民勤绿洲边缘固沙灌木林地土壤水分时空动态研究  

Temporal and Spatial Variation of Soil Moisture in Typical Sand-fixation Shrub at Minqin Oasis Fringe

作　　者：孙学兵[1] 姜生秀[1] 赵鹏[1] SUN Xue-bing;JIANG Sheng-xiu;ZHAO Peng(State Key Laboratory Breeding Base of Desertification and Aeolian Sand Disaster Combating,Gansu Desert Control Research Institute,Lanzhou,Gansu 730070)

机构地区：[1]甘肃省治沙研究所,甘肃省荒漠化与风沙灾害防治国家重点实验室(培育基地),兰州730070

出　　处：《陕西林业科技》2022年第6期6-11,16,共7页Shaanxi Forest Science and Technology

基　　金：2022年陇原青年创新创业人才项目(2022LQGR21);省青年科技基金计划(20JR5RA091)。

摘　　要：为给民勤绿洲边缘植被恢复重建及其树种选择提供可靠依据,以梭梭、柽柳、白刺、柽柳+沙拐枣、柽柳+白刺等5种流动沙地、平沙地主要灌木林地为对象,对影响民勤县植被建设成效和植被生长状况的最关键因子——土壤含水量即主要类型灌木林地不同季节土壤水分动态进行了研究,结果为(1)不同类型灌木林地土壤含水量月变化趋势基本一致,5月含水量较低,6月升高,7月下降,8月和9月恢复,10月趋于稳定;(2)土壤含水量垂直分布总体特点是表层土壤含水量最低,随着土层深度的增加呈现先增加后减小最后趋于稳定的趋势;(3)生长季初,各群落每个土层含水量相差不大,生长期流动沙地土壤水分状况明显优于各植物群落,柽柳+白刺群落120~180 cm土层含水量高于其它群落,梭梭每土层的含水量均最低,生长季末,柽柳+白刺群落40~140 cm土层内含水量高于其它群落,140~180 cm土层内,柽柳+沙拐枣含水量高。不同类型灌木林地土壤水分含量存在时空差异。By studying the dynamics of soil moisture in different vegetation types at the edge of Minqin oasis in different seasons,the soil moisture of different vegetation——sacsaoul,tamarisk,nitraria,tamarisk+sand jujube,tamarisk+nitraria,was measured systematically from May to October by means of location sampling and drying.The results showed that(1)the monthly change of soil water content in every plots were basically consistent,low in May,up in June,down in July,recovered in August and September,and stable in October;(2)the general vertical distribution of water content was very low in the layer of surface soil,increased and then decreased with soil layer deeper and began to stabilize finally with the increment of the depth of soil layer;(3)in early growing season,the soil water content of each layer for each vegetation community has little difference.In vegetation period,the water content of the shifting sand dune was clearly better than that of vegetation communities.The water content within 120~180 cm of the soil with tamarix+nitraria community was higher than other communities,whereas the water content in each soil layer with sacsaoul(Haloxylon ammodendron)was the lowest.At the end of growing season,the water content in 40~140 cm of soil with tamarix+nitraria community was higher than that of other communities.The water content of the tamarix+sand jujube community was the highest within 140~180 cm.The temporal and spatial differences of water content in different soil mechanical composition and land cover are explained.

关 键 词：绿洲边缘 灌木林地 土壤水分 时空变化 民勤县 沙地 

分 类 号：S728.4[农业科学—林木遗传育种]