【作者】 张洪芬； 王劲松； 郭江勇；

【Author】 ZHANG Hong-fen1,2, WANG Jin-song1 ( 1. Key laboratory of Arid Climatic Change and Reducing Disaster of Gansu province, Gansu Lanzhou,730020; 2. Qingyang Meteorological Bureau, Gansu Xifeng, 74500)

【机构】 中国气象局兰州干旱气象研究所甘肃省干旱气候变化与减灾重点实验室； 甘肃省庆阳市气象局；

【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,呈多波动变化年际变化明显,冬小麦千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信度相关水平。更多还原

【Abstract】 It was analyzed the soil moisture in the ten-day period and month changing characteristic, the vertical distribution characteristic and the relations between soil moisture content and precipitation, as well as the relations between soil total water content and winter wheat output, using the data of soil moisture from the year 1989 to 2005 in winter wheat vegetal period of Xifeng. The result indicated that, it has the obvious time variation characteristic which was increasing first and then reduces ,from August to November and the next year’s March to July ‘s soil moisture change; it has obvious vertical variation which was divided for the changeable level(from 10 to 40cm), the slow changing level(from 40 to 110) the stable level(from 110 to 200cm); it has the obvious regularity in the vertical distribution which performanced that the soil moisture of deep-seated has a antrorse delay in dry season and has a osmotic adown delay in rainy season; it has obvious year border change vibration assumeing multiwave moves; the winter wheat’s weight of a thousand seeds and the vegetal period the soil average moisture content presents the correlation whose correlation coefficient is 0.75 and achieves alpha α=0.01 confidence level.更多还原