 :(1)在小畦灌条件下 ,停止灌水后 2 4h ,91.2 5 %的灌水渗入 15 0cm土层以下 ;停止灌水后 72h ,96.6%的灌水渗入 15 0cm土层以下 ,此时 ,0～ 15 0cm土层土壤平均含水率为 0 .0 5 3cm3cm- 3,此后土壤含水率缓慢下降。 (2 )秋季停灌后 ,土壤表面蒸发量在 2～ 6mm。停灌后 2h ,上行水区域在 0～ 2 0cm土层 ;停灌后 60h ,上行水区域在 0～ 90cm ;此后至停灌后 14 4h ,上行水深度稳定在地下 90cm。 (3 )咸水灌溉后 ,80cm以上土层土壤溶液含盐率明显下降 ,以下土壤溶液含盐率变化不明显。停灌 2 4h后 ,0～ 15 0cm土层液相盐分储量开始降低 ,至停灌后 14 4h ,0～ 15 0cm土层液相储盐量相当于灌水前的 5 3 .46%。 (4 )停止灌水后 ,10 0cm× 10 0cm地面日平均积盐量在 13～ 3 5g。 |
| 关 键 词： | 塔克拉玛干沙漠 咸水灌溉 水盐运移 |
| 收稿时间： | 2/7/2002 12:00:00 AM |
| 修稿时间： | 2002年2月7日 |
THE MOVEMENT OF WATER AND SALT IN SANDY LAND AFTER IRRIGATED WITH SALINE WATER |
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| Huang Qiang,Li Sheng-xiu and Song Yu-dong.THE MOVEMENT OF WATER AND SALT IN SANDY LAND AFTER IRRIGATED WITH SALINE WATER[J].Acta Pedologica Sinica,2003,40(4):547-553. | |
| Authors: | Huang Qiang Li Sheng-xiu and Song Yu-dong |
| Institution: | Huang Qiang 1,2 Li Sheng-xiu 2 Song Yu-dong 1 |
| Abstract: | A field experiment for studying water and salt movement in soil after basin irrigated by saline ground water was conducted in the center of Takelamakan Desert.A series of data about soil water potential,soil water content and EC value of soil solution at different depths along the soil profile were obtained at different times after stopping irrigation.By analyzing these data using method of water and salt balance,some results of water and salt movement in soil were obtained as follows:(1)After stopping irrigation 24 hours, 8.85% of the amount of irrigation water would be contained in the soil layer of 0~150 cm.After stopping irrigation 72 h,3.4% of the amount of irrigation water would be contained in layer of 0~150 cm,and average soil water content in this soil layer was 5.3%.After this time,soil water content in this layer reduced slowly.(2)During the time from stopping irrigation to seventh day after stopping irrigation in autumn,the daily evaporation water amount was between 2~6 mm.2 hours after stopping irrigation,soil water contained in the layer of 0~20 cm moved upward to the surface of ground,while 72~144 hours after stopping irrigation,the upward region of soil water extended to the depth of 90 cm underground. (3)When irrigated by saline water with EC value of 6.3 mS cm-1,The EC value of soil solution reduced obviously in upper part of the layer and was almost same as that of before irrigation in lower part of the layer.24 h after stopping irrigation,the amount of salt contained in solution of layer of 0~150 cm was less than that of before irrigation,while 144 h after stopping irrigation,it was only 53.46% of that of before irrigation.(4)After stopping irrigation,the daily amount of salt accumulated on ground surface with area of 100 cm×100 cm would be 13~35 g in autumn. |
| Keywords: | Takelamakan Desert Saline water irrigation Wa ter and salt movement |
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