辽西北缓坡地杨树沙棘混交林地土壤水分变化规律研究

Study on Regularity of Soil Moisture of Poplar Mixture Seabuckthorn in Gentle Slope of North-West Liaoning

借助辽西北缓坡地杨树沙棘混交林及杨树纯林的土壤含水量调查测试资料 ,经系统分析和总结 ,对 18～ 2 1a生杨树沙棘混交林及相同立地条件杨树纯林土壤水分动态变化规律进行了定量研究。结果表明 :林木根系微弱利用层土壤水分变化剧烈 ,混交林地土壤含水量高于纯林 ;而在林木根系利用层 ,纯林土壤含水量高于混交林 (雨后相反 )。杨沙混交林提高了自然降水利用率。年生长季中混交林地土壤含水量与降水量间相关关系十分显著。混交林地土壤水分的季节变化可分为 3个时期 :亏缺期、积累期和消退期。

The aid of the date of soil moisture in poplar mixture seabuckthorn and poplar stands in gentle of North-West liaoning, systematically analyzing and summarizing the soil moisture of 18～21 age poplar mixture seabuckthorn and poplar stands were studied. The experimental result showed that: the soil moisture of mixture tree roots faint use change severely, the soil moisture of mixture is bigger than poplar; at layer of roots use, the soil moisture of poplar is bigger than mixture. In the annual growth season, the soil moisture of mixture woodlands has markable correlation with the precipitation. The seasonal variation of soil moisture under the mixture woodlands may be divided into three periods: deficient period, accumulative period and lessen period.