天然荒漠植物干旱期根区土壤贮水量的确定

在土壤-植物-大气连续统中,植物根区土壤贮水量是一个重要水源。对植物根区贮水量的研究是对该连续统研究的一个重要内容。准确估计植物根区土壤贮水量将为估计灌溉水量、生态需水量及环境的可持续发展提供科学的依据。特别是在中国干旱内陆河下游地区,由于水量减少造成植物根区贮水量减少而产生植物死亡．由此引起一系列生态环境问题。本文基于在一定边界条件下Richard方程的解,利用地表测值(0～10cm土层容积含水量——遥感方法可确定的值)及根系分布密度来确定黑河下游地区天然荒漠植物根区土壤贮水量,从而证明了利用遥感方法可以确定中国荒漠天然植物根区土壤贮水量。为今后从面上确定根区贮水量提供了科学基础。

Determination of Natural Desert Plant Root-Zone Soil Water Storage in Drying Periods

In soil-plant-atmosphere continuum,plant root-zone water storage is an important water source.The study on plant root-zone water storage is an important part in studying the continuum.The accurate estimation of the plant root-zone water stor- age will provide scientific basis for estimating irrigated water amount,ecological water-need amount and for the regional sustainable development in arid inland river basins of China.In the lower reaches of arid inland river basins of China,because of water recharge reducing,the water storage in plant root-zone reduced and plants withered,which have resulted in a series of ecological and environmental problems.So,it is imperative to study how to estimate plant root-zone water storage.Based on the solution of the weN-known Riehard's equation under certain boundary conditions,the natural plant root-zone water storage can be determined with the soil moisture of the surface layers 0-10cm and 0-20cm obtained by remote-sensing method in desert areas of China,and therefore,the feasibility study on determining natural plant root-zone soil water storage by using remote-sensing data in the West- ern China can be done.