葡萄根系层土壤含水率与冠气温差的相关性研究

于2015—2017年在新疆维吾尔自治区葡萄瓜果试验区采用自动气象站观测葡萄各主要生长阶段晴天的冠层温度及气象数据,同时结合0~100 cm的土壤含水率(SW),分析葡萄冠气温差(△T)与环境因子的关系。结果表明:晴朗天气条件下14:00的△T与20~40 cm的SW有较明显的负相关性,在新梢生长期(4月23日至5月29日)、果实膨大期(5月30日至7月10日)、成熟期(7月10日至8月30日)的相关系数分别为-0.87、-0.86、-0.85(P0.01),并且利用2017年的实测数据进行验证,实测值(Y)与模拟值(X)具有很好的相关性,相关系数分别为-0.937、-0.860、-0.899(P0.01),因此可以确定葡萄的根系层主要分布在20~40 cm土层处,并且利用晴天日内14:00测得的△T预测葡萄园土壤水分的方法是可行的。

The Correlation between Canopy Leaf-air Temperature Difference and Soil Moisture Content in Different Growth Stages of Grape

In the experimental area of the Xinjiang Uygur Autonomous Region Institute of grape and melon research in 2015-2017,the canopy temperature data in the main growth stage of grape was observed by automatic weather station observation.The meteorological data obtained by synchronous observation and the soil water content (SW) of 0-100 cm were studied.The variation of canopy leaf-air temperature difference (△ T) of grape and its relationship with environmental factors were analyzed.The results showed that the canopy-air temperature difference (AT)between 14:00 in sunny weather was significantly negatively correlated with the soil moisture content (SW) at the depth of 20-40 cm.The correlation coefficient R of the shoot growth period,fruit enlargement period and mature period were-0.87,-0.86 and-0.85,and verified by the measured data of 2017,the measured value (Y) had a good correlation with the simulated value (X),and R were-0.937,-0.860 and -0.899,respectively.Therefore,it can be determined that the root layer of grape was mainly distributed in 20-40 cm soil layer,and the method of predicting the soil moisture in the vineyard by using the canopy-air temperature difference(△ T)measured at sunny day from 14:00 is feasible.