喷灌条件下土壤水分空间分布特性研究

李久生; 雷志栋; 杨诗秀

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喷灌条件下土壤水分空间分布特性研究

李久生, 雷志栋, 杨诗秀

文章导航 > 水科学进展 > 1998 > 9(1): 7-14

李久生, 雷志栋, 杨诗秀. 喷灌条件下土壤水分空间分布特性研究[J]. 水科学进展, 1998, 9(1): 7-14.

引用本文:

李久生, 雷志栋, 杨诗秀. 喷灌条件下土壤水分空间分布特性研究[J]. 水科学进展, 1998, 9(1): 7-14.

Li Jiusheng, Lei Zhidong, Yang Shixiu. Spatial Variability of Soil Moisture Under Sprinkler Irrigation[J]. Advances in Water Science, 1998, 9(1): 7-14.

Citation:

Li Jiusheng, Lei Zhidong, Yang Shixiu. Spatial Variability of Soil Moisture Under Sprinkler Irrigation[J]. Advances in Water Science, 1998, 9(1): 7-14.

喷灌条件下土壤水分空间分布特性研究

1.
中国农业科学院农业气象研究所北京 100081;
2.
清华大学水利水电工程系北京 100084

基金项目: 中国博士后科学基金;国家自然科学基金

详细信息

中图分类号: S275.5;P641.131

Spatial Variability of Soil Moisture Under Sprinkler Irrigation

1.
Agrometeorology Institute, Chinese Academy of Agricultural Sciences, Beijing 100081;
2.
Department of Hydraulic Engineering, Tsinghua University, Beijing 100084

摘要: 分别在火山灰土和砂壤土两种土壤上进行了不同喷灌均匀系数和灌水量的土壤水分空间分布试验。对土壤干容重空间分布规律的研究表明,干容重在空间的随机分布可用正态分布来表示。为了确定喷灌洒水量和土壤含水率的空间结构,分别计算了它们的半方差和自相关函数。结果指出,喷灌洒水量的相关距离为h～6m,该距离随风速呈增大趋势;灌水停止4h后的土壤含水率的相关距离为5～6m,喷灌均匀系数对该距离无明显影响。田间试验还表明,喷灌洒水在土壤中的分布要比其在地表的分布均匀得多,土壤水分空间分布的均匀性主要取决于土壤初始含水率的均匀程度和灌水量。
- 喷灌 /
- 土壤含水率 /
- 空间分布 /
- 均匀系数 /
- 相关距离
Abstract: Crop yield response to sprinkler irrigation depends mainly on the spatial distributions of applied water within the root zone,however,we have quite limited know ledge aboutit.The redistributions of water in the soil were therefore observed under the conditions of sprinkler uniformity (CU) ranging from 53% to 98% and application amount from 5 to 58 mm,on two different soil types—a volcanic ash soil and a sandy loam soil.The distribution of bulk density was examined and showed that it can be represented by a normal distribution function for both soil types.The autocorrelation functions and semivariograms were calculated for water application and soil water content 24 h after application ceased to determine their spatial dependency.Sprinkler water application demonstrated a correlative length of 4 to 6 m,which increased with wind velocity during the experiments,but water applied by a rainfallevent was spatially independent.Soil water contents for 24 hrs after water application ceased exhibited a correlative length of 5 to 6m and appears to be independent of application uniformity.The field experiments also showed that the water was more uniformly distributed in the soil than sprinkler water applied on the ground surface,and the uniformity of water in the soil was closely related to the uniformity of initial soil water content and the total water applied.
- sprinkler irrigation /
- soil water content /
- spatial variability /
- uniformity /
- correlative length

[1]

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喷灌条件下土壤水分空间分布特性研究

1. 中国农业科学院农业气象研究所北京 100081;

2. 清华大学水利水电工程系北京 100084

基金项目: 中国博士后科学基金;国家自然科学基金

收稿日期: 1996-10-08
修回日期: 1997-04-05
刊出日期: 1998-01-25

中图分类号: S275.5;P641.131

关键词:

喷灌 /

土壤含水率 /

空间分布 /

均匀系数 /

English Abstract

Spatial Variability of Soil Moisture Under Sprinkler Irrigation

1. Agrometeorology Institute, Chinese Academy of Agricultural Sciences, Beijing 100081;

2. Department of Hydraulic Engineering, Tsinghua University, Beijing 100084

Received Date: 1996-10-08
Rev Recd Date: 1997-04-05
Publish Date: 1998-01-25

Keywords:

Abstract: Crop yield response to sprinkler irrigation depends mainly on the spatial distributions of applied water within the root zone,however,we have quite limited know ledge aboutit.The redistributions of water in the soil were therefore observed under the conditions of sprinkler uniformity (CU) ranging from 53% to 98% and application amount from 5 to 58 mm,on two different soil types—a volcanic ash soil and a sandy loam soil.The distribution of bulk density was examined and showed that it can be represented by a normal distribution function for both soil types.The autocorrelation functions and semivariograms were calculated for water application and soil water content 24 h after application ceased to determine their spatial dependency.Sprinkler water application demonstrated a correlative length of 4 to 6 m,which increased with wind velocity during the experiments,but water applied by a rainfallevent was spatially independent.Soil water contents for 24 hrs after water application ceased exhibited a correlative length of 5 to 6m and appears to be independent of application uniformity.The field experiments also showed that the water was more uniformly distributed in the soil than sprinkler water applied on the ground surface,and the uniformity of water in the soil was closely related to the uniformity of initial soil water content and the total water applied.

李久生, 雷志栋, 杨诗秀. 喷灌条件下土壤水分空间分布特性研究[J]. 水科学进展, 1998, 9(1): 7-14.

引用本文:

李久生, 雷志栋, 杨诗秀. 喷灌条件下土壤水分空间分布特性研究[J]. 水科学进展, 1998, 9(1): 7-14.

Li Jiusheng, Lei Zhidong, Yang Shixiu. Spatial Variability of Soil Moisture Under Sprinkler Irrigation[J]. Advances in Water Science, 1998, 9(1): 7-14.

Citation:

Li Jiusheng, Lei Zhidong, Yang Shixiu. Spatial Variability of Soil Moisture Under Sprinkler Irrigation[J]. Advances in Water Science, 1998, 9(1): 7-14.