滩地不同植被类型小气候日动态特征研究

采用定位观测的方法,以河滩地为对照,对湖北黄州李家洲林场内4种典型抑螺防病林的气温、土温、空气湿度、光照强度的日变化动态以及表层(0～5 cm土层)土壤含水量特征进行了监测.结果表明:由河滩地到农林群落的建立,与对照比较,林分内气温、土壤温度和光照强度均明显降低,日变幅变小.其中,日均气温降低2.75℃,日较差值降低3.20℃;除已收割农作物的林分,地表土壤温度降幅大于深层土壤,两个层次日均土壤温度降低1.01℃;林分内空气相对湿度明显升高,变幅减小,日均值升高12.74℃;林龄越大,林农间种格局的林分内表层土壤含水量越低.随着农林复合生态系统的建立,林内小气候环境朝着更为阴、凉、湿的方向变化,且波动性减弱,稳定性增强.

Research on Diurnal Dynamics Characteristic of Microclimate Under Different Vegetation in Beach

By using the targeted observing method,comparing with flood plain,the authors monitor the diurnal dynamics of air temperature,soil temperature,air humidity,light intensity and the surface soil moisture content(0-5cm) in four kinds of typical snail control and schistosomiasis prevention forests which are in Lijiazhou Hubei province.The results show that;comparing with control,the air temperature,soil temperature and light intensity of flood plain,agriculture and forest community significantly lower;the daily average temperature decreases 2.75 ℃ ,amplitude of diurnal variation decreases 3.20 ℃ ,the range of temperature decreasing in surface soil is wider than the deep soil,the daily average temperature of surface soil and deep soil both decrease 1.01 ℃ except the forest in which the farm crop is reaped;the relative humidity in the forest significantly increases and the range of humidity's changing decreases,and the daily average temperature increases 12.74 ℃:the older of the stand,the lower of the surface soil moisture content in the condition of agroforestry.With the establishment of agroforestry ecosystem,the forest microclimate will become cooler and wetter,and also its stability will be enhanced.