丘陵区玉米农田水分响应指标的筛选及其相关性研究

Study on correlative character and filtration of response indexes to water in maize farmland at hill region

在水分胁迫及其复水条件下,分别测定代表不同土层厚度的18个丘陵区农田的土壤、植株、群体水分参数,采用系统聚类方法分析农田尺度的土壤-作物-大气连续体的关系,研究水分胁迫与胁迫后复水的响应差异,并通过主成分分析筛选出茎流强度、土壤含水量、伤流、冠气温差作为综合反映农田水分响应的诊断指标。

Water parameters of soil and plant and coronet of farmland on 18 hill region were mensurated partly in water stress or rewaterring. The method of hieraehieal duster analyze soil-plant-atmosphere eontinuum（SPAC） in scale of farmland,and research response difference of water stress and rewaterring.The result indicated that relationship degree of SPAC is larger on response indexes to water stress than that to rewater. Therefore, SPAC connection of farmland ecology is more compactness on water deficit. Major composition analysis screen out several relevant response indexes to water.The result indicated that the indexes of stem sap intensity and soil humidity and bleeding sap and coronet relative humidity and difference in temperature of coronet and atmosphere can estimate whole response to water of SPAC in farmland.