摘要
通过在甘肃民勤荒漠绿洲外围设固定样方连年观测 ,结合小区域地下水位动态监测和气象观测数据 ,定量研究了降水和地下水位变化对白刺群落消长的影响 .结果表明 ,以地下水位逐年下降为主要驱动因素的绿洲外围的环境旱化 ,促使优势种白刺群落的发育适应环境 ,更具旱生性 .在民勤绿洲外围 ,地下水位下降在近期内不是白刺生长的限制因素 ,在该区白刺将能较长时间生存 ,并发挥其优良的固沙、阻沙作用 .民勤绿洲外围地区约110mm年降水量对白刺群落的扩展没有明显的促进作用 ,但能维持白刺的正常生长发育 ,只有当连续两年降水量年均超过 14 0mm时 ,降水对白刺生长发育才有明显的促进作用 .
Based on the data from underground water monitoring,meteorological measuring and fixed sample square investigating in successive years at the edge of the oasis in Minqin,Gansu,the impact of precipitation and underground water on the growth and decline of Nitraria tangutorum community was studied.The result showed that the desiccated environment in oases driven by the decline of underground water level was favorable for the growth and develoment of N.tangutorum community,and made this species more xerophilous.This declining underground water level was not a limiting factor for N.tangutorum growth in late years.These N.tangutorum dominated communities were predicted to survive comparatively longer,and to function as sand fixer and wind breaker at oasis edge in Minqin.When average annual precipitation was about 110mm, N.tangutorum would maintain its normal growth,but the community couldn't spread freely.Only when the annual precipitation was up 140mm in two years running,could its growth be improved.
出处
《应用生态学报》
CAS
CSCD
2000年第6期923-926,共4页
Chinese Journal of Applied Ecology
基金
国家"九五"科技攻关项目!(96 0 1 7 0 1 0 1 )
关键词
白刺群落
消长
降水
地下水位
Growth and decline on Nitraria community, Precipitation, Underground water level.
