摘要
本研究于1988年4～10月在地处黄土高原北部边缘丘陵区的内蒙古和林格尔县境内进行。在全面了解土壤物理及水分物理性质的基础上,较系统地研究了本地区土壤水分变化与苜蓿生长间的相互关系。研究结果表明,种植苜蓿第二年生长繁茂,根系发达,苜蓿鲜草产量较高,而干草产量较低,地下部分年生长量较高。通过回归分析,苜蓿地上生物量与土壤贮水量呈显著相关。生长第二年的苜蓿对土壤水分消耗大于天然植物,这主要表现在40厘米以下土壤水分上,而对40厘米以上土壤蒸发有明显的抑制作用,全生育期内,苜蓿地比天然草地多耗水70毫米,但当年由于降雨较多,土壤水分基本保持平衡。
The paper analysed mutual relationship between soil moisture and Alfalfa growth. The result shows that biomass (fresh weight) of Alfalfa which lived for two years, was 713. 7kg/mu. The underground biomass in soill layer (0～50cm) was 490. 2kg/mu by annual yield. The biomass is closely related to soil moisture storage by linear equation. As a whole, Alfalfa was more than the natural plant community to soil moisture depletion. But it happens under 40 cm soil layer. As against precipitation, the soil moisture of Alflfa meadow could balance in the growing stage.
出处
《中国草地》
CSCD
1990年第6期32-36,共5页
Grassland of China
