摘要
根据定位观测数据,对雷州半岛浅海沉积物发育的桉林地砖红壤水分状况及其动态变化进行了初步探讨.结果表明,受水分蒸发量大等因素的影响,0～100 cm土层月均贮水量较低;主要受降雨分布的影响,土壤水分呈明显的季节性变化特征且季节性干旱时间较长,8～9月土壤贮水量最高,3月土壤贮水量最低;土壤水分在短期内可出现较大幅度的变化,表明土壤容易产生干旱;土壤水分的垂直梯度变化表现为增长型,在旱季的1～3月,表层(0～60 cm土层)土壤水分变化较大,反映出水分蒸散作用对表层土壤含水量的影响较大;在雨季的7～8月土壤剖面水分变化较小,表明降雨土壤含水量的影响较大.如何减少干旱威胁,是桉树生产必须解决的重要课题.
Based on the data of observation in fixed location, the primarily study on moisture dynamic variation characteristics oflatosol under eucalyplus in Leizhou Peninsula has been done. It was showed that, the stored water content in 0~l00cm soil layerwas lower; being controlled by rainfa1l distribution, the stored water presented clear annual and seasonable changes, the highestcontent of stored water being appeared in August and September, the lowest one being appeared in March. It was found that even inrain season, very wide range in change of the stored water content in a short time could bring out, which means that the latosol undereucalyplu soil is quite easy to suffer from drought. The vertical changes of stored water content in latosol under eucalyplus showedrising with the depth increase. In dry season, the vertical changes of stored water content in 0~60 cm surface soil layer was muchmore greatly, which reflects the more effect of upward evaportranspiration of soil moisture, white in rain season, the range of verticalchanges in stored water was quite small, which reflects the predominate effect of rainfall infiltration.
出处
《土壤与环境》
CSCD
2001年第4期282-284,共3页
Soil and Environmental Sciences
基金
广东省自然科学基金项目(980006
000188)
广东省重大专项(A206
20010258C)
广东省农业环境综合治理重点实验室项目
关键词
雷州半岛
桉林-砖红壤
水分
动态变化
桉树林
Leizhou Peninsu1a
latosol under eucalyplus
stored water
dynamic variation
