摘要
水分是干旱区植物生长的限制因子,以生态适宜性理论为基础,根据科尔沁沙地植被生态型及典型样带调查试验资料,系统分析了植物生态型与地下水位埋深及土壤含水率的定量关系。分析表明：湿生、中生、中旱生和旱生植物地下水位埋深的变化范围分别为0.45-1.66m、0.95-2.20m、2.20-4.59m和3.45-7.45m;植物根系土壤表层含水率的变化范围分别为2.70%-25.54%、0.80%-13.32%、0.41%-2.25%和0.28%-0.44%;植物根系层含水率的变化范围分别为5.59%~54.80%、3.59%-9.19%、0.71%-3.59%和0.16%-0.78%。同时湿生植物与中生植物、中旱生植物与旱生植物有一个地下水位埋深过渡范围,其值分别为0.95-1.66m和3.4-4.59m;有一个植物根系土壤表层含水率过渡范围,其值分别为2.70%-13.32%和0.41%-0.44%;有一个根系层土壤含水率过渡范围,其值分别为5.59%~9.19%和0.71%-0.78%。
Water is a major limit factor for plant growth in arid area. Based on the ecological fitting theory, the thesis systematically analyzed the quantitative relationship between plant ecotype and groundwater depth as well as soil water content, according to the test data in sample area and the plant ecotypes in Horqin sandy land. Following results have been got： for plants of hygrophytes, mesophytes, mesoxerophytes and xerophytes, the changing range of groundwater depth is respectively 0. 45 - 1.66 m, 0.95 - 2.20 m, 2. 20- 4.59 m, and 3.45-7. 45 m; the range of surface soil water content of roots layer is respectively 2.70% 25.54%, 0.80%-13.32%, 0. 41%-2. 25% and 0.28% -0.44% ; and the range of soil water content of roots layer is respectively 5.59% -54.80%, 3.59% -9.19%, 0.71% -3.59% and 0.16% -0.78%. Even though, some transition ranges still exist between hygrophytes and mesophytes, also between mesoxerophytes and xerophytes; the transition range of groundwater depth is respectively 0.95- 1.66 m and 3.45 -4.59 m, that of surface soil water content in roots layer is respectively 2.70% - 13.32% and 0.41%- 0. 44 %, and that of soil water content of roots layer is respectively 5.59 % -9.19 % and 0. 71% -0.78 %.
出处
《中国沙漠》
CSCD
北大核心
2007年第3期391-396,共6页
Journal of Desert Research
基金
国家自然科学基金项目(50569001)
内蒙古"十五"重点科技攻关项目(20020706)资助
