果园百喜草覆盖与敷盖对小气候的影响

实测分析了果园覆盖与敷盖百喜草的光照、风速、温度、相对湿度时空变化规律。冬季中午1200时桃园比桔园光照强2倍左右，1400时风速大3～4倍，夏季地面最高温度行间裸地比行间百喜草高20.0℃，株间裸地比敷草高10.0℃；冬季桔园覆盖百喜草比裸地高2.4℃，比桃园高1.1℃，夏季降温效应、冬季保温效应非常明显。桔园透光率随高度的变化呈指数关系，株间风速与株高的关系近似于二次曲线，裸地气温随高度升高而降低，百喜草和敷盖地则相反，相对湿度早晚小，中午大，夏季大于冬季；不同处理的相对湿度随高度的分布其增大、减小相间出现。

Effect of the mulching of paspalum notatum flugge on the microclimate in orchard

The time and space regular changes of light intensity,wind speed,temperature,re lative humidity with the mulching of paspalum notatum flugge in orch ard are analysed.Light in peach orchard is twice more than citrus orchard at noo n in winter.The wind speed is three or four times more at fourteen in winter.The highest surface temperature with mulch is 20.0℃ lower than uncovered soil in r ow interval,10.0℃ lower in plants interval.The temperature with mulch in winter is 2.4℃ higher than uncovered soil in citrus orchard,1.1℃ higher in peach orcha rd.The effect of temperature descend in summer and the effect of temperature kee ping is very manifest.The photic ratio in citrus orchard changed with height is the relation of exponent,and the wind speed changed with the shoot height is the rel ation of second curve.Temperature in uncovered soil descends with the ascent of hight,but the soil temperature with mulch has the opposite result.However,the re lative humidity is low in morning and evening,and high at noon,the relative hu mid ity in summer is higher than in winter.The relative humidity in different treatm ents ascends sometimes or descends sometimes with the change of height.