黄土丘陵风沙区柽柳(Tamarix chinensis)林土壤水储量动态  

Soil Water Reserves Changes in Loess Hilly-gully Region

作　　者：程一本 肖洪浪[1] 李双[1,2] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所内陆河流域生态水文重点实验室,甘肃兰州730000 [2]中国科学院大学,北京100049

出　　处：《中国沙漠》2015年第2期407-413,共7页Journal of Desert Research

基　　金：国家自然科学基金重点项目(91125025);国家科技支撑计划项目(2011BAC07B05)

摘　　要：对甘肃景泰不同种植密度的10年龄人工柽柳(Tamarix chinensis)林地,监测根周及行间土壤水分含量,并对监测资料进行量化分析。结果表明:(1)在垂直剖面上,根周土壤水分含量层次可分为蒸发层0~40cm、活跃层40~180cm和相对稳定层180~200cm;行间土壤水分含量层次可分为蒸发层0~40cm、活跃层40~120cm、相对稳定层120~200cm。(2)林地土壤水分主要靠天然降水补充,土壤水分储量年际变化随种植密度由高到低呈亏空-富余-亏空的变化趋势;综合考虑行距-土壤水分储量回归方程及冠积-行距回归方程,得出景泰地区合理种植密度为1 923株·hm-2。结果可为干旱区生态恢复和退耕还林提供科学依据。Tamarix chinensis has astrong tolerance to the drought stress,salt stress,wind erosion stress,and it is widely distributed in arid-desert areas of northwest China for ecological restoration.We studied a 10-yearsold cultivated T.chinensis community with different planting density,and monitored the soil moisture around the root.From the quantitative study,soil moisture near the root could be divided into 3 groups:evaporated layer(0-40 cm),active layer(40-180 cm),stable layer(180-220 cm).And the classification changed in the planting space,as evaporated layer(0-40 cm),active layer(40-120 cm),stable layer(120-200 cm).Besides,along with the planting density'increasing,the inter-annual of soil water storage will change in shape of a parabola.Our results suggested that the appropriate planting space for the studied region could be 1 923 plants per hectare.

关 键 词：柽柳(Tamarix chinensis) 黄土丘陵 种植密度 土壤水分储量 

分 类 号：S714.2[农业科学—林学]