A nine years’experiment has been carried on to study the dynamic changes of soilmoisture in artificial grasslands.The seasonal changes of soil moisttire cai1 be explained bythree period in the year.With the growth of grasses year by year,the soil moisture contentgradually drops and is difficult to restore. So the grasses absorb deeper bayer water.soilloss of aritificial grassland can be effectively immitated by mathematical model.
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