西峰黄土高原麦田土壤水分的垂直分布  

Vertical Distribution of Soil Moisture in Xifeng Wheat Field of Loess Plateau

作　　者：张洪芬[1] 王劲松[1] 黄斌 

机构地区：[1]中国气象局兰州干旱气象研究所,甘肃兰州730020 [2]甘肃省庆阳市气象局,甘肃西峰745000

出　　处：《土壤通报》2006年第6期1081-1085,共5页Chinese Journal of Soil Science

基　　金：中国科技部科研院所社会公益研究项目"中国干旱气象灾害监测预警方法研究"(2004DIB5J192);甘肃省气象局项目"西北干旱指数研究"(2005-02)共同资助

摘　　要：利用西峰1989—2005年冬小麦生长期的土壤水分含量，分析了麦田土壤水分的旬月变化特征、垂直分布特征和土壤水分含量与降水量的关系，以及冬小麦生长期土壤总含水量与冬小麦产量间的关系。结果表明：西峰土壤水分含量具有明显的时间变化特征，8—11月与次年3—7月的实测土壤水分变化先增加再减少；垂直变化明显，0—40cm为多变层，40—110为缓变层，110—200cm为稳定层；垂直分布有明显的规律性，表现为旱季深层水分有向上传输的延迟，雨季水分有向下渗透的延迟；其年际变化振荡比较明显，呈多波动年际变化，冬小麦干粒重与生长期内土壤平均含水量呈正相关，相关系数为0．75，达到α=0．01置信度相关水平。We investigated the soil moisture changing and vertical distribution characteristic by using the data of soil moisture from year 1989 to 2005 in the winter wheat growing period in Xifeng. The results indicated that soil moisture had obvious variation characteristic, being increasing first, from August to November and then declined from next March to July There was an obvious vertical distribution pattern, which was divided into the changeable level （from 10 to 40cm）, the slow changing level （from 40 to 110） and the stable level （from 110 to 200cm）. The obvious regularity in the vertical distribution showed that the deep - seated soil moisture had a antrose delay in dry seated and an osmotic adown delay in rainy season. Soil moisture fluctuated year by year and there was positive correlation between the grain weight of a thousand seeds and the average soil moisture content during the whole growing period.

关 键 词：西峰 土壤水分 垂直分布 时间分布 小麦产量 

分 类 号：S152.7[农业科学—土壤学]