坝上地区老芒麦草地土壤水分和生物量变化特征  

Seasonal characteristics of soil water and biomass of siberian wildrye grass(Elymus sibiricus L.) in Bashang Plateau

作　　者：王皓[1] 李子忠[1] 

机构地区：[1]中国农业大学资源与环境学院,北京100193

出　　处：《干旱地区农业研究》2009年第3期90-95,共6页Agricultural Research in the Arid Areas

基　　金：国家自然科学基金项目(30471228);国家科技部科技支撑项目(2006BAD16B01)

摘　　要：于2004-2007年利用TDR对田间土壤水分动态进行监测,研究了该地区不同降水年型下多年生老芒麦草地土壤水分的动态变化特征,同时对该地区老芒麦的耗水特性和生长特征进行了分析。结果表明,土壤水分在6月下旬达最低值,7月中旬牧草头茬草收割后土壤贮水开始迅速增加,至8月份雨季结束后又迅速下降。老芒麦的生物量以头茬草为主,干物质的主要积累时期为6月下旬到7月初的拔节抽穗期。该地区牧草的主要干物质累积时期和土壤水分的充分供给时期存在严重的不一致,建议进行土壤水分季节调控或人工草地的生育期调节研究。To investigate the seasonal characteristics of soil water storage and crop growth in semiarid Bashang Plateau, field experiments were conducted during 2004 - 2007. The soil water was measured by TDR, and the water consumption and growth of siberian wildrye grass were determined under the condition of different precipitation years. The results showed that soil water storage decreased to the wilting point at late June, increased quickly during the rainy season after the first cutting, and decreased again after the rainy season. However, the forage yield of siberian wildrye grass was dominated by the first cutting, and the most critical growing stage was the arid elongating-heading stage from late June to early July. Therefore, the conflict existed between the rapidly growing of siberian wildrye grass and soil water supply in this region. Some ways should be studied to regulate the seasonal distribution of soil water or the growing stages of forage grass.

关 键 词：老芒麦草地 土壤水分变化 生物量变化 人工草地 坝上地区 

分 类 号：S152.75[农业科学—土壤学]