| 不同水质膜下滴灌棉田盐分空间变异特征 |
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| 引用本文： | 栗现文,靳孟贵.不同水质膜下滴灌棉田盐分空间变异特征[J].农业机械学报,2014,45(11):180-187. |
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| 作者姓名： | 栗现文 靳孟贵 |
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| 作者单位： | 西北农林科技大学;西北农林科技大学;西北农林科技大学 |
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| 基金项目： | “十二五”国家科技支撑计划资助项目(2011BAD29B08)和新世纪优秀人才支持计划资助项目(NCET-12-0473) |
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| 摘 要： | 为评价不同水质膜下滴灌棉田土壤盐分空间分布及变异性,采用EM38-MK2型电磁感应仪对微咸及淡水滴灌田块进行盐分调查。解译模型获得的土壤含盐质量比描述性统计特征表明,微咸水滴灌的积盐程度高于淡水滴灌,但其变异系数相对较小。采用GS+软件拟合最优半方差函数模型,微咸水处理为指数模型,淡水处理为高斯模型,均表现为强的空间相关性;微咸水处理变程大于淡水处理,增加了土壤盐分的空间相依性。Kriging空间插值及变异分析表明,淡水滴灌棉田土壤盐分微域及全域空间变异程度强于微咸水滴灌,二者均存在影响棉花出苗的盐斑。建议用水紧张时,可基于EM38-MK2型电磁感应仪的盐分调查结果,重点淋洗盐斑集中分布区域,以节水增产。
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| 关 键 词： | 微咸水 膜下滴灌 干旱区 空间变异 电磁感应 半方差函数 |
| 收稿时间： | 7/1/2014 12:00:00 AM |
Spatial Variability of Cotton Field Salinity under Mulched Drip Irrigation with Brackish and Fresh Water |
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| Li Xianwen and Jin Menggui.Spatial Variability of Cotton Field Salinity under Mulched Drip Irrigation with Brackish and Fresh Water[J].Transactions of the Chinese Society of Agricultural Machinery,2014,45(11):180-187. |
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| Authors: | Li Xianwen and Jin Menggui |
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| Institution: | Northwest A&F University;Northwest A&F University;Northwest A&F University |
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| Abstract: | Distribution uniformity (DU) and Christiansen uniformity coefficient (CU) are two important indicators for evaluating the hydrodynamic performance and irrigationg quality of sprinkler irrigation system. In order to research the impact of the pressure, sprinkler combinations and interpolation methods on the distribution uniformity and Christiansen uniformity coefficient, CU and DU were computed by linear interpolation, cubic interpolation, cubic spline twice interpolation, inverse distance weighting method and plane interpolation method with two combinations (rectangular and regular triangle), and 1m sampling space. Using the experimental data of FY RB-471 sprinklers without wind simulated the water distribution under different pressures. The results showed that CU calculated form rectangular combination date were less than form regular triangle combination date by 1.56%~4.77%. Similarly, DU calculated form rectangular combination date were less than form regular triangle combination date by 4.26%~9.19%. Different interpolation methods for the calculation results of CU and DU are not obvious, while the pressure is an important factor for affecting the sprinkler uniformity. |
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| Keywords: | Sprinkler irrigation Sprinkler Uniformity coefficient Water distribution Dynamic simulation |
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