典型草原返青期土壤温度和水分动态变化  

The dynamics changes of soil temperature and soil moisture at returning green stage in typical steppe

作　　者：买小虎[1] 张玉娟[2] 张英俊[2] 师尚礼[1] 黄顶[2] 

机构地区：[1]甘肃农业大学草业学院/草业生态系统教育部重点实验室/甘肃省草业工程实验室/中-美草地畜牧业可持续发展研究中心,甘肃兰州730070 [2]中国农业大学动物科技学院,北京100193

出　　处：《草原与草坪》2014年第2期51-56,共6页Grassland and Turf

基　　金：公益性行业(农业)科研专项"不同区域草地承载力与家畜配置"(200903060);"牧区家庭牧场资源优化配置技术模式研究与示范"(201003019);"半干旱牧区天然打草场培育及利用技术研究与示范"(201303060);国家牧草产业技术体系(CARS-35)资助

摘　　要：测定了自然条件下2012～2013年典型草原返青期土壤温度和水分含量变化。结果表明：在返青早期（3月1～4月5日）、返青中期（4月5～25日）和返青后期（4月25～5月15日）,土壤表层（0～15 cm）平均温度分别为-0.8,6.4和10.4℃,中层（15～30 cm）平均温度分别为1.9,2.8和6.3℃,深层（30～120 cm）土壤平均温度分别为-1.2,0.7和2.7℃。在典型草原返青期,表层土壤温度随空气温度变化较为明显。表层土壤体积含水量随返青期延伸而逐渐降低,中层和深层土壤体积含水量随返青期延伸而逐渐升高。在返青早期,表层土壤体积含水量明显大于中层和深层；在返青中期和后期,中层和深层的土壤体积含水量明显大于表层。表层土壤体积含水量与土壤温度呈负相关,中层和深层土壤体积含水量与土壤平均温度呈正相关。The study tested the dynamics changes of soil temperature and soil moisture at the returning green period in typical steppe in 2012 and 2013 .The results showed that the soil temperatures at 0 ～ 15 cm depth were -0.8,6.4 and 10.4 ℃,respectively,during the early（15 March～5 April）,medium（5 April ～25 A-pril）and late （25 April～15 May）of greening period.While the soil temperatures were 1.9,2.8 and 6.3 ℃ at 15～30 cm depthand were -1.2,0.7 and 2.7 ℃ at 30～120 cm depth,respectively.The soil temperatures of surface layer （0 ～ 15 cm depth）increased evidently with air temperature.The soil moisture of surface layer decreased with air temperature with the returning green period prolonging,but it increased at the medium layer（15～30 cm depth）and deep layer（30 ～ 120 cm depth）.During the early greening period,the soil moisture of the surface layer was evident higher than that of the medium layer and the deep layer.But the soil moisture content of the medium layer and the deep layer was evident higher than that of surface layer at the medium and late greening stage.The correlation between soil mositure and soil temperature was negative at surface layer depth, but it was positive at the medium and the deep layer during the greening period.

关 键 词：典型草原 返青期 土壤温度 土壤水分 

分 类 号：S812[农业科学—草业科学]